Creation and sustainment of wide pedestal quiescent H-mode with zero net neutral beam torque

Burrell, K. H.; Chen, Xi; Chrystal, C.; Ernst, D. R.; Grierson, B. A.; Haskey, S. R.; Osborne, T. H.; Paz-Soldan, C.; Wilks, T. M.

doi:10.1088/1741-4326/ab940d

Creation and sustainment of wide pedestal quiescent H-mode with zero net neutral beam torque

Journal Article · Fri Jul 03 00:00:00 EDT 2020 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ab940d· OSTI ID:1657515

^[1]; ^[2]; ^[2]; Ernst, D. R. ^[3]; ^[4]; ^[4]; Osborne, T. H. ^[2]; ^[2]; Wilks, T. M. ^[3]

General Atomics, San Diego, CA (United States); General Atomics, Energy & Advanced Concepts, DIII-D
General Atomics, San Diego, CA (United States)
MIT Plasma Science and Fusion Center, Cambridge, MA (United States)
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Recent experiments on DIII-D have shown it is possible to create and sustain wide pedestal quiescent H-mode (QH-mode) plasmas with zero net torque from neutral beam injection (NBI) for the full discharge duration. Wide pedestal QH-mode has many of the features of the previously investigated QH-mode while having the advantage of increased edge pedestal pressure and excellent energy confinement time. Both QH-mode variants operate without edge localized modes. Accordingly, these discharges demonstrate that significant input torque is not essential to the exploitation of wide pedestal QH-mode in future devices that are expected to have small or nonexistent NBI torque. In conclusion, developing operating conditions that allowed net zero torque access to wide pedestal QH-mode required implementing several techniques to avoid locked modes including minimizing intrinsic error fields, avoiding large sawteeth, and driving toroidal rotation via neoclassical toroidal viscosity.

View Accepted Manuscript (DOE)

Research Organization:: General Atomics, San Diego, CA (United States); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

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

Grant/Contract Number:: AC02-09CH11466; FC02-04ER54698; SC0014264

OSTI ID:: 1657515

Alternate ID(s):: OSTI ID: 1636853
OSTI ID: 1663193
OSTI ID: 23018771

Report Number(s):: DOE-GA--54698

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 8 Vol. 60; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Creation and sustainment of wide pedestal quiescent H-mode with zero net neutral beam torque

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