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在有预电离、空芯变压器功率续流、真空室放电清洗、碳化和蒸钛的条件下,获得了反场箍缩(RFP)和超低安全因子q(ULQ)位形。等离子体性质得到了改善,等离子体电流出现平顶,其电流的幅值增加。杂质得到有效的控制,并在充分控制壁的条件下等离子体温度有所增加。不但得到稳定约束RFP位形,而且在不同q值运行条件下也得到稳定的、驰豫的ULQ放电。在ULQ放电时随着等离子体电流的上升,出现由于发电机效应(dynamo)所引起的环向磁通增长。
Anti-field pinch (RFP) and ultra-low safety factor q (ULQ) configurations were obtained with pre-ionization, free-wheeling power freewheeling, vacuum chamber discharge cleaning, carbonization and steaming of titanium. Plasma properties have been improved, the plasma current appears flat top, the current amplitude increases. The impurities are effectively controlled and the plasma temperature increases with adequate wall control. Not only stable constrained RFP configuration but also stable and relaxed ULQ discharge under different q values. As the plasma current increases during ULQ discharge, the hoop flux increases due to the dynamo effect.