Correlation of Neutral Beam Injection Parameters and Core B with Anomalous First-Wall Heating During QH-Mode

Journal Article · Mon May 15 00:00:00 EDT 2006 · Journal of Nuclear Materials

OSTI ID:940154

Lasnier, C; Burrell, K; deGrassie, J; Rhodes, T; VanZeeland, M; Watkins, J

Anomalous first-wall heating has been observed far from the divertor strike point during QH-mode in DIII-D, with measured heat flux comparable to that at the outer strike point. The data are consistent with deuterium ions of approximately the pedestal energy carrying the anomalous heat flux. Although an instability has not been identified that is correlated with the anomalous heat flux, two classes of behavior have been observed: one in which the anomalous heat flux depends linearly on core {beta}, and another class with no {beta}-dependence. The anomalous heat flux depends strongly on the injected beam energy of the non-tangentially-injected neutral beams but not that of the tangential beams.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 940154
• Report Number(s): UCRL-JRNL-221459; JNUMAM; TRN: US0806935
• Journal Information: Journal of Nuclear Materials, Vol. 363-365; ISSN 0022-3115
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION
BEAM INJECTION
DEUTERIUM IONS
DIVERTORS
FIRST WALL
HEAT FLUX
HEATING
INSTABILITY