Compound-lens injector for a 19-MeV, 700-kA electron beam

Conference · Thu Dec 31 04:00:00 EST 1992

OSTI ID:10157261

Sanford, T W.L.; Poukey, J W; Halbleib, J A ^[1]; Mock, R C ^[2]

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1. Sandia National Labs., Albuquerque, NM (United States)
2. K-Tech Corp., Albuquerque, NM (United States)

A robust injector capable of controlling the radius and angle of incidence of the intense, pulsed, annular electron beam extracted from the HERMES-III accelerator is described. The injector, called the compound lens, uses a tapered anode to control the beam electrostatically, followed by a gas cell with externally applied current to control the beam magnetically. Adjustment of the anode-cathode gap and external current of the injector permits the mean radius and injection angle of the beam to be defined independently of one another. Measurements of these quantities confirm model expectations. The extended planar-anode diode with a thin anode window has been used to inject a 25-ns, 19-MeV, 700-kA, annular electron beam into gas-filled drift cells for beam transport to bremsstrahlung targets located downstream of the HERMES-III accelerator. By adjusting the anode-cathode (AK) gap of the diode, the radius and angle of incidence of the annular beam at injection can be varied. Here the authors theoretically model and experimentally characterize the electron flow in the compound-lens diode when it is used as a bremsstrahlung source. Results are presented as the AK gap is increased to 40 cm. The model combines the MAGIC code to simulate the time-dependent electron flow in the AK gap and lens with the CYLTRAN code of the ITS system to model window effects and the subsequent transport in the target.

• Research Organization: Sandia National Labs., Albuquerque, NM (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 10157261
• Report Number(s): SAND--92-2221C; CONF-930511--3; ON: DE93013752
• Country of Publication: United States
• Language: English

Related Subjects

661220
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BEAM TRANSPORT
BREMSSTRAHLUNG
C CODES
ELECTRON BEAM INJECTION
ELECTRON BEAMS
ELECTRON COLLISIONS
FOCUSING
GAMMA RADIATION
GAMMA SOURCES
KILO AMP BEAM CURRENTS
M CODES
MEV RANGE 10-100
PARTICLE BEAM PRODUCTION AND HANDLING
TARGETS