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epr_2014_poster_schmitt_p19_31.pdf2014-08-21 12:27:16John Schmitt
epr_2014_poster_schmitt_p11_18.pdf2014-08-21 12:26:46John Schmitt
epr_2014_poster_schmitt_p1_10.pdf2014-08-21 12:26:05John Schmitt

Overview of the Diagnostic Set for the Lithium Tokamak Experiment (LTX)

Author: John C Schmitt
Requested Type: Poster Only
Submitted: 2014-05-30 14:23:50

Co-authors: R. Bell, D. Boyle, A. Capece, A. Diallo, E. Granstedt, C. M. Jacobson, R. Kaita, B. Koel, T. Kozub, S. Lazerson, B. LeBlanc, M. Lucia, R. Maingi, R. Majeski, E. Merino, G. Tchilingurian, (PPPL), J. Bialek, (Columbia), T. M. Biewer, J. M. Canik, T. K. Gray

Contact Info:
Princeton Plasma Physics Laboratory
100 Stellarator Road
Princeton, NJ   08540

Abstract Text:
The Lithium Tokamak Experiment (LTX) is a low aspect ratio spherical tokamak with a close-fitting low-recycling first wall conformal to the last closed flux surface. The wall is comprised of four stainless steel-lined copper shells onto which lithium is evaporated. The shells can be heated to keep the lithium in a liquid state. Approximately 80% of the surface area of the plasma column faces a lithium-coated wall, and the remaining area is space that is available for diagnostic access. The diagnostic capabilities on LTX continue to improve. An extensive array of magnetic diagnostics compatible with high temperature operation and exposure to lithium is now functioning and is used for basic plasma operations and equilibrium reconstructions (2D and 3D). The Thomson scattering system is being realigned and additional edge Thomson channels are being brought online. Along with a vast spectroscopic diagnostic set, which will be discussed briefly, two 20 AXUV-diode arrays provide full radial coverage at the toroidal midplane. One array is for bolometry and the other is filtered for Ly-alpha measurements. Poloidal and toroidal views for the ChERS system enhance the ability to measure the ion temperature and plasma flow profiles. A single-channel 1 mm interferometer and a multi-channel microwave reflectometer have been installed for measuring density profiles. Langmuir probes have been installed at a variety of poloidal and toroidal locations. The Materials Analysis and Particle Probe (MAPP) is installed and provides crucial information about the surface conditions of the plasma-facing wall. A quartz crystal microbalance is used to measure the thickness of the evaporated lithium coatings. The rest of the existing diagnostic tools (i.e. Fast cameras, RGAs etc.) available on LTX are presented.

This work is supported by US DOE contracts DE-AC02-09CH11466 and DE-AC05-00OR22725.

Characterization: 1.4

Group with other LTX posters.

Workshop on Exploratory Topics in Plasma and Fusion Research (EPR) and US-Japan Compact Torus (CT) Workshop
August 5-8, 2014
Madison, Wisconsin

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