Improvement ofq-profile measurement by fast observation of pellet ablation at ASDEX Upgrade
作者:
H. W. Mu¨ller,
P. T. Lang,
K. Bu¨chl,
M. Kaufmann,
B. V. Kuteev,
P. J. McCarthy,
V. Mertens,
I. Miroshnikov,
W. Schneider,
H. Zohm,
期刊:
Review of Scientific Instruments
(AIP Available online 1997)
卷期:
Volume 68,
issue 11
页码: 4051-4060
ISSN:0034-6748
年代: 1997
DOI:10.1063/1.1148386
出版商: AIP
数据来源: AIP
摘要:
Theq-profile measurement presented in this article is based on the observation of pellets injected into the plasma and viewed with a fast-framing camera. The pellets sublimate in the plasma and the ablated material is ionized. The ions move along the magnetic field lines, while an ablation cloud is forming. This ablation cloud contains a small fraction of neutral particles which emit visible light after collisional excitation. It is therefore possible to visualize the magnetic field lines along which the pellet passes. The inclination angle of the magnetic field lines with respect to the torus midplane can be determined from this observation. The results are compared with the inclination angles delivered by an equilibrium code. Further analysis shows that it is not meaningful to determine theq-profile from the data of only the pellet ablation, in the case of an elongated plasma as in ASDEX Upgrade. However, the accuracy of theq-profile determined by an equilibrium code, especially in the plasma center, can be greatly improved by using the pellet measurements as additional input data. ©1997 American Institute of Physics.
点击下载:
PDF
(2053KB)
返 回