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2006_EPAC
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1.
Design, Manufacturing and Integration of LHC Cryostat Components : an Example of Collaboration between CERN and Industry / Slits, Ivo (CERN) ; Bourcey, Nicolas (CERN) ; Canetti, Marco (RIAL VACUUM S.p.A, Parma) ; Colombet, Thierry (CERN) ; Gangini, Fabrizio (RIAL VACUUM S.p.A, Parma) ; Parma, Vittorio (CERN) ; Tock, Jean-Philippe (CERN)
The components for the LHC cryostats and interconnections are supplied by European industry. The manufacturing, assembly and testing of these components in accordance with CERN technical specifications require a close collaboration and dedicated approach from the suppliers. [...]
LHC-PROJECT-Report-959; CERN-LHC-Project-Report-959.- Geneva : CERN, 2006 - 6 p. Access to fulltext document: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.3191
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2.
The Field Description Model for the LHC Quadrupole Superconducting Magnets / Sammut, N ; Bottura, L ; Micallef, J ; Sanfilippo, S
The LHC control system requires an accurate forecast of the magnetic field and the multipole field errors to reduce the burden on the beam-based feed-back. The Field Description for the LHC (FIDEL) is the core of this forecast system and is based on the identification and physical decomposition of the effects that contribute to the total field in the magnet apertures. [...]
LHC-PROJECT-Report-958; CERN-LHC-Project-Report-958.- Geneva : CERN, 2006 - 4 p. Access to fulltext document: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.2619
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3.
Measurement and Modeling of Magnetic Hysteresis in the LHC Superconducting Correctors / Venturini-Delsolaro, W ; Bottura, L ; Chaudhari, Y ; Karppinen, M ; Sammut, N
The Large Hadron Collider, now under construction at CERN, relies heavily on superconducting magnets for its optics layout: besides the main magnets, almost all the correcting magnets are superconducting. Along with clear advantages, this brings about complications due to the effects of persistent currents in the superconducting filaments. [...]
LHC-PROJECT-Report-957; CERN-LHC-Project-Report-957.- Geneva : CERN, 2006 - 4 p. Access to fulltext document: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.2026
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4.
The Dependence of the Field Decay on the Powering History of the LHC Superconducting Dipole Magnets / Sammut, N ; Bottura, L ; Micallef, J ; Sanfilippo, S
The decay of the allowed multipoles in the Large Hadron Collider (LHC) dipoles is expected to perturb the beam stability during the particle injection. The decay amplitude is largely affected by the powering history of the magnet and is particularly dependent on the pre-cycle flat-top current and duration as well as the pre-injection preparation duration. [...]
LHC-PROJECT-Report-956; CERN-LHC-Project-Report-956.- Geneva : CERN, 2006 - 4 p. Access to fulltext document: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.2622
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5.
Design, Performance and Series Production of Superconducting Trim Quadrupoles for the Large Hadron Collider / Karppinen, M ; Boyer, C ; Castro, J-M ; Gaggero, G ; Giloux, C ; Lopes, H ; Khare, P ; Loche, L ; Mazet, J ; Mugnai, G et al.
The Large Hadron Collider (LHC) will be equipped with several thousands of superconducting corrector magnets. Among the largest ones are the superconducting trim quadrupoles (MQTL). [...]
LHC-PROJECT-Report-969; CERN-LHC-Project-Report-969.- Geneva : CERN, 2006 - 4 p. Access to fulltext document: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.2628
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6.
Installation and Quality Assurance of the Interconnections between Cryo-assemblies of the LHC Long Straight Sections / Garion, C ; Slits, I ; Tock, J P
The interconnections between the cryomagnets and cryogenic utilities in the LHC long Straight Sections constitute the last machine installation activity. They are ensuring continuity of the beam and insulation vacuum systems, cryogenic fluid and electrical circuits and thermal insulation. [...]
LHC-PROJECT-Report-968; CERN-LHC-Project-Report-968.- Geneva : CERN, 2006 - 4 p. Access to fulltext document: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.3227
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7.
Copper Heat Exchanger for the External Auxiliary Bus-Bars Routing Line in the LHC Insertion Regions / Garion, C ; Poncet, A ; Seyvet, F ; Sitko, M ; Skoczen, B ; Tock, J P
The corrector magnets and the main quadrupoles of the LHC dispersion suppressors are powered by a special superconducting line (called auxiliary bus-bars line N), external to the cold mass and housed in a 50 mm diameter stainless steel tube fixed to the cold mass. As the line is periodically connected to the cold mass, the same gaseous and liquid helium cools both the magnets and the line. [...]
LHC-PROJECT-Report-967; CERN-LHC-Project-Report-967.- Geneva : CERN, 2006 - 4 p. Access to fulltext document: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.508
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8.
H2 Equilibrium Pressure with a Neg-Coated Vacuum Chamber as a Function of Temperature and H2 Concentration / Rossi, Adriana (CERN)
Non Evaporable Getter (NEG) coating is used in the Large Hadron Collider (LHC) room-temperature sections to ensure a low residual gas pressure for its properties of distributed pumping, low outgassing and desorption under particle bombardment; and to limit or cure electron cloud build-up due to its low secondary electron emission. In certain regions of the LHC, and in particular close to the beam collimators, the temperature of the vacuum chamber is expected to rise due to energy deposition from particle losses. [...]
LHC-PROJECT-Report-966; CERN-LHC-Project-Report-966.- Geneva : CERN, 2006 - 4 p. Access to fulltext document: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.1444
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9.
Design of the LHC Beam Dump Entrance Window / Veness, R ; Goddard, B ; Massidda, L ; Mathot, S J ; Presland, A
7 TeV proton beams from the LHC are ejected through a 600 m long beam dump transfer line vacuum chamber to a beam dump block. The dump block is contained within an inert gas-filled vessel to prevent a possible fire risk. [...]
LHC-PROJECT-Report-965; CERN-LHC-Project-Report-965.- Geneva : CERN, 2006 - 4 p. Access to fulltext document: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.1792
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10.
Quality Control Techniques Applied to the Large Scale Production of Superconducting Dipole Magnets for LHC / Savary, F ; Bajko, M ; Beauquis, J ; Emelianenko, N ; Fessia, P ; Hagen, P ; Miles, J ; de Rijk, G ; Rossi, L ; Todesco, E et al.
The LHC accelerator, under construction at CERN, is characterized by the use on a large scale of high field superconducting dipoles: the 27-km ring requires 1232 15-m long dipole magnets designed for a peak field of 9 T. The coils are wound with Rutherford-type cable based on copper-stabilized Nb-Ti superconductors and will be operated at 1.9 K in pressurized superfluid helium. [...]
LHC-PROJECT-Report-964; CERN-LHC-Project-Report-964.- Geneva : CERN, 2006 - 4 p. Access to fulltext document: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.568
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11.
Fault Detection and Identification Methods Used for the LHC Cryomagnets and Related Cabling / Bozzini, D ; Caspers, Friedhelm ; Chareyre, V ; Duse, Y ; Kroyer, T ; López, R ; Poncet, A ; Russenschuck, Stephan
Several methods for electrical fault location have been developed and tested. As part of the electrical quality assurance program for the LHC, certain wires have to be subjected to a (high) DC voltage for the testing of the insulation. [...]
LHC-PROJECT-Report-963; CERN-LHC-Project-Report-963.- Geneva : CERN, 2006 - 4 p. Access to fulltext document: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.2607
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12.
Experience with the Quality Assurance of the Superconducting Electrical Circuits of the LHC Machine / Bozzini, D ; Chareyre, V ; Kotarba, A ; Mess, Karl Hubert ; Olek, S ; Russenschuck, Stephan
The coherence between the powering reference database for the LHC and the Electrical Quality Assurance (ELQA) is guaranteed on the procedural level. However, a challenge remains the coherence between the database, the magnet test and assembly procedures, and the connection of all superconducting circuits in the LHC machine. [...]
LHC-PROJECT-Report-962; CERN-LHC-Project-Report-962.- Geneva : CERN, 2006 - 4 p. Access to fulltext document: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.2604
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13.
The Construction of the Superconducting Matching Quadrupoles for the LHC Insertions / Ostojic, R ; Canard, P ; Catalán Lasheras, N ; Kirby, G ; Perez, JC ; Prin, H ; Venturini-Delsolaro, W
After several years of effort, the construction of the superconducting matching quadrupoles for the LHC insertions is nearing completion. We retrace the main events of the project from the initial development of the quadrupole magnets of several types to the series production of over 100 complex superconducting magnets, and report on the techniques developed for steering of the production. [...]
LHC-PROJECT-Report-961; CERN-LHC-Project-Report-961.- Geneva : CERN, 2006 - 4 p. Access to fulltext document: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.2616
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14.
Design, Construction, Installation and First Commissioning Results of the LHC Cryogenic System / Claudet, S
The cryogenic system of the Large Hadron Collider (LHC) will be, upon its completion in 2006, the largest in the world in terms of refrigeration capacity with an equivalent to 144 kW at 4.5 K, about 400'000 litres of superfluid helium with 25 km of superconducting magnets below 2 K leading to a cryogen inventory of 100 tons of helium. The challenges involved in the design, construction and installation, as well as the first commissioning results will be addressed in this talk. [...]
LHC-PROJECT-Report-960; CERN-LHC-Project-Report-960.- Geneva : CERN, 2006 - 6 p. Access to fulltext document: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.3626
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15.
First Computation of Parasitic Fields in LHC Dipole Magnet Interconnects / Devred, Arnaud ; Auchmann, Bernard ; Boncompagni, Yann ; Ferapontov, V ; Koutchouk, Jean-Pierre ; Russenschuck, Stephan ; Sahner, T ; Völlinger, C
The Large Hadron Collider (LHC), now under construction at CERN, will rely on about 1600 main superconducting dipole and quadrupole magnets and over 7400 superconducting corrector magnets distributed around the eight sectors of the machine. Each magnet type is powered by dedicated superconducting busbars running along the sectors and mounted on the iron yokes of the main dipole and quadruple magnets. [...]
LHC-PROJECT-Report-978; CERN-LHC-Project-Report-978.- Geneva : CERN, 2006 - 4 p. Access to fulltext document: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.2613
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16.
Performance of the LHC Arc Superconducting Quadrupoles Towards the End of their Series Fabrication / Tortschanoff, Theodor ; Burgmer, R ; Durante, M ; Hagen, P ; Klein, U ; Krischel, D ; Modena, M ; Payn, A ; Rossi, L ; Sanfilippo, S et al.
The fabrication of the 408 main arc quadrupole magnets and their cold masses will come to an end in summer 2006. A rich collection of measurement and test data has been accumulated and their analysis is presented in this paper. [...]
LHC-PROJECT-Report-977; CERN-LHC-Project-Report-977.- Geneva : CERN, 2006 - 4 p. Access to fulltext document: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.2625
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17.
Preliminary Study of Using "Pipetron-type" Magnets for a Pre-accelerator for the LHC / De Rijk, Gijsbert (CERN) ; Piekarz, Henryk (Fermilab) ; Rossi, Lucio (CERN) /FP6 Collaboration
One of the luminosity limitations of the LHC is the rather low injection energy (0.45 TeV) with respect to the collision energy (7 TeV). The magnetic multipoles in the main dipoles at low field and their dynamic behaviour are considered to limit the achievable bunch intensity and emittance. [...]
LHC-PROJECT-Report-976; CERN-LHC-Project-Report-976.- Geneva : CERN, 2006 - 4 p. Access to fulltext document: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.1493
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18.
LHC Luminosity and Energy Upgrade / Scandale, Walter (CERN) /FP6 Collaboration
LHC upgrade studies are ongoing as part of the EU CARE-HHH and of the US-LARP programmes. The aim is a ten-fold increase of the LHC luminosity by the middle of next decade, a possible upgrade of the injector complex to inject at 1 TeV and, at a later stage, to raise the collider energy. [...]
LHC-PROJECT-Report-975; CERN-LHC-Project-Report-975; CARE-Conf-06-022-HHH; CARE-Conf-2006-022-HHH.- Geneva : CERN, 2006 - 6 p. Access to fulltext document: PDF; Fulltext: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.910
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19.
Performance of LHC Main Dipoles for Beam Operation / De Rijk, Gijsbert (CERN) ; Bajko, Marta (CERN) ; Bottura, Luca (CERN) ; Buzio, Marco Carlo Luigi (CERN) ; Chohan, Vinod (CERN) ; Deniau, Laurent (CERN) ; Fessia, Paolo (CERN) ; García-Pérez, Juan (CERN) ; Hagen, Per (CERN) ; Koutchouk, Jean-Pierre (CERN) et al.
At present about 90% of the main dipoles for the LHC have been manufactured and one of the three cold mass assemblers has already completed the production. 85% of the 1232 dipoles needed for the tunnel have been tested and accepted. [...]
LHC-PROJECT-Report-974; CERN-LHC-Project-Report-974.- Geneva : CERN, 2006 - 4 p. Access to fulltext document: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.2610
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20.
Investigations of the Parameter Space for the LHC Luminosity Upgrade / Koutchouk, Jean-Pierre
Increasing the LHC luminosity by a factor of ten is a major challenge, especially for the beam-beam long-range interactions and even more for the magnet technology and insertion layout. To help identifying consistent solutions in this multi-dimensional constrained space, a parametric model of an LHC insertion was prepared, based on the present LHC layout, i.e. [...]
LHC-PROJECT-Report-973; CERN-LHC-Project-Report-973; CARE-Conf-06-034-HHH; CARE-Conf-2006-034-HHH.- Geneva : CERN, 2006 - 4 p. Access to fulltext document: PDF; Fulltext: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.556
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21.
An Early Beam Separation Scheme for the LHC Luminosity Upgrade / Koutchouk, Jean-Pierre ; Sterbini, G
The high nominal luminosity of the LHC requires a large number of bunches spaced by about 7.5 m. To prevent more than one head-on collision in each interaction region, a crossing angle of 0.285 mrad is necessary. [...]
LHC-PROJECT-Report-972; CERN-LHC-Project-Report-972; CARE-Conf-06-033-HHH; CARE-Conf-2006-033-HHH.- Geneva : CERN, 2006 - 4 p. Access to fulltext document: PDF; Fulltext: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.2134
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22.
WISE : An Adaptative Simulation of the LHC Optics / Hagen, P ; Giovannozzi, Massimo ; Koutchouk, Jean-Pierre ; Risselada, Thys ; Sanfilippo, S ; Todesco, E ; Wildner, E
The beam dynamics in LHC requires a tight control of the field quality and geometry of the magnets. As the production advances, decisions have to be made on the acceptance of possible imperfections. [...]
LHC-PROJECT-Report-971; CERN-LHC-Project-Report-971.- Geneva : CERN, 2006 - 4 p. Access to fulltext document: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.2248
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23.
Interaction Region with Slim Quadrupoles / Laface, E ; Ostojic, R ; Santoni, C ; Scandale, Walter ; Tommasini, D /FP6 Collaboration
An optical performance's improvement of the interaction region can be obtained with the addition of new quadrupoles in the forward detectors area. Such scenario would allow decreasing the ß* below the nominal value.The basic concept consists in using quadrupoles to break the quadratic behavior of ß in the free space between the IP and the IR triplets.I In this new configuration we present the performance improvements and the hardware requirements..
LHC-PROJECT-Report-970; CERN-LHC-Project-Report-970; CARE-Conf-06-035-HHH; CARE-Conf-2006-035-HHH.- Geneva : CERN, 2006 - 4 p. Access to fulltext document: PDF; Fulltext: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.2014
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24.
Comparative Study of Inter-Strand Coupling Current Models for Accelerator Magnets / Auchmann, Bernard ; de Maria, Riccardo ; Russenschuck, Stephan
Inter-strand coupling currents (ISCCs) contribute to field errors and losses in Rutherford-type superconducting cables in the time-transient regime. A field change induces eddy currents in loops formed by the superconducting twisted strands and the resistive matrix. [...]
CERN-AT-2006-011-MEL.- Geneva : CERN, 2006 - 4 p. Access to fulltext document: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.2631
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25.
Random Errors in Superconducting Dipoles / Bellesia, B ; Santoni, C ; Todesco, E
The magnetic field in a superconducting magnet is mainly determined by the position of the conductors. Hence, the main contribution to the random field errors comes from random displacement of the coil with respect to its nominal position. [...]
CERN-AT-2006-010-MAS.- Geneva : CERN, 2006 - 4 p. Access to fulltext document: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.2601
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26.
Experimental Study of Crystal Channelling at CERN-SPS for Beam-Halo Cleaning / FP6 Collaboration
An efficient and robust collimation system is mandatory for any superconducting hadron collider, in particular for the LHC, which will store a beam of unprecedented high intensity and energy. The usage of highly efficient and short primary bent-crystal collimators might be a possibility for reaching nominal and ultimate LHC intensity. [...]
CERN-AT-2006-009-MAS.- Geneva : CERN, 2006 - 4 p. Access to fulltext document: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.1538
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27.
Characterization of Crystals for Steering of Protons through Channelling in Hadronic Accelerators / FP6 Collaboration
Channeling of relativistic particles through a crystal may be useful for many applications in accelerators, and particularly for collimation in hadronic colliders. Efficiency proved to be dependent on the state of the crystal surface and hence on the method used for preparation. [...]
CERN-AT-2006-008-MAS.- Geneva : CERN, 2006 - 4 p. Access to fulltext document: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.1523
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28.

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29.
Consolidation of the 45-Year Old PS Main Magnet System / Zickler, Thomas (CERN) ; Bodart, Dominique (CERN) ; Kalbreier, Wilhelm (CERN) ; Mess, Karl Hubert (CERN) ; Newborough, Antony (CERN)
After a major coil insulation breakdown on two of the 47-year-old CERN PS main magnets in 2003, an extensive magnet consolidation program has been launched. This article reviews the analysis of the magnet state be-fore the repair and the applied major improvements. [...]
CERN-AT-2006-006-MEL.- Geneva : CERN, 2006 - 4 p. Access to fulltext document: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.2571
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