Fast wave direct electron heating in advanced inductive and ITER baseline scenario discharges in DIII-D

Journal Article · Wed Feb 12 00:00:00 EST 2014 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4864518· OSTI ID:1373719

Pinsker, R. I. ^[1]; Austin, M. E. ^[2]; Diem, S. J. ^[3]; Doyle, E. J. ^[4]; Grierson, B. A. ^[5]; Hosea, J. C. ^[5]; Jackson, G. L. ^[1]; Kaufman, M. C. ^[3]; Luce, T. C. ^[1]; Maggiora, R. ^[6]; Milanesio, D. ^[6]; Nagy, A. ^[5]; Perkins, R. ^[5]; Politzer, P. A. ^[1]; Porkolab, M. ^[7]; Ryan, P. M. ^[3]; Solomon, W. M. ^[5]; Taylor, G. ^[5]; Turco, F. ^[8]; Zeng, L. ^[4]

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1. General Atomics, San Diego, CA (United States)
2. Univ. of Texas at Austin, Austin, TX (United States)
3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
4. Univ. of California, Los Angeles, CA (United States)
5. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
6. Politecnico di Torino, Torino (Italy)
7. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
8. Columbia Univ., New York, NY (United States)

Fast Wave (FW) heating and electron cyclotron heating (ECH) are used in the DIII-D tokamak to study plasmas with low applied torque and dominant electron heating characteristic of burning plasmas. FW heating via direct electron damping has reached the 2.5 MW level in high performance ELMy H-mode plasmas. In Advanced Inductive (AI) plasmas, core FW heating was found to be comparable to that of ECH, consistent with the excellent first-pass absorption of FWs predicted by ray-tracing models at high electron beta. FW heating at the ~2 MW level to ELMy H-mode discharges in the ITER Baseline Scenario (IBS) showed unexpectedly strong absorption of FW power by injected neutral beam (NB) ions, indicated by significant enhancement of the D-D neutron rate, while the intended absorption on core electrons appeared rather weak. As a result, the AI and IBS discharges are compared in an effort to identify the causes of the different response to FWs.

• Research Organization: General Atomics, San Diego, CA (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: FC02-04ER54698
• OSTI ID: 1373719
• Journal Information: AIP Conference Proceedings, Vol. 1580, Issue 1; Conference: 20th Top. Conf. on Radio Frequency Power in Plasmas, Sorrento (Italia), 25-28 Jun 2013; ISSN 0094-243X
• Publisher: American Institute of Physics (AIP)
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ion cyclotron heating
electron damping
high harmonics
Neutron absorption
H mode
Plasma heating
ECR heating
Plasma waves