The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
TY - UNPB AU - Kumwenda, M.J. ED - Schaa, Volker RW TI - Angular Distributions of Bremsstrahlung X-ray Emission from ECR Plasma J2 - Proc. of ECRIS2016, Busan, Korea, August 28 - September 1, 2016 C1 - Busan, Korea T2 - International Workshop on ECR Ion Sources T3 - 22 LA - english AB - High-energy X-ray emission beyond a critical energy from ECR heating has long attracted much attention and its nature has yet been unsolved. We have measured bremsstrahlung X-rays from the 28-GHz ECR ion source at Busan Center of KBSI. The gamma-ray detection system consists of three NaI(Tl) scintillation detectors placed 55 cm radially from the beam axis at the extraction port, and a NaI(Tl) scintillation detector for monitoring X-ray intensity at the beam axis. Bremsstrahlung X-ray energy spectra were measured at 9 azimuthal angular regions at RF power of 1kW. We also measured bremsstrahlung X-rays by exchanging detector positions for studying systematic uncertainties. Detection efficiency and shielding effect are taken into account for extracting real X-ray energy spectra from measured ones, based on Geant4 simulation results. Preliminary results on the azimuthal angular distributions of bremsstrahlung X-rays with respect to energy region will be presented. PB - JACoW CP - Geneva, Switzerland ER -