Experimental observation of high-brightness microbunching in a photocathode rf electron gun
- National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973 (United States)
We report the measurement of very short, high-brightness bunches of electrons produced in a photocathode rf gun with no magnetic compression. The electron beam bunch length and the charge distribution along the bunch were measured by passing the energy chirped the electron beam through a momentum selection slit while varying the phase of the rf linac. The bunch compression as a function of rf gun phase and electric field at the cathode were investigated. The shortest measured bunch is 370{plus_minus}100 fs (at 95{percent} of the charge) with 2.5{times}10{sup 8} electrons (170 A peak current); the normalized rms emittance of this beam was measured to be 0.5{pi} mmmrad and the energy spread is 0.15{percent}. {copyright} {ital 1996 The American Physical Society.}
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 392012
- Journal Information:
- Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics, Vol. 54, Issue 4; Other Information: PBD: Oct 1996
- Country of Publication:
- United States
- Language:
- English
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