Unique Diagnostic Developments with Tracer-encapsulated Pellet Injection

S. Sudo, N. Tamura, D. Kalinina, P. Goncharov, V. Sergeev, K. Sato, S. Muto, S. Inagaki, S. Kato

Research output: Contribution to journalConference articlepeer-review


Unique diagnostic method has been developed with using tracer-encapsulated pellet (TESPEL) injection. TESPEL consists of polystyrene as an outer shell and of specific material as a tracer. The diameter of the shell is 400 - 900 μm. The amount of the trace varies from on ball with diameter of 100 μm to 8 balls with the same diameter each. The special features of TESPEL injection into the plasma are: (a) local deposition inside the plasma, (b) the deposited amount of the tracer in the plasma can be known precisely, (c) relatively wide selection of tracer material is possible. The achievements of TESPEL experiments on LHD are: Impurity transport properties such as diffusion coefficient D and inward pinch velocity V were obtained for the various conditions of the plasma, From the cold pulse propagation due to TESPEL injection, heat diffusivity χgas obtained, and the remarkable difference of χ in the magnetic island and outside of that, TESPEL injection suggested that particle flow feature was found to be different in and outside of the magnetic island, TESPEL gives the reference for the absolute intensity of spectroscopic light, Through pellet charge exchange process (PCX), high energy particles have been observed. Thus, the TESPEL injection method is proved to be very useful for impurity transport investigation including magnetic island feature, heat transport study including magnetic island region, and also high energy particle study.

Original languageEnglish
Number of pages1
JournalIEEE International Conference on Plasma Science
Publication statusPublished - Oct 17 2003
Externally publishedYes
Event2003 IEEE International Conference on Plasma Science - Jeju, Korea, Republic of
Duration: Jun 2 2003Jun 5 2003

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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