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CO2 (
m = 10.6 µm) He–Ne (c = 633 nm) two-color laser interferometry for low and medium electron density measurements in the TJ-II Stellarator
Rev. Sci. Instrum. 75, 4671 (2004); doi:10.1063/1.1809283
Published 1 November 2004
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In this article we describe the setup, installation, calibration, and operation of the two-color (CO2–HeNe) laser heterodyne interferometer installed in the TJ-II Stellarator. This diagnostic has been routinely working during the last TJ-II experimental campaign (Autumn 2003) in low-density [electron cyclotron resonance (ECRH) heated, ne
1019 m–3] and medium density [neutral beam injection (NBI) heated, ne5×1019 m–3] plasmas with line integral error better than 2×1017 m–2. This work demonstrates the possibility of using low-cost two wavelength laser interferometric diagnostics to measure low and medium-density plasmas instead of the complicated far infrared (FIR) interferometric systems that also suffer from fringe-jumps errors. The issues of low sensitivity to plasma density and mechanical vibration subtraction typical of these laser interferometers are solved through proper calibration of the interferometric system in the machine. First results on NBI heated plasmas measured by the laser interferometric system in the Stellarator TJ-II will be shown.
©2004 American Institute of Physics
1019 m–3] and medium density [neutral beam injection (NBI) heated, ne5×1019 m–3] plasmas with line integral error better than 2×1017 m–2. This work demonstrates the possibility of using low-cost two wavelength laser interferometric diagnostics to measure low and medium-density plasmas instead of the complicated far infrared (FIR) interferometric systems that also suffer from fringe-jumps errors. The issues of low sensitivity to plasma density and mechanical vibration subtraction typical of these laser interferometers are solved through proper calibration of the interferometric system in the machine. First results on NBI heated plasmas measured by the laser interferometric system in the Stellarator TJ-II will be shown.
©2004 American Institute of Physics
| History: | Received 6 April 2004; accepted 20 August 2004; published 1 November 2004 |
| Permalink: |
http://link.aip.org/link/?RSINAK/75/4671/1 |
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del.icio.us
BibSonomy
KEYWORDS and PACS
plasma diagnostics,
light interferometry,
light interferometers,
stellarators,
fusion reactor instrumentation,
plasma density,
plasma radiofrequency heating,
plasma beam injection heating,
measurement by laser beam,
gas lasers,
calibration,
vibrations,
plasma confinement
- 52.70.Kz
Optical (ultraviolet, visible, infrared) plasma diagnostic measurements - 07.60.Ly
Optical interferometers - 28.52.Lf
Fusion reactor components and instrumentation - 52.55.Hc
Stellarators, torsatrons, heliacs, bumpy tori, and other toroidal confinement devices - 52.25.-b
Plasma properties - YEAR: 2004
RELATED DATABASES
PUBLICATION DATA
0034-6748 (print)
1089-7623 (online)
AIP
REFERENCES (13)
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