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Improved confinement in the TPE-RX RFP by means of the PPCD

机译:通过PPCD改善了TPE-RX RFP的限制

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摘要

Pulsed poloidal current drive (PPCD) (Sarff J S et al 1994 Phys. Rev. Lett. 72 3670) is conducted in a reversed-field pinch (RFP) machine, TPE-RX. The PPCD yields a twofold improvement of poloidal beta and energy confinement time. A quiescent phase is observed in the magnetic fluctuations, deltab, during the PPCD. The result is discussed in terms of the change of the equilibrium configuration along the F-Theta trajectory (F and Theta are the reversal and pinch parameters, respectively). Representative mode amplitude is numerically simulated. The result indicates that a transient nature of the PPCD, where tau(PPCD) (characteristic time of the PPCD operation) much less than tau(D)(0) (resistive diffusion time of the core) holds, allows a trajectory with a deeper F which yields a less turbulent configuration than shot-by-shot F-Theta scans. It is shown that the improvement ratio of tau(E) approximately scales as deltab(-2) for five cases of the PPCD experiments in three RFP machines, including the present work in TPE-RX. [References: 21]
机译:脉冲极向电流驱动(PPCD)(Sarff J S等1994 Phys。Rev. Lett。72 3670)在反向场收缩(RFP)机器TPE-RX中进行。 PPCD产生倍体β和能量限制时间的两倍。在PPCD期间,在电磁波动deltab中观察到了一个静止阶段。根据平衡构型沿F-Theta轨迹的变化来讨论结果(F和Theta分别是反转和收缩参数)。代表模式振幅是数值模拟的。结果表明,PPCD的暂态性质(tau(PPCD)(PPCD操作的特征时间)远小于tau(D)(0)(磁芯的电阻扩散时间)成立)允许更深的轨迹与逐个F-Theta扫描相比,F产生的湍流配置更少。结果表明,在三台RFP机器中,包括在TPE-RX中的当前工作中,五种PPCD实验的tau(E)改善率与deltab(-2)近似成比例。 [参考:21]

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