Scenario development during commissioning operations on the National Spherical Torus Experiment Upgrade

Battaglia, D. J.; Boyer, M. D.; Gerhardt, S.; Mueller, D.; Myers, C. E.; Guttenfelder, W.; Menard, J. E.; Sabbagh, S. A.; Scotti, F.; Bedoya, F.; Bell, R. E.; Berkery, J. W.; Diallo, A.; Ferraro, N.; Kaye, S. M.; Jaworski, M. A.; LeBlanc, B. P.; Ono, M.; Park, J. -K.; Podesta, M.; Raman, R.; Soukhanovskii, V.

doi:10.1088/1741-4326/aaa6e0

Title: Scenario development during commissioning operations on the National Spherical Torus Experiment Upgrade

Journal Article · Tue Feb 20 00:00:00 EST 2018 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/aaa6e0· OSTI ID:1425032

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^[1]; Gerhardt, S. ^[1]; Mueller, D. ^[1];

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^[1]; Sabbagh, S. A. ^[2]; Scotti, F. ^[3]; Bedoya, F. ^[4]; Bell, R. E. ^[1]; Berkery, J. W. ^[2]; Diallo, A. ^[1]; Ferraro, N. ^[1]; Kaye, S. M. ^[1]; Jaworski, M. A. ^[1]; LeBlanc, B. P. ^[1]; Ono, M. ^[1]; Park, J. -K. ^[1];

^[1] more »

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Columbia Univ., New York, NY (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of Illinois, Urbana-Champaign, IL (United States)
Univ. of Washington, Seattle, WA (United States)

The National Spherical Torus Experiment Upgrade (NSTX-U) will advance the physics basis required for achieving steady-state, high-beta, and high-confinement conditions in a tokamak by accessing high toroidal fields (1 T) and plasma currents (1.0–2.0 MA) in a low aspect ratio geometry (A = 1.6–1.8) with flexible auxiliary heating systems (12 MW NBI, 6 MW HHFW). This paper describes the progress in the development of L- and H-mode discharge scenarios and the commissioning of operational tools in the first ten weeks of operation that enable the scientific mission of NSTX-U. Vacuum field calculations completed prior to operations supported the rapid development and optimization of inductive breakdown at different values of ohmic solenoid current. The toroidal magnetic field (B_T0 = 0.65 T) exceeded the maximum values achieved on NSTX and novel long-pulse L-mode discharges with regular sawtooth activity exceeded the longest pulses produced on NSTX (t_pulse > 1.8 s). The increased flux of the central solenoid facilitated the development of stationary L-mode discharges over a range of density and plasma current (I_p). H-mode discharges achieved similar levels of stored energy, confinement (H_98y,2 > 1) and stability (β_N/β_N-nowall > 1) compared to NSTX discharges for I_p ≤ 1 MA. High-performance H-mode scenarios require an L–H transition early in the Ip ramp-up phase in order to obtain low internal inductance (l_i) throughout the discharge, which is conducive to maintaining vertical stability at high elongation (κ > 2.2) and achieving long periods of MHD quiescent operations. Here, the rapid progress in developing L- and H-mode scenarios in support of the scientific program was enabled by advances in real-time plasma control, efficient error field identification and correction, effective conditioning of the graphite wall and excellent diagnostic availability.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Contributing Organization:: the NSTX-U Research, Operations and Engineering Team

Grant/Contract Number:: AC02-09CH11466; AC52-07NA27344

OSTI ID:: 1425032

Alternate ID(s):: OSTI ID: 1771439

Report Number(s):: LLNL-JRNL-820541; TRN: US1802008

Journal Information:: Nuclear Fusion, Vol. 58, Issue 4; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 24 works

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Scenario Development During Commissioning Operations on the National Spherical Torus Experiment Upgrade Battaglia, D.; Boyer, M.; Gerhardt, S. Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States) https://doi.org/10.11578/1562052	dataset	January 2018

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Divertor leg filaments in NSTX-U Scotti, Filippo; Zweben, Stewart; Soukhanovskii, Vlad Nuclear Fusion, Vol. 58, Issue 12 https://doi.org/10.1088/1741-4326/aae49f	journal	October 2018
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Scenario Development During Commissioning Operations on the National Spherical Torus Experiment Upgrade Battaglia, D.; Boyer, M.; Gerhardt, S. Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States) https://doi.org/10.11578/1562052	dataset	January 2018

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