Novel ion acceleration tube design
This paper describes a 280-kV constant-gradient positive-ion acceleration tube in which the interelectrode voltage is established with a voltage divider chain of resistors that is mounted inside the vacuum of the tube. A single glass pipe serves as the vacuum envelope, flat aluminum disks are used for the tube electrodes, and resistance-paint-coated plastic cylinders compose the voltage divider chain. These construction features simplify tube construction and keep manufacturing costs low. During high-voltage tests, interelectrode voltage was estimated to deviate less than +- 6% from uniformity, heat was adequately dissipated from the vacuum-mounted resistors, and the maximum design acceleration voltage of 280 kV was held. Furthermore, preliminary ion acceleration trials yielded from 0.7 ..mu..A of N/sup +//sub 2/ at 50 kV to 1.5 ..mu..A at 280 kV. The accelerated-beam cross section, as viewed on a ground quartz screen, remained stationary during those trials, indicating that the tube configuration provided adequate shielding of the beam from asymmetric charges on the interior insulating walls of the tube.
- Research Organization:
- Department of Electrical Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2G7
- OSTI ID:
- 6262800
- Journal Information:
- Rev. Sci. Instrum.; (United States), Journal Name: Rev. Sci. Instrum.; (United States) Vol. 55:11; ISSN RSINA
- Country of Publication:
- United States
- Language:
- English
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