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Title: Spectroscopic Characterization and Simulation of Chemical Sputtering Using the DiMES Porous Plug Injector in DIII-D

Abstract

A self-contained gas injection system for the Divertor Material Evaluation System (DiMES) on DIII-D has been employed for in-situ study of chemical erosion in the tokamak divertor environment. The Porous Plug Injector (PPI) releases methane, a major component of molecular influx due to chemical sputtering of graphite, from the tile surface into the plasma at a controlled rate through a porous graphite surface. Perturbation to local plasma is minimized, while also simulating the immediate environment of methane molecules released from a solid graphite surface. The release rate was chosen to be of the same order of magnitude as natural sputtering. Photon efficiencies of CH{sub 4} for measured local plasma conditions are reported. The contribution of chemical versus physical sputtering to the source of C{sup +} at the target is assessed through measurement of CII and CD/CH band emissions during release of CH{sub 4} from the PPI, and due to intrinsic emission.

Authors:
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Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
940148
Report Number(s):
UCRL-JRNL-221438
TRN: US0806930
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Journal Article
Journal Name:
Journal of Nuclear Material, vol. 363-365, N/A, June 15, 2007, pp. 86-90
Additional Journal Information:
Journal Volume: 363-365
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; DIVERTORS; DOUBLET-3 DEVICE; EVALUATION; GAS INJECTION; GRAPHITE; METHANE; PHOTONS; PLASMA; SIMULATION; SPUTTERING; TARGETS

Citation Formats

McLean, A G, Davis, J W, Stangeby, P C, Brooks, N H, Whyte, D G, Allen, S L, Bray, B D, Brezinsek, S, Elder, J D, Fenstermacher, M E, Groth, M, Haasz, A A, Hollmann, E M, Isler, R, Lasnier, C J, Rudakov, D L, Watkins, J G, West, W P, and Wong, C C. Spectroscopic Characterization and Simulation of Chemical Sputtering Using the DiMES Porous Plug Injector in DIII-D. United States: N. p., 2006. Web.
McLean, A G, Davis, J W, Stangeby, P C, Brooks, N H, Whyte, D G, Allen, S L, Bray, B D, Brezinsek, S, Elder, J D, Fenstermacher, M E, Groth, M, Haasz, A A, Hollmann, E M, Isler, R, Lasnier, C J, Rudakov, D L, Watkins, J G, West, W P, & Wong, C C. Spectroscopic Characterization and Simulation of Chemical Sputtering Using the DiMES Porous Plug Injector in DIII-D. United States.
McLean, A G, Davis, J W, Stangeby, P C, Brooks, N H, Whyte, D G, Allen, S L, Bray, B D, Brezinsek, S, Elder, J D, Fenstermacher, M E, Groth, M, Haasz, A A, Hollmann, E M, Isler, R, Lasnier, C J, Rudakov, D L, Watkins, J G, West, W P, and Wong, C C. 2006. "Spectroscopic Characterization and Simulation of Chemical Sputtering Using the DiMES Porous Plug Injector in DIII-D". United States. https://www.osti.gov/servlets/purl/940148.
@article{osti_940148,
title = {Spectroscopic Characterization and Simulation of Chemical Sputtering Using the DiMES Porous Plug Injector in DIII-D},
author = {McLean, A G and Davis, J W and Stangeby, P C and Brooks, N H and Whyte, D G and Allen, S L and Bray, B D and Brezinsek, S and Elder, J D and Fenstermacher, M E and Groth, M and Haasz, A A and Hollmann, E M and Isler, R and Lasnier, C J and Rudakov, D L and Watkins, J G and West, W P and Wong, C C},
abstractNote = {A self-contained gas injection system for the Divertor Material Evaluation System (DiMES) on DIII-D has been employed for in-situ study of chemical erosion in the tokamak divertor environment. The Porous Plug Injector (PPI) releases methane, a major component of molecular influx due to chemical sputtering of graphite, from the tile surface into the plasma at a controlled rate through a porous graphite surface. Perturbation to local plasma is minimized, while also simulating the immediate environment of methane molecules released from a solid graphite surface. The release rate was chosen to be of the same order of magnitude as natural sputtering. Photon efficiencies of CH{sub 4} for measured local plasma conditions are reported. The contribution of chemical versus physical sputtering to the source of C{sup +} at the target is assessed through measurement of CII and CD/CH band emissions during release of CH{sub 4} from the PPI, and due to intrinsic emission.},
doi = {},
url = {https://www.osti.gov/biblio/940148}, journal = {Journal of Nuclear Material, vol. 363-365, N/A, June 15, 2007, pp. 86-90},
number = ,
volume = 363-365,
place = {United States},
year = {2006},
month = {5}
}