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Title: Horizontal Thomson Scattering Systems for DIII-D and SSPX

Abstract

DIII-D--Three of the seven existing core Thomson scattering laser beams were redirected to probe the previously unmeasured central region of the DIII-D plasma. Modifications to the existing collection optics system and support tower were made to inject the lasers and collect scattered light in this new extended region. Stray light levels were reduced to acceptable levels to permit Rayleigh scattering calibration on five of the six new channels, indicating that the new in-vessel dump operates well. Measurements of the plasma temperature and density from the plasma edge to the center are now possible. Peaked density profiles are now observed in this new measurement region. SSPX--We have completed the design and installation of a 10-spatial channel Thomson scattering system to measure the plasma temperature and density profile on SSPX. A single-pulsed YAG laser operating at 0.7 J and 8 ns is used to scatter photons into a 7-element collection optic that provides a spatial resolution of 1.5 cm at the outer plasma edge and 7.5 cm at the inner edge of a .5 m radius spheromak plasma. The collected light is then analyzed by a 4-channel interference filtered polychromator which has been optimized to measure temperatures between 2 eV and 2more » keV and densities as low as 1 x 10{sup 12} cm{sup 3}. We use an in-vessel beam dump and a series of entrance and exit baffles to reduce the stray laser light and provide for an absolute density calibration by Rayleigh scattering in argon gas.« less

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
General Atomics, San Diego, CA (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
766821
Report Number(s):
GA-A23198
TRN: US0109395
DOE Contract Number:  
W-7405-ENG-48; AC02-76CH03073; AC03-99ER54463
Resource Type:
Conference
Resource Relation:
Conference: 9th International Symposium on Laser-Aided Plasma Diagnostics, Lake Tahoe, CA (US), 09/26/1999--10/01/1999; Other Information: PBD: 1 Aug 1999
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BEAM DUMPS; DOUBLET-3 DEVICE; PLASMA DIAGNOSTICS; RAYLEIGH SCATTERING; SPATIAL RESOLUTION; THOMSON SCATTERING; SSPX DEVICE; PLASMA DENSITY

Citation Formats

Nilson, D G, Hill, D N, Wood, R D, McClean, H, Moeller, J M, Labik, G, Carlstron, T N, Bray, B, and Hsieh, C L. Horizontal Thomson Scattering Systems for DIII-D and SSPX. United States: N. p., 1999. Web.
Nilson, D G, Hill, D N, Wood, R D, McClean, H, Moeller, J M, Labik, G, Carlstron, T N, Bray, B, & Hsieh, C L. Horizontal Thomson Scattering Systems for DIII-D and SSPX. United States.
Nilson, D G, Hill, D N, Wood, R D, McClean, H, Moeller, J M, Labik, G, Carlstron, T N, Bray, B, and Hsieh, C L. Sun . "Horizontal Thomson Scattering Systems for DIII-D and SSPX". United States. https://www.osti.gov/servlets/purl/766821.
@article{osti_766821,
title = {Horizontal Thomson Scattering Systems for DIII-D and SSPX},
author = {Nilson, D G and Hill, D N and Wood, R D and McClean, H and Moeller, J M and Labik, G and Carlstron, T N and Bray, B and Hsieh, C L},
abstractNote = {DIII-D--Three of the seven existing core Thomson scattering laser beams were redirected to probe the previously unmeasured central region of the DIII-D plasma. Modifications to the existing collection optics system and support tower were made to inject the lasers and collect scattered light in this new extended region. Stray light levels were reduced to acceptable levels to permit Rayleigh scattering calibration on five of the six new channels, indicating that the new in-vessel dump operates well. Measurements of the plasma temperature and density from the plasma edge to the center are now possible. Peaked density profiles are now observed in this new measurement region. SSPX--We have completed the design and installation of a 10-spatial channel Thomson scattering system to measure the plasma temperature and density profile on SSPX. A single-pulsed YAG laser operating at 0.7 J and 8 ns is used to scatter photons into a 7-element collection optic that provides a spatial resolution of 1.5 cm at the outer plasma edge and 7.5 cm at the inner edge of a .5 m radius spheromak plasma. The collected light is then analyzed by a 4-channel interference filtered polychromator which has been optimized to measure temperatures between 2 eV and 2 keV and densities as low as 1 x 10{sup 12} cm{sup 3}. We use an in-vessel beam dump and a series of entrance and exit baffles to reduce the stray laser light and provide for an absolute density calibration by Rayleigh scattering in argon gas.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {8}
}

Conference:
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