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首页> 外文期刊>Physics of plasmas >The magnitude of sawtooth crash events in multiple and quasi-single helicity states in a reversed-field-pinch plasma
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The magnitude of sawtooth crash events in multiple and quasi-single helicity states in a reversed-field-pinch plasma

机译：反向场捏等离子体中多个和半单个螺旋状态下的锯齿形碰撞事件的大小

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Factors affecting the magnitude of sawtooth crashes in soft x-ray (SXR) signals (I-SXR) have been studied using data from high-Theta (pinch parameter) discharges in the toroidal pinch experiment TPE-1RM20 reversed-field pinch device [Y. Yagi , J. Plasma Fusion Research 69, 700 (1993)]. In TPE-1RM20, discharges with a high Theta that are free of large sawteeth (improved high-Theta mode discharges), spontaneously appeared [Y. Hirano , Nucl. Fusion 36, 721 (1996)] among typical conventional discharges exhibiting large sawtooth crashes. The reason for the spontaneous appearance of sawtooth-free discharges has been unclear. It is shown that the normalized magnitude of the SXR crashes, [Delta(I-SXR)/I-SXR], is well correlated with the m (poloidal mode number)=0 mode amplitude in the postcrash phase. It is also shown that Delta(I-SXR)/I-SXR is smaller when the quasi-single helicity state precedes the crash rather than when the multiple-helicity state precedes the crash, and Delta(I-SXR)/I-SXR is smaller when E-parallel to (the parallel electric field at the plasma surface) is approximately zero in the precrash phase rather than E-parallel to being negative. (c) 2005 American Institute of Physics.
机译：在环形夹管实验TPE-1RM20反向场夹管装置中，使用来自高θ（夹点参数）放电的数据研究了影响软X射线（SXR）信号（I-SXR）中锯齿形碰撞幅度的因素[Y 。 Yagi，J.Plasma Fusion Research 69，700（1993）。在TPE-1RM20中，自发出现了无大锯齿的高Theta放电（改进的高Theta模式放电）[Y。平野[Fusion 36，721（1996）]在典型的常规放电中表现出大的锯齿形碰撞。无锯齿状放电自发出现的原因尚不清楚。可以看出，SXR碰撞的归一化幅度[Delta（I-SXR）/ I-SXR]与碰撞后阶段中的m（极化波模数）= 0模态振幅具有很好的相关性。还表明，当准单螺旋状态在崩溃之前而不是在多螺旋状态在崩溃之前时，Delta（I-SXR）/ I-SXR较小，而Delta（I-SXR）/ I-SXR当在碰撞前阶段，E平行于（等离子体表面处的平行电场）近似为零，而不是E平行为负时，则较小。 （c）2005年美国物理研究所。

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