POLOIDAL ROTATION VELOCITIES IN THE OUTER HALF OF ALCATOR-C PLASMAS

被引:7
作者
BENJAMIN, RD [1 ]
TERRY, JL [1 ]
MOOS, HW [1 ]
机构
[1] JOHNS HOPKINS UNIV, DEPT PHYS & ASTRON, BALTIMORE, MD 21218 USA
来源
PHYSICAL REVIEW A | 1990年 / 41卷 / 02期
关键词
D O I
10.1103/PhysRevA.41.1034
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Poloidal rotation velocities in the outer half of ohmically heated Alcator-C plasmas have been determined from the Doppler shift of impurity emission lines. The measurements were made using a high-resolution photon-counting detector, sensitive to wavelengths from 1200 to 2000 AI, mounted in the exit plane of a 1-m Ebert-Fastie spectrometer. The following transitions were used: 2s2p1P°12p2 1D2 at 1371.292 at 1371.292 AI in O v, 2s 2S1/22p2P°1/2 at 1242.804 AI in N v (both of which exist near the limiter radius in Alcator-C), and 1s2s S131s2p°23 at 1623.63 AI in O vii (which exists at r/a0.8). The measured rotation velocities are 45×105 cm/s in the direction of the electron diamagnetic drift at the radius of the O v emission shell and 6×105 cm/s at the radius of the O vii emission shell, again in the electron diamagnetic drift direction. Therefore poloidal rotation of the outer half of the Alcator-C plasma with a velocity of several times 105 cm/s in the direction of the electron diamagnetic drift is firmly established by these measurements. © 1990 The American Physical Society.
引用
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页码:1034 / 1040
页数:7
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