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Title: Measurements of Z{sub EFF} spatial profiles from bremsstrahlung emission in the visible and near infrared spectral region

Abstract

Measurement of plasma radiation (i.e., breusstrahlung) in the infrared (IR) range ({lambda}=933, 978 nm), at six lines of sight from z={minus}20 cm to z=8 cm above the equatorial plane, using the detection system of the Frascati Tokamak Upgrade (FTU) Thomson scattering system (TSS) are reported. The agreement of IR with visible ({lambda}=540 nm) bremsstrahlung intensity {ital S}, [S=photons/(m{sup 2}srnms)] measurements is within 20{percent}{endash}30{percent} and depends upon the absolute calibration of both systems. The intensity is equal S(z)={l_angle}Z{sub eff}Gn{sup 2}/T{sub e}{sup 1/2}{r_angle}, where {l_angle}{center_dot}{r_angle} means average on a line of sight. For determining the Z{sub eff} the Gaunt factor(G) is needed, and analysis the Born{endash}Elwert formula is used. The Z{sub eff} spatial profiles (i.e., Z{sub eff}(r)), are determined using the plasma temperature (T{sub e}) and density (n{sub e}) measured by the TSS and the Abel inverted intensity profiles, determined using the plasma radiation S(z) measured from six horizontal chords. Z{sub eff}(r) behavior in a variety of FTU discharges is presented. {copyright} {ital 1997 American Institute of Physics.}

Authors:
; ; ; ;  [1]
  1. Associazione EURATOM-ENEA sulla Fusione, Centro Ricerche Frascati, C.P.65, 00044 Frascati, Rome (Italy)
Publication Date:
OSTI Identifier:
451943
Report Number(s):
CONF-960543-
Journal ID: RSINAK; ISSN 0034-6748; TRN: 97:006300
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 68; Journal Issue: 1; Conference: 11. annual high-temperature plasma diagnostics conference, Monterey, CA (United States), 12-16 May 1996; Other Information: PBD: Jan 1997
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; TOKAMAK DEVICES; PLASMA DIAGNOSTICS; BREMSSTRAHLUNG; EFFECTIVE CHARGE; EMISSION SPECTROSCOPY; INFRARED SPECTRA; VISIBLE SPECTRA; EMISSION SPECTRA; FT TOKAMAK; INFRARED SPECTROMETERS; OPTICAL SPECTROMETERS; plasma toroidal confinement

Citation Formats

Orsitto, F, Belforte, M R, Borra, M, Brusadin, A, and Giovannozzi, E. Measurements of Z{sub EFF} spatial profiles from bremsstrahlung emission in the visible and near infrared spectral region. United States: N. p., 1997. Web. doi:10.1063/1.1147776.
Orsitto, F, Belforte, M R, Borra, M, Brusadin, A, & Giovannozzi, E. Measurements of Z{sub EFF} spatial profiles from bremsstrahlung emission in the visible and near infrared spectral region. United States. doi:10.1063/1.1147776.
Orsitto, F, Belforte, M R, Borra, M, Brusadin, A, and Giovannozzi, E. Wed . "Measurements of Z{sub EFF} spatial profiles from bremsstrahlung emission in the visible and near infrared spectral region". United States. doi:10.1063/1.1147776.
@article{osti_451943,
title = {Measurements of Z{sub EFF} spatial profiles from bremsstrahlung emission in the visible and near infrared spectral region},
author = {Orsitto, F and Belforte, M R and Borra, M and Brusadin, A and Giovannozzi, E},
abstractNote = {Measurement of plasma radiation (i.e., breusstrahlung) in the infrared (IR) range ({lambda}=933, 978 nm), at six lines of sight from z={minus}20 cm to z=8 cm above the equatorial plane, using the detection system of the Frascati Tokamak Upgrade (FTU) Thomson scattering system (TSS) are reported. The agreement of IR with visible ({lambda}=540 nm) bremsstrahlung intensity {ital S}, [S=photons/(m{sup 2}srnms)] measurements is within 20{percent}{endash}30{percent} and depends upon the absolute calibration of both systems. The intensity is equal S(z)={l_angle}Z{sub eff}Gn{sup 2}/T{sub e}{sup 1/2}{r_angle}, where {l_angle}{center_dot}{r_angle} means average on a line of sight. For determining the Z{sub eff} the Gaunt factor(G) is needed, and analysis the Born{endash}Elwert formula is used. The Z{sub eff} spatial profiles (i.e., Z{sub eff}(r)), are determined using the plasma temperature (T{sub e}) and density (n{sub e}) measured by the TSS and the Abel inverted intensity profiles, determined using the plasma radiation S(z) measured from six horizontal chords. Z{sub eff}(r) behavior in a variety of FTU discharges is presented. {copyright} {ital 1997 American Institute of Physics.}},
doi = {10.1063/1.1147776},
journal = {Review of Scientific Instruments},
number = 1,
volume = 68,
place = {United States},
year = {1997},
month = {1}
}