Design and operation of a 30-kV accelerator for negative ion beams
Holmes, A. J. T. ; Nightingale, M. P. S.
[S.l.] : American Institute of Physics (AIP)
Published 1986
[S.l.] : American Institute of Physics (AIP)
Published 1986
| ISSN: |
1089-7623
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|---|---|
| Source: |
AIP Digital Archive
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| Topics: |
Physics
Electrical Engineering, Measurement and Control Technology
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| Notes: |
A 30-kV triode accelerator has been constructed to test the design and operating characteristics of accelerators for negative hydrogen ion beams. Incorporating both a quadrupole electron trap and an octupole electron suppressor, the accelerator has been used to extract, accelerate, and focus H− ion beams of up to current densities of 20 mA cm−2. The results suggest that this accelerator design is capable of focusing across a wide range of ion current densities (0–20 mA cm−2) and acceleration voltages (15–30 kV) using the variation of a single-gap potential to achieve the required focusing. Applying a bias voltage of up to 2 V between the beam forming electrode and the anode of the source suppresses electrons and has allowed accelerator power efficiencies of over 73% to be obtained for all ion current densities up to 20 mA cm−2 so far extracted. Initial evidence that the extracted and accelerated negative ion beam may be undergoing self-focusing is discussed.
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| Type of Medium: |
Electronic Resource
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| URL: |