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Title: Electron pressure balance in the SOL through the transition to detachment

Abstract

Upgrades to core and divertor Thomson scattering (DTS) diagnostics at DIII-D have provided measurements of electron pressure profiles in the lower divertor from attached- to fully-detached divertor plasma conditions. Detailed, multistep sequences of discharges with increasing line-averaged density were run at several levels of P inj. Strike point sweeping allowed 2D divertor characterization using DTS optimized to measure T e down to 0.5 eV. The ionization front at the onset of detachment is found to move upwards in a controlled manner consistent with the indication that scrape-off layer parallel power flux is converted from conducted to convective heat transport. Measurements of n e, T e and p e in the divertor versus Lparallel demonstrate a rapid transition from Te ≥ 15 eV to ≤3 eV occurring both at the outer strike point and upstream of the X-point. Furthermore, these observations provide a strong benchmark for ongoing modeling of divertor detachment for existing and future tokamak devices.

Authors:
 [1];  [2];  [2];  [3];  [1];  [4];  [2];  [5];  [1];  [4];  [1];  [1];  [1];  [2];  [2];  [2];  [1];  [6];  [6];  [5] more »;  [7] « less
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. General Atomics, San Diego, CA (United States)
  3. Aalto Univ., Espoo (Finland)
  4. Univ. of California San Diego, La Jolla, CA (United States)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. Univ. of Toronto Institute for Aerospace Studies, Toronto (Canada)
  7. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1265737
Alternate Identifier(s):
OSTI ID: 1252232
Grant/Contract Number:  
AC05-00OR22725; AC52-07NA27344; FC02-04ER54698; FG02-07ER54917; AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 463; Journal Issue: C; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

McLean, A. G., Leonard, A. W., Makowski, M. A., Groth, M., Allen, S. L., Boedo, J. A., Bray, B. D., Briesemeister, A. R., Carlstrom, T. N., Eldon, D., Fenstermacher, M. E., Hill, D. N., Lasnier, C. J., Liu, C., Osborne, T. H., Petrie, T. W., Soukhanovskii, V. A., Stangeby, P. C., Tsui, C., Unterberg, E. A., and Watkins, J. G. Electron pressure balance in the SOL through the transition to detachment. United States: N. p., 2015. Web. doi:10.1016/j.jnucmat.2015.01.066.
McLean, A. G., Leonard, A. W., Makowski, M. A., Groth, M., Allen, S. L., Boedo, J. A., Bray, B. D., Briesemeister, A. R., Carlstrom, T. N., Eldon, D., Fenstermacher, M. E., Hill, D. N., Lasnier, C. J., Liu, C., Osborne, T. H., Petrie, T. W., Soukhanovskii, V. A., Stangeby, P. C., Tsui, C., Unterberg, E. A., & Watkins, J. G. Electron pressure balance in the SOL through the transition to detachment. United States. doi:10.1016/j.jnucmat.2015.01.066.
McLean, A. G., Leonard, A. W., Makowski, M. A., Groth, M., Allen, S. L., Boedo, J. A., Bray, B. D., Briesemeister, A. R., Carlstrom, T. N., Eldon, D., Fenstermacher, M. E., Hill, D. N., Lasnier, C. J., Liu, C., Osborne, T. H., Petrie, T. W., Soukhanovskii, V. A., Stangeby, P. C., Tsui, C., Unterberg, E. A., and Watkins, J. G. Sat . "Electron pressure balance in the SOL through the transition to detachment". United States. doi:10.1016/j.jnucmat.2015.01.066. https://www.osti.gov/servlets/purl/1265737.
@article{osti_1265737,
title = {Electron pressure balance in the SOL through the transition to detachment},
author = {McLean, A. G. and Leonard, A. W. and Makowski, M. A. and Groth, M. and Allen, S. L. and Boedo, J. A. and Bray, B. D. and Briesemeister, A. R. and Carlstrom, T. N. and Eldon, D. and Fenstermacher, M. E. and Hill, D. N. and Lasnier, C. J. and Liu, C. and Osborne, T. H. and Petrie, T. W. and Soukhanovskii, V. A. and Stangeby, P. C. and Tsui, C. and Unterberg, E. A. and Watkins, J. G.},
abstractNote = {Upgrades to core and divertor Thomson scattering (DTS) diagnostics at DIII-D have provided measurements of electron pressure profiles in the lower divertor from attached- to fully-detached divertor plasma conditions. Detailed, multistep sequences of discharges with increasing line-averaged density were run at several levels of Pinj. Strike point sweeping allowed 2D divertor characterization using DTS optimized to measure Te down to 0.5 eV. The ionization front at the onset of detachment is found to move upwards in a controlled manner consistent with the indication that scrape-off layer parallel power flux is converted from conducted to convective heat transport. Measurements of ne, Te and pe in the divertor versus Lparallel demonstrate a rapid transition from Te ≥ 15 eV to ≤3 eV occurring both at the outer strike point and upstream of the X-point. Furthermore, these observations provide a strong benchmark for ongoing modeling of divertor detachment for existing and future tokamak devices.},
doi = {10.1016/j.jnucmat.2015.01.066},
journal = {Journal of Nuclear Materials},
number = C,
volume = 463,
place = {United States},
year = {2015},
month = {2}
}

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