Progress in controlling ICRF-edge interactions in ASDEX upgrade | Zendy

V. Bobkov | Zendy

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Progress in controlling ICRF-edge interactions in ASDEX upgrade

Author(s) -

V. Bobkov

Publication year - 2015

Publication title -

aip conference proceedings

Language(s) - English

Resource type - Conference proceedings

SCImago Journal Rank - 0.177

H-Index - 75

eISSN - 1551-7616

pISSN - 0094-243X

DOI - 10.1063/1.4936469

Subject(s) - asdex upgrade , antenna (radio) , limiter , voltage , hfss , schottky diode , radio frequency , tokamak , physics , nuclear magnetic resonance , nuclear engineering , optics , materials science , optoelectronics , electrical engineering , plasma , diode , nuclear physics , engineering , microstrip antenna , quantum mechanics

RF measurements during variation of the strap voltage balance of the original 2-strap ICRF antenna in ASDEX Upgrade at constant power are consistent with electromagnetic calculations by HFSS and TOPICA, more so for the latter. RF image current compensation is observed at the antenna limiters in the experiment at a local strap voltage of about half of the value of the remote strap, albeit with a non-negligible uncertainty in phasing. The RF-specific tungsten (W) source at the broad-limiter 2-strap antenna correlates strongly with the RF voltage at the local strap at the locations not connected to opposite side of the antenna along magnetic field lines. The trends of the observed increase of the RF loading with injection of local gas are well described by a combined EMC3-Eirene - FELICE calculations, with the most efficient improvement confirmed for the outer-midplane valves, but underestimated by about 1/3. The corresponding deuterium density tailoring is also likely responsible for the decrease of local W sources observed in the experimen

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