The phase-space dependence of fast-ion interaction with tearing modes

Heidbrink, William W.; Bardoczi, Laszlo; Collins, Cami S.; Kramer, Gerrit J.; La Haye, Robert J.; Lin, D. J.; Muscatello, Christopher M.; Podesta, Mario; Stagner, Luke; Van Zeeland, Michael A.; Zhu, Yubao

doi:10.1088/1741-4326/aab7b6

Title: The phase-space dependence of fast-ion interaction with tearing modes

Journal Article · Tue Jul 03 00:00:00 EDT 2018 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/aab7b6· OSTI ID:1429876

Heidbrink, William W. ^[1]; Bardoczi, Laszlo ^[2]; Collins, Cami S. ^[3]; Kramer, Gerrit J. ^[4]; La Haye, Robert J. ^[5]; Lin, D. J. ^[6]; Muscatello, Christopher M. ^[3];

^[7]; Stagner, Luke ^[1]; Van Zeeland, Michael A. ^[8]; Zhu, Yubao ^[1]

Univ. of California, Irvine, CA (United States). Department of Physics and Astronomy
Oak Ridge Associated Univ., Oak Ridge, TN (United States)
General Atomics, San Diego, CA (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
General Atomics, San Diego, CA (United States). Inertial Fusion Technology
Univ. of California, Irvine, CA (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States). NSTX
General Atomics, San Diego, CA, United States of America

Modulation of various neutral beam sources probes the interaction of fast ions with tearing modes (TM) in the DIII-D tokamak. As measured by electron cyclotron emission, the (m,n) = (2,1) tearing modes have an island width of ~8 cm and change phase 180 at the q = 2 surface. (Here, m is the poloidal mode number and n is the toroidal mode number.) Deuterium neutral beam injection by six sources with differing injection geometries produces the fast ions. To study the interaction in different parts of phase space, on successive discharges, one of the six sources is modulated at 20 Hz to populate different fast-ion orbits. The modulation only changes the island width by a few millimeters, implying that any fast-ion effect on mode stability is below detection limits. When compared to the expected signals in the absence of TM-induced transport, both the average and modulated neutron signals deviate, implying that fast-ion transport occurs in much of phase space. Fast-ion D-α (FIDA) measurements detect reductions in signal at wavelengths that are sensitive to counter-passing ions. Neutral particle analyzer data imply poor confinement of trapped fast ions. Lastly, calculations of the expected fast-ion transport that use measured TM properties successfully reproduce the data.

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

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

Grant/Contract Number:: FC02-04ER54698

OSTI ID:: 1429876

Report Number(s):: DOE-GA-54698; TRN: US1802485

Journal Information:: Nuclear Fusion, Vol. 58, Issue 8; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 23 works

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