Time dependence of magnetic periodic patterns measured on the MQXA magnets for the LHC-IR

Author

Sugita, K. ; Ogitsu, T. ; Nakamoto, T. ; Ohuchi, N. ; Shintomi, T. ; Tsuchiya, K. ; Yamamoto, A.

Author_Institution

Dept. of Accel. Sci., Graduate Univ. for Adv. Studies, Ibaraki, Japan

Volume

13

Issue

2

fYear

2003

fDate

6/1/2003 12:00:00 AM

Firstpage

1317

Lastpage

1320

Abstract

Superconducting quadrupole magnets for the LHC-IR have been developed and tested by KEK in collaboration with CERN. Magnetic field measurements of the magnets were performed. The magnets satisfy the requirements for the accelerator operation. In addition to the field quality measurements, fine structures of the magnetic field along the magnet axis were measured at the beam injection current using a 25 mm long rotating harmonic coil. Periodic patterns of the magnetic field were observed in higher order multipole coefficients. The pitch of the periodic patterns is equal to the cable twist pitch. The time dependent change of the amplitude of the periodic pattern was also observed. In this paper, the measurement and results are reported.

Keywords

accelerator magnets; colliding beam accelerators; storage rings; superconducting magnets; LHC-IR accelerator; MQXA magnet; magnetic field; multipole coefficient; periodic pattern; superconducting quadrupole magnet; time dependence; Accelerator magnets; Coils; Collaboration; Current measurement; Magnetic field measurement; Performance evaluation; Rotation measurement; Superconducting magnets; Testing; Time measurement;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2003.812661

Filename

1211840