title: A simulation of X-ray shielding for a superconducting electron cyclotron resonance ion source.
abstract: It is generally assumed that large amounts of x-rays are emitted from the ion source of an Electron Cyclotron Resonance (ECR) instrument. The total amount of x-rays should be strictly limited to avoid the extra heat load to the cryostat of the superconducting ECR ion source, since they are partly absorbed by the cold mass into the cryostat. A simulation of x-ray shielding was carried out to determine the effective thickness of the x-ray shield needed via the use of Geant4. X-ray spectra of the 10 GHz Nanogan ECR ion source were measured as a function of the thickness variation in the x-ray shield. The experimental results were compared with Geant4 results to verify the effectiveness of the x-ray shield. Based on the validity in the case of the 10 GHz ECR ion source, the x-ray shielding results are presented by assuming the spectral temperature of the 28 GHz ECR ion source.
authors.affiliation: Busan Center, Korea Basic Science Institute, Busan 609-735, South Korea.
authors.forename: Jin Yong
authors.initials: JY
authors.lastname: Park
authors.affiliation: Busan Center, Korea Basic Science Institute, Busan 609-735, South Korea.
authors.forename: Mi-Sook
authors.initials: MS
authors.lastname: Won
authors.affiliation: Busan Center, Korea Basic Science Institute, Busan 609-735, South Korea.
authors.forename: Byoung-Seob
authors.initials: BS
authors.lastname: Lee
authors.affiliation: Busan Center, Korea Basic Science Institute, Busan 609-735, South Korea.
authors.forename: Jang-Hee
authors.initials: JH
authors.lastname: Yoon
authors.affiliation: Busan Center, Korea Basic Science Institute, Busan 609-735, South Korea.
authors.forename: Seyong
authors.initials: S
authors.lastname: Choi
authors.affiliation: Busan Center, Korea Basic Science Institute, Busan 609-735, South Korea.
authors.forename: Jung-Woo
authors.initials: JW
authors.lastname: Ok
authors.affiliation: Hydrogen Energy Department, Dong-shin University, Naju, Jeonnam 520-714, South Korea.
authors.forename: Jeong-Sik
authors.initials: JS
authors.lastname: Choi
authors.affiliation: Center for Ionizing Radiation, Korea Research Institute of Standards and Science, Daejeon 305-340, South Korea.
authors.forename: Byoung-Chul
authors.initials: BC
authors.lastname: Kim