Plasma and Fusion Research
Online ISSN : 1880-6821
ISSN-L : 1880-6821
Rapid Communications
Direct Measurements of High Harmonic Fast Wave Profile in the UTST Spherical Tokamak Plasma
Takuma WAKATSUKIYoshihiko NAGASHIMATakuya OOSAKOHiroaki KOBAYASHIByung Il ANHidetoshi KAKUDATakuma YAMADARyota IMAZAWAOsamu WATANABETakashi YAMAGUCHIHiroki KURASHINAHiroyuki HAYASHIKotaro YAMADATakuya SAKAMOTOKentaro HANASHIMAJunichi HIRATSUKAShuji KAMIORyuma HIHARAKeita ABEMorio SAKUMURAQinghong CAOMichiaki INOMOTOYasushi ONOAkira EJIRIYuichi TAKASE
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2010 Volume 5 Pages 018

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Abstract
The spatial distribution of the radiofrequency (RF) magnetic field associated with a high harmonic fast wave (HHFW) was measured using an array of magnetic probes in the plasma inside the University of Tokyo Spherical Tokamak (UTST). Data obtained from 25 probes (19 locations for toroidal polarization and 6 locations for vertical polarization) distributed along the poloidal cross section were analyzed. The RF magnetic field is polarized in the toroidal direction, indicating that the HHFW is excited in the plasma. The RF field is weak on the inboard side. Analysis of the group delay suggests that the waves travel long distances in the plasma, probably because of poor absorption. No indication of parametric decay was observed up to 80 kW of injected RF power.
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© 2010 by The Japan Society of Plasma Science and Nuclear Fusion Research
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