Energetic ion driven resistive InterChange modes (EICs) accompanying repeated bursts of the magnetic fluctuations were found in hydrogen campaign of large helical device. The pressure gradient of helically trapped energetic particles, which are mainly produced by perpendicularly injected beams, drives this mode. Recently, perpendicular neutral beam injection (PERP-NBI) systems are upgraded for deuterium plasma campaign. The beam energies of the two PERP-NBIs are increased from 40/40 keV to 60/80 keV, respectively. And the injection powers increase from 6/6 MW to 9/9 MW, as well. As results of these upgrades of NBIs, the β value of helically trapped energetic ions, , has increased up to ∼0.35% and induced EICs with larger bursts and smaller repetition frequencies. It is found that the threshold of to excite EICs increases with deuterium PERP-NBIs. The amplitude of each burst and effect on energetic beam ions become larger when is larger. In addition, a large electrostatic potential about −25 kV is observed when EICs are excited, which is about two times larger than the potential observed in hydrogen campaign. The transient increases of the electron density and temperature in edge regions are clearly observed when the electrostatic potential is formed.
大型螺旋装置氢等离子体实验中发现了伴随磁涨落重复爆发的高能离子驱动电阻性交换模（EICs）。该模式由主要来源于垂直注入束的高能俘获粒子压力梯度所驱动。近期，为氘等离子体实验升级了垂直中性束注入（PERP-NBI）系统。两束PERP-NBI的束能量分别从40/40 keV提高至60/80 keV，注入功率也从6/6 MW增加至9/9 MW。由于这些NBI的升级，高能俘获离子的β值增加至约0.35%，并诱导出具有更大爆发幅度和更低重复频率的EICs。研究发现，在氘PERP-NBI条件下，激发EICs的阈值随β值增大而提高。当β值增大时，每次爆发的幅度及其对高能束离子的影响也相应增强。此外，当EICs被激发时，观测到约−25 kV的显著静电势，该值约为氢等离子体实验中观测值的两倍。当静电势形成时，边缘区域的电子密度和温度出现明显的瞬态增加。