Electron pressure balance in the SOL through the transition to detachment

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.

doi:10.1016/j.jnucmat.2015.01.066

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

Journal Article · Sat Feb 07 00:00:00 EST 2015 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2015.01.066· OSTI ID:1265737

McLean, A. G. ^[1]; Leonard, A. W. ^[2]; Makowski, M. A. ^[2]; Groth, M. ^[3]; Allen, S. L. ^[1]; Boedo, J. A. ^[4]; Bray, B. D. ^[2]; Briesemeister, A. R. ^[5]; Carlstrom, T. N. ^[1]; Eldon, D. ^[4]; Fenstermacher, M. E. ^[1]; Hill, D. N. ^[1]; Lasnier, C. J. ^[1]; Liu, C. ^[2]; Osborne, T. H. ^[2]; Petrie, T. W. ^[2]; Soukhanovskii, V. A. ^[1]; Stangeby, P. C. ^[6]; Tsui, C. ^[6]; Unterberg, E. A. ^[5] more »

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
General Atomics, San Diego, CA (United States)
Aalto Univ., Espoo (Finland)
Univ. of California San Diego, La Jolla, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Toronto Institute for Aerospace Studies, Toronto (Canada)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

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.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725; AC52-07NA27344; FC02-04ER54698; FG02-07ER54917; AC04-94AL85000

OSTI ID:: 1265737

Alternate ID(s):: OSTI ID: 1252232

Journal Information:: Journal of Nuclear Materials, Vol. 463, Issue C; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 44 works

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References (9)

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Cited By (10)

Compatibility of separatrix density scaling for divertor detachment with H-mode pedestal operation in DIII-D Leonard, A. W.; McLean, A. G.; Makowski, M. A. Nuclear Fusion, Vol. 57, Issue 8 https://doi.org/10.1088/1741-4326/aa778c	journal	July 2017
Divertor impurity seeding experiments at the COMPASS tokamak Komm, M.; Khodunov, I.; Cavalier, J. Nuclear Fusion, Vol. 59, Issue 10 https://doi.org/10.1088/1741-4326/ab34d2	journal	September 2019
The role of particle, energy and momentum losses in 1D simulations of divertor detachment Dudson, B. D.; Allen, J.; Body, T. arXiv https://doi.org/10.48550/arxiv.1812.09402	text	January 2018
Testing the role of molecular physics in dissipative divertor operations through helium plasmas at DIII-D Canik, J. M.; Briesemeister, A. R.; McLean, A. G. Physics of Plasmas, Vol. 24, Issue 5 https://doi.org/10.1063/1.4982057	journal	May 2017
Controlling marginally detached divertor plasmas Eldon, D.; Kolemen, E.; Barton, J. L. Nuclear Fusion, Vol. 57, Issue 6 https://doi.org/10.1088/1741-4326/aa6b16	journal	May 2017
The role of particle, energy and momentum losses in 1D simulations of divertor detachment Dudson, B. D.; Allen, J.; Body, T. Plasma Physics and Controlled Fusion, Vol. 61, Issue 6 https://doi.org/10.1088/1361-6587/ab1321	journal	May 2019
First experimental tests of a new small angle slot divertor on DIII-D Guo, H. Y.; Wang, H. Q.; Watkins, J. G. Nuclear Fusion, Vol. 59, Issue 8 https://doi.org/10.1088/1741-4326/ab26ee	journal	July 2019
Developing physics basis for the snowflake divertor in the DIII-D tokamak Soukhanovskii, V. A.; Allen, S. L.; Fenstermacher, M. E. Nuclear Fusion, Vol. 58, Issue 3 https://doi.org/10.1088/1741-4326/aaa6de	journal	February 2018
A review of direct experimental measurements of detachment Boedo, J.; McLean, A. G.; Rudakov, D. L. Plasma Physics and Controlled Fusion, Vol. 60, Issue 4 https://doi.org/10.1088/1361-6587/aaa2ec	journal	February 2018
Plasma detachment in divertor tokamaks Leonard, A. W. Plasma Physics and Controlled Fusion, Vol. 60, Issue 4 https://doi.org/10.1088/1361-6587/aaa7a9	journal	February 2018

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