Electron diodes and cavity design for the new 4-MeV injector of the recirculating linear accelerator (RLA)
We have designed and constructed four types of electron-beam diodes for the new 4-MV RLA injector: a non-immersed foilless diode, a magnetically immersed foilless diode, a foil diode and an ion-focused diode. They are tailored to fit the new injector cavity. The design goals were to produce high quality 10-kA to 20-kA electron beams with a {beta}{perpendicular} smaller than 0.2 and a beam radius of the order of 2 cm. These beams will be matched to the RLA IFR channel so {beta}{perpendicular} must be equal to or smaller than the square root of the ratio of the beam current versus Alfven current for f{sub e} = 1. A reentrant anode geometry was selected for the injector cavity design, because it offers substantial savings on the required amount of ferromagnetic cores. The inner radius of the outside shell, now only 30 cm, would have been twice as large (60 cm) if a coaxial nonreentrant geometry had been adopted. The shape of the anode and cathode electrodes were carefully selected to minimize the electric field stresses. The field stresses on the inner surface of the outer shell do not exceed 200 kV/cm. 6 refs., 8 figs.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- Sponsoring Organization:
- DOD; DOE/DP
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6659952
- Report Number(s):
- SAND-90-1268C; CONF-9009200--2; ON: DE90016224
- Country of Publication:
- United States
- Language:
- English
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