Duopigatron ion source studies: II
Recent experimental studies with a duopigatron gas discharge ion source are described. Experiments include measurements of the ion current, mass and energy distributions and current density profiles as a function of the aperture sizes of the source electrodes. Larger aperture diameters were required to minimize damage to the original ion source (configuration described in Rev. Sci. Instrum. 49, 435(1978)) observed during its operation on the Sandia Target Test Facility. The best new configuration produces a 200 mA ion beam at an arc current of 13 A and contains 52% D/sup +/. In addition to the performance measurements, extensive mass analyses of the ionic impurities produced in the ion source were carried out. The large aperture sources produce beams that contain ca. 0.5% contaminants. Typical mass spectra are described and the sources of the impurities discussed. Difficulties with the duopigatron including loss of source efficiency (ion current as a function of arc current) and filament contamination are presented and discussed.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6416747
- Report Number(s):
- SAND-81-0845; TRN: 81-011897
- Country of Publication:
- United States
- Language:
- English
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