Low emittance foil diode studies for the recirculating linear accelerator (RLA)

Conference · Sat Dec 31 23:00:00 EST 1988

DOI:https://doi.org/10.1109/PPC.1989.767520· OSTI ID:6105104

Mazarakis, M. G.; Poukey, J. W.; Haworth, M. D.; Smith, D. L.; Hasti, D. E.; Pointon, T.; Bennett, L. F.; Lucero, S. J.

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 Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6105104
• Report Number(s): SAND-89-0081C; CONF-890665-3; ON: DE89012638
• Country of Publication: United States
• Language: English

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43 PARTICLE ACCELERATORS
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ACCELERATORS
ANODES
BEAM CURRENTS
BEAM EMITTANCE
BEAM TRANSPORT
BEAMS
CATHODES
COMPUTER CODES
COMPUTERIZED SIMULATION
CURRENTS
DESIGN
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ELECTRODES
ELECTRON BEAMS
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J CODES
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M CODES
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