Speaker
Md Mahbub Alam
(Advanced Energy Engineering Science)
Description
In QUEST (Q-shu University Experiments with Steady-State Spherical Tokamak), the achievement of the steady-state operation for long time discharge is one of its project objectives. For the achievement of the long time discharge, the identification of the plasma shape and position in real-time is important during the operation of the tokamak. By observing the temporal behaviours of the plasma shape and position in real-time, the experimenters can get indications about what measures should be taken to achieve long time discharge on QUEST.
In order to accomplish this goal, novel, efficient and precise real-time display system for plasma shaping and position monitor is going to develop on QUEST for the observation of the continuous behaviours of the plasma that is produced inside the vacuum vessel. For the remote participation to the experiments, the display system will have subsystem that can record the entire display frame of the display system as video files and recorded video files are accessible through online during the operation of the tokamak. In addition, the display system will have an emergency safety notification system to alarm the occurrences of any abnormal situations.
For the construction of an effective real-time display system, precise and accurate data acquisitions from the magnetic measurements should be ensured for long time discharge. The magnetic signals of flux loops, magnetic probes and rogowski coils usually obtained as numerical integration of raw signals which are affected a critical drift error. This drift error should be removed from the acquired magnetic signals. The field-programmable gate array (FPGA) based reconfigurable real-time data acquisition module can be the solutions for acquiring magnetic signals. On the other hand, hall sensors may be the suitable candidate for accurate and precise data acquisitions from the magnetic measurements. Drift errors do not occur with hall sensors also in long-pulse operation.
Co-authors
Aki Higashijima
(RIAM, Kyushu University, 6-1, Kasuga-koen, Kasuga-shi, Fukuoka, Japan)
Akihide Fujisawa
(RIAM, Kyushu University, 6-1, Kasuga-koen, Kasuga-shi, Fukuoka, Japan)
Hiroshi Idei
(RIAM, Kyushu University, 6-1, Kasuga-koen, Kasuga-shi, Fukuoka, Japan)
Hisatoshi Nakashima
(RIAM, Kyushu University, 6-1, Kasuga-koen, Kasuga-shi, Fukuoka, Japan)
Kazuaki Hanada
(RIAM, Kyushu University, 6-1, Kasuga-koen, Kasuga-shi, Fukuoka, Japan)
Kazuo Nakamura
(RIAM, Kyushu University, 6-1, Kasuga-koen, Kasuga-shi, Fukuoka, Japan)
Kazutoshi Tokunaga
(RIAM, Kyushu University, 6-1, Kasuga-koen, Kasuga-shi, Fukuoka, Japan)
Kuniaki Araki
(RIAM, Kyushu University, 6-1, Kasuga-koen, Kasuga-shi, Fukuoka, Japan)
Makoto Hasegawa
(RIAM, Kyushu University, 6-1, Kasuga-koen, Kasuga-shi, Fukuoka, Japan)
Md Mahbub Alam
(Advanced Energy Engineering Science, IGSES, Kyushu University, 6-1, Kasuga-koen, Kasuga-shi, Fukuoka, Japan)
Osamu Mitarai
(Tokai University, Kumamoto, 862-8652, Japan)
Shoji Kawasaki
(RIAM, Kyushu University, 6-1, Kasuga-koen, Kasuga-shi, Fukuoka, Japan)
Takahiro Nagata
(RIAM, Kyushu University, 6-1, Kasuga-koen, Kasuga-shi, Fukuoka, Japan)
Yoshihiko Nagashima
(RIAM, Kyushu University, 6-1, Kasuga-koen, Kasuga-shi, Fukuoka, Japan)
