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

R. Majeski, R. E. Bell, D. P. Boyle, R. Kaita, T. Kozub, B. P. LeBlanc, M. Lucia, R. Maingi, E. Merino, Y. Raitses, J. C. Schmitt, J. P. Allain, F. Bedoya, J. Bialek, T. M. Biewer, J. M. Canik, L. Buzi, B. E. Koel, M. I. Patino, A. M. Capece & 5 others C. Hansen, T. Jarboe, S. Kubota, W. A. Peebles, K. Tritz

Research output: Contribution to journalArticle

Abstract

High edge electron temperatures (200 eV or greater) have been measured 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 × 1017m−3, consistent with a low recycling metallic lithium boundary. Despite the high edge temperature, the core impurity content is low. Zeff is estimated to be ∼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-β, 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-β is briefly described.

LanguageEnglish (US)
Article number056110
JournalPhysics of Plasmas
Volume24
Issue number5
DOIs
StatePublished - May 1 2017

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compatibility
lithium
recycling
temperature
plasma density
electron energy
gas injection
refueling
neutral beams
injectors
temperature profiles
boundary conditions
impurities
heating
gases

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Majeski, R., Bell, R. E., Boyle, D. P., Kaita, R., Kozub, T., LeBlanc, B. P., ... Tritz, K. (2017). Compatibility of lithium plasma-facing surfaces with high edge temperatures in the Lithium Tokamak Experiment. Physics of Plasmas, 24(5), [056110]. DOI: 10.1063/1.4977916

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.

In: Physics of Plasmas, Vol. 24, No. 5, 056110, 01.05.2017.

Research output: Contribution to journalArticle

Majeski, R, Bell, RE, Boyle, DP, Kaita, R, Kozub, T, LeBlanc, BP, Lucia, M, Maingi, R, Merino, E, Raitses, Y, Schmitt, JC, Allain, JP, Bedoya, F, Bialek, J, Biewer, TM, Canik, JM, Buzi, L, Koel, BE, Patino, MI, Capece, AM, Hansen, C, Jarboe, T, Kubota, S, Peebles, WA & Tritz, K 2017, 'Compatibility of lithium plasma-facing surfaces with high edge temperatures in the Lithium Tokamak Experiment' Physics of Plasmas, vol 24, no. 5, 056110. DOI: 10.1063/1.4977916
Majeski R, Bell RE, Boyle DP, Kaita R, Kozub T, LeBlanc BP et al. Compatibility of lithium plasma-facing surfaces with high edge temperatures in the Lithium Tokamak Experiment. Physics of Plasmas. 2017 May 1;24(5). 056110. Available from, DOI: 10.1063/1.4977916
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./ Compatibility of lithium plasma-facing surfaces with high edge temperatures in the Lithium Tokamak Experiment. In: Physics of Plasmas. 2017 ; Vol. 24, No. 5.
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