Production, transport and injection of a cold non-magnetized electron beam for the recirculating linac
A new foilless diode with a non-magnetically immersed cathode was recently designed and built for the Sandia Recirculating Linear Accelerator (RLA). Because there is also no radial component of electric field at the cathode, the electron beam starts almost parallel and is matched to a solenoidal transport system with minimum increase in divergence and radius. The electrode emission surface is specified by an area covered with felt which undergoes explosive electron emission at low electrical field stresses (60 kV/cm). The 1.7-MV, 4.8-kA produced beam is transported 1.5 meters to the injection region of the racetrack via a system of solenoids and focusing coils. The maximum transverse velocity component at injection point (1.5 m downstream from the cathode surface) is BETA/sub /perpendicular// = 0.03 and the radius r = 2.8 cm which give a quite small beam emittance /var epsilon/ = 0.08 rad-cm. Three-dimensional numerical simulations suggest that tangential injection into the ion focusing regime (IFR) channel of the accelerator provides better beam-channel coupling. A 1.3-MV and 4-MV design are also described. 6 refs., 13 figs.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6807904
- Report Number(s):
- SAND-88-1985C; CONF-881049-19; ON: DE89001234
- Country of Publication:
- United States
- Language:
- English
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Low emittance immersed and non-immersed foilless diodes for high current electron linacs
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Related Subjects
430200* -- Particle Accelerators-- Beam Dynamics
Field Calculations
& Ion Optics
430302 -- Particle Accelerators-- Injection & Extraction Systems
ACCELERATORS
BEAM EMITTANCE
BEAM INJECTION
BEAM TRANSPORT
BEAMS
ELECTRON BEAMS
LEPTON BEAMS
LINEAR ACCELERATORS
MAGNETIC FIELDS
PARTICLE BEAMS
TRAJECTORIES