Supersonic Gas Injector for Plasma Fueling in the National Spherical Torus Experiment

Soukhanovskii, V. A.; Blanchard, W. R.; Dong, J. K.; Kaita, R.; Kugel, H. W.; Menard, J. E.; Provost, T. J.; Raman, R.; Roquemore, A. L.; Sichta, P.

doi:10.1080/15361055.2018.1502034

Title: Supersonic Gas Injector for Plasma Fueling in the National Spherical Torus Experiment

Journal Article · Mon Sep 10 00:00:00 EDT 2018 · Fusion Science and Technology

DOI:https://doi.org/10.1080/15361055.2018.1502034· OSTI ID:1488794

^[1]; Blanchard, W. R. ^[2]; Dong, J. K. ^[2]; Kaita, R. ^[2]; Kugel, H. W. ^[2];

^[2]; Provost, T. J. ^[2]; Raman, R. ^[3]; Roquemore, A. L. ^[2]; Sichta, P. ^[2]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Univ. of Washington, Seattle, WA (United States)

A supersonic gas injector (SGI) has been developed for fueling and diagnostic applications on the National Spherical Torus Experiment (NSTX). It is comprised of a graphite converging-diverging Laval nozzle and a commercial piezoelectric gas valve mounted on a movable probe at a low-field-side midplane port location. Also mounted on the probe is a diagnostic package: a Langmuir probe, two thermocouples, and five pick-up coils for measuring toroidal, radial, vertical magnetic field components and magnetic fluctuations at the location of the SGI tip. The SGI flow rate is up to 33.25 Pa m³/ (1.75 × 10²² euterium particles/s), comparable to conventional NSTX gas injectors. The nozzle operates in a pulsed regime at room temperature and a reservoir gas pressure up to 665 kPa (5000 Torr). The deuterium jet Mach number of about 4 and the divergence half-angle of 5 to 25 deg have been measured in laboratory experiments simulating the NSTX environment. Reliable operation of the SGI and all mounted diagnostics at distances 0.01 to 0.20 m from the plasma separatrix has been demonstrated in NSTX experiments. The SGI has been used for fueling of ohmic and 2- to 4-MW neutral beam injection–heated L- and H-mode plasmas. Fueling efficiency in the range 0.1 to 0.3 has been obtained from the plasma electron inventory analysis. In conclusion, the SGI-fueling–based plasma discharge scenarios enabling better density control have been developed.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1488794

Report Number(s):: LLNL-JRNL-750482; 935757

Journal Information:: Fusion Science and Technology, Vol. 75, Issue 1; ISSN 1536-1055

Publisher:: American Nuclear SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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References (31)

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Supersonic gas injector for fueling and diagnostic applications on the National Spherical Torus Experiment Soukhanovskii, V. A.; Kugel, H. W.; Kaita, R. Review of Scientific Instruments, Vol. 75, Issue 10 https://doi.org/10.1063/1.1787579	journal	October 2004
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