A high current, short pulse electron source for wakefield accelerators

Technical Report · Wed Jan 01 04:00:00 EST 1992

DOI:https://doi.org/10.2172/7121494· OSTI ID:7121494

Ho, Ching-Hung

Design studies for the generation of a high current, short pulse electron source for the Argonne Wakefield Accelerator are presented. An L-band laser photocathode rf gun cavity is designed using the computer code URMEL to maximize the electric field on the cathode surface for fixed frequency and rf input power. A new technique using a curved incoming laser wavefront to minimize the space charge effect near the photocathode is studied. A preaccelerator with large iris to minimize wakefield effects is used to boost the drive beam to a useful energy of around 20 MeV for wakefield acceleration experiments. Focusing in the photocathode gun and the preaccelerator is accomplished with solenoids. Beam dynamics simulations throughout the preaccelerator are performed using particle simulation codes TBCI-SF and PARMELA. An example providing a useful set of operation parameters for the Argonne Wakefield Accelerator is given. The effects of the sagitta of the curved beam and laser amplitude and timing jitter effects are discussed. Measurement results of low rf power level bench tests and a high power test for the gun cavity are presented and discussed.

• Research Organization: Argonne National Lab., IL (United States). High Energy Physics Div.
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 7121494
• Report Number(s): ANL-HEP-TR-92-74; ON: DE93005550
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430301* -- Particle Accelerators-- Ion Sources
ACCELERATORS
BEAM CURRENTS
BEAM DYNAMICS
CATHODES
COMPUTERIZED SIMULATION
CURRENTS
DESIGN
ELECTRODES
ELECTRON SOURCES
LINEAR ACCELERATORS
PARTICLE SOURCES
PHOTOCATHODES
RADIATION SOURCES
RF SYSTEMS
SIMULATION
TUNING
WAKEFIELD ACCELERATORS