Angular distributions of bremsstrahlung photons from ECR plasma

M. J. Kumwenda, J. K. Ahn, J. W. Lee, I. J. Lugendo, S. J. Kim, J. Y. Park, M. S. Won

Research output: Contribution to journalArticlepeer-review


High-energy bremsstrahlung photon emission beyond a critical energy from electron cyclotron resonance (ECR) heating has long attracted much attention, and its nature has yet been unsolved. We have measured bremsstrahlung photons from the 28-GHz ECR ion source at Busan Center of Korean Basic Science Institute. The gamma-ray detection system consists of three NaI(Tl) scintillation detectors placed 62 cm radially from the beam axis and a NaI(Tl) scintillation detector at the extraction port for monitoring the photon intensity along the beam axis. Bremsstrahlung photon energy spectra were measured at nine azimuthal angles at the RF power of 1 kW. Azimuthal angular distributions of bremsstrahlung photons were found to be in coincidence with the structure the ECR ion source and the shape of ECR plasma.

Original languageEnglish
Pages (from-to)780-784
Number of pages5
JournalJournal of the Korean Physical Society
Issue number11
Publication statusPublished - 2017 Dec 1

Bibliographical note

Funding Information:
The authors would like to gratefully acknowledge support by National Research Foundation of Korea and Korea University.

Publisher Copyright:
© 2017, The Korean Physical Society.


  • Bremsstrahlung photons
  • ECR ion source
  • Microwave power
  • NaI(TI) detector

ASJC Scopus subject areas

  • General Physics and Astronomy


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