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Title: Electron power deposition measurements during ion cyclotron range of frequency heating on C-Mod

Abstract

A 19-channel electron cyclotron emission (ECE) grating polychromator has been added to the existing ECE diagnostics on C-Mod, which include a 9-channel polychromator, heterodyne radiometer and Michelson interferometer. The new instrument can significantly improve the radial resolution of electron power deposition measurements in ICRF experiments on C-Mod. The improved resolution is important for resolving electron power deposition in off-axis mode conversion heating regimes where the mode conversion region can be narrow. The first data from this new instrument were acquired last year during 80 MHz hydrogen minority D-H mode conversion experiments where the H/(H+D) ratio was varied from 0.02 to 0.30 and the toroidal field was varied from 5.1 to 5.7 T. Although complicated by the presence of large sawteeth, some electron power deposition results were obtained from a break-in-slope method. These results, together with results from data acquired during the current C-Mod experimental campaign, will be presented and compared to predicted radial deposition profiles from the TORIC, 2-D full wave RF code, and the METS95, 1-D integral wave RF code. (c) 1999 American Institute of Physics.

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [2];  [2];  [2]
  1. Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543 (United States)
  2. Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
Publication Date:
OSTI Identifier:
20216723
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 485; Journal Issue: 1; Other Information: PBD: 20 Sep 1999; Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ICR HEATING; TOKAMAK TYPE REACTORS; PLASMA DIAGNOSTICS; ELECTRON TEMPERATURE; POWER RANGE 01-10 MW; ABSORPTION

Citation Formats

Taylor, G., LeBlanc, B., Phillips, C. K., Schilling, G., Wilson, J. R., Hubbard, A., Bonoli, P., Nelson-Melby, E., and Wukitch, S. J. Electron power deposition measurements during ion cyclotron range of frequency heating on C-Mod. United States: N. p., 1999. Web. doi:10.1063/1.59714.
Taylor, G., LeBlanc, B., Phillips, C. K., Schilling, G., Wilson, J. R., Hubbard, A., Bonoli, P., Nelson-Melby, E., & Wukitch, S. J. Electron power deposition measurements during ion cyclotron range of frequency heating on C-Mod. United States. doi:10.1063/1.59714.
Taylor, G., LeBlanc, B., Phillips, C. K., Schilling, G., Wilson, J. R., Hubbard, A., Bonoli, P., Nelson-Melby, E., and Wukitch, S. J. Mon . "Electron power deposition measurements during ion cyclotron range of frequency heating on C-Mod". United States. doi:10.1063/1.59714.
@article{osti_20216723,
title = {Electron power deposition measurements during ion cyclotron range of frequency heating on C-Mod},
author = {Taylor, G. and LeBlanc, B. and Phillips, C. K. and Schilling, G. and Wilson, J. R. and Hubbard, A. and Bonoli, P. and Nelson-Melby, E. and Wukitch, S. J.},
abstractNote = {A 19-channel electron cyclotron emission (ECE) grating polychromator has been added to the existing ECE diagnostics on C-Mod, which include a 9-channel polychromator, heterodyne radiometer and Michelson interferometer. The new instrument can significantly improve the radial resolution of electron power deposition measurements in ICRF experiments on C-Mod. The improved resolution is important for resolving electron power deposition in off-axis mode conversion heating regimes where the mode conversion region can be narrow. The first data from this new instrument were acquired last year during 80 MHz hydrogen minority D-H mode conversion experiments where the H/(H+D) ratio was varied from 0.02 to 0.30 and the toroidal field was varied from 5.1 to 5.7 T. Although complicated by the presence of large sawteeth, some electron power deposition results were obtained from a break-in-slope method. These results, together with results from data acquired during the current C-Mod experimental campaign, will be presented and compared to predicted radial deposition profiles from the TORIC, 2-D full wave RF code, and the METS95, 1-D integral wave RF code. (c) 1999 American Institute of Physics.},
doi = {10.1063/1.59714},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 485,
place = {United States},
year = {1999},
month = {9}
}