HL-1装置密度极限破裂分析  

ANALYSIS OF DENSITY LIMIT DISRUPTIONS IN THE HL-1 DEVICE

作　　者：严龙文[1] 冉利波[1] 邓中朝[1] 

机构地区：[1]核工业西南物理研究院

出　　处：《核聚变与等离子体物理》1992年第2期65-70,共6页Nuclear Fusion and Plasma Physics

摘　　要：HL-1装置上观测到大量的密度极限破裂放电。其主要特性是破裂前偏离几何中心的磁面位移很小,中心区总是观测到锯齿现象,破裂后,其电流中断时间大于20ms。本文详细分析了出现在电流上升段,坪段及下降段密度极限破裂的特征。其中一类是由于辐射功率超过加热功率所确定的村上极限,没有观测到先兆振荡;另一类是由于约束变坏所确定的赫吉尔极限,可观测到驰豫几毫秒的先兆振荡,这类放电破裂后多数能恢复。该装置运行的最大村上参数是0.35×10^(20)m^(-2).T^(-1)。Density limit disruptions have been observed in the HL-1 device. The characteristics are that the displacement of the magnetic surface toward the vacuum vessel is very small and sawteeth always exist before disruption. After disruption, the current drops partly or wholly, and the dropping time is about 20ms.In this paper, we carefully analyze the characteristics of density limit disruptions during current ramp-up, flattop and ramp down phases.One of these limits is the Murakami limit which has no precursor and the plasma energy quenches in-0.1ms. The disruption first takes place at the side of strong magnetic field. Another is the Hugill limit which has precusors relaxed for several milliseconds. The reason is that the radiation changes the profile of temperature and current density, and then excites MHD instability. Most discharges can recover from the disruption. The maximum Murakami parameter is 0.35×1020m-2·T-1 in the HL-1 device.

关 键 词：密度极限破裂 磁流体 HL-1装置 

分 类 号：TL631.24[核科学技术—核技术及应用]