Role of density gradient driven trapped electron mode turbulence in the H-mode inner core with electron heating

Ernst, D. R.; Burrell, K. H.; Guttenfelder, W.; Rhodes, T. L.; Dimits, A. M.; Bravenec, R.; Grierson, B. A.; Holland, C.; Lohr, J.; Marinoni, A.; McKee, G. R.; Petty, C. C.; Rost, J. C.; Schmitz, L.; Wang, G.; Zemedkun, S.; Zeng, L.

doi:10.1063/1.4948723

Role of density gradient driven trapped electron mode turbulence in the H-mode inner core with electron heating

Journal Article · Tue May 10 00:00:00 EDT 2016 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4948723· OSTI ID:1372301

Ernst, D. R. ^[1]; Burrell, K. H. ^[2]; Guttenfelder, W. ^[3]; Rhodes, T. L. ^[4]; Dimits, A. M. ^[5]; Bravenec, R. ^[6]; Grierson, B. A. ^[3]; Holland, C. ^[7]; Lohr, J. ^[2]; Marinoni, A. ^[8]; McKee, G. R. ^[9]; Petty, C. C. ^[2]; Rost, J. C. ^[8]; Schmitz, L. ^[4]; Wang, G. ^[4]; Zemedkun, S. ^[10]; Zeng, L. ^[4]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center; General Atomics
General Atomics, San Diego, CA (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Univ. of California, Los Angeles, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Fourth State Research, Austin, TX (United States)
Univ. of California, San Diego, CA (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
Univ. of Wisconsin, Madison, WI (United States)
Univ. of Colorado, Boulder, CO (United States)

In a series of DIII-D [J. L. Luxon, Nucl. Fusion 42 614 (2002)] low torque quiescent H-mode experiments show that density gradient driven TEM (DGTEM) turbulence dominates the inner core of H-Mode plasmas during strong electron cyclotron heating (ECH). By adding 3.4 MW ECH doubles T_e/T_i from 0.5 to 1.0, which halves the linear DGTEM critical density gradient, locally reducing density peaking, while transport in all channels displays extreme stiffness in the density gradient. This then suggests fusion -heating may degrade inner core confinement in H-Mode plasmas with moderate density peaking and low collisionality, with equal electron and ion temperatures, key conditions expected in burning plasmas. Gyrokinetic simulations using GYRO [J. Candy and R. E. Waltz, J. Comp. Phys. 186 545 (2003)] (and GENE [F. Jenko et al., Phys. Plasmas 7, 1904 (2000)]) closely match not only particle, energy, and momentum fluxes, but also density fluctuation spectra from Doppler Backscattering (DBS), with and without ECH. Inner core DBS density fluctuations display discrete frequencies with adjacent toroidal mode numbers, which we identify as DGTEMs. GS2 [W. Dorland et al., Phys. Rev. Lett. 85 5579 (2000)] predictions show the DGTEM can be suppressed, to avoid degradation with electron heating, by broadening the current density profile to attain q₀ > q_min > 1.

View Accepted Manuscript (DOE)

Research Organization:: General Atomics, San Diego, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

Contributing Organization:: the DIII-D Team

Grant/Contract Number:: AC02-05CH11231; AC02-09CH11466; AC52-07NA27344; FC02-04ER54698; FC02-08ER54966; FG02-08ER54984; FG02-08ER54999; SC0006957

OSTI ID:: 1372301

Alternate ID(s):: OSTI ID: 1252336
OSTI ID: 1469449

Report Number(s):: LLNL-JRNL--747552

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 23; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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