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

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, William 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.

doi:10.1088/1741-4326/ab537b

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

Journal Article · Wed Nov 27 00:00:00 EST 2019 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ab537b· OSTI ID:1601269

^[1]; Abrams, T. ^[2]; Bykov, I. ^[3]; Donovan, D. C. ^[4]; Duran, J. D. ^[4]; Elder, J. D. ^[5]; Guo, H. Y. ^[2]; Hollmann, E. M. ^[3]; Lasnier, C. J. ^[6]; ^[2]; Moser, A. L. ^[2]; Nichols, J. H. ^[7]; Nygren, R. E. ^[8]; ^[4]; ^[5]; Thomas, D. M. ^[2]; Victor, B. S. ^[6]; Watkins, J. G. ^[8]; ^[8]; Zach, M. P. ^[1] more »

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
General Atomics, San Diego, CA (United States)
Univ. of California, San Diego, CA (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Univ. of Toronto, ON (Canada)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge Inst. for Science and Education (ORISE), Oak Ridge, TN (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
North Carolina State Univ., Raleigh, NC (United States)
Oak Ridge Associated Univ., Oak Ridge, TN (United States)
Auburn Univ., AL (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Univ. of Wisconsin, Madison, WI (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: General Atomics, San Diego, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: Fusion Energy Sciences Postdoctoral Fellowship Program; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC); USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

Grant/Contract Number:: AC04-94AL85000; AC05-00OR22725; AC52-07NA27344; FC02-04ER54698; NA0003525

OSTI ID:: 1601269

Alternate ID(s):: OSTI ID: 1606906
OSTI ID: 1607924
OSTI ID: 1616394
OSTI ID: 23013494

Report Number(s):: GA--54698; LLNL-JRNL--806897; SAND--2020-1019J; 683258

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 1 Vol. 60; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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

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