Finite Larmor radii effects in fast ion measurements with neutron emission spectrometry

被引：13

作者：

Eriksson, J. ^{[1
]}

Hellesen, C. ^{[1
]}

Sunden, E. Andersson ^{[1
]}

Cecconello, M. ^{[1
]}

Conroy, S. ^{[1
]}

Ericsson, G. ^{[1
]}

Johnson, M. Gatu ^{[1
]}

Pinches, S. D. ^{[2
]}

Sharapov, S. E. ^{[2
]}

Weiszflog, M. ^{[1
]}

机构：

[1] Uppsala Univ, Dept Phys & Astron, EURATOM VR, Uppsala, Sweden

[2] EURATOM CCFE Fus Assoc, Culham Sci Ctr, Abingdon, Oxon, England

来源：

PLASMA PHYSICS AND CONTROLLED FUSION | 2013年 / 55卷 / 01期

关键词：

JET;

D O I：

10.1088/0741-3335/55/1/015008

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：

When analysing data from fast ion measurements it is normally assumed that the gyro-phase distribution of the ions is isotropic within the field of view of the measuring instrument. This assumption is not valid if the Larmor radii of the fast ions are comparable to-or larger than-the gradient scale length in the spatial distribution of the ions, and if this scale length is comparable to-or smaller than-the width of the field of view of the measuring instrument. In this paper the effect of such an anisotropy is demonstrated by analysing neutron emission spectrometry data from a JET experiment with deuterium neutral beams together with radiofrequency heating at the third harmonic of the deuterium cyclotron frequency. In the experiment, the neutron time-of-flight spectrometer TOFOR was used to measure the neutrons from the d(d,n)He-3-reaction. Comparison of the experimental data with Monte Carlo calculations shows that the finite Larmor radii of the fast ions need to be included in the modelling to get a good description of the data. Similar effects are likely to be important for other fast ion diagnostics, such as gamma-ray spectroscopy and neutral particle analysis, as well.

引用

页数：9

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