Compatibility of lithium plasma-facing surfaces with high edge temperatures in the Lithium Tokamak Experiment

Majeski, R.; Bell, R. E.; Boyle, D. P.; Kaita, R.; Kozub, T.; LeBlanc, B. P.; Lucia, M.; Maingi, R.; Merino, E.; Raitses, Y.; Schmitt, J. C.; Allain, J. P.; Bedoya, F.; Bialek, J.; Biewer, T. M.; Canik, J. M.; Buzi, L.; Koel, B. E.; Patino, M. I.; Capece, A. M.; Hansen, C.; Jarboe, T.; Kubota, S.; Peebles, W. A.; Tritz, K.

doi:10.1063/1.4977916

Title: Compatibility of lithium plasma-facing surfaces with high edge temperatures in the Lithium Tokamak Experiment

Journal Article · Mon Mar 20 00:00:00 EDT 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4977916· OSTI ID:1367354

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^[1]; Kozub, T. ^[1]; LeBlanc, B. P. ^[1];

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^[1]; Merino, E. ^[1];

^[1]; Schmitt, J. C. ^[1]; Allain, J. P. ^[2]; Bedoya, F. ^[2]; Bialek, J. ^[3];

^[4]; Canik, J. M. ^[4]; Buzi, L. ^[5];

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^[5]; Capece, A. M. ^[6] more »

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Univ. of Illinois, Urbana-Champaign, IL (United States)
Columbia Univ., New York, NY (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Princeton Univ., NJ (United States)
College of New Jersey, Ewing, NJ (United States)
Univ. of Washington, Seattle, WA (United States)
Univ. of California, Los Angeles, CA (United States)
Johns Hopkins Univ., Baltimore, MD (United States)

We measured high edge electron temperatures (200 eV or greater) at the wall-limited plasma boundary in the Lithium Tokamak Experiment (LTX). Flat electron temperature profiles are a long-predicted consequence of low recycling boundary conditions. Plasma density in the outer scrape-off layer is very low, 2-3 x 10(17) m(-3), consistent with a low recycling metallic lithium boundary. In spite of the high edge temperature, the core impurity content is low. Z(eff) is estimated to be similar to 1.2, with a very modest contribution (< 0.1) from lithium. Experiments are transient. Gas puffing is used to increase the plasma density. After gas injection stops, the discharge density is allowed to drop, and the edge is pumped by the low recycling lithium wall. An upgrade to LTX-LTX-beta, which includes a 35A, 20 kV neutral beam injector (on loan to LTX from Tri-Alpha Energy) to provide core fueling to maintain constant density, as well as auxiliary heating, is underway. LTX-beta is briefly described.

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Research Organization:: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC02-09CH11466; AC05-00OR22725

OSTI ID:: 1367354

Alternate ID(s):: OSTI ID: 1348032

Report Number(s):: PPPL-5325; PHPAEN

Journal Information:: Physics of Plasmas, Vol. 24, Issue 5; Conference: 58th Annual Meeting of the APS-Division-of-Plasma-Physics (DPP), San Jose, CA (United States), 31 Oct - 4 Nov 2016; Related Information: The digital data for this paper can be found at http://arks.princeton.edu/ark:/88435/dsp01x920g025r.; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 19 works

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References (10)

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Cited By (4)

Millimeter-wave interferometry and far-forward scattering for density fluctuation measurements on LTX- β Kubota, S.; Majeski, R.; Boyle, D. P. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5039418	journal	October 2018
Potential Impacts of Liquid-Metal Plasma-Facing Components on Heating and Current Drive Actuators for a Fusion Nuclear Science Facility Wallace, G. M.; Kessel, C. E.; Hosea, J. Fusion Science and Technology, Vol. 76, Issue 1 https://doi.org/10.1080/15361055.2019.1629253	journal	July 2019
Alternative Plasma-Facing-Material Concepts for Extreme Plasma-Burning Nuclear Fusion Environments Allain, J. P. Fusion Science and Technology, Vol. 75, Issue 7 https://doi.org/10.1080/15361055.2019.1647030	journal	October 2019
Results from an improved flowing liquid lithium limiter with increased flow uniformity in high power plasmas in EAST Zuo, G. Z.; Hu, J. S.; Maingi, R. Nuclear Fusion, Vol. 59, Issue 1 https://doi.org/10.1088/1741-4326/aaedcb	journal	November 2018

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