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Title: A simulation of X-ray shielding for a superconducting electron cyclotron resonance ion source

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:
; ; ; ; ;  [1] ;  [2] ;  [3]
  1. Busan Center, Korea Basic Science Institute, Busan 609-735 (Korea, Republic of)
  2. Hydrogen Energy Department, Dong-shin University, Naju, Jeonnam 520-714 (Korea, Republic of)
  3. Center for Ionizing Radiation, Korea Research Institute of Standards and Science, Daejeon 305-340 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22253664
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 2; Conference: ICIS 2011: 14. international conference on ion sources, Giardini-Naxos, Sicily (Italy), 12-16 Sep 2011; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; CRYOSTATS; ECR ION SOURCES; ELECTRON CYCLOTRON-RESONANCE; GHZ RANGE 01-100; HEATING LOAD; SHIELDING; SHIELDS; SIMULATION; THICKNESS; X RADIATION; X-RAY SPECTRA