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Title: Operating Undulator-based Femtoslicing at BESSY

Abstract

A source of 100 fs x-ray pulses with tunable polarization and excellent signal-to-background ratio has been constructed in 2004 at BESSY, based on laser-induced energy modulation ('femtoslicing') and subsequent angular separation of the short-pulse x-rays from an elliptical undulator. After commissioning at the BESSY II storage ring and characterizing the source, short-pulse radiation is now routinely delivered for pump-probe applications. The paper summarizes the results from commissioning and operational experience as well as possible upgrade options.

Authors:
; ;  [1];  [2];  [3]
  1. Berliner Elektronenspeicherring fuer Synchrotronstrahlung m.b.H. (BESSY), Albert-Einstein-Str. 15, 12489 Berlin (Germany)
  2. Institut fuer Experimentalphysik, Universitaet Hamburg, Luruper Chaussee 149, 22761 Hamburg (Germany)
  3. Physikalisches Institut der Universitaet Muenster, Wilhelm-Klemm-Str. 1, Muenster (Germany)
Publication Date:
OSTI Identifier:
21043420
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 879; Journal Issue: 1; Conference: 9. international conference on synchrotron radiation instrumentation, Daegu (Korea, Republic of), 28 May - 2 Jun 2006; Other Information: DOI: 10.1063/1.2435996; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; BESSY STORAGE RING; COMMISSIONING; LASER RADIATION; MODULATION; OPTICS; POLARIZATION; PROBES; PULSES; WIGGLER MAGNETS; X RADIATION

Citation Formats

Holldack, K., Kachel, T., Quast, T., Khan, S., and Mitzner, R. Operating Undulator-based Femtoslicing at BESSY. United States: N. p., 2007. Web. doi:10.1063/1.2435996.
Holldack, K., Kachel, T., Quast, T., Khan, S., & Mitzner, R. Operating Undulator-based Femtoslicing at BESSY. United States. doi:10.1063/1.2435996.
Holldack, K., Kachel, T., Quast, T., Khan, S., and Mitzner, R. Fri . "Operating Undulator-based Femtoslicing at BESSY". United States. doi:10.1063/1.2435996.
@article{osti_21043420,
title = {Operating Undulator-based Femtoslicing at BESSY},
author = {Holldack, K. and Kachel, T. and Quast, T. and Khan, S. and Mitzner, R.},
abstractNote = {A source of 100 fs x-ray pulses with tunable polarization and excellent signal-to-background ratio has been constructed in 2004 at BESSY, based on laser-induced energy modulation ('femtoslicing') and subsequent angular separation of the short-pulse x-rays from an elliptical undulator. After commissioning at the BESSY II storage ring and characterizing the source, short-pulse radiation is now routinely delivered for pump-probe applications. The paper summarizes the results from commissioning and operational experience as well as possible upgrade options.},
doi = {10.1063/1.2435996},
journal = {AIP Conference Proceedings},
number = 1,
volume = 879,
place = {United States},
year = {Fri Jan 19 00:00:00 EST 2007},
month = {Fri Jan 19 00:00:00 EST 2007}
}
  • The first experimental results from a double undulator with crossed magnetic fields for producing circularly polarized synchrotron radiation in the vacuum ultraviolet-soft x-ray range are presented. The observed variation of the extent of circularly polarized radiation with photon energy is discussed. A strong dependence of the state and degree of polarization on the exact details of the tuning of the two undulators and the monochromator is observed. This probably accounts for the measured degree of polarization being smaller than theoretically expected.
  • In actual performance, the 35 pole wiggler/undulator (W/U) at BESSY has been shown to deliver 50 to 250 times more flux than a TGM with 10 mrad of dipole radiation under otherwise comparable conditions. The beamline, laid out for photon energies from 15 to 400 eV, has been calibrated and the resolution measured at several energies. Interactions of the W/U with the storage ring have been studied and, in part, corrected for: the working point does not change in either direction (/lt/10%) as the gap is varied and the electron beam position in the ring remains constant to within 10more » /mu/m and the angle of emission of the SR from the ring to within 5 /mu/rad for /ital K//le/2.7. The reduction of the lifetime of the electron beam in the ring and the change in the vertical size of the beam as a function of the gap are typical of the problems associated with the interaction of such a device on a high brightness ring. The beamline has been in normal user operation for over a year.« less
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