Keyword: photon
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TUP028 Bremsstrahlung Photons Emission in 28-GHz Electron Cyclotron Resonance Plasma ECR, ion-source, detector, electron 219
  • M.J. Kumwenda, I.J. Lugendo
    Korea University, Seoul, Republic of Korea
  • J.-K. Ahn, J.W. Lee
    Pusan National University, Pusan, Republic of Korea
  • S.J. Kim, J.Y. Park, M. Won
    Korea Basic Science Institute, Busan, Republic of Korea
  Radial measurements of bremsstrahlung photons show high-energy intensity beyond a critical energy from electron cyclotron resonance (ECR) heating and its nature is not well understood so far. For the first time we have measured the bremsstrahlung photons energy intensity from 28-GHz ECR ion source at Busan Center of KBSI. Three round type NaI(Tl) detectors were used to measure the bremsstrahlung photons emitted at the center of the ECRIS at the same timeThe ECR ion source was operated at Radiofrequency (RF) power of 1 kW to extract 16O beam with a dominant fraction of O3+.We studied possible systematic uncertainties from different characteristics among the three NaI(Tl) detectors by repeating measurements alternatively. Geant4 simulation was performed to take the geometrical acceptance and energy-dependent detection efficiency into account due to large non-uniformity in the material budget. We extracted true bremsstrahlung energy spectra from the 28-GHz ECR ion source using the inverse-matrix unfolding method. The high energy intensities of the bremsstrahlung photons at the center of the ECRIS were explained by the internal structure and shape of ECR plasma.  
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About • paper received ※ 13 September 2019       paper accepted ※ 25 September 2019       issue date ※ 20 June 2020  
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