低杂波电流驱动下HT-7超导托卡马克逃逸电子行为
Runaway electrons on HT-7 Tokamak with low hybrid current drive
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摘要: HT-7托卡马克的逃逸电子诊断系统由CdTe,BGO,Na三种探测器组成，可以用来观测逃逸电子撞击托卡马克第一壁材料产生的硬X射线轫致辐射，它的能量响应范围是0.3~1.5 MeV。结合电子回旋辐射、中子等诊断手段，研究了HT-7超导托卡马克在低杂波电流驱动下的逃逸电子行为。实验结果显示：高功率低杂波的关断和低功率低杂波的投入都会增强逃逸电子的产生，但是如果低杂波可以将等离子体环电压降低到逃逸的阈值电场以下，低杂波的投入就可以抑制电子的逃逸。逃逸电子的产生还和低杂波功率有着密切的关系，可以通过控制低杂波的投入和关断的时刻以及改变低杂波功率来抑制逃逸电子的产生。Abstract: Runaway electron detection system composed of CdTe, BGO and NaI was used to measure the hard X-ray (HXR) emission in the energy range 0.3～15 MeV when the runaways hit the first wall. With electron cyclotron emission and neutron detect systems,the runaway electrons on HT-7 Tokamak with low hybrid current drive (LHCD) were investigated. It was found that in LHCD discharges with high loop voltage as well as the termination of high low hybrid power can accelerate the fast electrons into runaways. The results also indicate that the reduction of the electric field accomplished by LHCD produces a suppression of the existing runaway population.
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Key words:
- tokamak low hybrid current drive /
- runaway electron /
- hard x-ray /
- bremsstrahlung
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