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Title: Sheath physics study using the divertor materials evaluation system (DIMES) on DIII-D

Abstract

A set of 19 dome-shaped divertor Langmuir probes similar in design to probes used in JET and JT-60 has been used successfully in DIII-D to measure the divertor electron temperature, particle flux, and floating potential. A comparison of the power flux using IR cameras with the particle flux and electron temperature from the probes using collisionless sheath theory has indicated that the particle flux to the divertor surface may be strongly modified by collisions within the magnetic sheath. In order to study this effect, a set of probes have been designed that can be inserted into the divertor plasma using DIMES. Two dome-shaped probes compare fluxes intercepted both above and within the magnetic sheath of the divertor surface. In addition, a third probe oriented normal to the magnetic field is used to verify the projected area of the probe surface. The probe design accommodates parallel power fluxes up to 50 MW/m[sup 2] for 30 ms, allowing for the study of beam-heated plasmas in DIII-D.

Authors:
; ;  [1]; ;  [2]; ;  [3];  [4]
  1. Sandia National Laboratories, Livermore, California 94551 (United States)
  2. Sandia National Laboratories, Albuquerque, New Mexico 87106 (United States)
  3. General Atomics, San Diego, California 92186 (United States)
  4. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
Publication Date:
OSTI Identifier:
6690400
DOE Contract Number:  
AC04-94AL85000; AC03-89ER51114; W-7405-ENG-48
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments; (United States)
Additional Journal Information:
Journal Volume: 66:1; Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; TOKAMAK DEVICES; PLASMA DIAGNOSTICS; ELECTRON TEMPERATURE; FLUX DENSITY; ION TEMPERATURE; LANGMUIR PROBE; PARTICLE KINEMATICS; CLOSED PLASMA DEVICES; ELECTRIC PROBES; PROBES; THERMONUCLEAR DEVICES; 700320* - Plasma Diagnostic Techniques & Instrumentation- (1992-)

Citation Formats

Buchenauer, D, Cuthbertson, J W, Whaley, J A, Miller, J D, Watkins, J G, Junge, R, West, W P, and Hill, D N. Sheath physics study using the divertor materials evaluation system (DIMES) on DIII-D. United States: N. p., 1995. Web. doi:10.1063/1.1146236.
Buchenauer, D, Cuthbertson, J W, Whaley, J A, Miller, J D, Watkins, J G, Junge, R, West, W P, & Hill, D N. Sheath physics study using the divertor materials evaluation system (DIMES) on DIII-D. United States. https://doi.org/10.1063/1.1146236
Buchenauer, D, Cuthbertson, J W, Whaley, J A, Miller, J D, Watkins, J G, Junge, R, West, W P, and Hill, D N. 1995. "Sheath physics study using the divertor materials evaluation system (DIMES) on DIII-D". United States. https://doi.org/10.1063/1.1146236.
@article{osti_6690400,
title = {Sheath physics study using the divertor materials evaluation system (DIMES) on DIII-D},
author = {Buchenauer, D and Cuthbertson, J W and Whaley, J A and Miller, J D and Watkins, J G and Junge, R and West, W P and Hill, D N},
abstractNote = {A set of 19 dome-shaped divertor Langmuir probes similar in design to probes used in JET and JT-60 has been used successfully in DIII-D to measure the divertor electron temperature, particle flux, and floating potential. A comparison of the power flux using IR cameras with the particle flux and electron temperature from the probes using collisionless sheath theory has indicated that the particle flux to the divertor surface may be strongly modified by collisions within the magnetic sheath. In order to study this effect, a set of probes have been designed that can be inserted into the divertor plasma using DIMES. Two dome-shaped probes compare fluxes intercepted both above and within the magnetic sheath of the divertor surface. In addition, a third probe oriented normal to the magnetic field is used to verify the projected area of the probe surface. The probe design accommodates parallel power fluxes up to 50 MW/m[sup 2] for 30 ms, allowing for the study of beam-heated plasmas in DIII-D.},
doi = {10.1063/1.1146236},
url = {https://www.osti.gov/biblio/6690400}, journal = {Review of Scientific Instruments; (United States)},
issn = {0034-6748},
number = ,
volume = 66:1,
place = {United States},
year = {1995},
month = {1}
}