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Title: Design of an x-ray free electron laser undulator

Abstract

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 {angstrom} x-rays using an electron beam with 15 GeV energy, 1.5{pi} 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,more » and beam position monitoring they plan to implement for the LCLS X-ray FEL.« less

Authors:
Publication Date:
Research Org.:
Stanford Univ., Stanford Linear Accelerator Center, CA (US)
Sponsoring Org.:
USDOE Office of Energy Research, Washington, DC (US)
OSTI Identifier:
663315
Report Number(s):
SLAC-PUB-7651; CONF-9706157-
Journal ID: ISSN 0094-243X; ON: DE98059141; TRN: US200305%%912
DOE Contract Number:  
AC03-76SF00515
Resource Type:
Conference
Resource Relation:
Conference: SRI '97: 10. U.S. national conference on synchrotron radiation instrumentation, Ithaca, NY (US), 06/17/1997--06/20/1997; Other Information: Supercedes report DE98059141; PBD: Sep 1997; PBD: 1 Sep 1997
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 42 ENGINEERING; ALIGNMENT; BEAM POSITION; ELECTRON BEAMS; ELECTRONS; FREE ELECTRON LASERS; LIGHT SOURCES; MAGNETIC FIELDS; MONITORING; RADIATIONS; SATURATION; SPECIFICATIONS; STANFORD LINEAR ACCELERATOR CENTER; SYNCHROTRON RADIATION; WIGGLER MAGNETS

Citation Formats

Carr, R. Design of an x-ray free electron laser undulator. United States: N. p., 1997. Web. doi:10.1063/1.54589.
Carr, R. Design of an x-ray free electron laser undulator. United States. https://doi.org/10.1063/1.54589
Carr, R. Mon . "Design of an x-ray free electron laser undulator". United States. https://doi.org/10.1063/1.54589. https://www.osti.gov/servlets/purl/663315.
@article{osti_663315,
title = {Design of an x-ray free electron laser undulator},
author = {Carr, R},
abstractNote = {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 {angstrom} x-rays using an electron beam with 15 GeV energy, 1.5{pi} 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.},
doi = {10.1063/1.54589},
url = {https://www.osti.gov/biblio/663315}, journal = {},
issn = {0094-243X},
number = ,
volume = ,
place = {United States},
year = {1997},
month = {9}
}

Conference:
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