The X-Point Scrape-Off Plasma in JET with L- and H-Modes
The X-Point Scrape-Off Plasma in JET with L- and H-Modes
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DOI：
10.1016/0022-3115(89)90276-6
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发表时间：
1989-04
影响因子：
3.1
通讯作者：
P. Harbour;R. Behrisch;Wenmin Wang
中科院分区：
文献类型：
--
作者：
P. Harbour;R. Behrisch;Wenmin Wang
本文描述了L模和H模在X点放电过程中的射流刮除等离子体。刮除层中有电流流动，影响刮除层中的平衡、输运、加热和杂质的产生。在偏滤器区域获得了D⊥的局域测量。在欧姆放电中，偏滤器隔离线上平行于磁场流动的离子饱和通量为∼10A/cm2。在带有NbI的L模中，它随注入功率水平(P NbI<；8 mW)增加⩽2倍，随着H模的减少而减小。欧姆模和L模的e折叠衰减长度λi SAT相同，但随H模的减小而减小。偏滤器靶的电子温度分别为~30 eV(OH)和~50-60 eV(H模)。L模期间的Te测量没有报道，因为起伏很大。讨论了偏滤器靶处离子刺激脱附对碳侵蚀的增强作用。给出了刮脱层内的流动反转现象。
The JET scrape-off plasma during X-point discharges with L-and H-modes is described. There is a flow of current in the scrape-off layer which can influence equilibrium, transport, heating and impurity generation in the scrape-off layer. A local measurement of D⊥ is obtained in the divertor region. The saturated flux of ions flowing parallel to the magnetic field, I SAT is∼ 10 A/cm 2 at the divertor separatrix in ohmic discharges. In L-mode with NBI it increases by a factor⩽ 2, depending on injected power level (P NBI< 8 MW) and decreases with H-mode. The e-folding decay length, λ I SAT, is the same in ohmic and L-mode but decreases with H-mode. The electron temperatures at the divertor target are~ 30 eV (OH) and~ 50–60 eV (H-mode). Measurements of T e during L-mode are not reported because of the high level of fluctuations. An enhancement in the erosion of carbon due to ion-stimulated desorption at the divertor target is discussed. Flow reversal in the scrape-off layer is demonstrated.