Particle transport diagnostics on CHS and LHD with tracer-encapsulated solid pellet injection

Details Particle transport diagnostics on CHS and LHD with tracer-encapsulated solid pellet injection Particle transport diagnostics on CHS and LHD with tracer-encapsulated solid pellet injection

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apro16005k&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

For measuring local particle transport in LHD plasmas, a new diagnostic method has been implemented based on injection of tracer-encapsulated solid pellet. TESPEL consists of impurity tracer core encapsulated in a polystyrene shell. This configuration allows a non-intrinsic impurity tracer to reach the inner plasma. The local deposition was confirmed by both observation with photo multipliers and CCD imaging. Having the lithium tracer deposited locally, the subsequent diffusion was observed in experiments on CHS device by visible CXRS with heating NBI as a source. In case of LHD, the visible CXRS is unfeasible because of the small cross section of the charge exchange for a higher energy neutral beam. Instead, diffusion of titanium tracer was observed by measuring Kα emission without the need for a neutral beam. Simulation by an impurity transport code fitted quite well the experimental signals, which allowed the diffusion coefficient D to be determined. This demonstrates the applicability of the new diagnostic method for both a low-Z material (Li) and a light metal (Ti) as a tracer.

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