Title :
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
fDate :
6/1/2007 12:00:00 AM
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;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2007.898994
