Electron cyclotron emission from optically thin plasma in compact helical system

Hiroshi Idei, Shin Kubo, Minoru Hosokawa, Harukazu Iguchi, Kunizo Ohkubo, Teruyuki Sato

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


A frequency spectrum of second harmonic electron cyclotron emission was observed for an optically thin plasma produced by fundamental electron cyclotron heating in a compact helical system. A radial electron temperature profile deduced from this spectrum neglecting the multiple reflections effect shows a clear difference from that measured by Thomson scattering. We relate the spectrum with the electron temperature profile by the modified emission model including the scrambling effect. The scrambling effect results from both mode conversion and change in the trajectory due to multiple reflections of the emitting ray at the vessel wall. The difference between the two temperature profiles is explained well by using the modified emission model. Reconstruction of the electron temperature profile from the spectrum using this model is also discussed.

Original languageEnglish
Pages (from-to)1543-1549
Number of pages7
JournalJapanese journal of applied physics
Issue number3R
Publication statusPublished - Mar 1994
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Engineering
  • General Physics and Astronomy


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