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Way to increase the user access at the LCLS baseline

Abstract

Although the LCLS photon beam is meant for a single user, the baseline undulator is long enough to serve two users simultaneously. To this end, we propose a setup composed of two simple elements: an X-ray mirror pair for X-ray beam deflection, and a short (4 m-long) magnetic chicane, which creates an offset for mirror pair installation in the middle of the baseline undulator. The insertable mirror pair can be used for spatial separation of the X-ray beams generated in the first and in the second half of the baseline undulator. The method of deactivating one half and activating another half of the undulator is based on the rapid switching of the FEL amplification process. As proposed elsewhere, using a kicker installed upstream of the LCLS baseline undulator and an already existing corrector in the first half of the undulator, it is possible to rapidly switch the X-ray beam from one user to another, thus providing two active beamlines at any time. We present simulation results dealing with the LCLS baseline, and show that it is possible to generate two saturated SASE X-ray beams in the whole 0.8-8 keV photon energy range in the same baseline undulator. These can be  More>>
Authors:
Geloni, Gianluca; [1]  Kocharyan, Vitali; Saldin, Evgeni [2] 
  1. European XFEL GmbH, Hamburg
  2. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
Publication Date:
Oct 15, 2010
Product Type:
Technical Report
Report Number:
DESY-10-165
Subject:
43 PARTICLE ACCELERATORS; BEAM TRANSPORT; BRAGG REFLECTION; ELECTROMAGNETIC PULSES; ELECTRON BEAMS; EV RANGE 100-1000; FREE ELECTRON LASERS; HARD X RADIATION; HARMONIC GENERATION; KEV RANGE 01-10; KICKER MAGNETS; LASER RADIATION; MIRRORS; MONOCHROMATIC RADIATION; ONDULATOR RADIATION; PHOTON BEAMS; PIEZOELECTRICITY; REFLECTIVITY; SIMULATION; SOFT X RADIATION; WIGGLER MAGNETS; X-RAY EQUIPMENT; X-RAY SPECTRA
OSTI ID:
21380882
Research Organizations:
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
Country of Origin:
Germany
Language:
English
Other Identifying Numbers:
Other: ISSN 0418-9833; TRN: DE10FE247
Availability:
Commercial reproduction prohibited; INIS; OSTI as DE21380882
Submitting Site:
DEN
Size:
34 pages
Announcement Date:
Dec 22, 2010

Citation Formats

Geloni, Gianluca, Kocharyan, Vitali, and Saldin, Evgeni. Way to increase the user access at the LCLS baseline. Germany: N. p., 2010. Web.
Geloni, Gianluca, Kocharyan, Vitali, & Saldin, Evgeni. Way to increase the user access at the LCLS baseline. Germany.
Geloni, Gianluca, Kocharyan, Vitali, and Saldin, Evgeni. 2010. "Way to increase the user access at the LCLS baseline." Germany.
@misc{etde_21380882,
title = {Way to increase the user access at the LCLS baseline}
author = {Geloni, Gianluca, Kocharyan, Vitali, and Saldin, Evgeni}
abstractNote = {Although the LCLS photon beam is meant for a single user, the baseline undulator is long enough to serve two users simultaneously. To this end, we propose a setup composed of two simple elements: an X-ray mirror pair for X-ray beam deflection, and a short (4 m-long) magnetic chicane, which creates an offset for mirror pair installation in the middle of the baseline undulator. The insertable mirror pair can be used for spatial separation of the X-ray beams generated in the first and in the second half of the baseline undulator. The method of deactivating one half and activating another half of the undulator is based on the rapid switching of the FEL amplification process. As proposed elsewhere, using a kicker installed upstream of the LCLS baseline undulator and an already existing corrector in the first half of the undulator, it is possible to rapidly switch the X-ray beam from one user to another, thus providing two active beamlines at any time. We present simulation results dealing with the LCLS baseline, and show that it is possible to generate two saturated SASE X-ray beams in the whole 0.8-8 keV photon energy range in the same baseline undulator. These can be exploited to serve two users. Implementation of the proposed technique does not perturb the baseline mode of operation of the LCLS undulator. Moreover, the magnetic chicane setup is very flexible, and can be used as a self-seeding setup too. We present simulation results for the LCLS baseline undulator with SHAB (second harmonic afterburner) and show that one can produce monochromatic radiation at the 2nd harmonic as well as at the 1st. We describe an efficient way for obtaining multi-user operation at the LCLS hard X-ray FEL. To this end, a photon beam distribution system based on the use of crystals in the Bragg reflection geometry is proposed. The reflectivity of crystal deflectors can be switched fast enough by flipping the crystals with piezoelectric devices similar to those for X-ray phase retarders at synchrotron radiation facilities. It is then possible to distribute monochromatic hard X-rays among 6 independent experiments, thereby enabling 6 users to work in parallel in the near and far experimental halls. (orig.)}
place = {Germany}
year = {2010}
month = {Oct}
}