Fast plasma shutdown by killer pellet injection in JT-60U with reduced heat flux on the divertor plate and avoiding runaway electron generation

被引:98
作者
Yoshino, R
Kondoh, T
Neyatani, Y
Itami, K
Kawano, Y
Isei, N
机构
[1] Department of Fusion Plasma Research, Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, Naka-gun, Ibaraki-ken, Naka-machi
关键词
D O I
10.1088/0741-3335/39/2/008
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
A killer pellet is an impurity pellet that is injected into a tokamak plasma in order to terminate a discharge without causing serious damage to the tokamak machine. In JT-60U neon ice pellets have been injected into OH and NE heated plasmas and fast plasma shutdowns have been demonstrated without large vertical displacement. The heat pulse on the divertor plate has been greatly reduced by killer pellet injection (KPI), but a low-power heat flux tail with a long time duration is observed. The total energy on the divertor plate increases with longer heat flux tail, so it has been reduced by shortening the tail. Runaway electron (RE) generation has been observed just after KPI and/or in the Inter phase of the plasma current quench. However, RE generation has been avoided when large magnetic perturbations are excited. These experimental results clearly show that KPI is a credible fast shutdown method avoiding large vertical displacement, reducing heat flux on the divertor plate, and avoiding (or minimizing) RE generation.
引用
收藏
页码:313 / 332
页数:20
相关论文
共 25 条
[1]   MHD MODELING OF DENSITY LIMIT DISRUPTIONS IN TOKAMAKS [J].
BONDESON, A ;
PARKER, RD ;
HUGON, M ;
SMEULDERS, P .
NUCLEAR FUSION, 1991, 31 (09) :1695-1716
[2]  
FUSSMANN G, 1979, PLASMA PHYS CONTROLL, V1, P401
[3]   GENERATION AND LOSS OF RUNAWAY ELECTRONS FOLLOWING DISRUPTIONS IN JET [J].
GILL, RD .
NUCLEAR FUSION, 1993, 33 (11) :1613-1625
[4]  
Gruber O, 1993, PLASMA PHYS CONTRO B, V35, pB191
[5]   DYNAMIC MODELING OF TRANSPORT AND POSITIONAL CONTROL OF TOKAMAKS [J].
JARDIN, SC ;
POMPHREY, N ;
DELUCIA, J .
JOURNAL OF COMPUTATIONAL PHYSICS, 1986, 66 (02) :481-507
[6]   PHOTONEUTRON PRODUCTION ACCOMPANYING PLASMA DISRUPTIONS IN JET [J].
JARVIS, ON ;
SADLER, G ;
THOMPSON, JL .
NUCLEAR FUSION, 1988, 28 (11) :1981-1993
[7]  
KAWANO Y, 1996, 16 IAEA FUS EN C MON
[8]  
KONDOH T, 1997, UNPUB NUCL FUSION
[9]   EMERGENCY DISCHARGE QUENCH OR RAMPDOWN BY A NOBLE-GAS PELLET [J].
KUTEEV, BV ;
SERGEEV, VY ;
SUDO, S .
NUCLEAR FUSION, 1995, 35 (10) :1167-1172
[10]   INVESTIGATION OF PLASMA-FACING COMPONENTS IN JT-60U OPERATION [J].
MASAKI, K ;
ANDO, T ;
KODAMA, K ;
ARAI, T ;
NEYATANI, Y ;
YOSHINO, R ;
TSUJI, S ;
YAGYU, J ;
KAMINAGA, A ;
SASAJIMA, T ;
OUCHI, Y ;
KOIKE, T ;
SHIMIZU, M .
JOURNAL OF NUCLEAR MATERIALS, 1995, 220 :390-394