Particle transport in low-collisionality H-mode plasmas on DIII-D

Mordijck, Saskia; Wang, Xin; Doyle, Edward J.; Rhodes, Terry L.; Schmitz, Lothar; Zeng, Lei; Staebler, Gary M.; Petty, Clinton C.; Groebner, Richard J.; Ko, W. -H.; Grierson, Brian A.; Solomon, Wayne M.; Tala, Tuomas; Salmi, Antti; Chrystal, Colin; Diamond, P. H.; McKee, George R.

doi:10.1088/0029-5515/55/11/113025

Title: Particle transport in low-collisionality H-mode plasmas on DIII-D

Journal Article · Mon Oct 05 00:00:00 EDT 2015 · Nuclear Fusion

DOI:https://doi.org/10.1088/0029-5515/55/11/113025· OSTI ID:1345359

Mordijck, Saskia ^[1]; Wang, Xin ^[1]; Doyle, Edward J. ^[2]; Rhodes, Terry L. ^[2]; Schmitz, Lothar ^[2]; Zeng, Lei ^[2]; Staebler, Gary M. ^[3]; Petty, Clinton C. ^[3]; Groebner, Richard J. ^[3]; Ko, W. -H. ^[4]; Grierson, Brian A. ^[5]; Solomon, Wayne M. ^[5]; Tala, Tuomas ^[6]; Salmi, Antti ^[6]; Chrystal, Colin ^[7]; Diamond, P. H. ^[7]; McKee, George R. ^[8]

College of William and Mary, Williamsburg, VA (United States)
Univ. of California, Los Angeles, CA (United States)
General Atomics, San Diego, CA (United States)
National Fusion Research Institute, Daejeon (South Korea)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
VTT Technical Research Centre of Finland, Espoo (Finland)
Univ. of California San Diego, La Jolla, CA (United States)
Univ. of Wisconsin, Madison, WI (United States)

In this article we show that changing from an ion temperature gradient (ITG) to trapped electron mode (TEM) dominant turbulence regime (based on linear gyrokinetic simulations) results experimentally in a strong density pump-out (defined as a reduction in line-averaged density) in low collisionality, low power H-mode plasmas. We vary the turbulence drive by changing the heating from pre-dominantly ion heatedusing neutral beam injection to electron heated using electron cyclotron heating, which changes the T_e/T_i ratio and the temperature gradients. Perturbed gas puff experiments show an increase in transport outside ρ = 0.6, through a strong increase in the perturbed diffusion coefficient and a decrease in the inward pinch. Linear gyrokinetic simulations with TGLF show an increase in the particle flux outside the mid-radius. In conjunction an increase in intermediate-scale length density fluctuations is observed, which indicates an increase in turbulence intensity at typical TEM wavelengths. However, although the experimental changes in particle transport agree with a change from ITG to TEM turbulence regimes, we do not observe a reduction in the core rotation at mid-radius, nor a rotation reversal.

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Research Organization:: College of William and Mary, Williamsburg, VA (United States)

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

Grant/Contract Number:: FC02-04ER54698; SC0007880; FG02-08ER54984; AC02-09CH11466; FG02-07ER54917; FG02-89ER53296; FG02-08ER54999; DAE-FG02-07ER54917; AC2-09CH11466; FG0-08ER54984; FSC0007880

OSTI ID:: 1345359

Alternate ID(s):: OSTI ID: 1238871

Journal Information:: Nuclear Fusion, Vol. 55, Issue 11; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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