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Experiments on ion cyclotron damping at the deuterium fourth harmonic in DIII-D

Technical Report ·
DOI:https://doi.org/10.2172/354995· OSTI ID:354995
;  [1];  [2]; ;  [3];  [4];  [5];  [6]
  1. General Atomics, San Diego, CA (United States)
  2. Oak Ridge National Lab., TN (United States)
  3. Princeton Plasma Physics Lab., NJ (United States)
  4. Univ. of California, Irvine, CA (United States)
  5. Univ. of California, San Diego, CA (United States)
  6. Massachusetts Inst. of Tech., Cambridge, MA (United States)
+ Show Author Affiliations
Absorption of fast Alfven waves by the energetic ions of an injected beam is evaluated in the DIII-D tokamak. Ion cyclotron resonance absorption at the fourth harmonic of the deuteron cyclotron frequency is observed with deuterium neutral beam injection (f = 60 MHz, B{sub T} = 1.9 T). Enhanced D-D neutron rates are evidence of absorption at the Doppler-shifted cyclotron resonance. Characteristics of global energy confinement provide further proof of substantial beam acceleration by the rf. In many cases, the accelerated deuterons cause temporary stabilization of the sawtooth (monster sawteeth), at relatively low rf power levels of {approximately}1 MW.
Research Organization:
General Atomics, San Diego, CA (United States); Univ. of California, Irvine, CA (United States); Oak Ridge National Lab., TN (United States); Princeton Plasma Physics Lab., NJ (United States); Univ. of California, San Diego, CA (United States); Massachusetts Inst. of Technology, Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Energy Research, Washington, DC (United States)
DOE Contract Number:
AC03-99ER54463; W-7405-ENG-48; AC05-96OR22464; AC02-76CH03073; FC03-95ER54299; FG02-90ER54084
OSTI ID:
354995
Report Number(s):
GA--A23092; CONF-990411--; ON: DE99003185
Country of Publication:
United States
Language:
English

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALFVEN WAVES
BEAM INJECTION HEATING
CYCLOTRON HARMONICS
DAMPING
DEUTERIUM
DOUBLET-3 DEVICE
ENERGY ABSORPTION
EXPERIMENTAL DATA
HIGH-FREQUENCY HEATING
SAWTOOTH OSCILLATIONS
STABILIZATION