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Title: Acceleration of beam ions during major radius compression in TFTR

Abstract

Tangentially co-injected deuterium beam ions were accelerated from 82 keV up to 150 keV during a major radius compression experiment in TFTR. The ion energy spectra and the variation in fusion yield were in good agreement with Fokker-Planck code simulations. In addition, the plasma rotation velocity was observed to rise during compression.

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Princeton Univ., NJ (USA). Plasma Physics Lab.
OSTI Identifier:
5142239
Report Number(s):
PPPL-2247
ON: DE86000583
DOE Contract Number:
AC02-76CH03073
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; TFTR TOKAMAK; BEAM INJECTION HEATING; MAGNETIC COMPRESSION; ACCELERATION; COMPRESSION; DEUTERIUM IONS; ENERGY SPECTRA; ION BEAMS; PLASMA; ROTATION; BEAMS; CHARGED PARTICLES; HEATING; IONS; MOTION; PLASMA HEATING; SPECTRA; THERMONUCLEAR REACTORS; TOKAMAK TYPE REACTORS; 700101* - Fusion Energy- Plasma Research- Confinement, Heating, & Production

Citation Formats

Wong, K.L., Bitter, M., Hammett, G.W., Heidbrink, W., Hendel, H., Kaita, R., Scott, S., Strachan, J.D., Tait, G., and Bell, M.G. Acceleration of beam ions during major radius compression in TFTR. United States: N. p., 1985. Web. doi:10.2172/5142239.
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Wong, K.L., Bitter, M., Hammett, G.W., Heidbrink, W., Hendel, H., Kaita, R., Scott, S., Strachan, J.D., Tait, G., & Bell, M.G. Acceleration of beam ions during major radius compression in TFTR. United States. doi:10.2172/5142239.
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Wong, K.L., Bitter, M., Hammett, G.W., Heidbrink, W., Hendel, H., Kaita, R., Scott, S., Strachan, J.D., Tait, G., and Bell, M.G. Sun . "Acceleration of beam ions during major radius compression in TFTR". United States. doi:10.2172/5142239. https://www.osti.gov/servlets/purl/5142239.
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@article{osti_5142239,
title = {Acceleration of beam ions during major radius compression in TFTR},
author = {Wong, K.L. and Bitter, M. and Hammett, G.W. and Heidbrink, W. and Hendel, H. and Kaita, R. and Scott, S. and Strachan, J.D. and Tait, G. and Bell, M.G.},
abstractNote = {Tangentially co-injected deuterium beam ions were accelerated from 82 keV up to 150 keV during a major radius compression experiment in TFTR. The ion energy spectra and the variation in fusion yield were in good agreement with Fokker-Planck code simulations. In addition, the plasma rotation velocity was observed to rise during compression.},
doi = {10.2172/5142239},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Sep 01 00:00:00 EDT 1985},
month = {Sun Sep 01 00:00:00 EDT 1985}
}
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Technical Report:
View Technical Report (0.31 MB)
DOI:  10.2172/5142239
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  • ; ; ; ...
    The time history of the central toroidal plasma rotation velocity in Tokamak Fusion Test Reactor (TFTR) experiments with auxiliary heating by neutral deuterium beam injection and major-radius compression has been measured from the Doppler shift of the emitted TiXXI-K..cap alpha.. line radiation. The experiments were conducted for neutral beam powers in the range from 2.1 to 3.8 MW and line-averaged densities in the range from 1.8 to 3.0 x 10/sup 19/ m/sup -2/. The observed rotation velocity increase during compression is in agreement with results from modeling calculations which assume classical slowing-down of the injected fast deuterium ions and momentummore » damping at the rate established in the precompression plasma.« less

  • ; ; ; ... - Phys. Rev. Lett.; (United States)
    Tangentially coinjected deuterium beam ions were accelerated from 82 up to 150 keV during a major-radius compression experiment in the tokamak fusion test reactor. The ion energy spectra and the variation in fusion yield were in good agreement with Fokker-Planck code simulations. In addition, the plasma rotation velocity was observed to rise during compression.

  • ; ; ; ... - Physics of Fluids B; (USA)
    The time history of the central toroidal plasma rotation velocity in Tokamak Fusion Test Reactor (TFTR) experiments (Phys. Rev. Lett. {bold 55}, 2587 (1985)) with auxiliary heating by neutral deuterium beam injection and major-radius compression has been measured from the Doppler shift of the emitted Ti XXI K{alpha} line radiation. The experiments were conducted for neutral beam powers in the range 2.1--3.8 MW and line-averaged densities in the range 1.8--3.0{times}10{sup 19} m{sup {minus}2}. The observed rotation velocity increase during compression is consistent with theoretical estimates.

  • ; ; ; ...
    A kinetic approach is developed to understand the individual charged particle behavior as well as plasma macro parameters (temperature, density, etc.) during the adiabatic R-compression in a tokamak. The perpendicular electric field from Ohm's law at zero resistivity E = -v{sub E}{times}B/c is made use of to obtain the equation for particle velocity evolution in order to describe the particle motion during the R-compression. Expressions for both passing and trapped particle energy and pitch angle change are obtained for a plasma with high aspect ratio and circular magnetic surfaces. The particle behavior near the trapped passing boundary during the compressionmore » is also studied to understand the shift induced loss of alpha particles produced by D-T fusion reactions in Tokamak Fusion Test Reactor experiments. Qualitative agreement is obtained with the experiments. Solving the drift kinetic equation in the collisional case, i.e., when the collisional frequency of given species exceeds the inverse compression time, we obtain that the temperature and the density evolution is reduced to the MHD results T {approximately} R{super -4/3} and n {approximately} R{super -2}, respectively. In the opposite case, the collisional frequency of given species is smaller than the inverse compression time, the longitudinal component of the temperature evolve like R{super -2} and perpendicular component of the temperature is R{super -1}. The effect of toroidicity is negligible in both cases.« less

  • ; ; ; ...
    A kinetic approach is developed to understand the individual charged particle behavior as well as plasma macro parameters (temperature, density, etc.) during the adiabatic R-compression in a tokamak. The perpendicular electric field from Ohm`s law at zero resistivity E = {minus}v{sub E} x B/c is made use of to obtain the equation for particle velocity evolution in order to describe the particle motion during the R-compression. Expressions for both passing and trapped particle energy and pitch angle change are obtained for a plasma with high aspect ratio and circular magnetic surfaces. The particle behavior near the trapped passing boundary duringmore » the compression is also studied to understand the shift induced loss of alpha particles produced by D-T fusion reactions in Tokamak Fusion Test Reactor experiments. Qualitative agreement is obtained with the experiments. Solving the drift kinetic equation in the collisional case, i.e., when the collisional frequency {nu}{sub coll} of given species exceeds the inverse compression time {tau}{sub compr}{sup {minus}1}, the authors obtain that the temperature and the density evolution is reduced to the MHD results T {approximately} R{sup {minus}4/3} and n {approximately} R{sup {minus}2}, respectively. In the opposite case, {nu}{sub coll} {much_lt} {tau}{sub compr}{sup {minus}1}, the longitudinal component of the temperature evolve like R(superscript)-2(end superscript) and perpendicular components of the temperature evolve like T{sub {parallel}} {approximately} R{sup {minus}2} and T{sub {perpendicular}} {approximately} R{sup {minus}1}. The effect of toroidicity is negligible in both cases.« less