Title :
Testing Results for Nb-Ti, 120-mm-Aperture, Low-B Quadrupole Models for the LHC High-Luminosity Insertion
Author :
Kirby, G.A. ; Auchmann, B. ; Bajko, M. ; Charrondiere, Maryline ; Bourcey, N. ; Datskov, V.I. ; Fessia, P. ; Feuvrier, J. ; Galbraith, P. ; Garcia Tabares, A. ; Garcia-Perez, J. ; Granieri, Pier Paolo ; Hagen, P. ; Lorin, C. ; Perez, J.C. ; Russenschuck,
Author_Institution :
CERN, Geneva, Switzerland
Abstract :
The design and construction of a 120-mm wide-aperture, Nb-Ti superconducting quadrupole magnet for the Large Hadron Collider (LHC) insertion region is part of a study towards a luminosity upgrade of the LHC at CERN, envisaged for 2020-22. The main challenges for this accelerator quality magnet are to operate reliably with the high heat and radiation loads that are predicted in the insertion magnet regions. Calculations give approximately 500 Watts over the 30-m-long string of insertion magnets, while today LHC is operating for a nominal heat load of 12 Watts. To extract this heat, the model magnets incorporate new features: Open cable insulation, open ground insulation, open magnet structure, and a quench heater that has open channels to help extract the steady state heat load. This paper presents results from tests at room temperature and 1.8 K for the initial model magnet. We report magnet training, transfer function and field quality measurements, quench heater performance, and heat extraction studies using imbedded heaters to simulate the deposited beam heating profile.
Keywords :
accelerator magnets; niobium alloys; superconducting magnets; titanium alloys; LHC high-luminosity insertion; LHC luminosity upgrade; Nb-Ti low-B quadrupole models; Nb-Ti superconducting quadrupole magnet construction; Nb-Ti superconducting quadrupole magnet design; NbTi; accelerator quality magnet; beam heating profile; field quality measurements; heat extraction; initial model magnet; insertion magnet regions; insertion magnet string; large hadron collider insertion region; magnet training; nominal heat load; open cable insulation; open channels; open ground insulation; open magnet structure; power 12 W; quench heater performance; radiation load; size 120 mm; size 30 m; steady state heat load; temperature 1.8 K; temperature 293 K to 298 K; transfer function; Coils; Heating; Magnetic field measurement; Magnetic separation; Saturation magnetization; Superconducting magnets; Temperature measurement; Cold testing; HL-Large Hadron Collider (LHC); heat extraction; magnetic shimming; manufacturing process; quadrupole; quench heaters; superconducting accelerator magnets; tooling;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2013.2247453
