Calcium and lithium ion production for laser ion source [electronic resource].
- Washington, D.C. : United States. Dept. of Energy. Office of Nuclear Physics, 2015. and Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
- Physical Description:
- 5 pages : digital, PDF file
- Additional Creators:
- Brookhaven National Laboratory, United States. Department of Energy. Office of Nuclear Physics, and United States. Department of Energy. Office of Scientific and Technical Information
- Restrictions on Access:
- Free-to-read Unrestricted online access
- Calcium and lithium ion beams are required by NASA Space Radiation Laboratory (NSRL) at Brookhaven National Laboratory (BNL) to simulate the effects of cosmic radiation. To find out difficulties to provide such high reactive material as laser targets, the both species were experimentally tested. Plate-shaped lithium and calcium targets were fabricated to create ablation plasmas with a 6ns, 1064nm Nd:YAG 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 then used to analyze the 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 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 10sec, 30sec, 60sec, and 120sec interval lengths, showing a linear relation between the interval time and the amount of oxygen in the beam.
- Published through SciTech Connect., 08/23/2015., "bnl--108440-2015-cp", "KB0202011", 87 2 ISSN 0034--6748, 16. International Conference on Ion Sources (ICIS2015), New York, NY (United States), 23-28 Aug 2015., and Okamura M.; Palm, K.; Stifler, C.; Steski, D.; Ikeda, S.; Kumaki, M.; Kanesue, T.
- Funding Information:
- SC00112704, KBCH139, and 18033
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