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2002_EPAC
31 items
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1.
Status Report on Field Quality in the Main LHC Dipoles / Bottura, L ; Pauletta, S ; Remondino, Vittorio ; Sanfilippo, S ; Scandale, Walter ; Todesco, Ezio
We give the present status of the field quality in the main LHC dipoles. Special emphasis is given to the collared coil data: a few tens of coils have been built, allowing a first analysis of the variability between producers, and estimates of the random part. [...]
LHC-Project-Report-579; CERN-LHC-Project-Report-579.- Geneva : CERN, 2002 - 4 p. Accelerator Technology Access to fulltext document: PDF; External link: Published version from JACoW
In : 8th European Particle Accelerator Conference, Paris, France, 3 - 7 Jun 2002, pp.2439 - Please contact the library if you need to access this document.
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2.
Cryosorber Studies for the LHC Long Straight Section Beam Screens with COLDEX / Baglin, V ; Collins, I R ; Gröbner, Oswald ; Grünhagel, C ; Jenninger, B
The cold bore experiment (COLDEX), that can be cooled below 3 K, has been fitted with a ~ 2 m long actively cooled beam screen equipped with cryosorber to simulate the LHC Long Straight Section (LSS) beam screens. Effects of both synchrotron radiation at grazing incidence with 194 eV critical energy and gas injections have been studied. [...]
LHC-Project-Report-580; CERN-LHC-Project-Report-580.- Geneva : CERN, 2002 - 4 p. Accelerator Technology Access to fulltext document: PDF; External link: Published version from JACoW
In : 8th European Particle Accelerator Conference, Paris, France, 3 - 7 Jun 2002, pp.2538 - Please contact the library if you need to access this document.
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3.
Optimization of the Even Normal Multipole Components in the Main Dipole of the Large Hadron Collider / Bottura, L ; Redaelli, S ; Remondino, Vittorio ; Sanfilippo, S ; Savary, F ; Scandale, Walter ; Todesco, Ezio
In this paper we discuss even multipolar components of the Large Hadron Collider dipole in relation to the manufacturing features and target values required by beam dynamics. Due to the two-in-one collar geometry, systematic components are induced by the mutual influence of the two apertures and are strongly affected by the shape of the magnetic iron yoke. [...]
LHC-Project-Report-578; CERN-LHC-Project-Report-578.- Geneva : CERN, 2002 - 4 p. Accelerator Technology Access to fulltext document: PDF; External link: Published version from JACoW
In : 8th European Particle Accelerator Conference, Paris, France, 3 - 7 Jun 2002, pp.2427 - Please contact the library if you need to access this document.
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4.
Study of Offset Collisions and Beam Adjustment in the LHC Using a Strong-Strong Simulation Model / Muratori, B
The bunches of the two opposing beams in the LHC do not always collide head-on. The beam-beam effects cause a small, unavoidable separation under nominal operational conditions. [...]
LHC-Project-Report-593; CERN-LHC-Project-Report-593.- Geneva : CERN, 2002 - 4 p. Beam Dynamics and Electromagnetic Fields Access to fulltext document: PDF; External link: Published version from JACoW
In : 8th European Particle Accelerator Conference, Paris, France, 3 - 7 Jun 2002, pp.1270 - Please contact the library if you need to access this document.
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5.
Equilibrium Beam Distribution and Halo in the LHC / Assmann, R W ; Schmidt, F ; Zimmermann, Frank ; Zorzano-Mier, M P
The equilibrium LHC beam distribution at large amplitudes is a crucial input to the collimation and machine protection design, as well as to background studies. Its estimation requires a knowledge of the diffusion rates at which beam particles are transported to large transverse or longitudinal amplitudes. [...]
LHC-Project-Report-592; CERN-LHC-Project-Report-597; CERN-LHC-Project-Report-592; LHC-Project-Report-597.- Geneva : CERN, 2002 - 4 p. Beam Dynamics and Electromagnetic Fields Access to fulltext document: PDF; External link: Published version from JACoW
In : 8th European Particle Accelerator Conference, Paris, France, 3 - 7 Jun 2002, pp.1326 - Please contact the library if you need to access this document.
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6.
Simulating Dynamic Effects in Superconducting Magnets at the LHC / Hayes, M
Changes in multipole errors (during injection or ramping) of the superconducting magnets in the LHC affect important beam parameters such as the closed orbit, tune and chromaticity. In the following it is described how the currently used simulation tool (SixTrack) has been modified to simulate this time dependence in order to reproduce these effects. [...]
LHC-Project-Report-591; CERN-LHC-Project-Report-591.- Geneva : CERN, 2002 - 4 p. Beam Dynamics and Electromagnetic Fields Access to fulltext document: PDF; External link: Published version from JACoW
In : 8th European Particle Accelerator Conference, Paris, France, 3 - 7 Jun 2002, pp.1631 - Please contact the library if you need to access this document.
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7.
Tolerances of the Spool Piece Correction System for the LHC / Hayes, M
The LHC main superconducting dipoles are provided with a spool piece correction system which is to be used to correct locally the non-linear multipole errors b3, b4 and b5. The tolerances of this correction system to failures are discussed. [...]
LHC-Project-Report-590; CERN-LHC-Project-Report-590.- Geneva : CERN, 2002 - 4 p. Beam Dynamics and Electromagnetic Fields Access to fulltext document: PDF; External link: Published version from JACoW
In : 8th European Particle Accelerator Conference, Paris, France, 3 - 7 Jun 2002, pp.1255 - Please contact the library if you need to access this document.
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8.
The Influence of Time-Dependent Magnetic Field Errors on the Specifications of Feedback and Collimation Systems / Assmann, R W ; Fartoukh, Stéphane David ; Hayes, M ; Wenninger, J
During injection and ramping at the LHC the time dependence of the errors in the main dipoles will have an effect on the beam dynamics. These time dependencies are simulated using the latest tracking codes. [...]
LHC-Project-Report-589; CERN-LHC-Project-Report-589.- Geneva : CERN, 2002 - 4 p. Beam Dynamics and Electromagnetic Fields Access to fulltext document: PDF; External link: Published version from JACoW
In : 8th European Particle Accelerator Conference, Paris, France, 3 - 7 Jun 2002, pp.1139 - Please contact the library if you need to access this document.
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9.
Two-Stream Effects in Present and Future Accelerators / Zimmermann, Frank
Electron beams are perturbed by ions in a similar way as proton and positron beams are by electrons, generated via gas ionization, photoemission, or multipacting. Fast beam-ion or electron-cloud "two-stream" instabilities become more severe for higher beam current or closer bunch spacing, and they may limit the ultimate performance of an accelerator. [...]
LHC-Project-Report-588; CERN-LHC-Project-Report-588.- Geneva : CERN, 2002 - 6 p. High Energy Circular Accelerators and Colliders Access to fulltext document: PDF; External link: Published version from JACoW
In : 8th European Particle Accelerator Conference, Paris, France, 3 - 7 Jun 2002, pp.25 - Please contact the library if you need to access this document.
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10.
Intermediate Review of Single Bunch Collective Effects in the LHC / Angal-Kalinin, Deepa ; Brandt, D ; Vos, L
This paper presents an intermediate review of the single bunch collective effects in the LHC. It first reviews the LHC impedance budget including all elements for which a design is presently available. [...]
LHC-Project-Report-587; CERN-LHC-Project-Report-587.- Geneva : CERN, 2002 - 4 p. High Energy Circular Accelerators and Colliders Access to fulltext document: PDF; External link: Published version from JACoW
In : 8th European Particle Accelerator Conference, Paris, France, 3 - 7 Jun 2002, pp.305 - Please contact the library if you need to access this document.
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11.
Measuring Beta Functions and Dispersion in the Early LHC / Assmann, R W ; Fartoukh, Stéphane David ; Zimmermann, Frank
Achieving nominal beam conditions in the LHC requires a small beta beating and a small dispersion mismatch. We compare the linear optics errors expected from linear and nonlinear magnetic field imperfections and magnet mis-alignments with the required values. [...]
LHC-Project-Report-586; CERN-LHC-Project-Report-586.- Geneva : CERN, 2002 - 4 p. High Energy Circular Accelerators and Colliders Access to fulltext document: PDF; External link: Published version from JACoW
In : 8th European Particle Accelerator Conference, Paris, France, 3 - 7 Jun 2002, pp.296 - Please contact the library if you need to access this document.
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12.
Coupled Bunch Instabilities in the LHC / Angal-Kalinin, Deepa ; Vos, L
In the LHC, the coupled bunch instabilities will be mainly driven by the RF cavities and the resistive wall effect. The growth times of these instabilities have been estimated taking into consideration the undamped and damped higher order modes of these cavities. [...]
LHC-Project-Report-585; CERN-LHC-Project-Report-585.- Geneva : CERN, 2002 - 4 p. High Energy Circular Accelerators and Colliders Access to fulltext document: PDF; External link: Published version from JACoW
In : 8th European Particle Accelerator Conference, Paris, France, 3 - 7 Jun 2002, pp.290 - Please contact the library if you need to access this document.
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13.
Parity Effects in Spin Decoherence / Melikidze, A ; Dobrovitski, V V ; De Raedt, H A ; Katsnelson, M I ; Harmon, B N
We demonstrate that decoherence of many-spin systems can drastically differ from decoherence of single-spin systems. [...]
quant-ph/0212097. - 2002. - 5 p.
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14.
Measurement of single-spin azimuthal asymmetries in semi-inclusive electroproduction of pions and kaons on a longitudinally polarised deuterium target / Airapetian, A /HERMES Collaboration
Single-spin asymmetries have been measured for semi-inclusive electroproduction of $\pi^+$, $\pi^-$, $\pi^0$ and $K^+$ mesons in deep-inelastic scattering off a longitudinally polarised deuterium target. The asymmetries appear in the distribution of the hadrons in the azimuthal angle $\phi$ around the virtual photon direction, relative to the lepton scattering plane. [...]
hep-ex/0212039; DESY-02-226; DESY-2002-226.- Hamburg : DESY, 2003 - 10 p. - Published in : Phys. Lett. B 562 (2003) 182-192 External link: hep-ex/0212039 PDF
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15. CERN-ARCH-DSU-LEGAL-0523
Legal Service : Memorandum of Understanding between CERN (European Organization for Nuclear Research) and QMUL (Queen Mary University of London (SMD))
CERN. Geneva Queen Mary University of London (QMUL) . 2002-03-14  Description of record group
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16.
Synchrotron radiation studies of the LHC dipole beam screen with COLDEX / Baglin, V ; Collins, I R ; Gröbner, Oswald ; Grünhagel, C ; Jenninger, B
The cold bore experiment (COLDEX) installed in a beam line of the electron-positron accumulator (EPA) at CERN, has been used to study the effect of synchrotron radiation onto the LHC dipole beam screen. The ~ 2 m long cryostat, that can be cooled below 3 K, is fitted with an actively cooled beam screen. [...]
LHC-Project-Report-584; CERN-LHC-Project-Report-584.- Geneva : CERN, 2002 - 4 p. Accelerator Technology Access to fulltext document: PDF; External link: Published version from JACoW
In : 8th European Particle Accelerator Conference, Paris, France, 3 - 7 Jun 2002, pp.2535 - Please contact the library if you need to access this document.
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20.
The variation of the secondary electron yield and of the desorption yield of copper under electron bombardment : Origin and impact on the conditioning of the LHC / Henrist, Bernard ; Hilleret, Noël (CERN) ; Scheuerlein, C ; Taborelli, M ; Vorlaufer, G
The operation of most radio-frequency components in accelerators rely on the conditioning obtained usually by gradually increasing the power fed into these devices. This effect is related to the reduction of the desorption yields and of the secondary electron yields of surfaces exposed to electron bombardment. [...]
LHC-Project-Report-583; CERN-LHC-Project-Report-583.- Geneva : CERN, 2002 - 4 p. Accelerator Technology Access to fulltext document: PDF; External link: Published version from JACoW
In : 8th European Particle Accelerator Conference, Paris, France, 3 - 7 Jun 2002, pp.2553 - Please contact the library if you need to access this document.
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23.
Mechanical behaviour of vacuum chambers and beam screens under quench conditions in dipole and quadrupole fields / Rathjen, C
A method based on analytical formulas is described to calculate bending moments, stresses, and deformations of vacuum chambers and beam screens in dipole and in quadrupole fields during a magnet quench. Solutions are given for circular and racetrack shaped structures. [...]
LHC-Project-Report-582; CERN-LHC-Project-Report-582.- Geneva : CERN, 2002 - 4 p. Accelerator Technology Access to fulltext document: PDF; External link: Published version from JACoW
In : 8th European Particle Accelerator Conference, Paris, France, 3 - 7 Jun 2002, pp.2580 - Please contact the library if you need to access this document.
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25.
A simulation study of the electron cloud in the experimental regions of the LHC / Rossi, A ; Rumolo, Giovanni ; Zimmermann, Frank
The LHC experimental regions (ATLAS, ALICE, CMS and LHCb) are characterised by having a variable geometry, non-uniform magnetic field, and the presence of two beams that will collide at the Interaction Point (IP). A detailed study of electron multipacting in the experimental chambers is needed to establish the pressure increase due to electron stimulated desorption, especially critical in the experimental regions. [...]
LHC-Project-Report-581; CERN-LHC-Project-Report-581.- Geneva : CERN, 2002 - 4 p. Accelerator Technology Fulltext: PDF; Published version from CERN: PDF; External link: Published version from JACoW
In : 8th European Particle Accelerator Conference, Paris, France, 3 - 7 Jun 2002, pp.2583
Proceedings ECLOUD'02 : Mini Workshop on Electron Cloud Simulations for Proton and Positron Beams, Paris, France, 3 - 7 Jun 2002, pp.123-127 - Please contact the library if you need to access this document.
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26.
Reliability analysis for the quench detection in the LHC machine / Denz, R ; Rodríguez-Mateos, F ; Vergara-Fernández, A
The Large Hadron Collider (LHC) will incorporate a large amount of superconducting elements that require protection in case of a quench. Key elements in the quench protection system are the electronic quench detectors. [...]
LHC-Project-Report-596; CERN-LHC-Project-Report-596.- Geneva : CERN, 2002 - 4 p. Accelerator Technology Access to fulltext document: PDF; External link: Published version from JACoW
In : 8th European Particle Accelerator Conference, Paris, France, 3 - 7 Jun 2002, pp.2445 - Please contact the library if you need to access this document.
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27.
Efficiency for the imperfect LHC collimation system / Assmann, R W ; Jeanneret, J B ; Kaltchev, D I
The LHC collimation system requires a high cleaning efficiency in order to prevent magnet quenches due to regular beam diffusion. The cleaning efficiency is significantly reduced due to imperfections of the collimator jaws and the machine optics. [...]
LHC-Project-Report-598; CERN-LHC-Project-Report-598.- Geneva : CERN, 2002 - 4 p. High Energy Circular Accelerators and Colliders Access to fulltext document: PDF; External link: Published version from JACoW
In : 8th European Particle Accelerator Conference, Paris, France, 3 - 7 Jun 2002, pp.293 - Please contact the library if you need to access this document.
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28.
Optics Studies for Diffractive Physics at the LHC / Faus-Golfe, A ; Verdier, A
Forward protons with momenta close to the beam-momentum arise either from elastic scattering or from single or double diffraction. These protons are very close to the beamline and can only be measured downstream using "beam close detectors". [...]
LHC-Project-Report-601; CERN-LHC-Project-Report-601.- Geneva : CERN, 2002 - 4 p. High Energy Circular Accelerators and Colliders Access to fulltext document: PDF; External link: Published version from JACoW
In : 8th European Particle Accelerator Conference, Paris, France, 3 - 7 Jun 2002, pp.323 - Please contact the library if you need to access this document.
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29.
Requirements for the LHC collimation system / Assmann, R W ; Baishev, I S ; Brugger, M ; Bruno, L ; Burkhardt, H ; Burtin, G ; Dehning, Bernd (CERN) ; Fischer, C ; Goddard, B ; Gschwendtner, E et al.
The LHC requires efficient collimation during all phases of the beam cycle. Collimation plays important roles in prevention of magnet quenches from regular beam diffusion, detection of abnormal beam loss and subsequent beam abort, radiation protection, and passive protection of the superconducting magnets in case of failures. [...]
LHC-Project-Report-599; CERN-LHC-Project-Report-599.- Geneva : CERN, 2002 - 4 p. High Energy Circular Accelerators and Colliders Access to fulltext document: PDF; External link: Published version from JACoW
In : 8th European Particle Accelerator Conference, Paris, France, 3 - 7 Jun 2002, pp.197 - Please contact the library if you need to access this document.
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30.
Helium cryogenic systems for the LEP2 and LHC projects at CERN / Lebrun, P
CERN is presently operating a large distributed 4.5 K helium cryogenic system (48 kW@4.5 K equivalent) for cooling the superconducting acceleration cavities of the 26.7 km circumference LEP2 lepton collider. [...]
CERN-LHC-96-005-ACR. - 1996. - 7 p.
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31.
Operating at 1.8 K : the technology of superfluid helium / Lebrun, P
The technical properties of helium II ("superfluid" helium) are presented from the user point of view. Its applications to the cooling of superconducting devices, particularly in accelerators and colliders are discussed in terms of heat transfer capability and limitations in conductive and convective modes. [...]
CERN-LHC-96-002-ARC.- Geneva : CERN, 1996 - 17 p. Report Fulltext: PDF TIF;
In : CAS - CERN Accelerator School : Superconductivity in Particle Accelerators, pp.321-334 - Please contact the library if you need to access this document.
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