标题： ADITYA-U托卡马克中通过短气体脉冲注入稳定锯齿不稳定性 显示英文标题

标题： Stabilization of sawteeth instability by short gas pulse injection in ADITYA-U tokamak

摘要： 在ADITYA-U托卡马克装置上的实验表明，通过应用短时间的燃料气体喷射，导致径向密度剖面发生变化，从而显著增强了锯齿振荡周期。 随后，被困电子模（TEMs）的抑制导致核心电子温度的增加。 这减缓了锯齿崩溃后热量的传播，导致在q = 1表面内达到下一次锯齿崩溃所需的临界温度梯度出现延迟。 整个情景与电子回旋共振加热（ECRH）下锯齿振荡的行为有很强的相似性。 我们的研究结果表明了一种替代的、更简单的锯齿控制技术，可能在没有ECRH或其他辅助加热设施的小型/中型托卡马克装置中有用。 显示英文摘要

摘要： Experiments on ADITYA-U tokamak show a marked enhancement in the sawtooth period by application of short gas puffs of fuel that cause a modification of the radial density profile. A consequent suppression of the trapped electron modes (TEMs) then leads to an increase in the core electron temperature. This slows down the heat propagation following a sawtooth crash, causing a delay in achieving the critical temperature gradient inside the q = 1 surface required for the next sawtooth crash to happen. The overall scenario has strong similarities with the behavior of sawtooth under electron cyclotron resonance heating (ECRH). Our findings suggest an alternate, simpler technique for sawtooth control that may be usefully employed in small/medium-sized tokamaks that do not have an ECRH or any other auxiliary heating facility.