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Title: Calcium and lithium ion production for laser ion source

Calcium and lithium ion beams are required by NASA Space Radiation Laboratory at Brookhaven National Laboratory to simulate the effects of cosmic radiation. To identify the difficulties in providing such highly reactive materials as laser targets, both species were experimentally tested. Plate shaped lithium and calcium targets were fabricated to create ablation plasmas with a 6 ns 1064 nm neodymium-doped yttrium aluminum garnet laser. We found significant oxygen contamination in both the Ca and Li high charge state beams due to the rapid oxidation of the surfaces. A large spot size, low power density laser was used to create low charge state beams without scanning the targets. The low charge state Ca beam did not have any apparent oxygen contamination, showing the potential to clean the target entirely of oxide with a low power beam once in the chamber. The Li target was clearly still oxidizing in the chamber after each low power shot. To measure the rate of oxidation, we shot the low power laser at the target repeatedly at 10 s, 30 s, 60 s, and 120 s interval lengths, showing a linear relation between the interval time and the amount of oxygen in the beam.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ; ;  [1] ;  [5] ;  [2] ;  [5] ;  [2]
  1. Collider-Accelerator Department, Brookhaven National Laboratory, Upton, New York 11973 (United States)
  2. (Japan)
  3. Department of Physics, Cornell University, Ithaca, New York 14853-2501 (United States)
  4. Engineering Physics Systems Department, Providence College, Providence, Rhode Island 02918 (United States)
  5. Nishina Center for Accelerator-Based Science, RIKEN, Saitama (Japan)
Publication Date:
OSTI Identifier:
22482903
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 87; Journal Issue: 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ABLATION; BEAMS; CALCIUM; CHARGE STATES; COSMIC RADIATION; DOPED MATERIALS; GARNETS; ION SOURCES; LASER TARGETS; LASERS; LITHIUM IONS; NASA; NEODYMIUM; OXIDATION; OXIDES; OXYGEN; PLASMA; YTTRIUM