Design of an x-ray free electron laser undulator [electronic resource].
- Published:
- Washington, D.C. : United States. Dept. of Energy. Office of Energy Research, 1997.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy. - Physical Description:
- 7 pages : digital, PDF file
- Additional Creators:
- Stanford Linear Accelerator Center
United States. Department of Energy. Office of Energy Research
United States. Department of Energy. Office of Scientific and Technical Information - Access Online:
- www.osti.gov
- Summary:
- 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. The authors shall consider the case of the Linear Coherent Light Source (LCLS) FEL project at SLAC, which is intended to create 1.5 Å x-rays using an electron beam with 15 GeV energy, 1.5π mm-mrad normalized emittance, 3,400 A peak current, and 280 fsec FWHM bunch duration. They find that this 65 {micro}m rms diameter beam must overlap its radiation with a walk/off of no more than 5 {micro}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 they plan to implement for the LCLS X-ray FEL.
- Subject(s):
- Note:
- Published through SciTech Connect.
09/01/1997.
"slac-pub--7651"
" conf-9706157--"
"DE98059141"
SRI '97: 10. U.S. national conference on synchrotron radiation instrumentation, Ithaca, NY (US), 06/17/1997--06/20/1997.
Carr, R. - Funding Information:
- AC03-76SF00515
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