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Title: Laser intracavity absorption as a plasma diagnostic aid

Abstract

Trace levels of lithium are detected on 100 ..mu..sec timescales using an electrooptically tuned cw dye laser, in conjunction with a high resolution 0.03 A spectrometer/optical multichannel analyzer. The spectra of Li/sup 7/ resonance lines at 6708 A are analyzed for their Zeeman splitting patterns, after unfolding the effects of intracavity absorption (ICA) on the lineshape. For these timescales, a sensitivity to approx.1 x 10/sup 7/ lithium atoms/cc at a level of ..delta..I/I approx.10% has been observed, corresponding to enhancement factors over single pass absorption of approx.1000X. Intracavity enhancement of the line structure in the wings of the line, and a weak blue shift asymmetry have also been observed, but always in the presence of a central absorption feature. The 0.1 A instantaneous laser linewidth is usually scanned over a 1 A range, at frequencies up to 30 kHz. Ultimately this detection system will enclose a hot, dense fusion plasma ... intersecting an 80 keV, 10 mA neutral lithium beam to probe the plasma internal magnetic field structure, in a non-intrusive fashion.

Authors:
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
OSTI Identifier:
5403096
Report Number(s):
LA-UR-85-2669; CONF-8509127-2
ON: DE85015741
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: 2. international symposium on laser aided plasma diagnostics, Culham, England, 10 Sep 1985; Other Information: Portions of this document are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; PLASMA DIAGNOSTICS; LASER RADIATION; ABSORPTION; DYE LASERS; HOT PLASMA; LITHIUM; ALKALI METALS; ELECTROMAGNETIC RADIATION; ELEMENTS; LASERS; LIQUID LASERS; METALS; PLASMA; RADIATIONS; 700102* - Fusion Energy- Plasma Research- Diagnostics

Citation Formats

Wurden, G A. Laser intracavity absorption as a plasma diagnostic aid. United States: N. p., 1985. Web.
Wurden, G A. Laser intracavity absorption as a plasma diagnostic aid. United States.
Wurden, G A. Tue . "Laser intracavity absorption as a plasma diagnostic aid". United States. https://www.osti.gov/servlets/purl/5403096.
@article{osti_5403096,
title = {Laser intracavity absorption as a plasma diagnostic aid},
author = {Wurden, G A},
abstractNote = {Trace levels of lithium are detected on 100 ..mu..sec timescales using an electrooptically tuned cw dye laser, in conjunction with a high resolution 0.03 A spectrometer/optical multichannel analyzer. The spectra of Li/sup 7/ resonance lines at 6708 A are analyzed for their Zeeman splitting patterns, after unfolding the effects of intracavity absorption (ICA) on the lineshape. For these timescales, a sensitivity to approx.1 x 10/sup 7/ lithium atoms/cc at a level of ..delta..I/I approx.10% has been observed, corresponding to enhancement factors over single pass absorption of approx.1000X. Intracavity enhancement of the line structure in the wings of the line, and a weak blue shift asymmetry have also been observed, but always in the presence of a central absorption feature. The 0.1 A instantaneous laser linewidth is usually scanned over a 1 A range, at frequencies up to 30 kHz. Ultimately this detection system will enclose a hot, dense fusion plasma ... intersecting an 80 keV, 10 mA neutral lithium beam to probe the plasma internal magnetic field structure, in a non-intrusive fashion.},
doi = {},
url = {https://www.osti.gov/biblio/5403096}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1985},
month = {1}
}

Conference:
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