Performance of the upgraded LBNL AECR ion source
Conference
·
OSTI ID:489692
The LBNL AECR ion source has been upgraded in July 1996 by increasing its magnetic fields to improve its plasma confinement and thereby enhance the source performance. After a few months of tailoring the magnetic field configuration to match the two-frequency plasma heating (14 and 10 GHz), the upgraded AECR ion source (AECR-U) with its higher magnetic fields and higher magnetic mirror ratios has demonstrated significantly enhanced performance. For heavy ions at intensity of about 1 e{mu}A, the charge state was shifted from 42+ to 48+ for uranium and from 41+ to 46+ for bismuth. An order of magnitude enhancement for fully stripped argon ions (I {ge} 60 enA) also has been achieved. Hydrogen-like krypton ions at intensity of about 10{sup 5} pps were extracted from the source and confirmed by measuring its characteristic x-ray with a SiLi crystal detector. High charge state heavy ion beams of xenon-136 and uranium-238 produced with the AECR-U ion source were accelerated by the 88-Inch Cyclotron. Despite poor transmission for the highly charged heavy ions due to vacuum losses in the cyclotron, 11 MeV/nucleon {sup 136}Xe{sup 41+} at 1 x 10{sup 7} pps, 13 MeV/nucleon {sup 136}Xe{sup 46+} at a few hundred pps, and 7 MeV/nucleon {sup 238}U{sup 55+} at 3 x 10{sup 4} pps and 8 MeV/nucleon {sup 238}U{sup 60+} at a few pps were confirmed with a crystal energy detector after extraction from the cyclotron. The total energy of 1.935 GeV of the extracted {sup 238}U{sup 60+} ions is the highest energy ever produced by the 88-Inch Cyclotron. Detailed optimization of the AECR Upgrade will be presented in this paper.
- Research Organization:
- Lawrence Berkeley Lab., CA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (United States)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 489692
- Report Number(s):
- LBNL--40155; CONF-970262--3; ON: DE97007659
- Country of Publication:
- United States
- Language:
- English
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