Rf and space-charge induced emittances in laser-driven rf guns

Conference · Sat Oct 01 00:00:00 EDT 1988

OSTI ID:6612441

Kim, Kwang-Je; Chen, Yu-Jiuan

Laser-driven rf electron guns are potential sources of high-current, low-emittance, short bunch-length electron beams, which are required for many advanced accelerator applications, such as free-electron lasers and injectors for high-energy machines. In such guns the design of which was pioneered at Los Alamos National Laboratory and which is currently being developed at several other laboratories, a high-power laser beam illuminates a photo-cathode surface placed on an end wall of an rf cavity. The main advantages of this type of gun are that the time structure of the electron beam is controlled by the laser, eliminating the need for bunchers, and that the electric field in rf cavities can be made very strong, so that the effects due to space-charge repulsion can be minimized. In this paper, we present an approximate but simple analysis for the transverse and longitudinal emittances in rf guns that takes into account both the time variation of the rf field and the space-charge effect. The results are compared and found to agree well with those from simulation. 7 refs., 6 figs.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6612441
• Report Number(s): LBL-26050; CONF-881049-48; ON: DE89004693
• Resource Relation: Conference: Linear accelerator conference, Williamsburg, VA, USA, 3 Oct 1988; Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ELECTRON GUNS
BEAM EMITTANCE
COMPUTERIZED SIMULATION
ELECTRIC FIELDS
ELECTRON BEAMS
LASERS
PHASE SPACE
RF SYSTEMS
SPACE CHARGE
TRANSVERSE MOMENTUM
BEAMS
LEPTON BEAMS
LINEAR MOMENTUM
MATHEMATICAL SPACE
PARTICLE BEAMS
SIMULATION
SPACE
430200* - Particle Accelerators- Beam Dynamics
Field Calculations
& Ion Optics
430302 - Particle Accelerators- Injection & Extraction Systems