The NSTX fast-ion D-alpha diagnostic

被引：53

作者：

Podesta, M. ^{[1
]}

Heidbrink, W. W. ^{[1
]}

Bell, R. E. ^{[2
]}

Feder, R. ^{[2
]}

机构：

[1] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA

[2] Princeton Plasma Phys Lab, Princeton, NJ 08543 USA

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 2008年 / 79卷 / 10期

关键词：

particle beams; plasma diagnostics; plasma toroidal confinement; plasma-beam interactions; Tokamak devices;

D O I：

10.1063/1.2956744

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

A new diagnostic, aimed at energy-resolved measurements of the spatial and temporal dynamics of fast ions in NSTX plasmas, is described. It is based on active charge-exchange recombination spectroscopy. The fast-ion signal is inferred from light emitted in the wavelength range of the D(alpha) line by fast ions recombining with an injected neutral beam. Two complementary systems are operational. The first system, based on a spectrometer coupled to a charge coupled device detector, has 16 channels with space, time, and energy resolution of 5 cm, 10 ms, and 10 keV, respectively. The second system monitors the energy-integrated fast-ion signal on time scales of similar to 20 mu s at three different radii. Signals are measured by a multianode photomultiplier tube. For both systems, each channel includes two paired views, intercepting and missing the neutral beam for a direct subtraction of the background signal not associated with fast ions. Examples of signals from the 2008 NSTX run are presented.

引用

页数：5

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