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1.
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The Mechanical Design for the LHC Collimators
/ Bertarelli, A ; Aberle, O ; Assmann, R W ; Chiaveri, Enrico ; Kurtyka, T ; Mayer, M ; Perret, R ; Sievers, P
The design of the LHC collimators must comply with the very demanding specifications entailed by the highly energetic beam handled in the LHC: these requirements impose a temperature on the collimating jaws not exceeding 50ºC in steady operations and an unparalleled overall geometrical stability of 25 micro-m on a 1200 mm span. At the same time, the design phase must meet the challenging deadlines required by the general time schedule. [...]
LHC-Project-Report-786; CERN-LHC-Project-Report-786.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.545
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2.
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Performance Limits and IR Design Challenges of a Possible LHC Luminosity Upgrade Based on Nb-Ti SC Magnet Technology
/ Brüning, Oliver Sim ; Devred, Arnaud ; Ostojic, R ; Rossi, L ; Ruggiero, F ; Scandale, Walter ; Taylor, T
We investigate the maximum LHC performance for a standard IR design based on classical NbTi insertion magnets. We include in our analysis a ternary Nb-based ductile allow such as NbTi(Ta), a less developed but relatively cheap superconducting material which may allow to gain about 1 T in the peak field in the coils, and discuss the corresponding luminosity reach for a possible LHC upgrade compared to that based on Nb$_{3}$Sn magnets..
LHC-Project-Report-785; CERN-LHC-Project-Report-785; CARE-Conf-04-005-HHH; CARE-Conf-2004-005-HHH.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.608
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4.
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Accuracy of Profile Monitors and LHC Emittance Measurements
/ Arduini, Gianluigi ; Dehning, Bernd (CERN) ; Ferioli, G ; Koopman, J ; Kramer, Daniel ; Roncarolo, F
The monitoring and controlling of the beam transverse emittance is essential to allow high luminosity performances in a collider operation. The profile monitors in the LHC injection chain are exploited to determine their precision. [...]
LHC-Project-Report-782; CERN-LHC-Project-Report-782.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.2496
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5.
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Design of the Beam Loss Monitoring System for the LHC Ring
/ Holzer, E B ; Dehning, Bernd (CERN) ; Effinger, E ; Ferioli, G ; González, J L ; Gschwendtner, E ; Guaglio, Gianluca ; Hodgson, M ; Prieto, V ; Zamantzas, C
The beam loss monitoring (BLM) system of the LHC is one of the most critical elements for the protection of the LHC. [...]
LHC-Project-Report-781 ; CERN-LHC-Project-Report-781.
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2004. - 4 p.
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7.
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LHC Orbit Feedback Tests at the SPS
/ Steinhagen, Ralph J ; Andersson, H ; Jensen, L K ; Jones, R ; Lamont, M ; Wenninger, J
The real-time orbit feedback system foreseen for the LHC will be an essential component for reliable and safe machine operation. A test setup including a number of beam position monitors equipped with the LHC acquisition and readout system have been installed in the SPS ring to perform prototyping work on such an orbit feedback. [...]
LHC-Project-Report-779; CERN-LHC-Project-Report-779.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.2499
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10.
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The LHC Lead Injector Chain
/ Beuret, A ; Borburgh, J ; Blas, A ; Burkhardt, H ; Carli, Christian ; Chanel, M ; Fowler, A ; Gourber-Pace, M ; Hancock, S ; Hourican, M et al.
A sizeable part of the LHC physics programme foresees lead-lead collisions with a design luminosity of 1027 cm-2 s-1. This will be achieved after an upgrade of the ion injector chain comprising Linac3, LEIR, PS and SPS machines [1,2]. [...]
LHC-Project-Report-776; CERN-LHC-Project-Report-776.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.1153
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12.
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The New Layout of the LHC Cleaning Insertions
/ Assmann, R W ; Aberle, O ; Brüning, Oliver Sim ; Chemli, S ; Gasser, D ; Jeanneret, J B ; Jiménez, J M ; Kain, V ; Métral, Elias ; Peón-Hernández, G et al.
The improved LHC collimation system required significant changes in the layout and design of the warm insertions. Requirements for collimation, optics, impedance, vacuum, and additional infrastructure are described and the adopted layout is presented. [...]
LHC-Project-Report-774; CERN-LHC-Project-Report-774.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.539
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13.
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An Improved Cllimation System for the LHC
/ Assmann, R W ; Aberle, O ; Bertarelli, A ; Braun, H ; Brugger, M ; Brüning, Oliver Sim ; Bruno, L ; Calatroni, S ; Chiaveri, Enrico ; Dehning, Bernd (CERN) et al.
The handling of the high-intensity LHC beams in a super-conducting environment requires a high-robustness collimation system with unprecedented cleaning efficiency. For gap closures down to 2.2 mm no beam instabilities must be induced from the collimator impedance. [...]
LHC-Project-Report-773; CERN-LHC-Project-Report-773.-
Geneva : CERN, 2004 - 3 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.536
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14.
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Limits to the Performance of the LHC with Ion Beams
/ Jowett, John M ; Braun, Hans Heinrich (CERN) ; Gresham, M I ; Mahner, E ; Nicholson, A N ; Shaposhnikova, Elena ; Pshenichnov, I A
The performance of the LHC as a heavy-ion collider will be limited by a diverse range of phenomena that are often qualitatively different from those limiting the performance with protons. We summarise the latest understanding and results concerning the consequences of nuclear electromagnetic processes in lead ion collisions, the interactions of ions with the residual gas and the effects of lost ions on the beam environment and vacuum. [...]
LHC-Project-Report-772; CERN-LHC-Project-Report-772.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.578
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15.
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Numerical Studies of the Impact of the Separation Dipoles and Insertion Quadrupoles Field Quality on the Dynamic Aperture of the CERN LHC
/ Brüning, Oliver Sim ; Fartoukh, Stéphane David ; Giovannozzi, Massimo ; Risselada, Thys ; Schmidt, F
A wide range of magnets, both warm and superconducting, will be used in the LHC. In addition to main dipoles, quadrupoles are used to focus the beam in regular arcs. [...]
LHC-Project-Report-771; CERN-LHC-Project-Report-771.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.1858
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18.
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Collimation in the Transfer Lines to the LHC ; rev. version
/ Burkhardt, H ; Goddard, B ; Kadi, Y ; Kain, V ; Weterings, W
The intensities foreseen for injection into the LHC are over an order of magnitude above the expected damage levels. The TI 2 and TI 8 transfer lines between the SPS and LHC are each about 2.5 km long and comprise many magnet families. [...]
LHC-Project-Report-768; CERN-LHC-Project-Report-768.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.554
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19.
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Simulated Emittance Growth due to Electron Cloud for SPS and LHC
/ Benedetto, Elena ; Rumolo, Giovanni ; Schulte, Daniel (CERN) ; Zimmermann, Frank (CERN)
The emittance growth caused by an electron cloud is simulated by the HEADTAIL code with conducting boundary conditions. Under some conditions the simulation results may depend on the number of beam-cloud interaction points, the phase advance between them and the number of macroparticles used to represent beam and cloud. [...]
LHC-Project-Report-767; CERN-LHC-Project-Report-767.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.1831
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20.
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Collimation of Heavy Ion Beams in LHC
/ Assmann, R W ; Braun, Hans Heinrich (CERN) ; Ferrari, A ; Jowett, John M ; Jeanneret, J B ; Pshenichnov, I A
The LHC collimation system is designed to cope with requirements of proton beams having 100 times higher beam power than the nominal LHC heavy ion beam. In spite of this, specific problems occur for ion collimation, due to different particle-collimator interaction mechanism for ions and protons. [...]
LHC-Project-Report-766; CERN-LHC-Project-Report-766.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.551
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26.
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Control of the LHC 400 MHz RF System (ACS)
/ Arnaudon, L ; Disdier, M ; Maesen, P ; Prax, M
The LHC ACS RF system is composed of 16 superconducting cavities, eight per ring. Each ring has two cryomodules, each containing four cavities. [...]
LHC-Project-Report-760; CERN-LHC-Project-Report-760.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.533
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28.
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Expected Performance and Beam-Based Optimization of the LHC Collimation System
/ Assmann, R W ; Holzer, E ; Jeanneret, J B ; Kain, V ; Redaelli, S ; Robert-Démolaize, G ; Wenninger, J
The cleaning efficiency requirements in the LHC are beyond the requirements at other circular colliders. The achievable ideal cleaning efficiency in the LHC is presented for the improved LHC collimation system. [...]
LHC-Project-Report-758; CERN-LHC-Project-Report-758.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.1825
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29.
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Industrial Production of the eight normal-conducting 200 MHz ACN cavities for the LHC
/ Chiaveri, Enrico ; Hanni, R ; Linnecar, Trevor Paul R ; Losito, R ; Marque, S ; Tückmantel, Joachim
The LHC-ACN RF system consists of 8 normalconducting cavities and is designed to reduce beam losses in the LHC when injecting beams with longitudinal emittance > 0.7 eVs from the CERN SPS. The cavity design took into account the possibility of recuperating all the "ancillary" equipment (tuners, fundamental mode damper, High Order Mode (HOM) couplers) from the old CERN SPS 200MHz system. [...]
LHC-Project-Report-757; CERN-LHC-Project-Report-757.-
Geneva : CERN, 2004 - 4 p.
External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.956
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30.
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Conceptual Design of the LHC Beam Dumping Protection Elements TCDS and TCDQ
/ Goddard, B ; Riffaud, R ; Sans-Merce, M ; Weterings, W
The Beam Dumping System for the Large Hadron Collider, presently under construction at CERN, consists, per ring, of a set of horizontally deflecting extraction kicker magnets, vertically deflecting steel septa, dilution kickers and finally, a couple of hundred metres further downstream, an absorber block. A fixed diluter (TCDS) will protect the septa in the event of a beam dump that is not synchronised with the particle free gap or a spontaneous firing of the extraction kickers which will cause the beam to sweep over the septum. [...]
LHC-Project-Report-756; CERN-LHC-Project-Report-756.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.629
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31.
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Possible Causes and Consequences of Serious Failures of the LHC Machine Protection Systems
/ Filippini, R ; Goddard, B ; Gyr, Marcel ; Kain, V ; Schmidt, R ; Uythoven, J ; Wenninger, J
The LHC machine protection systems, including the beam dumping system, are designed to ensure that failures leading to serious damage to the LHC during its lifetime are extremely unlikely. These kind of failures, for instance requiring a combination of equipment failure and surveillance failure, have to date been considered as being 'beyond the design case'. [...]
LHC-Project-Report-755; CERN-LHC-Project-Report-755.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.620
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32.
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Reliability Issues on the LHC Beam Dumping System
/ Carlier, E ; Filippini, R ; Goddard, B ; Uythoven, J
The Beam Dumping System of the Large Hadron Collider, presently under construction at CERN, must function with utmost reliability to protect the personnel, minimize the risk of severe damage to the machine and avoid undue impact to the environment. The dumping action must be synchronized with the particle free gap and the field of the extraction and dilution elements must be well adjusted to the beam energy. [...]
LHC-Project-Report-754; CERN-LHC-Project-Report-754.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.563
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33.
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Aperture and Delivery Precision of the LHC Injection System
/ Goddard, B ; Gyr, Marcel ; Jeanneret, J B ; Kain, V ; Lamont, M ; Maire, V ; Mertens, V ; Wenninger, J
The main LHC injection elements in interaction regions 2 and 8 comprise the injection septa (MSI), the injection kickers (MKI), together with three families of passive protection devices (TDI, TCDD and TCLI). The apertures of the two circulating beams are detailed for these elements, together with a summary of recent design modifications. [...]
LHC-Project-Report-753; CERN-LHC-Project-Report-753.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.572
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34.
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The Design of the New Fast Extraction Channel for the LHC
/ Borburgh, J ; Balhan, B ; Gaxiola, E ; Goddard, B ; Kadi, Y ; Uythoven, J
The Large Hadron Collider (LHC) project requires the modification of the existing extraction channel in the long straight section 6 of the CERN Super Proton Synchrotron (SPS). The new extraction will be used to transfer protons at 450 GeV/c as well as ions via the 2.8 km long transfer line TI 2 to the clockwise ring of the LHC. [...]
LHC-Project-Report-752; CERN-LHC-Project-Report-752.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.548
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35.
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Status and Plans for the SPS to LHC Beam Transfer Lines TI 2 and TI 8
/ Goddard, B ; Mertens, V ; Risselada, Thys
Beam transfer from the CERN Super Proton Synchrotron (SPS) to the Large Hadron Collider (LHC) will be done through the two transfer lines TI 2 and TI 8, presently under construction, with a combined length of about 5.6 km. The final layout, optics design and correction scheme for these lines will be presented. [...]
LHC-Project-Report-751; CERN-LHC-Project-Report-751.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.593
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36.
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Attenuation and Emittance Growth of 450 GeV and 7 TeV Proton Beams in Low-Z Absorber Elements
/ Kadi, Y ; Kain, V ; Goddard, B ; Schmidt, R
The intensity of the LHC beams will be several orders of magnitude above the damage thresholds for equipment. Passive protection of accelerator equipment against failures during beam transfer, injection and dumping of the beam with diluters and collimators is foreseen. [...]
LHC-Project-Report-750; CERN-LHC-Project-Report-750.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.581
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37.
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Detecting Failures in Electrical Circuits Leading to Very Fast Beams Losses in the LHC
/ Goddard, B ; Kain, V ; Schmidt, R ; Zerlauth, M
Failures in the powering of LHC magnets could lead to very fast beam losses at collimators, possibly within less than 10 turns. Beam loss monitors would normally detect such losses and trigger a beam dump. [...]
LHC-Project-Report-749; CERN-LHC-Project-Report-749.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.1930
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38.
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Interaction of the CERN Large Hadron Collider (LHC) Beam with Solid Metallic Targets
/ Fortov, V E ; Goddard, B ; Hoffmann, Dieter H H ; Kain, V ; Lomonosov, I V ; Piriz, A R ; Schmidt, R ; Shutov, A ; Tahir, N A ; Temporal, M
The LHC will operate at an energy of 7 TeV with a luminosity of 1034cm_2s_1. This requires two beams, each with 2808 bunches. [...]
LHC-Project-Report-748; CERN-LHC-Project-Report-748.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.641
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40.
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The Expected Performance of the LHC Injection Protection System
/ Kain, V ; Brüning, Oliver Sim ; Ducimetière, L ; Goddard, B ; Lamont, M ; Mertens, V
The passive protection devices TDI, TCDD and TCLI are required to prevent damage to the LHC in case of serious injection failures, in particular of the MKI injection kicker. A detailed particle tracking, taking realistic mechanical, positioning, injection, closed orbit and local optical errors into account, has been used to determine the required settings of the absorber elements to guarantee protection against different MKI failure modes. [...]
LHC-Project-Report-746; CERN-LHC-Project-Report-746.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.584
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