engLefèvre, TBraun, HCorsini, RGasior, MVelasco, MWood, MBeam Loss Monitoring on the CLIC Test Facility 3Accelerators and Storage RingsCERN-AB-2004-092CLIC-Note-611With its 4kW average beam power, the CLIC test facility 3 (CTF3) is a machine where the control of beam losses is an important issue. Beam losses must be monitored all along the linac in order to keep the radiation level and the activation as low as possible. The Beam Loss Monitor (BLM) system currently under development is described. The goal of our effort is to provide quantitative beam loss measurements. An intensive simulation work has been carried out in order to estimate the e+ - e- showers in a realistic accelerator environment. Based on these results, we investigate two scenarios to measure beam losses using a set of 48 detectors distributed along the machine.2004-08-17http://cds.cern.ch/record/793456http://cds.cern.ch/record/793456oai:cds.cern.ch:793456revised version submitted on 2004-09-28 16:57:02 engLefèvre, TBraun, HBravin, EnricoCorsini, RPerrot, Anne LaureSchulte, DanielBeam HALO Monitoring at CTF3Accelerators and Storage RingsCERN-AB-2004-091CLIC-Note-610In high intensity accelerators, the knowledge of the beam halo distribution and its generation mechanisms are important issues. In order to study these phenomena, dedicated beam diagnostics must be foreseen. In circular machines, beam halo is monitored by using scrapers and beam loss detectors. In the framework of the CLIC project, a beam halo monitor is currently under development. The proposed device is based on an imaging system and a masking technique, which suppresses the core of the beam to allow direct observation of the halo. A first test was performed on the CLIC Test Facility 3 in 2003. We discuss the performances and the limitations of this technique pointing out our plans for future developments.2004-08-17http://cds.cern.ch/record/793770http://cds.cern.ch/record/793770oai:cds.cern.ch:793770revised version submitted on 2004-09-28 11:33:38 engGasior, MLimiting High Frequency Longitudinal Impedance of an Inductive Pick-Up by a Thin Metallic LayerAccelerators and Storage RingsCERN-AB-2004-090CLIC-Note-609An Inductive Pick-Up (IPU) [1] was developed to measure the position and current of an electron beam of the Third CLIC Test Facility (CTF3) Drive Beam Linac [2]. The pick-up construction is similar to a wall current monitor, but the pick-up inner wall is divided into 8 electrodes, each of which forms the primary winding of a toroidal transformer. The beam image current component flowing along each electrode is transformed to a secondary winding, connected to an output. The continuity of the vacuum chamber is taken care of by a ceramic insertion surrounded by the electrodes. The insertion is titanium coated on the inside and the end-to-end resistance of the layer is chosen in such a way that within the IPU bandwidth the image current flows over the electrodes. For higher frequencies the current is conducted by the coating to limit the longitudinal impedance of the device in the GHz range. This paper describes a simple electric network model, which was used to simulate the influence of the coating and to optimize its resistance. The model is built from sections of ideal transmission lines and resistors and is suitable for SPICE simulations. Results of measurements and simulations are compared.2004-08-17http://cds.cern.ch/record/793769http://cds.cern.ch/record/793769oai:cds.cern.ch:793769revised version submitted on 2004-09-28 17:01:55 engBosser, JacquesGnanvo, KSpanggaard, JTranquille, GNew Beam Profile Monitor Based on GEM Detector for the AD Transfer and Experimental LinesAccelerators and Storage RingsCERN-AB-2004-089Many multi-wire proportional chambers, (MWPC’s), are installed on the CERN Antiproton Decelerator (AD) transfer and experimental lines. They are used for the steering and profile measurement of the low energy antiproton beam that is extracted at the energy of 5.3 MeV from the AD machine. At this very low energy the standard MWPC’s are not only destructive for the beam but also perturb strongly the 2D profile measurement. These chambers are also based on technology that is outdated and in recent years have shown to be fragile and expensive to repair. For these reasons a new profile monitor, based on a Gas Electron Multiplier (GEM) detector is under development as a possible replacement of the MWPC’s. This new profile monitor will enable high precision, true 2D profile measurements of the low energy antiproton beam. In this paper, we present the modification of the standard GEM detector required by our specific application and the first results of the profile monitor with antiproton beams.2004-08-17http://cds.cern.ch/record/793453http://cds.cern.ch/record/793453oai:cds.cern.ch:793453revised version submitted on 2004-09-28 17:14:21 engFischer, CDehning, BerndKoopman, JKramer, DanielRoncarolo, FComparative Transverse Distribution Measurements between the New SPS Rest Gas Ionisation Monitor and the Wire Scanner MonitorsAccelerators and Storage RingsCERN-AB-2004-088During the past two years, a new Ionization Profile Monitor was installed and tested in the CERN SPS. In parallel modifications were made on various wire scanner monitors. The aim is to develop instruments performing reliable measurements of transverse beam distributions in the SPS and in the LHC, in order to control the stringent emittance preservation requirements. Measurements made with the two types of monitors were performed under various conditions of LHC type beams, ranging from a pilot bunch up to beams having in the SPS nominal distributions in bunch number, intensity and energy for injection into the LHC. The data provided by the two types of instruments are compared. In the case of discrepancies, an analysis of the possible reasons is made. The cures implemented and the improvements foreseen are discussed..2004-08-17http://cds.cern.ch/record/793449http://cds.cern.ch/record/793449oai:cds.cern.ch:793449revised version submitted on 2004-09-28 17:04:54 engUrschütz, PeterMeasurement and Compensation of Second and Third Order Resonances at the CERN PS BoosterAccelerators and Storage RingsCERN-AB-2004-087Space charge effects at injection are the most limiting factor for the production of high brightness beams in the CERN PS Booster. The beams for LHC, CNGS and ISOLDE feature incoherent tune spreads exceeding 0.5 at injection energy and thus cover a large area in the tune diagram. Consequently these beams experience the effects of transverse betatron resonances and efficient compensation is required. Several measurements have been performed at the PS Booster in 2003, aiming at a detailed analysis of all relevant second and third order resonances and an optimisation of the compensation schemes. Special attention was paid to the systematic 3Qv=16 resonance. To avoid this particularly dangerous resonance an alternative working point was tested. A comparison of resonance driving terms and compensation settings for both working points was made and important differences in the strengths of the resonances were found. The peculiarities when measuring third order coupling resonance driving terms are also mentioned.2004-07-17http://cds.cern.ch/record/793448http://cds.cern.ch/record/793448oai:cds.cern.ch:793448revised version submitted on 2004-09-28 16:59:42 engLindroos, MReview of the ISOL MethodAccelerators and Storage RingsCERN-AB-2004-086The ISOL technique was invented in Copenhagen over 50 years ago and eventually migrated to CERN where a suitable proton drive beam was available at the Syncho-Cyclotron. The quick spread of the technique from CERN to many other laboratories has resulted in a large user community, which has assured the continued development of the method, physics in the front-line of fundamental research and the application of the method to many applied sciences. The technique is today established as one of the main techniques for on-line isotope production of high intensity and high quality beams. The thick targets used allows the production of unmatched high intensity radioactive beams. The fact that the ions are produced at rest makes it ideally suitable for low energy experiments and for post acceleration using well established accelerator techniques. The many different versions of the technique will be discussed and the many facilities spread all over the world will be reviewed. The major developments at the existing facilities and the challenges encountered will be presented. Finally, the possibility of using the resulting high intensity beams for the production of intense neutrino beams will be briefly discussed.2004-08-17http://cds.cern.ch/record/793447http://cds.cern.ch/record/793447oai:cds.cern.ch:793447revised version submitted on 2004-09-28 17:19:32 engBenedikt, MichaelCarli, ChristianChanel, MSchmidt, FUrschütz, PeterBetatron Resonance Studies at the CERN PS Booster by Harmonic Analysis of Turn-by-turn Beam Position DataAccelerators and Storage RingsCERN-AB-2004-085High brightness and high intensity beams are required from the PS Booster for LHC, CNGS and ISOLDE operation. The large space charge tune spreads associated with these beams, especially at injection, require an optimised resonance compensation scheme to avoid beam blow-up and subsequent beam losses. For this a detailed knowledge on strength and phase of resonance driving terms is needed. A new measurement system has been installed to determine resonance driving terms from turn-by-turn beam position data using fast Fourier transform. The multi-turn acquisition system as well as the specic measurement conditions at the PS Booster are discussed. As an example, the measurement and compensation of the linear coupling resonance driving term is presented. Excellent agreement between measurement and simulation for resonance phase and strength was found.2004-08-17http://cds.cern.ch/record/793445http://cds.cern.ch/record/793445oai:cds.cern.ch:793445revised version submitted on 2004-09-28 11:29:14 engBenedikt, MichaelBase Line Design for a Beta/Beam Neutrino FacilityAccelerators and Storage RingsCERN-AB-2004-084The term beta-beam has been coined for the production of pure beams of electron neutrinos or their antiparticles through the decay of radioactive ions circulating in a storage ring. The neutrino source itself consists of a high-energy storage ring (gamma ~150), with long straight sections in line with the experiment(s). The radioactive ions (6He and 18Ne) will be produced in an ISOL type target system. Due to the short life times of around 1 s at rest, the beam needs to be accelerated as quickly as possible. For this a staged system of accelerators is proposed. The chain starts with a linac followed by a rapid cycling synchrotron for acceleration up to ~300 MeV/u. For further acceleration the existing PS and SPS machines are used. Finally, after acceleration to SPS top energy, the ions are transferred to a decay ring where they are merged with the existing bunches through a longitudinal stacking procedure. The baseline design of the beta-beam facility will be presented together with its major problems. Potential solutions to the latter will be discussed.2004-08-17http://cds.cern.ch/record/793444http://cds.cern.ch/record/793444oai:cds.cern.ch:793444revised version submitted on 2004-09-28 11:26:45 engArduini, GianluigiCarli, ChristianZimmermann, FrankLocalizing Impedance Sources from Betatron-phase Beating in the CERN SPSAccelerators and Storage RingsCERN-AB-2004-083Multi-turn beam-position data recorded after beam excitation can be used to extract the betatron-phase advance between adjacent beam position monitors (BPMs) by a harmonic analysis. Performing this treatment for different beam intensities yields the change in phase advance with current. A local impedance contributes to the average tune shift with current, but, more importantly, it also causes a mismatch and phase beating. We describe an attempt to determine the localized impedance around the SPS ring by fitting the measured betatron phase shift with current at all BPMs to the expected impedance response matrix.2004-08-17http://cds.cern.ch/record/793443http://cds.cern.ch/record/793443oai:cds.cern.ch:793443revised version submitted on 2004-09-28 15:45:53 engArduini, GianluigiBaglin, VBohl, TJenninger, BJiménez, MLaurent, Jean MichelSchulte, DanielRuggiero, FZimmermann, FrankElectron-Cloud Build-Up Simulations and Experiments at CERNAccelerators and Storage RingsCERN-AB-2004-082We benchmark the predictions of electron-cloud buildup simulations against measurements at the CERN SPS. Specifically we compare the electron flux at the wall, electron-energy spectra, heat loads and the spatial distribution of the electrons for two different bunch spacings, with variable magnetic fields, and for several chamber temperatures and associated surface conditions. The simulations employ a modified, improved version of the ECLOUD code. The main changes are briefly described. We finally present updated simulation results for the heat load in the cold LHC arcs.2004-08-17http://cds.cern.ch/record/793442http://cds.cern.ch/record/793442oai:cds.cern.ch:793442revised version submitted on 2004-09-28 15:42:37 engZimmermann, FrankBeam Dynamics Challenges for Future Circular CollidersAccelerators and Storage RingsCERN-AB-2004-081CARE-Conf-04-033-HHHCARE-Conf-2004-033-HHHThe luminosity of hadron colliders rises with the beam intensity, until some limit is encountered, mostly due to head-on and long-range beam-beam interaction, due to electron cloud, or due to conventional impedance sources. Also beam losses caused by various mechanisms may affect the performance. The limitations can be alleviated, if not overcome, by a proper choice of beam parameters and by dedicated compensation schemes. Examples include alternating crossing at several interaction points, electromagnetic wires, super-bunches, electron lenses, clearing electrodes, and nonlinear collimation. I discuss such mitigating measures and related research efforts, with special emphasis on the LHC and its upgrade.2004-08-17http://cds.cern.ch/record/793441http://cds.cern.ch/record/793441oai:cds.cern.ch:793441revised version submitted on 2004-09-28 15:29:18 engBenedetto, ElenaRuggiero, FSchulte, DanielZimmermann, FrankBlaskiewicz, MWang, LBellodi, GRumolo, GiovanniOhmi, KWin, S SFurman, MCai, YPivi, MDecyk, VMori, WGhalam, A FKatsouleas, T CReview and Comparison of Simulation Codes Modeling Electron-Cloud Build Up and InstabilitiesAccelerators and Storage RingsCERN-AB-2004-080CARE-Conf-04-006-HHHCARE-Conf-2004-006-HHHSeveral computer codes written at various laboratories are employed for modeling the generation and the consequences of an electron cloud. We review several of these programs, which simulate either the build up of an electron cloud or the instabilities it produces, and we compare simulation results for identical, or similar, input parameters.2004-08-17http://cds.cern.ch/record/793440http://cds.cern.ch/record/793440oai:cds.cern.ch:793440revised version submitted on 2004-10-04 16:28:42 engSchulte, DanielZimmermann, FrankQCD Explorer Based on LHC and CLIC-1Accelerators and Storage RingsCERN-AB-2004-079CLIC-Note-608CERN-LHeC-Note-2005-003 ACCColliding 7-TeV LHC super-bunches with 75-GeV CLIC bunch trains can provide electron-proton collisions at very high centre-of-mass energies, opening up a new window into QCD. At the same time, this QCD explorer would employ several key components required for both an LHC upgrade and CLIC. We here present a possible parameter set of such a machine, study the consequences of the collision for both beams, and estimate the attainable luminosity.2004-08-17http://cds.cern.ch/record/793439http://cds.cern.ch/record/793439oai:cds.cern.ch:793439revised version submitted on 2004-09-28 15:40:17 engWittmer, WZimmermann, FrankPilat, FPtitsyn, VVan Zeijts, JAdjusting the IP $\beta$ Functions in RHICAccelerators and Storage RingsCERN-AB-2004-078The beta functions at the IP can be adjusted without perturbation of other optics functions via several approaches. In this paper we describe a scheme based on a vector knob, which assigns fixed values to the different tuning quadrupoles and scales them by a common multiplier. The values for the knob vector were calculated for a lattice without any errors using MADX. Previous studies for the LHC [1] have shown that this approach can meet the design goals. A specific feature of the RHIC lattice is the nested power supply system. To cope with the resulting problems a detailed response matrix analysis has been carried out and different sets of knobs were calculated and compared. The knobs were tested at RHIC during the 2004 run and preliminary results are discussed. Simultaneously a new approach to measure the beam sizes of both colliding beams at the IP, based on the tunability provided by the knobs, was developed and tested.2004-08-17http://cds.cern.ch/record/793437http://cds.cern.ch/record/793437oai:cds.cern.ch:793437revised version submitted on 2004-09-29 09:21:37 doi:10.1103/PhysRevSTAB.8.102801engVogel, EBohl, TWehrle, URF Amplitude Modulation to Suppress Longitudinal Coupled Bunch Instabilities in the SPSAccelerators and Storage RingsCERN-AB-2004-077Without specific counter measures, the LHC type beam in the SPS suffers from longitudinal coupled bunch instabilities. To get rid of them, the SPS impedance has been decreased in the last years and the operation of a high frequency Landau damping system has been established. In case of the absence of this Landau damping system one may alternatively introduce an RF amplitude modulation to stabilize the beam. We present results obtained by this method in the SPS and considerations for a potential increase of the longitudinal stability of the LHC.2004-08-17http://cds.cern.ch/record/79343610.1103/PhysRevSTAB.8.102801http://cds.cern.ch/record/793436oai:cds.cern.ch:793436revised version submitted on 2004-09-28 14:48:37 engVogel, EHöfle, WolfgangSimulation of Transient Beam-Feedback Interaction and Application to Extraction of CNGS Beam from the SPSAccelerators and Storage RingsCERN-AB-2004-076For present and future high energy proton accelerators, such as the LHC, transverse feedback systems play an essential role in supplying the physics experiments with high intensity beams at low emittances. We developed a simulation model to study the interaction between beam and transverse feedback system in detail, bunch-by-bunch and turn-by-turn, considering the real technical implementation of the latter. A numerical model is used as the non linear behaviour (saturation) and limited bandwidth of the feedback system, as well as the transient nature at injection and extraction, complicates the analysis. The model is applied to the practical case of the CNGS beam in the SPS accelerator. This beam will be ejected from the SPS in two batches causing residual oscillations by kicker ripples on the second batch. This second batch continues to circulate for 2167 turns after the first batch has been extracted and oscillations are planned to be damped by the feedback system. The model can be extended to examine transient effects at injection (LHC), and coupled bunch instability effects can be included.2004-08-17http://cds.cern.ch/record/793435http://cds.cern.ch/record/793435oai:cds.cern.ch:793435revised version submitted on 2004-09-28 14:46:43 engScrivens, RProton and Ion Sources for High Intensity AcceleratorsAccelerators and Storage RingsCERN-AB-2004-075Future high intensity ion accelerators, including the Spallation Neutron Source (SNS), the European Spallation Source (ESS), the Superconducting Proton Linac (SPL) etc, will require high current and high duty factor sources for protons and negative hydrogen ions. In order to achieve these goals, a comparison of the Electron Cyclotron Resonance, radio-frequency and Penning ion sources, among others, will be made. For each of these source types, the present operational sources will be compared to the state-of-the-art research devices with special attention given to reliability and availability. Finally, the future research and development aims will be discussed.2004-08-17http://cds.cern.ch/record/793626http://cds.cern.ch/record/793626oai:cds.cern.ch:793626revised version submitted on 2004-09-28 14:27:38 engRedaelli, SAssmann, R WBöge, MCoosemans, WilliameDehler, MRivkin, LVibration Measurements at the Swiss Light Source (SLS)Accelerators and Storage RingsCERN-AB-2004-074CLIC-Note-606Vibration measurements have been carried out at the Swiss Light Source (SLS) site as part of a collaboration between the Paul Sherrer Institute (PSI) and the European Organization for Nuclear Research (CERN). The vibration level of the SLS floor and of some lattice elements of the SLS ring have been monitored under various experimental conditions. In particular, vibration spectra of lattice quadrupoles have been measured with a circulating beam and compared with the spectra of transverse beam positions, as measured with beampositionmonitors. This paper summarizes the results.2004-08-17http://cds.cern.ch/record/792690http://cds.cern.ch/record/792690oai:cds.cern.ch:792690revised version submitted on 2004-09-28 14:22:55 engCoosemans, WilliameRedealli, SIn-situ Vibration Measurements of the CTF2 QuadrupolesAccelerators and Storage RingsCERN-AB-2004-073CLIC-Note-607The Compact LInear Collider (CLIC), presently under study at the European Organization for Nuclear Research (CERN), aims at colliding high energy â€ﾜnanobeams” at a luminosity of 1035 cm-2s-1. Vibrations of the lattice elements, if not properly corrected, can result in a loss in performance by creating both unacceptable emittance growth in the linear accelerator and relative beam-beam offsets at the interaction point. Of particular concern are the vibrations induced by the accelerator environment. For example, the circulating water used to cool the lattice quadrupoles will increase magnet vibration levels. In the framework of the CLIC stability study, in-situ measurements of quadrupole vibrations have been performed at the CLIC Test Facility 2 (CTF2) with all accelerator equipment switched on. Since the CTF2 quadrupoles and their alignment support structures are realistic prototypes of those to be used in the CLIC linac, the measurements provide a realistic estimate of the CLIC magnet vibrations in a realistic accelerator working environment.2004-08-17http://cds.cern.ch/record/792688http://cds.cern.ch/record/792688oai:cds.cern.ch:792688revised version submitted on 2004-09-28 14:25:21 engMüller, A SBirkel, IHuttel, EPérez, FPont, MZimmermann, FrankStudies of Current Dependent Effects at ANKAAccelerators and Storage RingsCERN-AB-2004-072The ANKA electron storage ring is operated at energies between 0.5 and 2.5 GeV. A major requirement for a synchrotron light source, such as ANKA, is to achieve a high beam current. A multitude of mostly impedance related effects depend on either bunch or total beam current. This paper gives an overview over the various beam studies performed at ANKA in this context, specifically the observation of current dependent detuning, the determination of the bunch length change with current from a measurement of the ratio between coherent and incoherent synchrotron tune and an assessment of the effective longitudinal loss factor from the current dependent horizontal closed orbit distortion.2004-08-17http://cds.cern.ch/record/792687http://cds.cern.ch/record/792687oai:cds.cern.ch:792687revised version submitted on 2004-09-29 09:50:03 engMüller, A SBirkel, IHuttel, EPérez, FPont, MZimmermann, FrankInvestifation of Scraper Induced Wakefields at ANKAAccelerators and Storage RingsCERN-AB-2004-071The ANKA synchrotron light source operates in the energy range from 0.5 to 2.5 GeV. Typical requirements for light sources include small beam sizes, large lifetimes and high currents to provide the highest possible photon flux. The understanding of impedance and instability related issues is very important in order to improve the machine performance, in particular when small aperture insertion devices are installed that require protection by a scraper. In the framework of an impedance survey the transverse and longitudinal wake fields induced by a vertical scraper have been measured and analysed. This paper reports the beam observations and compares them with the expectation.2004http://cds.cern.ch/record/792686http://cds.cern.ch/record/792686oai:cds.cern.ch:792686revised version submitted on 2004-09-29 09:46:47 engMétral, EliasCarli, ChristianGiovannozzi, MassimoMartini, MSteerenberg, RFranchetti, GiulianoHofmann, IQiang, JRyne, Robert DIntensity Dependent Emittance Transfer Studies at the CERN Proton SynchrotronAccelerators and Storage RingsCERN-AB-2004-070An intensive study has been undertaken since the year 2002 to understand better the various high-intensity bottlenecks of the CERN Proton Synchrotron machine. One of these limitations comes from the so-called Montague resonance. High-intensity proton synchrotrons, having larger horizontal than vertical emittance, may suffer from this fourth-order coupling resonance driven by space charge only. In particular, such resonance may lead to emittance sharing and, possibly, beam loss due to vertical acceptance limitation. Experimental observations made in the 2002, 2003 and 2004 runs on the Montague resonance are presented and compared with theoretical predictions and 3D particle-in-cell simulation results.2004-08-17http://cds.cern.ch/record/792685http://cds.cern.ch/record/792685oai:cds.cern.ch:792685revised version submitted on 2004-09-28 14:20:11 engMartini, MPrior, C RHigh-Intensity and High-Density Charge-Exchange Injection Studies into the CERN PS Booster at Intermediate EnergiesAccelerators and Storage RingsCERN-AB-2004-069For the high brilliance LHC ultimate beam and the high intensity CNGS beam, single batch injections into the CERN Proton Synchrotron (PS) will be used to increase the overall machine intensity compared with the present double batch injections. Charge-exchange injection into the PS Booster with a new linac at intermediate energies is thus examined. A key parameter to consider is the energy dependence of beam incoherent tune shifts at injection. Increasing the linac energy from the present 50 MeV to 160 MeV should yield a safer tune shift. For each PS Booster ring, a charge-exchange injection scheme is envisaged inside a proper straight section, redesigned with new bends to make a local bump and using the existing fast bump magnets for horizontal phase-space painting. ACCSIM simulations for charge-exchange injection at 160 MeV have been investigated for both LHC and CNGS beams. After optimizing the parameters that are used for the space charge tracking routines, the results of the simulations agree well with expectations, signifying that the LHC ultimate and CNGS beams may be provided with single PS Booster batches within the required emittances. For assessment, simulation of injection at 50 MeV for the current LHC beam has been performed, yielding a fairly good agreement with measured performance. Concurrently, similar charge-exchange injection simulations have been carried out using an alternative programme developed at the Rutherford Appleton Laboratory.2004-08-17http://cds.cern.ch/record/791846http://cds.cern.ch/record/791846oai:cds.cern.ch:791846revised version submitted on 2004-09-28 12:10:46 engMétral, EliasRuggiero, FStability Diagrams for Landau Damping with Two-Dimensional Betatron Tune Spread from both Octupoles and Nonlinear Space Charge Applied to the LHC at InjectionAccelerators and Storage RingsCERN-AB-2004-067The joint effect of space-charge nonlinearities and octupole lenses is discussed for the case of a quasi-parabolic distribution function in the two transverse planes, considering a monochromatic beam and neglecting the longitudinal variation of the transverse space-charge forces. The self-consistent nonlinear space-charge tune shift corresponding to the above distribution function is first derived analytically. Noting that a reasonable approximation of the space-charge tune shift is given considering only linear terms in the betatron action variables, the dispersion relation is solved analytically in this approximate case. As expected, in the absence of external (octupolar) nonlinearities, the result of Möhl and Schönauer is recovered: there is no stability region. In the absence of space charge, the stability diagrams of Berg and Ruggiero are recovered. The new result is applied to the LHC at injection.2004-08-17http://cds.cern.ch/record/791844http://cds.cern.ch/record/791844oai:cds.cern.ch:791844revised version submitted on 2004-09-28 12:14:41 engKoschik, ACaspers, FriedhelmMétral, EliasVos, LZotter, Bruno WTransverse Resistive Wall Impedance and Wake Function with "Inductive Bypass"Accelerators and Storage RingsCERN-AB-2004-065A new physical regime is revealed by the LHC collimators. Small aperture paired with large wall thickness ask for a different physical picture of the resistive wall effect than the classical one. Two general formulae for multi-layer resistive-wall impedances recently derived are reviewed and compared in the particular case of an LHC collimator. The corresponding wake function, which is useful for the simulation of beam stability in the time domain, has been obtained.2004-08-17http://cds.cern.ch/record/791838http://cds.cern.ch/record/791838oai:cds.cern.ch:791838revised version submitted on 2004-09-28 12:07:30 engKoschik, ASimulation of Multi-Bunch Multi-Turn Instabilities in High Energy Proton Rings: Algorithms and ResultsAccelerators and Storage RingsCERN-AB-2004-064A simulation code to study collective effects in multibunch proton machines has been developed and applied to the CERN SPS and LHC. The 3D simulation program allows the exploration of long-range effects due to resistivewall and HOMs in circular, elliptic and rectangular vacuum chambers also for uneven filling schemes. The code has been benchmarked with measurements in the SPS. Preliminary beam stability results obtained for LHC are presented as well.2004-08-17http://cds.cern.ch/record/791563http://cds.cern.ch/record/791563oai:cds.cern.ch:791563revised version submitted on 2004-09-28 17:37:01 engKorostelev, M SWenninger, JZimmermann, FrankFlexibility, Tolerances, and Beam-Based Tuning of the CLIC Damping RingAccelerators and Storage RingsCERN-AB-2004-062CLIC-Note-605The present design of the CLIC damping ring can easily accommodate anticipated CLIC parameter changes. Realistic misalignments of magnets and monitors increase the equilibrium emittance. In simulations we study both the sensitivity to magnet displacements and the emittance recovery achieved by orbit correction, dispersion-free steering.2004-08-17http://cds.cern.ch/record/791556http://cds.cern.ch/record/791556oai:cds.cern.ch:791556revised version submitted on 2004-09-28 12:01:45 engKondrashev, SBalabaev, AKonukov, KSharkov, B YuShumshurov, A VCamut, OChamings, J AKugler, HScrivens, RCharushin, AMakarov, KSatov, YuSmakovskii, YuNew Developments of a Laser Ion Source for Ion SynchrotronsAccelerators and Storage RingsCERN-AB-2004-061Laser Ion Sources (LIS) are well suited to filling synchrotron rings with highly charged ions of almost any element in a single turn injection mode. We report the first measurements of the LIS output parameters for Pb27+ ions generated by the new 100 J/1 Hz Master Oscillator - Power Amplifier CO2-laser system. A new LIS has been designed, built and tested at CERN, as an ion source for ITEP-TWAC accelerator/accumulator facility, and as a possible future source for an upgrade of the Large Hadron Collider (LHC) injector chain. The use of the LIS based on 100 J/1 Hz CO2-laser together with the new ion LINAC, as injector for ITEP-TWAC project, is discussed..2004-08-17http://cds.cern.ch/record/791548http://cds.cern.ch/record/791548oai:cds.cern.ch:791548revised version submitted on 2004-09-28 11:59:10 engKeil, EberhardBergy, J SSessler, Andrew MElectron Model of an FFAG Muon AcceleratorAccelerators and Storage RingsCERN-AB-2004-060Parameters are derived for the lattice and RF system of an electron model of a non-scaling FFAG ring for accelerating muons. The model accelerates electrons from about 10 to about 20 MeV, and has about 15 m circumference. Magnet types and dimensions, spacing, half apertures, about 12 mm by 20 mm, and number of cells are presented. The tune variation with momentum covers several integers, similar to that in a full machine, and allows the study of resonance crossing. The consequences of misaligned magnets are studied by simulation. The variation of orbit length with momentum is less than 36 mm, and allows the study of acceleration outside a bucket. A 100 mm straight section, in each of the cells, is adequately long for an RF cavity operating at 3 GHz. Hamiltonian dynamics in longitudinal phase space close to transition is used to calculate the accelerating voltage needed. Acceleration is studied by simulation. Practical RF system design issues, e.g. RF power, and beam loading are estimated.2004-08-17http://cds.cern.ch/record/791380http://cds.cern.ch/record/791380oai:cds.cern.ch:791380revised version submitted on 2004-09-28 17:31:52 engGiovannozzi, MassimoScaramuzzi, PNonlinear Dynamics Studies at the CERN Proton Synchrotron: Precise Measurements of Islands Parameters for the Novel Multi-Turn ExtractionAccelerators and Storage RingsCERN-AB-2004-059Recently, a novel approach to perform multi-turn extraction from a circular accelerator was proposed. It is based on adiabatic capture of particles into islands of transverse phase space generated by nonlinear resonances. Sextupole and octupole magnets are used to generate these islands, while an appropriate slow variation of the linear tune allows particles to be trapped inside the islands. Intense experimental efforts showed that the approach is indeed performing rather well. However, good knowledge of the islands properties is a key ingredient for the success of this extraction type. In this paper, a series of measurements are presented dealing with the study of islands’ parameters for the fourth-order resonance, such as detuning with amplitude, fixed points’ position, betatron frequency inside the islands.2004-08-17http://cds.cern.ch/record/791377http://cds.cern.ch/record/791377oai:cds.cern.ch:791377revised version submitted on 2004-09-28 11:54:03 engCappi, RGilardoni, S SGiovannozzi, MassimoMartini, MMétral, EliasMüller, A SSakumi, ASteerenberg, RMultiturn Extraction Based on Trapping in Stable Islands at CERN PS: Recent Measurement AdvancesAccelerators and Storage RingsCERN-AB-2004-058Recently a novel approach to perform multi-turn extraction was proposed based on beam splitting in the transverse phase space by means of trapping inside stable islands. During the year 2002, preliminary measurements at the CERN Proton Synchrotron with a low-intensity, singlebunch, proton beam, confirmed the possibility of generating various beamlets starting from a single Gaussian beam. The experimental campaign continued also during the year 2003 to assess a number of key issues, such as the feasibility of trapping with high-intensity beam and capture efficiency. The experimental results are presented and discussed in detail in this paper.2004-08-17http://cds.cern.ch/record/791376http://cds.cern.ch/record/791376oai:cds.cern.ch:791376revised version submitted on 2004-09-28 11:51:26 engCorsini, RBernard, MBienvenu, GBraun, HCarron, GFerrari, AForstner, OGarvey, TerenceGeschonke, GüntherGroening, LJensen, EKoontz, RLefèvre, TMiller, RRinolfi, LouisRoux, RRuth, Ronald DSchulte, DanielTecker, F AThorndahl, LYeremian, A DFirst Full Beam Loading Operation with the CTF3 LinacAccelerators and Storage RingsCERN-AB-2004-057SLAC-PUB-10762CTF-3-NOTE-066CLIC-Note-604The aim of the CLIC (Compact Linear Collider) Study is to investigate the feasibility of a high luminosity, multi-TeV linear e+e- collider. CLIC is based on a two-beam method, in which a high current drive beam is decelerated to produce 30 GHz RF power needed for high-gradient acceleration of the main beam running parallel to it. To demonstrate the outstanding feasibility issues of the scheme a new CLIC Test Facility, CTF3, is being constructed at CERN by an international collaboration. In its final configuration CTF3 will consist of a 150 MeV drive beam linac followed by a 42 m long delay loop and an 84 m combiner ring. The installation will include a 30 GHz high power test stand, a representative CLIC module and a test decelerator. The first part of the linac was installed and commissioned with beam in 2003. The first issue addressed was the generation and acceleration of a high-current drive beam in the "full beam loading" condition where RF power is converted into beam power with an efficiency of more than 90 %. The full beam loading operation was successfully demonstrated with the nominal beam current of 3.5 A. A variety of beam measurements have been performed, showing good agreement with expectations.2004-08-17http://cds.cern.ch/record/791372http://cds.cern.ch/record/791372oai:cds.cern.ch:791372revised version submitted on 2004-09-28 11:48:55 engBurkhardt, HManglunki, DjangoMartini, MRoncarolo, FRumolo, GiovanniInvestigation of Space Charge Effects and Intrabeam Scattering for Lead Ions in the SPSAccelerators and Storage RingsCERN-AB-2004-056Space charge effects and intrabeam scattering usually play a minor role in high energy machines like the SPS. They can potentially become a limitation for the heavy ion beams needed for the LHC at the injection plateau in the SPS. Experimental studies on space charge limitations performed on low energy proton beams in the SPS will be described. Theoretical studies have been performed to predict emittance growth times due to intrabeam scattering using several different codes.2004-08-17http://cds.cern.ch/record/791371http://cds.cern.ch/record/791371oai:cds.cern.ch:791371revised version submitted on 2004-09-28 11:45:01 engArduini, GianluigiBenedetto, ElenaBurkhardt, HMétral, EliasRumolo, GiovanniObservation of a Fast Single-Bunch Transverse Instability on Protons in the SPSAccelerators and Storage RingsCERN-AB-2004-055The longitudinal impedance of the SPS has been reduced significantly by hardware modifications over the last years and the threshold for longitudinal instabilities increased accordingly. We now observe a fast transverse instability on high-intensity single bunches of low longitudinal emittance. The main observed signature and the threshold dependence on beam parameters is described and compared with theoretical expectations and simulations.2004-08-17http://cds.cern.ch/record/791210http://cds.cern.ch/record/791210oai:cds.cern.ch:791210revised version submitted on 2004-09-28 11:42:09 engBenedetto, ElenaZimmermann, FrankDynamics of the Electron Pinch and Incoherent Tune Shift Induced by Electron CloudAccelerators and Storage RingsCERN-AB-2004-054When a proton bunch passes through an electron cloud, the cloud electrons are attracted by the beam electric field and their density strongly increases near the beam centre. This gives rise to an incoherent proton tune shift, which depends on the longitudinal and radial position within the bunch. We present an analytical description of the ’electron pinch’ and the resulting proton tune shift for a circular symmetry and a Gaussian cloud, considering a linear transverse force and various longitudinal beam profiles. Benchmarking and extending the results by computer simulations, we can also explore the effects of a non-linear transverse force.2004-08-17http://cds.cern.ch/record/790657http://cds.cern.ch/record/790657oai:cds.cern.ch:790657revised version submitted on 2004-09-28 15:49:57 engCaspers, FriedhelmFerrari, ALofnes, TSyratchev, I VZiemann, VolkerConceptual Design of a Microwave Confocal Resonator Pick-upAccelerators and Storage RingsCERN-AB-2004-053A confocal resonator may be used as a pick-up for frequencies in the multi-GHz region. In this report we present the design, by analytical and numerical methods, of such a device. Furthermore, we discuss engineering issues, such as the damping of unwanted modes, shielding of image fields and manufacturing tolerances. Such a device can be used both as a pick-up and a kicker where the actual structure is several wavelengths away from the beam in the transverse direction. It is intended for highly relativistic beams and does not require changing the particle trajectory, as opposed to a diagnostic wiggler.2004-08-17http://cds.cern.ch/record/790651http://cds.cern.ch/record/790651oai:cds.cern.ch:790651revised version submitted on 2004-09-28 16:49:38 engFrischholz, HansTückmantel, JoachimValuch, DWeil, CFirst Results with a Fast Phase and Amplitude Modulator for High Power RF ApplicationAccelerators and Storage RingsCERN-AB-2004-052In a high energy and high power superconducting proton linac, it is more economical to drive several cavities with a single high power transmitter rather than to use one transmitter per cavity. However, this option has the disadvantage of not permitting individual control for each cavity, which potentially leads to instabilities. Provided that it can be built at a reasonable cost, a fast phase and amplitude modulator inserted into each cavity feeder line can provide the necessary control capability. A prototype of such a device has been built, based on two fast and compact high power RF phase-shifters, magnetically biased by external coils. The design is described, together with the results obtained at high and low power levels.2004-08-17http://cds.cern.ch/record/790650http://cds.cern.ch/record/790650oai:cds.cern.ch:790650revised version submitted on 2004-09-29 09:35:07 engBroere, JKozsar, IGaroby, RRohlev, ASerrano, JAll Digital IQ Servo-System for CERN LinacsAccelerators and Storage RingsCERN-AB-2004-051A VME based control system has been developed and built at CERN for the servo loops regulating the field in linac accelerating structures. It is an all-digital system built on a single VME card, providing digital detection, processing, and modulation. It is foreseen to be used, in different versions, for the needs of both present and future CERN hadron linacs. The first application will be in the energy ramping RF chain of the CERN Heavy Ion Linac (linac 3). Design principle and the experimental results are described.2004-08-17http://cds.cern.ch/record/790649http://cds.cern.ch/record/790649oai:cds.cern.ch:790649revised version submitted on 2004-09-28 16:44:05 engBohl, THofmann, ALinnecar, Trevor Paul RShaposhnikova, ElenaTückmantel, JoachimEnergy Loss of a Single Bunch in the CERN SPSAccelerators and Storage RingsCERN-AB-2004-050The dependence of energy loss on bunch length was determined experimentally for a single proton bunch in the SPS at 26 GeV/c. This was done from measurements of the synchronous phase as a function of intensity for different capture voltages. The results are compared with the expected dependence calculated from the resistive part of the SPS impedance below 1 GHz. Two impedance sources, the cavities of the 200 MHz RF system and the extraction kickers, give the main contributions to particle energy loss in very good agreement with experiment. The results obtained allow a better understanding of some mechanisms leading to capture loss of the high intensity LHC beam in the SPS.2004-08-17http://cds.cern.ch/record/790648http://cds.cern.ch/record/790648oai:cds.cern.ch:790648revised version submitted on 2004-09-28 16:40:44 engCaspers, FriedhelmCuvet, YGenest, JHaase, MPaoluzzi, MTeixeira, AThe CERN-SPL Chopper Concept and Final LayoutAccelerators and Storage RingsCERN-AB-2004-049CARE-Conf-04-007-HIPPICARE-Conf-2004-007-HIPPIThe fast chopper for the CERN SPL (Superconducting Proton Linac) consists of a double meander structure with β = v/c of 8 % printed on an alumina substrate for the deflecting plates. Each chopper unit is 50 cm long and housed in a quadrupole magnet surrounding the vacuum chamber. The deflecting plates are operated simultaneously in a dual mode, namely traveling wave mode for frequencies above about 10 MHz and as quasi electrostatic deflectors below. The deflecting structures are water-cooled to handle heating from beam losses as well as from the deflecting signal. A detailed mechanical layout is presented including the tri-axial feeding and termination technique as well as a discussion of the drive amplifier.2004-08-17http://cds.cern.ch/record/790647http://cds.cern.ch/record/790647oai:cds.cern.ch:790647revised version submitted on 2004-09-28 16:35:33 engCaspers, FriedhelmGaxiola, EKroyer, TTimmins, MUythoven, JKurennoy, SA Retrofit Technique for Kicker Beam-Coupling Impedance ReductionAccelerators and Storage RingsCERN-AB-2004-048The reduction of the impedance of operational ferrite kicker structures may be desirable in order to avoid rebuilding such a device. Often resistively coated ceramic plates or tubes are installed for this purpose but at the expense of available aperture. Ceramic U-shaped profiles with a resistive coating fitting between the ellipse of the beam and the rectangular kicker aperture have been used to significantly reduce the impedance of the magnet, while having a limited effect on the available physical aperture. Details of this method, constraints, measurements and simulation results as well as practical aspects are presented and discussed.2004-08-17http://cds.cern.ch/record/790645http://cds.cern.ch/record/790645oai:cds.cern.ch:790645revised version submitted on 2004-09-28 16:32:36 engArduini, GianluigiBeam Quality Preservation in the CERN PS-SPS ComplexAccelerators and Storage RingsCERN-AB-2004-047The LHC will require beams of unprecedented transverse and longitudinal brightness. Their production imposes tight constraints on the emittance growth in each element of the LHC injector chain, namely the PS-SPS Accelerator Complex. The problems encountered at the different stages of the acceleration in the complex span a wide range of topics, such as injection matching, RF gymnastics, space charge, transverse and longitudinal single- and coupled-bunch instabilities, and electron cloud effects. The measurement techniques developed and applied to identify and study the various sources of emittance dilution to the high precision required for the LHC beams and the solutions found to control such phenomena are illustrated.2004http://cds.cern.ch/record/790601http://cds.cern.ch/record/790601oai:cds.cern.ch:790601revised version submitted on 2004-09-28 11:36:27 engHerr, WernerMeddahi, MAperture and Stability Studies for the CNGS Proton Beam LineAccelerators and Storage RingsCERN-AB-2004-045The knowledge of the beam stability at the CNGS target is of great importance, both for the neutrino yield and for target rod resistance against non-symmetric beam impact. Therefore, simulating expected imperfections of the beam line elements and possible injection errors into the CNGS proton beam line, the beam spot stability at the target was investigated. Moreover, the mechanical aperture of the CNGS proton beam line was simulated and the results confirmed that the aperture is tight but sufficient.2004http://cds.cern.ch/record/790398http://cds.cern.ch/record/790398oai:cds.cern.ch:790398revised version submitted on 2004-09-28 17:11:58 engHerr, WernerMeddahi, MTrajectory Correction Studies for the CNGS Proton Beam LineAccelerators and Storage RingsCERN-AB-2004-044The performance of the proposed trajectory correction scheme for the CNGS proton beam line was checked with an advanced simulation program. It was first investigated whether the scheme will be sufficient, and if some correctors or monitors could be suppressed in order to reduce the cost. The correction scheme was in particular tested for the case of faulty correctors or monitors. Possible critical scenarios were identified, which may not be visible in a purely statistical analysis. This part of the analysis was largely based on the experience with trajectory and orbit correction problems encountered in the SPS and LEP. The simulation of the trajectory correction procedure was done using recently developed software.2004http://cds.cern.ch/record/790397http://cds.cern.ch/record/790397oai:cds.cern.ch:790397revised version submitted on 2004-09-28 17:09:08 engSuberlucq, GuyTechnological Challenges for High-Brightness Photo-InjectorsAccelerators and Storage RingsCERN-AB-2004-043CLIC-Note-602CARE-Conf-04-029-PHINCARE-Conf-2004-029-PHINMany applications, from linear colliders to free-electron lasers, passing through light sources and many other electron sources, require high brightness electron beams, usually produced by photo-injectors. Because certain parameters of these applications differ by several orders of magnitude, various solutions were implemented for the design and construction of the three main parts of the photo-injectors: lasers, photocathodes and guns. This paper summarizes the different requirements, how they lead to technological challenges and how R&D programs try to overcome these challenges. Some examples of state-of-the-art parts are presented.2004http://cds.cern.ch/record/790396http://cds.cern.ch/record/790396oai:cds.cern.ch:790396revised version submitted on 2004-09-28 16:54:15 engBorburgh, JCrescenti, MFowler, AHourican, MMetzmacher, K DSermeus, LThe Design of the Special Magnets for PIMMS/TERAAccelerators and Storage RingsCERN-AB-2004-039In the framework of a collaboration agreement with the TERA Foundation, CERN provided the design, drawings and engineering specifications for two kickers, one chopper and three bumper magnets as well as three magnetic and two electrostatic septa, power supplies for the electrostatic septa, kickers and bumpers including control electronics for the PIMMS/TERA proton and carbon ion medical synchrotron. The first application will be in the Italian National Centre for Hadrontherapy, to be constructed in Pavia. The main features of the devices are described along with the strategic design choices, directed by the demand for very high reliability and minimum maintenance.2004http://cds.cern.ch/record/789782http://cds.cern.ch/record/789782oai:cds.cern.ch:789782revised version submitted on 2004-09-28 16:02:26 engArduini, GianluigiBohl, TCaspers, FriedhelmGaxiola, E HKroyer, TTimmins, MVos, LUythoven, JBeam Induced Heating of the SPS Fast Pulsed MagnetsAccelerators and Storage RingsCERN-AB-2004-038Fast pulsed magnets with ferrite yokes are used in CERN's SPS accelerator for beam injection, extraction and excitation for tune measurements. The impedance of the ferrite structures can provoke significant beam induced heating, especially for beams with high peak currents as for LHC operation, even beyond the Curie temperature. The expected heating in the different kicker systems for various operational modes is compared with beam measurements. Estimates of the beam induced power have been derived from measured beam spectra. A fast extraction kicker system has recently been equipped with a cooling system. The measured cooling performance is compared with data from laboratory set-ups and numerical simulations.2004http://cds.cern.ch/record/789781http://cds.cern.ch/record/789781oai:cds.cern.ch:789781revised version submitted on 2004-09-29 09:29:30 engGaxiola, EAntoine, ABurkel, PCarlier, ECastronuovo, FDucimetière, LSillanoli, YTimmins, MUythoven, JUpgrade and Tests of the SPS Fast Extraction Kicker System for LHC and CNGSAccelerators and Storage RingsCERN-AB-2004-037A fast extraction kicker system has been installed in the SPS and successfully used in extraction tests in 2003. It will serve to send beam to the anticlockwise LHC ring and the CNGS neutrino facility. The magnets and pulse generators have been recuperated from an earlier installation and upgraded to fit the present application. Hardware improvements include diode stacks as replacement of the previous dump thyratron switches, a cooling system of the magnets, sensors for its ferrite temperatures and magnetic field quality assessment. In preparation of the future use for 450 GeV/c transfer to LHC and double batch extraction at 400 GeV/c for CNGS the tests comprised extractions of single bunches, twelve bunches in a single extraction and single bunches in a double extraction. The measured kick characteristics of the upgraded system are presented, along with a discussion of Pspice simulation results. Further improvements will be discussed which are intended to make the system comply with the specifications for CNGS.2004http://cds.cern.ch/record/789780http://cds.cern.ch/record/789780oai:cds.cern.ch:789780revised version submitted on 2004-09-28 15:55:44 engGoddard, BCollier, PaulLamont, MMertens, VSigerud, KUythoven, JWenninger, JBeam Commissioning of the SPS LSS 4 Extraction and the TT40 Transfer LineAccelerators and Storage RingsCERN-AB-2004-036The new fast extraction system in LSS4 of the SPS and the transfer line TT40 were commissioned with beam in late 2003. The layout and functionality of the main elements are briefly explained, including the various hardware subsystems and the control system. The safety procedures, test objectives and results of the system commissioning with beam are described, together with the test methodology.2004http://cds.cern.ch/record/789778http://cds.cern.ch/record/789778oai:cds.cern.ch:789778revised version submitted on 2004-09-28 15:53:35 eng Poole, J Postmortem of the Electronic Publication of the EPAC 2004 Proceedings Accelerators and Storage Rings AB-Note-2005-016 CERN-AB-Note-2005-016 The proceedings EPAC'04 were the fifth in the series to be published electronically. This report describes the preparations before the conference, the activities at the conference and the work afterwards which was required to produce the CD-ROM and HTML versions of the proceedings. The process for this conference was based on the JACoW Scientific Programme Management System (SPMS) which was in full production for the first time. The conference was very well attended and even more papers were published than before. This report is the fifth in the series of post mortems and reflects what was new in 2004. 2005-03-07 http://cds.cern.ch/record/826520 http://cds.cern.ch/record/826520 2011-01-03T21:32:29Z http://cds.cern.ch/record/1318481 http://cds.cern.ch/record/1318481 engTrentadue, RClemencic, MDykstra, DFrank, MFront, DKalkhof, ALoth, ANowak, MSalnikov, AValassi, AWache, MLCG persistency framework (CORAL, COOL, POOL): Status and outlook in 2012Computing and ComputersThe LCG Persistency Framework consists of three software packages (CORAL, COOL and POOL) that address the data access requirements of the LHC experiments in several different areas. The project is the result of the collaboration between the CERN IT Department and the three experiments (ATLAS, CMS and LHCb) that are using some or all of the Persistency Framework components to access their data. POOL is a hybrid technology store for C++ objects, using a mixture of streaming and relational technologies to implement both object persistency and object metadata catalogs and collections. CORAL is an abstraction layer with an SQL-free API for accessing data stored using relational database technologies. COOL provides specific software components and tools for the handling of the time variation and versioning of the experiment conditions data. This presentation reports on the status and outlook in each of the three sub-projects at the time of the CHEP2012 conference, reviewing the usage of each package in the three LHC experiments.2012http://cds.cern.ch/record/1530490http://cds.cern.ch/record/1530490oai:cds.cern.ch:1530490 eng Petit-Jean-Genaz, Christine 9th European Particle Accelerator Conference Accelerators and Storage Rings JACoW 2004 http://cds.cern.ch/record/646094 Conference http://cds.cern.ch/record/646094 Lucerne, Switzerland 5 - 9 Jul 2004 Ch. Petit-Jean-Genaz christine.petit-jean@cern.ch doi:10.1016/j.nima.2004.06.067engMeshkov, I NMöhl, DKatayama, TSidorin, ASmirnov, A YuSyresin, E MTrubnikov, GTsutsui, HNumerical simulation of crystalline ion beams in storage ringAccelerators and Storage RingsThe use of crystalline ion beams can increase luminosity in the collider and in experiments with targets for investigation of rare radioactive isotopes. The ordered state of circulating ion beams was observed at several storage rings: NAP-M (Proceedings of the Fourth All Union Conference on Charged Particle Accelerators, Vol. 2, Nauka, Moscow, 1975 (in Russian); Part. Accel. 7 (1976) 197; At. Energy 40 (1976) 49; Preprint CERN/PS/AA 79-41, Geneva, 1979) (Novosibirsk), ESR (Phys. Rev. Lett. 77 (1996) 3803) and SIS (Proceedings of EPAC'2000, 2000) (Darmstadt), CRYRING (Proceedings of PAC'2001, 2001) (Stockholm) and PALLAS (Proceedings of the Conference on Applications of Accelerators in Research and Industry, AIP Conference Proceedings, p. 576, in preparation) (Munchen). New criteria of the beam orderliness are derived and verified with a new program code. Molecular dynamics technique is inserted in BETACOOL program (Proceedings of Beam Cooling and Related Topics, Bad Honnef, Germany, 2001) and used for numerical simulation of crystalline beams. The sudden reduction of momentum spread in the ESR experiment is described with this code. The simulation shows a good agreement with the experimental results. The code has then been used to calculate characteristics of the ordered state of ion beams for the MUSES Ion Ring (IR) (MUSES Conceptual Design Report, RIKEN, Japan, 2001) in collider mode. A new strategy of the cooling process is proposed which permits to increase significantly the linear density of the ordered ion beam and thereby the luminosity of electron-ion colliding experiments.2004http://cds.cern.ch/record/81846710.1016/j.nima.2004.06.067http://cds.cern.ch/record/818467oai:cds.cern.ch:818467