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Kashikhin, V.

Paper Title Page
WEPKF073 2nd Generation LHC IR Quadrupoles Based on Nb3Sn Racetrack Coils 1774
 
  • V. Kashikhin, J. Strait, A.V. Zlobin
    Fermilab, Batavia, Illinois
  
  After the LHC operates for several years at nominal parameters, it will be necessary to upgrade it for higher luminosity. Replacing the baseline NbTi low-beta quadrupoles with a higher performance magnets based on advanced superconducting materials and magnet technologies is one of the most straightforward ways in this direction. Preliminary studies show that high-performance Nb3Sn strands to be available within the next few years allow increasing the quadrupole aperture up to 110 mm using a 4-layer shell-type coil and providing the same 200 T/m field gradient with 20% margin as the baseline magnets. It will allow reduction of b* by a factor of 3. An alternative approach to the quadrupole design is based on simple flat racetrack coils. This paper discusses the possibilities and limitations of large-aperture racetrack quadrupole designs and compares them to the shell-type magnets.  
WEPKF074 Magnetic Field Measurements of the LHC Inner Triplet Quadrupoles Produced at Fermilab 1777
 
  • G. Velev, R. Bossert, R. Carcagno, J. DiMarco, S. Feher, H. Glass, V. Kashikhin, J.S. Kerby, M. Lamm, T. Nicol, L. Nobrega, D. Orris, T. Page, T. Peterson, R. Rabehl, P. Schlabach, J. Strait, C. Sylvester, M. Tartaglia, J. Tompkins, A.V. Zlobin
    Fermilab, Batavia, Illinois
  
  Production of 18 superconducting low-beta quadrupoles (MQXB) for the LHC is well advanced. These 5.5 m long magnets are designed to operate at 1.9 K with a peak field gradient of 215 T/m in the 70 mm apertures. Two MQXB cold masses with a dipole orbit corrector between them form a single cryogenic unit (LQXB) which is the Q2 optical element of the final focus triplets in the LHC interaction regions. A program of magnetic field quality and alignment measurements of the cold masses are performed at room temperature during magnet fabrication and LQXB assembly as well as at superfluid helium temperature. Results of these measurements are summarized in this paper.