@misc{oai:repo.qst.go.jp:00072828,
 author = {福井, 良磨 and 神谷, 宏治 and 夏目, 恭平 and 木津, 要 and 河野, 勝己 and 礒野, 高明 and 村上, 陽之 and 土屋, 勝彦 and Heller, (Karlsruhe Institute of Technology) Reinhard and 福井 良磨 and 神谷 宏治 and 夏目 恭平 and 木津 要 and 河野 勝己 and 礒野 高明 and 村上 陽之 and 土屋 勝彦},
 month = {Sep},
 note = {The construction of the full-superconducting tokamak JT-60 Super Advanced (JT-60SA) is
in progress under the JA-EU broader approach agreement. During cool down, nominal operation and
warm-up the thermal shields, the superconducting magnets and their structures, the high temperature
superconductor current leads (HTS CL) and the divertor cryo pumps have to be supplied with helium
at specific flow rates, pressures and temperatures. The monitoring of temperatures, mass flows, and
pressures and the control of the helium flows is performed by a Magnet Controller (MC).
A particular abnormal situation is a quench or a fast discharge of a magnet which would
require many hours for recovery to normal operation. In order to avoid fast discharges as far as possible,
the MC uses “safety interlocks” to supervise the magnet coils and the HTS CL. These interlocks react
on deviations of temperatures, pressures or mass flow rates from their nominal values and initiate
appropriate counteractions. If a state reaches a critical threshold, a normal stop (NS) of a magnet is
initiated through the “Supervisory Control System and Data Acquisition System” (SCSDAS) by
ramping-down the current in the coils. In case of a fast discharge the MC acts directly on the power
supplies with parallel information to the SCSDAS.
The thresholds are derived from simulations of the cryogenic loops using the thermal
analysis programs FLOWER, HEATER, and SUPERMAGNET.
The presentation will describe the philosophy and logic of the Magnet Controller and explain the
calculation of some thresholds., 30th Symposium on Fusion Technology (SOFT 2018)},
 title = {Monitoring and Control of the Magnet System of JT-60SA},
 year = {2018}
}