Design of an x-ray free electron laser undulator
- Stanford Synchrotron Radiation Laboratory, Stanford Linear Accelerator Center, Stanford, California94309 (United States)
An undulator designed to be used for an x-ray free electron laser has to meet a set of stringent requirements. With no optical cavity, an x-ray FEL operates in the single pass Self Amplified Spontaneous Emission (SASE) mode; an electron macropulse is microbunched by an undulator and the radiation it creates. The microbunched pulse emits spontaneous radiation and coherent FEL radiation, whose power may reach saturation in a sufficiently long and perfect undulator. The pulse must have low emittance and high current, and its trajectory in the undulator must keep the radiation and the pulse together with a very high degree of overlap. We shall consider the case of the Linear Coherent Light Source (LCLS) FEL project at SLAC, which is intended to create 1.5 {Angstrom} x-rays using an electron beam with 15 GeV energy, 1.5{pi} mm-mrad normalized emittance, 3400 A peak current, and 280 fsec FWHM bunch duration. We find that this 65 {mu}m rms diameter beam must overlap its radiation with a walkoff of no more than 5 {mu}m for efficient gain. This places severe limitations on the magnetic field errors and other mechanical tolerances. The following is a discussion of the undulator design, specifications, alignment, engineering, and beam position monitoring we plan to implement for the LCLS X-ray FEL. {copyright} {ital 1997 American Institute of Physics.}
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 659277
- Report Number(s):
- CONF-9706157-; ISSN 0094-243X; TRN: 98:010585
- Journal Information:
- AIP Conference Proceedings, Vol. 417, Issue 1; Conference: SRI `97: 10. U.S. national conference on synchrotron radiation instrumentation, Ithaca, NY (United States), 17-20 Jun 1997; Other Information: PBD: Jul 1997
- Country of Publication:
- United States
- Language:
- English
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