Upgrade of far-infrared laser-based Faraday rotation measurement on MST

被引：41

作者：

Ding, W. X. ^{[1
]}

Brower, D. L. ^{[1
]}

Bergerson, W. F. ^{[1
]}

Lin, L. ^{[1
]}

机构：

[1] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 2010年 / 81卷 / 10期

关键词：

REVERSED-FIELD PINCH; INTERFEROMETER; EQUILIBRIUM; DENSITY; PLASMAS; SYSTEM;

D O I：

10.1063/1.3466898

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

Recently, the far-infrared (FIR) laser (lambda(0) 0 = 432 mu m) Faraday rotation measurement system on MST has been upgraded. The dc flowing-gas discharge CO2 pump laser is replaced by a rf-excited, sealed CO2 laser at 9.27 mu m (GEM select 100, Coherent Inc., Santa Clara, CA), which is subdivided equally into three parts to simultaneously pump three FIR cavities. The total infrared pump power is approximately 80 W on the 9R (20) line required to pump the formic acid molecule. Each FIR cavity produces similar to 12 mW, sufficient for 11 simultaneous chord interferometry-polarimetry operations. Three key issues [(1) conservation of circularly polarized wave, (2) colinearity of two probe waves, and (3) stability of intermediate frequencies between lasers] affecting the Faraday rotation measurement have been resolved experimentally. (C) 2010 American Institute of Physics. [doi:10.1063/1.3466898]

引用

页数：5

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