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Compatibility of lithium plasma-facing surfaces with high edge temperatures in the Lithium Tokamak Experiment.
- Source :
- Physics of Plasmas; 2017, Vol. 24 Issue 5, p1-6, 6p, 1 Diagram, 8 Graphs
- Publication Year :
- 2017
-
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 x 10<superscript>17</superscript> m<superscript>-3</superscript>, consistent with a low recycling metallic lithium boundary. Despite the high edge temperature, the core impurity content is low. Z<superscript>eff</superscript> 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. [ABSTRACT FROM AUTHOR]
- Subjects :
- ELECTRON temperature
PLASMA gases
BOUNDARY value problems
TOKAMAKS
LITHIUM
Subjects
Details
- Language :
- English
- ISSN :
- 1070664X
- Volume :
- 24
- Issue :
- 5
- Database :
- Complementary Index
- Journal :
- Physics of Plasmas
- Publication Type :
- Academic Journal
- Accession number :
- 122825287
- Full Text :
- https://doi.org/10.1063/1.4977916