Speaker
Manabu Takechi
(Japan Atomic Energy Agency)
Description
JT-60SA, which has fully super conducting coils, is designed and now being constructed for demonstrate and develop steady-state high beta operation in order to supplement ITER toward DEMO. In order to obtain the information for the control and the physics research on JT-60SA plasma, we developed the many types of magnetic sensors. Compared to JT-60U, JT-60SA needs larger magnetic sensors and longer cable due to its bigger machine size and long port. Therefore, we have designed the magnetic sensors for JT-60SA with taking installation and maintenance into account. In order for easy installation, the connector between a sensor and mineral insulation cable (MIC) and connection box with neither welding nor brazing have been developed. When disruption occurs, a high voltage is applied to the Loop of the magnetic sensors due to change of magnetic flux. On the one hand, massive gas leads the disruption. Therefore the sensors including connection boxes have to have a withstand voltage more than 1kV in the intermediate gas pressure. We successfully increase the withstand voltage in the gas pressure region around the Paschen minimum voltage. Moreover, the newly designed sensors, Rogowski coil, diamagnetic loop and Magnetic probes have been developed. We measured frequency characteristics of these sensors. We will report the manufacturing and tests of the magnetic sensors in JT-60SA.
Co-authors
Go Matsunaga
(Japan Atomic Energy Agency, Naka, Ibaraki, Japan)
Jyunichi Yagyu
(Japan Atomic Energy Agency, Naka, Ibaraki, Japan)
Kazuo Nakamura
(RIAM, Kyushu Univ., Kasuga, Fukuoka, Japan)
Kenichi Kurihara
(Japan Atomic Energy Agency, Naka, Ibaraki, Japan)
Manabu Takechi
(Japan Atomic Energy Agency, Naka, Ibaraki, Japan)
Shinji Sakurai
(Japan Atomic Energy Agency, Naka, Ibaraki, Japan)
Tadayuki Sasajima
(Japan Atomic Energy Agency, Naka, Ibaraki, Japan)
Yoichi Kawamata
(Japan Atomic Energy Agency, Naka, Ibaraki, Japan)
