Performance Tests of Superconducting Combined Function Magnets in the First Full-Scale Prototype Cryostat for the J-PARC Neutrino Beam Line

Author

Sasaki, Ken-Ichi ; Kimura, Nobuhiro ; Ajima, Yasuo ; Nakamoto, Tatsushi ; Ogitsu, Toru ; Higashi, Norio ; Araoka, Osamu ; Iida, Masahisa ; Kasami, Katsuyu ; Makida, Yasuhiro ; Ohhata, Hirokatsu ; Okamura, Takahiro ; Sugawara, Shigekatsu ; Tanaka, Ken-Ichi

Author_Institution

High Energy Accelerator Res. Organ., Tsukuba

Volume

17

Issue

2

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

1255

Lastpage

1258

Abstract

The first full-scale prototype magnet system assembled with the cryostat for the J-PARC proton beam line of neutrino experiment was successfully developed and tested. Two superconducting combined function magnets have been installed into the cryostat. The magnets were successfully cooled down to 4.5 K by forced flow supercritical helium and excited up to the current of 7345 A which is the nominal current of 50 GeV proton beam. The spot heater quench test showed that the quench characteristics in the supercritical helium were very similar to that in the liquid helium at 4.2 K, 1 atm. The quench protection scheme with both cold diodes and quench protection heaters was tested, and it has been verified that the magnet can be protected with safe margin.

Keywords

cryostats; proton beams; superconducting magnets; J-PARC neutrino beam line; forced flow supercritical helium; full scale prototype cryostat; performance tests; prototype magnet system; quench protection scheme; spot heater quench test; superconducting combined function magnets; temperature 45 K; Assembly systems; Cryogenics; Diodes; Helium; Neutrino sources; Particle beams; Protection; Prototypes; Superconducting magnets; System testing; Cold diode; J-PARC; cryostat; neutrino; quench protection heater; superconducting combined function magnet system;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2007.898994

Filename

4277691