Journal article
New Edge Coherent Mode Providing Continuous Transport in Long Pulse H-mode Plasmas
An electrostatic coherent mode near the electron diamagnetic frequency (20–90 kHz) is observed in the steep-gradient pedestal region of long pulse H-mode plasmas in the Experimental Advanced Super-conducting Tokamak, using a newly developed dual gas-puff-imaging system and diamond-coated reciprocating probes.
The mode propagates in the electron diamagnetic direction in the plasma frame with poloidal wavelength of ∼8 cm. The mode drives a significant outflow of particles and heat as measured directly with the probes, thus greatly facilitating long pulse H-mode sustainment. This mode shows the nature of dissipative trapped electron mode, as evidenced by gyrokinetic turbulence simulations.
Language: | English |
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Year: | 2014 |
Pages: | 185004 |
ISSN: | 10797114 and 00319007 |
Types: | Journal article |
DOI: | 10.1103/PhysRevLett.112.185004 |
ORCIDs: | Naulin, Volker , Nielsen, Anders Henry and Juul Rasmussen, Jens |