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Negative ion production in a large semicylindrical ion source.
- Source :
-
Review of Scientific Instruments . Apr92, Vol. 63 Issue 4, p2699. 3p. - Publication Year :
- 1992
-
Abstract
- A large semicylindrical negative ion source, whose dimensions are 34 cm in diameter and 104 em in length, has been developed. By optimizing a chamber depth and a filter strength, a H[sup -] current of 650 mA (7.7 mA/cm²) was obtained at an arc condition of 1.3 Pa, 70 V, and 1200 A. In order to increase the H[sup -] current and to reduce an operating pressure, a small amount of Cs was injected. As a result, the H[sup -] current was increased from 550 mA (6.5 mA/cm²) to 850 mA (10 mA/cm²) under an are power of 70 V×800 A. The most significant feature of the cesium effect was the reduction of the operating pressure. With maintaining the sufficient current of 670 mA (8 mA/cm²), the operating pressure could be lowered to 0.03 Pa. At this pressure, the highest gas efficiency of 20% was achieved. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ION sources
*ANIONS
*NUCLEAR physics instruments
Subjects
Details
- Language :
- English
- ISSN :
- 00346748
- Volume :
- 63
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- Review of Scientific Instruments
- Publication Type :
- Academic Journal
- Accession number :
- 9780769
- Full Text :
- https://doi.org/10.1063/1.1142827