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; C. Hansen; T. Jarboe; S. Kubota; W. A. Peebles; K. Tritz

doi:10.1063/1.4977916

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. CapeceC. Hansen, T. Jarboe, S. Kubota, W. A. Peebles, K. Tritz

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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. Z_eff 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.

Original language	English (US)
Article number	056110
Journal	Physics of Plasmas
Volume	24
Issue number	5
DOIs	https://doi.org/10.1063/1.4977916
State	Published - May 1 2017

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1063/1.4977916

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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., ... Tritz, K. (2017). Compatibility of lithium plasma-facing surfaces with high edge temperatures in the Lithium Tokamak Experiment. Physics of Plasmas, 24(5), Article 056110. https://doi.org/10.1063/1.4977916

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

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.",

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

note = "Publisher Copyright: {\textcopyright} 2017 Author(s).",

year = "2017",

month = may,

day = "1",

doi = "10.1063/1.4977916",

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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. https://doi.org/10.1063/1.4977916

TY - JOUR

T1 - Compatibility of lithium plasma-facing surfaces with high edge temperatures in the Lithium Tokamak Experiment

AU - Majeski, R.

AU - Bell, R. E.

AU - Boyle, D. P.

AU - Kaita, R.

AU - Kozub, T.

AU - LeBlanc, B. P.

AU - Lucia, M.

AU - Maingi, R.

AU - Merino, E.

AU - Raitses, Y.

AU - Schmitt, J. C.

AU - Allain, J. P.

AU - Bedoya, F.

AU - Bialek, J.

AU - Biewer, T. M.

AU - Canik, J. M.

AU - Buzi, L.

AU - Koel, B. E.

AU - Patino, M. I.

AU - Capece, A. M.

AU - Hansen, C.

AU - Jarboe, T.

AU - Kubota, S.

AU - Peebles, W. A.

AU - Tritz, K.

PY - 2017/5/1

Y1 - 2017/5/1

N2 - 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.

AB - 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.

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UR - http://www.scopus.com/inward/citedby.url?scp=85016166125&partnerID=8YFLogxK

U2 - 10.1063/1.4977916

DO - 10.1063/1.4977916

M3 - Article

AN - SCOPUS:85016166125

SN - 1070-664X

VL - 24

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 5

M1 - 056110

ER -

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

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