skip to main content

SciTech ConnectSciTech Connect

Title: Calcium and lithium ion production for laser ion source

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.
Authors:
; ; ; ; ; ;
Publication Date:
OSTI Identifier:
1222619
Report Number(s):
BNL--108440-2015-CP
Journal ID: ISSN 0034--6748; R&D Project: KBCH139; 18033; KB0202011; TRN: US1601465
DOE Contract Number:
SC00112704
Resource Type:
Conference
Resource Relation:
Journal Volume: 87; Journal Issue: 2; Conference: 16. International Conference on Ion Sources (ICIS2015), New York, NY (United States), 23-28 Aug 2015
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 36 MATERIALS SCIENCE; NEODYMIUM LASERS; CALCIUM IONS; LITHIUM IONS; OXYGEN; BNL; ION BEAMS; LITHIUM; CALCIUM; CHARGE STATES; OXIDATION; ION SOURCES; LASER TARGETS; CLEANING; POWER DENSITY; ABLATION; PLASMA; PLATES; SURFACES