H/sup -/ source development at ANL
The H/sup -/ source development program at ANL has produced the first operational source for direct H/sup -/ injection into a proton synchrotron and is now directed toward the development of a 30 Hz H/sup -/ source for booster injection into a synchroton. On October 1, 1976, direct injection of 50 MeV H/sup -/ ions into the ANL Zero Gradient Synchrotron (ZGS) and stripping of the H/sup -/ to obtain protons for acceleration to full energy became the normal mode of operation. With >6 mA of 50 MeV H/sup -/ beam injected and approximately 10/sup 12/ protons per mA accelerated to full energy during each cycle, new ZGS intensity records have been established. In the operational tandem-acceleration H/sup -/ source, a single-aperture source grid is followed by a multislot parallel-ribbon extraction grid. Full and fractional energy H/sup -/ ions derived from H/sup +/, H/sub 2//sup +/ and H/sub 3//sup +/ are produced by electron attachment in a target gas consisting of the hydrogen outflow from the plasma source. Power dissipation in the extractor grid, and lifetime considerations, limit the repetition rate to approximately 1 Hz. A source which uses two or more aligned multiaperture grids to minimize grid dissipation is being developed for 30 Hz injection into the rapid-cycling booster-injector for the ZGS.
- Research Organization:
- Argonne National Lab., IL (USA)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 7107524
- Report Number(s):
- CONF-770313-39
- Country of Publication:
- United States
- Language:
- English
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