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Title: Localized divertor leakage measurements using isotopic tungsten sources during edge-localized mode-y H-mode discharges on DIII-D

Abstract

Experiments carried out on DIII-D using a novel setup of isotopic tungsten (W) sources in the outer divertor have characterized how the W leakage from this region depends on both the exact source location and edge-localized mode (ELM) behavior. The sources are toroidally-symmetric and poloidally-localized to two regions: (1) the outer strike point (OSP) with natural abundance of W isotopes; and (2) the far-target with highly-enriched 182W isotopes. With the use of a dual-faced collector probe (CP) in the main scrape-off layer (SOL) near the outside midplane and source-rate spectroscopy, a proxy for divertor impurity leakage is developed herein. Using this proxy, it is found that for the OSP W location, there is a nearly linear increase of leakage with the power across the separatrix (), which is consistent with the effect of an increased upstream ion temperature parallel gradient force in the near-SOL; trends in the pedestal density and collisionality are also seen. Conversely, it is found that for the far-target W location leakage falls off rapidly as increases and ELM size decreases, which is suggestive that ELM size plays a role in the leakage from this location. Indications for main SOL W contamination is evidenced by the measurementmore » of large deposition asymmetries on the two opposite CP faces. These measurements are coupled with interpretive modeling showing SOL W accumulation near the separatrix furthest from both targets driven by forces parallel to the magnetic field. This experimental setup, together with the target and upstream W measurements, provides information on the transport from different divertor W source locations and leakage. These studies help to elucidate the physics driving divertor impurity source rates and leakage, with and without ELMs, and provide better insight on the link in the chain connecting wall impurity sources to core impurity levels in magnetic fusion devices.« less

Authors:
ORCiD logo [1];  [2];  [3];  [4];  [4];  [5];  [2];  [3];  [6]; ORCiD logo [2];  [2];  [7];  [8]; ORCiD logo [4]; ORCiD logo [5];  [2];  [6];  [8]; ORCiD logo [8];  [1] more »;  [6];  [8];  [1];  [3]; ORCiD logo [1];  [8];  [9]; ORCiD logo [2];  [10];  [11];  [12];  [13];  [11];  [6];  [2];  [13];  [1];  [2];  [1];  [4] « less
+ Show Author Affiliations
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. General Atomics, San Diego, CA (United States)
  3. Univ. of California, San Diego, CA (United States)
  4. Univ. of Tennessee, Knoxville, TN (United States)
  5. Univ. of Toronto, ON (Canada)
  6. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  7. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge Inst. for Science and Education (ORISE), Oak Ridge, TN (United States)
  8. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  9. North Carolina State Univ., Raleigh, NC (United States)
  10. Oak Ridge Associated Univ., Oak Ridge, TN (United States)
  11. Auburn Univ., AL (United States)
  12. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  13. Univ. of Wisconsin, Madison, WI (United States)
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE National Nuclear Security Administration (NNSA); Fusion Energy Sciences Postdoctoral Fellowship Program
OSTI Identifier:
1607924
Alternate Identifier(s):
OSTI ID: 1601269; OSTI ID: 1606906; OSTI ID: 1616394
Report Number(s):
GA-54698; SAND-2020-1019J; LLNL-JRNL-806897
Journal ID: ISSN 0029-5515; TRN: US2104998
Grant/Contract Number:  
FC02-04ER54698; AC04-94AL85000; NA0003525; AC05-00OR22725; AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 60; Journal Issue: 1; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; impurity transport; divertor; tungsten; DIII-D

Citation Formats

Unterberg, E. A., Abrams, T., Bykov, I., Donovan, D. C., Duran, J. D., Elder, J. D., Guo, H. Y., Hollmann, E. M., Lasnier, C. J., Leonard, A. W., Moser, A. L., Nichols, J. H., Nygren, R. E., Rudakov, D. L., Stangeby, P. C., Thomas, D. M., Victor, B. S., Watkins, J. G., Wampler, W. R., Zach, M. P., Allen, S. L., Barton, J. L., Baylor, L. R., Boedo, J. A., Briesemeister, A. R., Buchenauer, D. A., Coburn, J. D., Chrobak, C. P., Ding, R., Ennis, D. A., Grierson, B. A., Hinson, E. T., Johnson, C. A., McLean, A. G., Petrie, T. W., Schmitz, O., Shiraki, D., Wang, H. Q., Wilcox, R. S., and Zamperini, S. Localized divertor leakage measurements using isotopic tungsten sources during edge-localized mode-y H-mode discharges on DIII-D. United States: N. p., 2019. Web. doi:10.1088/1741-4326/ab537b.
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Unterberg, E. A., Abrams, T., Bykov, I., Donovan, D. C., Duran, J. D., Elder, J. D., Guo, H. Y., Hollmann, E. M., Lasnier, C. J., Leonard, A. W., Moser, A. L., Nichols, J. H., Nygren, R. E., Rudakov, D. L., Stangeby, P. C., Thomas, D. M., Victor, B. S., Watkins, J. G., Wampler, W. R., Zach, M. P., Allen, S. L., Barton, J. L., Baylor, L. R., Boedo, J. A., Briesemeister, A. R., Buchenauer, D. A., Coburn, J. D., Chrobak, C. P., Ding, R., Ennis, D. A., Grierson, B. A., Hinson, E. T., Johnson, C. A., McLean, A. G., Petrie, T. W., Schmitz, O., Shiraki, D., Wang, H. Q., Wilcox, R. S., & Zamperini, S. Localized divertor leakage measurements using isotopic tungsten sources during edge-localized mode-y H-mode discharges on DIII-D. United States. https://doi.org/10.1088/1741-4326/ab537b
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Unterberg, E. A., Abrams, T., Bykov, I., Donovan, D. C., Duran, J. D., Elder, J. D., Guo, H. Y., Hollmann, E. M., Lasnier, C. J., Leonard, A. W., Moser, A. L., Nichols, J. H., Nygren, R. E., Rudakov, D. L., Stangeby, P. C., Thomas, D. M., Victor, B. S., Watkins, J. G., Wampler, W. R., Zach, M. P., Allen, S. L., Barton, J. L., Baylor, L. R., Boedo, J. A., Briesemeister, A. R., Buchenauer, D. A., Coburn, J. D., Chrobak, C. P., Ding, R., Ennis, D. A., Grierson, B. A., Hinson, E. T., Johnson, C. A., McLean, A. G., Petrie, T. W., Schmitz, O., Shiraki, D., Wang, H. Q., Wilcox, R. S., and Zamperini, S. Wed . "Localized divertor leakage measurements using isotopic tungsten sources during edge-localized mode-y H-mode discharges on DIII-D". United States. https://doi.org/10.1088/1741-4326/ab537b. https://www.osti.gov/servlets/purl/1607924.
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@article{osti_1607924,
title = {Localized divertor leakage measurements using isotopic tungsten sources during edge-localized mode-y H-mode discharges on DIII-D},
author = {Unterberg, E. A. and Abrams, T. and Bykov, I. and Donovan, D. C. and Duran, J. D. and Elder, J. D. and Guo, H. Y. and Hollmann, E. M. and Lasnier, C. J. and Leonard, A. W. and Moser, A. L. and Nichols, J. H. and Nygren, R. E. and Rudakov, D. L. and Stangeby, P. C. and Thomas, D. M. and Victor, B. S. and Watkins, J. G. and Wampler, W. R. and Zach, M. P. and Allen, S. L. and Barton, J. L. and Baylor, L. R. and Boedo, J. A. and Briesemeister, A. R. and Buchenauer, D. A. and Coburn, J. D. and Chrobak, C. P. and Ding, R. and Ennis, D. A. and Grierson, B. A. and Hinson, E. T. and Johnson, C. A. and McLean, A. G. and Petrie, T. W. and Schmitz, O. and Shiraki, D. and Wang, H. Q. and Wilcox, R. S. and Zamperini, S.},
abstractNote = {Experiments carried out on DIII-D using a novel setup of isotopic tungsten (W) sources in the outer divertor have characterized how the W leakage from this region depends on both the exact source location and edge-localized mode (ELM) behavior. The sources are toroidally-symmetric and poloidally-localized to two regions: (1) the outer strike point (OSP) with natural abundance of W isotopes; and (2) the far-target with highly-enriched 182W isotopes. With the use of a dual-faced collector probe (CP) in the main scrape-off layer (SOL) near the outside midplane and source-rate spectroscopy, a proxy for divertor impurity leakage is developed herein. Using this proxy, it is found that for the OSP W location, there is a nearly linear increase of leakage with the power across the separatrix (), which is consistent with the effect of an increased upstream ion temperature parallel gradient force in the near-SOL; trends in the pedestal density and collisionality are also seen. Conversely, it is found that for the far-target W location leakage falls off rapidly as increases and ELM size decreases, which is suggestive that ELM size plays a role in the leakage from this location. Indications for main SOL W contamination is evidenced by the measurement of large deposition asymmetries on the two opposite CP faces. These measurements are coupled with interpretive modeling showing SOL W accumulation near the separatrix furthest from both targets driven by forces parallel to the magnetic field. This experimental setup, together with the target and upstream W measurements, provides information on the transport from different divertor W source locations and leakage. These studies help to elucidate the physics driving divertor impurity source rates and leakage, with and without ELMs, and provide better insight on the link in the chain connecting wall impurity sources to core impurity levels in magnetic fusion devices.},
doi = {10.1088/1741-4326/ab537b},
journal = {Nuclear Fusion},
number = 1,
volume = 60,
place = {United States},
year = {Wed Nov 27 00:00:00 EST 2019},
month = {Wed Nov 27 00:00:00 EST 2019}
}
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https://doi.org/10.1088/1741-4326/ab537b
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