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Termodynamics Modeling of New LHC Quadrupole Magnet

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Dariusz Bocian
Updated by:
Dariusz Bocian
Document Created:
05 Nov 2009, 07:28
Contents Revised:
05 Nov 2009, 07:28
DB Info Revised:
05 Nov 2009, 07:28
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In hadron colliders such as the LHC, the energy deposited in the superconductors by the particles lost from the beams or coming from the collision debris provoke quenches detrimental for the accelerator operation. In particular, particles impacting on the vacuum chamber create showers of secondary particles hitting the magnet coils. In a previous paper, a network model has been used to study the thermodynamic behavior of magnet coils and to calculate the quench levels in the LHC magnets for expected beam loss profiles. In the so-called phase I LHC upgrade, the present inner triplet quadrupoles will be replaced with a new set of larger aperture quadrupoles of the same material (Nb-Ti). For these new magnets, a new insulation scheme aiming at a more efficient heat transport from the coil to the helium bath has been proposed. This scheme relies on leaving open helium paths between the bath and the cable. In this paper we use the thermodynamic model to compare the two insulation schemes. The detailed study of helium cooling channels efficiency and heat evacuation scheme with respect to different magnet coil setups are presented. Some conclusions are drawn on the expected quench levels.
Associated with Events:
CM13 held from 04 Nov 2009 to 06 Nov 2009 in Port Jefferson, NY
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