Design of a cavity ring-down spectroscopy diagnostic for negative ion rf source SPIDER

被引：17
作者：
Pasqualotto, R. [1 ]
Alfier, A. [1 ]
Lotto, L. [1 ]
机构：
[1] Consorzio RFX Assoc Euratom Enea Fus, I-35127 Padua, Italy
来源：
REVIEW OF SCIENTIFIC INSTRUMENTS | 2010年 / 81卷 / 10期
关键词：
DENSITIES;
D O I：
10.1063/1.3475372
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
The rf source test facility SPIDER will test and optimize the source of the 1 MV neutral beam injection systems for ITER. Cavity ring-down spectroscopy (CRDS) will measure the absolute line-of-sight integrated density of negative (H- and D-) ions, produced in the extraction region of the source. CRDS takes advantage of the photodetachment process: negative ions are converted to neutral hydrogen atoms by electron stripping through absorption of a photon from a laser. The design of this diagnostic is presented with the corresponding simulation of the expected performance. A prototype operated without plasma has provided CRDS reference signals, design validation, and results concerning the signal-to-noise ratio. (C) 2010 American Institute of Physics. [doi:10.1063/1.3475372]
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页数：5
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