High-purity intense lithium-ion-beam sources using glow-discharge cleaning techniques
- Laboratory of Plasma Studies, Cornell University, Ithaca, New York 14853 (United States)
High purity, 1 MV, 50 ns, 300 A/cm[sup 2] lithium beams have been produced using an extraction diode driven by Cornell's Light Ion Accelerator. Both passive and active anodes were studied with the highest-purity beams being generated by active anodes. These anodes were approximately 200 cm[sup 2] in area and consisted of 0.1 [mu]m films of Al and LiF evaporated onto a glass substrate. The anode plasma was formed by using a plasma opening switch to divert 50 kA from the main power pulse through the Al foil for 20 ns. Without glow-discharge cleaning, the ion beam produced by the LiF Al anode was over 55% hydrogen and only 20% Li[sup +]. In order to remove impurities, especially the hydrogen, the anodes were cleaned with a 110 mA, 33 W, 60 Hz glow discharge. The stoichiometry of the ion beam after discharge cleaning was 65% Li[sup +], 20% Al[sup +2], and 15% H[sup +]. The results are presented and a model of the cleaning mechanism is discussed.
- OSTI ID:
- 6245187
- Journal Information:
- Journal of Applied Physics; (United States), Vol. 74:6; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
Ta
ION SOURCES
LITHIUM IONS
ALUMINIUM
ANODES
BEAM EXTRACTION
CLEANING
GLOW DISCHARGES
IMPURITIES
LITHIUM FLUORIDES
PLASMA SWITCHES
ALKALI METAL COMPOUNDS
CHARGED PARTICLES
ELECTRIC DISCHARGES
ELECTRICAL EQUIPMENT
ELECTRODES
ELEMENTS
EQUIPMENT
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
IONS
LITHIUM COMPOUNDS
LITHIUM HALIDES
METALS
SWITCHES
661220* - Particle Beam Production & Handling
Targets- (1992-)