Low emittance foil diode studies for the recirculating linear accelerator (RLA)
In recent RLA experiments, a foil diode was utilized, followed by a 1.2-m-long 60-mTorr argon gas cell or lower pressure classical IFR transport region. In order to improve the beam capture and transport efficiency, a number of diode configurations were studied both experimentally and numerically using JASON and the latest version of MAGIC code. In particular, a conical shank diode was investigated in detail. A study of the beam current was undertaken using apertures of gradually increasing I.D. steps of 6.4 mm. An excellent agreement between experiment and simulations was observed. MAGIC predicted the exact total diode current, the current through the different radius apertures, and the beam envelope radius. An optimized diode geometry gave at the anode foil a very cold beam of 1.4 MV, 22.5 kA with an rms beam radius r = 1.5 cm and a geometric emittance epsilon = 0.04 rad.cm. The foil and gas transport region lead always to an increase of beam emittance. A similar design for a 4 MV, 10 kA diode is also presented. 8 refs., 7 figs., 1 tab.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6105104
- Report Number(s):
- SAND-89-0081C; CONF-890665-3; ON: DE89012638
- Resource Relation:
- Conference: 7. Institute of Electrical and Electronics Engineers pulsed power conference, Monterey, CA, USA, 12 Jun 1989; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
DIODE TUBES
DESIGN
LINEAR ACCELERATORS
ANODES
BEAM CURRENTS
BEAM EMITTANCE
BEAM TRANSPORT
CATHODES
COMPUTERIZED SIMULATION
ELECTRON BEAMS
J CODES
M CODES
TRAJECTORIES
ACCELERATORS
BEAMS
COMPUTER CODES
CURRENTS
ELECTRODES
ELECTRON TUBES
LEPTON BEAMS
PARTICLE BEAMS
SIMULATION
430200* - Particle Accelerators- Beam Dynamics
Field Calculations
& Ion Optics