EAST等离子体启动.pptVIP

EAST等离子体启动 肖炳甲 2009/02/23 Plasma Startup: 击穿和建立、电流上升、成形 物理问题 低环电压breakdown 降低磁体端电压、减小磁通消耗和降低逃逸 上升段电流、位置、位形的控制 磁场、平衡重建, 导体间的耦合，等离子体模型，真空室的三维结构的影响… 电流上升与不稳定性的关系，Profile控制, operation limits 击穿与初始上升实现 PF/PS系统 ＝》合适的欧姆场和垂直场 充气 ＝》在合适的时间内合适的气体压力 Wall conditioning = Low impurities Pre-ionization aided by ICRF or LHW Enough seed electrons in longer duration to meet the Townsend Avalanche in a not well-controlled stray field and Loop Voltage. RF heating aiding to overcome radiation barrier IP**2*R + Paux Etransport + Eradiation 基本模型 系统构成： PF线圈 PF电源及电阻 真空室及被动结构 击穿后，等离子体 模型方程 线圈系统 * * 线圈系统： PF互感 * * 快控： 被动结构 ASIPP Parameters of PF Power Supply ? ? Coil No. Rated current (kA) Max. voltage (kV) load steady voltage (V) R1 (R2) (mΩ) PS1 1 -14.5~ 14.5 1.2 280 150 PS2 2 -14.5~ 14.5 1.2 280 150 PS3 3 -14.5~ 14.5 1.2 280 150 PS4 4 -14.5~ 14.5 1.2 280 150 PS5 5 -14.5~ 14.5 1.2 280 150 PS6 6 -14.5~ 14.5 1.2 280 150 PS7 7 ,9 -14.5~ 14.5 2.4 560 150 PS8 8,10 -14.5~ 14.5 2.4 560 150 PS9 11 -14.5~ 14.5 0.6 280 150 PS10 12 -14.5~ 14.5 0.6 280 150 PS11 13 -14.5~ 14.5 0.26 160 1500 PS12 14 -14.5~ 14.5 0.26 160 1500 Note: (1) Coil 7 and Coil 9 is in series, they share one power supply, same as Coil 8 and Coil 10. (2)?? ?? Max. Voltage is only used as plasma initiation and fast rising. R1 =R2, it is designed according to the plasma scenario some years ago. They (PS1—PS10) can be respectively changed from zero to above value in step 7.5mΩ, Other (PS11—PS12 ) is in step 50mΩ . EAST 等离子体控制中的电磁测量 * * 极向场线圈电流(Rowgowski)：12 等离子体电流(Rogowski, in-/ex-vessel) ：2 磁通环：37 磁探针：38 内部线圈电流：1 控制目标： R ~ 1.8, a~0.4 Ip ~ 0.5 MA (1 MA, 1.5MA) delta 0.3-0.6 k ~ 1.5 – 2.0 DN/SN 击穿条件 1. Tanga et al., in Tokamak Startup 2. Lloyd B et al., Nucl Fusion 31 For EAST: MPF-IP~3Vs/8kA, dI/dtmax=20 kA/s so Vmax=MdI/dtmax~ 7.5 V E~6 V/2PiR~0.5 V/m (0.7 for JET， 0.3 for ITER)