Predictions of the near edge transport shortfall in DIII-D L-mode plasmas using the trapped gyro-Landau-fluid model [Predictions of the near edge transport shortfall in DIII-D L-mode plasmas using the TGLF model]

Kinsey, Jon E.; Staebler, Gary M.; Candy, Jefferey M.; Petty, Craig C.; Rhodes, Terry L.; Waltz, Ronald E.

doi:10.1063/1.4905630

Title: Predictions of the near edge transport shortfall in DIII-D L-mode plasmas using the trapped gyro-Landau-fluid model [Predictions of the near edge transport shortfall in DIII-D L-mode plasmas using the TGLF model]

Journal Article · Wed Jan 14 00:00:00 EST 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4905630· OSTI ID:1356311

Kinsey, Jon E. ^[1]; Staebler, Gary M. ^[2]; Candy, Jefferey M. ^[2]; Petty, Craig C. ^[2]; Rhodes, Terry L. ^[3];

^[2]

CompX, Del Mar, CA (United States)
General Atomics, San Diego, CA (United States)
Univ. of California, Los Angeles, CA (United States)

Previous studies of DIII-D L-mode plasmas have shown that a transport shortfall exists in that our current models of turbulent transport can significantly underestimate the energy transport in the near edge region. In this paper, the Trapped Gyro-Landau-Fluid (TGLF) drift wave transport model is used to simulate the near edge transport in a DIII-D L-mode experiment designed to explore the impact of varying the safety factor on the shortfall. We find that the shortfall systematically increases with increasing safety factor and is more pronounced for the electrons than for the ions. Within the shortfall dataset, a single high current case has been found where no transport shortfall is predicted. Reduced neutral beam injection power has been identified as the key parameter separating this discharge from other discharges exhibiting a shortfall. Further analysis shows that the energy transport in the L-mode near edge region is not stiff according to TGLF. Unlike the H-mode core region, the predicted temperature profiles are relatively more responsive to changes in auxiliary heating power. In testing the fidelity of TGLF for the near edge region, we find that a recalibration of the collision model is warranted. A recalibration improves agreement between TGLF and nonlinear gyrokinetic simulations performed using the GYRO code with electron-ion collisions. As a result, the recalibration only slightly impacts the predicted shortfall.

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Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: FC02-04ER54698; AC02-09CH11466; FG02-02ER54141; FG02-95ER54309

OSTI ID:: 1356311

Alternate ID(s):: OSTI ID: 1228494

Journal Information:: Physics of Plasmas, Vol. 22, Issue 1; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 22 works

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References (24)

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Verification of GENE and GYRO with L-mode and I-mode plasmas in Alcator C-Mod Mikkelsen, D. R.; Howard, N. T.; White, A. E. Physics of Plasmas, Vol. 25, Issue 4 https://doi.org/10.1063/1.5018741	journal	April 2018
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