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TY - CONF AU - Kumwenda, M.J. AU - Ahn, J.-K. ED - McIntosh, Peter ED - Burt, Graeme ED - Apsimon, Robert ED - Schaa, Volker R.W. TI - Unfolding of Bremsstrahlung Photons Energy Spectra Emitted from Electron Cyclotron Resonance Ion Source J2 - Proc. of LINAC2022, Liverpool, UK, 28 August-02 September 2022 CY - Liverpool, UK T2 - International Linear Accelerator Conference T3 - 31 LA - english AB - The aim of present study is to determine end-point energies of the bremsstrahlung photons energy spectra emitted from 28-GHz ECRIS by using inverse-matrix unfold method. Azimuthal angular distribution of the bremsstrahlung photons from 28-GHz ECRIS were measured at Busan Center of KBSI. Gamma-ray detection system consists of three round type NaI(Tl) scintillation detectors positioned 62 cm radially from the beam axis and another detector placed at the extraction port for monitoring photon intensity along the beam axis. Bremsstrahlung photons energy spectra were measured at six azimuthal angles at RF power of 1 kW. Monte Carlo simulation based on Geant4 package 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 using the inverse-matrix unfolding method. The end-point energies of the bremsstrahlung photons after application of deconvolution method were found to be 1.320±0.050 MeV, 1.530±0.070 MeV, 1.540±0.070 MeV, 1.690±0.030 MeV, 1.530±0.070 MeV and 1.690±0.030 MeV for 0°, 30°, 60°, 90°, 120° and 330°, respectively. PB - JACoW Publishing CP - Geneva, Switzerland SP - 750 EP - 752 KW - ECR KW - photon KW - plasma KW - electron KW - detector DA - 2022/09 PY - 2022 SN - 2226-0366 SN - 978-3-95450-215-8 DO - doi:10.18429/JACoW-LINAC2022-THPOPA04 UR - https://jacow.org/linac2022/papers/thpopa04.pdf ER -