Bremsstrahlung photons emission in 28-GHz electron cyclotron resonance plasma

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

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    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 time. Another NaI(Tl) detector was placed downstream from the ECR ion source for monitoring photon intensity. The ECR ion source was operated at Radiofrequency (RF) power of 1 kW to extract 16O beam with a dominant fraction of O3+. Bremsstrahlung photons energy spectra were measured at the center of the ECR ion source. 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 unfolding method was based on a full geometry Geant4 model of the ECR ion source. 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.

    Original languageEnglish
    Title of host publicationCYC 2019 - Proceedings of the 22nd International Conference on Cyclotrons and their Applications
    PublisherJACoW Publishing
    Pages220-223
    Number of pages4
    ISBN (Electronic)9783954502059
    DOIs
    Publication statusPublished - 2020
    Event22nd International Conference on Cyclotrons and their Applications, CYC 2019 - Cape Town, South Africa
    Duration: 2019 Sept 222019 Sept 27

    Publication series

    NameCYC 2019 - Proceedings of the 22nd International Conference on Cyclotrons and their Applications

    Conference

    Conference22nd International Conference on Cyclotrons and their Applications, CYC 2019
    Country/TerritorySouth Africa
    CityCape Town
    Period19/9/2219/9/27

    Bibliographical note

    Publisher Copyright:
    © CYC 2019.All rights reserved.

    ASJC Scopus subject areas

    • Atomic and Molecular Physics, and Optics

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