Plasma rotation profile measurements using Doppler reflectometry

被引:220
作者
Conway, GD [1 ]
Schirmer, J
Klenge, S
Suttrop, W
Hozhauer, E
机构
[1] Max Planck Inst Plasma Phys, EURATOM Assoc, IPP, D-85748 Garching, Germany
[2] Univ Stuttgart, Inst Plasmaforsch, D-70569 Stuttgart, Germany
关键词
D O I
10.1088/0741-3335/46/6/003
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
High spatial resolution radial profiles of the perpendicular plasma rotation velocity u(perpendicular to) using a dual channel 50-75 GHz Doppler reflectometer system on the ASDEX Upgrade tokamak are presented for a variety of discharge scenarios, including Ohmic, L-mode, H-mode, etc with forward and reversed magnetic field and co- and counter neutral beam injection. The reflectometers have steppable launch frequencies f(o) = c/lambda(o), with selectable O- or X-mode polarization, giving tokamak edge to mid-radius coverage. Low-field-side antennae (hog-horn antenna pairs) with deliberate tilting (primarily poloidally) produce a Doppler shifted spectrum directly proportional to the perpendicular velocity f(D) = u(perpendicular to)k(perpendicular to)/2pi = u(perpendicular to)2 sin theta(t)/lambda(o). The incident angle delta(t) between the beam and cut-off layer normal varies with plasma shape, cut-off layer position and refraction. However, typical angles range from 5degrees to 27degrees giving a probed turbulence wavenumber, k(perpendicular to), range of 1.8-14.3 cm(-1), with resulting Doppler shifts f(D) of up to 5 MHz. The measured perpendicular velocity is u(perpendicular to) = v(ExB) + v(phase), which for a typical H-mode is slightly positive in the tokamak scrape-off-layer with a deep negative well across the H-mode steep pressure gradient pedestal region and then following the perpendicularly projected toroidal fluid velocity in the core, should be dominated by the E x B velocity, as the intrinsic phase velocity is predicted to be small, which may allow u(perpendicular to) to be interpreted directly as the radial electric field E-r profile.
引用
收藏
页码:951 / 970
页数:20
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