Frequency jump phenomena of e-fishbone mode during high-power ECRH on HL-2A
Frequency jump phenomena of e-fishbone mode during high-power ECRH on HL-2A
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DOI：
10.1088/0029-5515/53/5/053002
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发表时间：
2013-05
期刊：
影响因子：
3.3
通讯作者：
L.M. Yu;X. Ding;W. Chen;S. Chen;Y.B. Dong;X. Ji;Y.P. Zhang;Z. Shi;Yi Liu;J.X. Li
中科院分区：
文献类型：
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作者：
L.M. Yu;X. Ding;W. Chen;S. Chen;Y.B. Dong;X. Ji;Y.P. Zhang;Z. Shi;Yi Liu;J.X. Li
在HL-2A上发现了电子回旋共振加热（ECRH）过程中高能电子激发的鱼骨不稳定性。在高功率ECRH下，软x射线阵列观察到周期性的频率跳变现象。软x射线断层扫描显示，极向模态数为1/1，环向模态数为2/2，且出现跳频。对于跳频现象有一个ECRH功率阈值，一般为0.9 MW左右。两种模式的频率随ECRH功率的增大而增大。实验表明，在低密度高功率ECRH等离子体中，捕获粒子占主导地位。计算了不同放电参数下高能捕获电子的进动频率。结果表明，共振电子的能量与硬x射线测量结果一致。
Fishbone instability excited by energetic electrons during electron cyclotron resonant heating (ECRH) is identified on HL-2A. With high-power ECRH, periodic frequency jump phenomena are observed by soft x-ray arrays. Soft x-ray tomography shows that the poloidal and toroidal mode numbers are 1/1 and 2/2 with the frequency jump. There is an ECRH power threshold for the frequency jump phenomena, which is generally about 0.9 MW. The frequencies of the two modes increase with the ECRH power. Experiments show that trapped particles are dominant in the low-density high-power ECRH plasma. The precessional frequency of the energetic trapped electrons is calculated with different discharge parameters. The results indicate that the energy of resonant electrons is in agreement with the hard x-ray measurement.