Development of the gas puff charge exchange recombination spectroscopy (GP-CXRS) technique for ion measurements in the plasma edge

被引：27

作者：

Churchill, R. M. ^{[1
]}

Theiler, C. ^{[1
]}

Lipschultz, B. ^{[1
]}

Dux, R. ^{[2
]}

Puetterich, T. ^{[2
]}

Viezzer, E. ^{[2
]}

机构：

[1] MIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA

[2] Max Planck Inst Plasma Phys, EURATOM Assoc, D-85748 Garching, Germany

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 2013年 / 84卷 / 09期

关键词：

ALCATOR C-MOD; ELECTRON-CAPTURE; TRANSPORT; TOKAMAK; CONFINEMENT; COLLISIONS; PEDESTAL; DEVICES;

D O I：

10.1063/1.4821084

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

A novel charge-exchange recombination spectroscopy (CXRS) diagnostic method is presented, which uses a simple thermal gas puff for its donor neutral source, instead of the typical high-energy neutral beam. This diagnostic, named gas puff CXRS (GP-CXRS), is used to measure ion density, velocity, and temperature in the tokamak edge/pedestal region with excellent signal-background ratios, and has a number of advantages to conventional beam-based CXRS systems. Here we develop the physics basis for GP-CXRS, including the neutral transport, the charge-exchange process at low energies, and effects of energy-dependent rate coefficients on the measurements. The GP-CXRS hardware setup is described on two separate tokamaks, Alcator C-Mod and ASDEX Upgrade. Measured spectra and profiles are also presented. Profile comparisons of GP-CXRS and a beam based CXRS system show good agreement. Emphasis is given throughout to describing guiding principles for users interested in applying the GP-CXRS diagnostic technique. (C) 2013 AIP Publishing LLC.

引用

页数：15

共 45 条

[1] Exploiting a transmission grating spectrometer [J].