The MQXA quadrupoles for the LHC low-beta insertions

Authors :: Ajima, Y.
Higashi, N.
Iida, M.
Kimura, N.
Nakamoto, T.
Ogitsu, T.
Ohhata, H.
Ohuchi, N.
Shintomi, T.
Sugawara, S.
Sugita, K.
Tanaka, K.
Taylor, T.
Terashima, A.
Tsuchiya, K.
Yamamoto, A.
Source :: Nuclear Instruments & Methods in Physics Research Section A. Sep2005, Vol. 550 Issue 3, p499-513. 15p.
Publication Year :: 2005
Abstract: Abstract: High-performance superconducting quadrupole magnets, MQXA, for the LHC low-beta insertions have been designed, manufactured in series and tested. The design field gradient of the quadrupole, which has a coil aperture of diameter 70mm, was 240T/m at 1.9K; its effective length is 6.37m, and it is required to operate reliably at up to 215T/m when subjected to radiation heat deposit in the coils of up to 5W/m. The series of 20 magnets has been produced in industry, and tested at KEK. The magnet design is explained, and the construction and performance of the series units, in terms of training, field quality and geometry, are presented. [Copyright &y& Elsevier]