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Title: Performance of Small-Gap Undulators at the SLS Intermediate Energy Storage Ring

Abstract

The Swiss Light Source (SLS) at the Paul Scherrer Institut (PSI) became the first medium energy synchrotron user facility to rely on the high harmonic operation of small gap, short period undulators to extend high brightness radiation into a regime (3-18 keV) otherwise only accessible using lower brightness wigglers or operation at higher electron beam energy. Today several facilities with beam energy 2-3 GeV follow a similar route. A PSI/SPring-8 collaboration was formed to install and operate the first in-vacuum undulator shortly after commissioning of the SLS storage ring (2.4 GeV) in 2001. The goal of the joint project was to prove that high harmonic operation of small period undulators at small gaps is a valid concept to operate the PX-I beamline at 1 Aa under user operation conditions. The performance of the PX-I beamline proved to be excellent and launched the installation of meanwhile 4 new in-vacuum undulators. Having routinely operated such devices for 5 years, our experience confirms that (1) the concept of operating short period undulators (19-24 mm) on higher harmonics (11./13.) is valid, (2) reliable small gap (5-6 mm) undulator operation is feasible in the presence of top-up injection, and (3) during gap scans the photonmore » beam can be stabilized to sub-{mu}rad precision using non-intercepting photon beam monitors.« less

Authors:
; ; ; ; ; ; ; ;  [1]; ; ;  [2]
  1. Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen (Switzerland)
  2. RIKEN/SPring-8, 1-1-1 Koutu, Mikazuki-cho, Sayo-gun, Hyogo 679-5148 (Japan)
Publication Date:
OSTI Identifier:
21052533
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: 10.1063/1.2436081; (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; ACCURACY; BEAM MONITORS; COMMISSIONING; ELECTRON BEAMS; GEV RANGE; KEV RANGE; OPERATION; PERFORMANCE; PHOTON BEAMS; SPRING-8 STORAGE RING; SWISS LIGHT SOURCE; SYNCHROTRON RADIATION; WIGGLER MAGNETS

Citation Formats

Ingold, G., Boege, M., Bulgheroni, W., Keller, A., Krempaski, J., Schulze-Briese, C., Schulz, L., Schmidt, T., Zimoch, D., Hara, T., Tanaka, T., and Kitamura, H. Performance of Small-Gap Undulators at the SLS Intermediate Energy Storage Ring. United States: N. p., 2007. Web. doi:10.1063/1.2436081.
Ingold, G., Boege, M., Bulgheroni, W., Keller, A., Krempaski, J., Schulze-Briese, C., Schulz, L., Schmidt, T., Zimoch, D., Hara, T., Tanaka, T., & Kitamura, H. Performance of Small-Gap Undulators at the SLS Intermediate Energy Storage Ring. United States. doi:10.1063/1.2436081.
Ingold, G., Boege, M., Bulgheroni, W., Keller, A., Krempaski, J., Schulze-Briese, C., Schulz, L., Schmidt, T., Zimoch, D., Hara, T., Tanaka, T., and Kitamura, H. Fri . "Performance of Small-Gap Undulators at the SLS Intermediate Energy Storage Ring". United States. doi:10.1063/1.2436081.
@article{osti_21052533,
title = {Performance of Small-Gap Undulators at the SLS Intermediate Energy Storage Ring},
author = {Ingold, G. and Boege, M. and Bulgheroni, W. and Keller, A. and Krempaski, J. and Schulze-Briese, C. and Schulz, L. and Schmidt, T. and Zimoch, D. and Hara, T. and Tanaka, T. and Kitamura, H.},
abstractNote = {The Swiss Light Source (SLS) at the Paul Scherrer Institut (PSI) became the first medium energy synchrotron user facility to rely on the high harmonic operation of small gap, short period undulators to extend high brightness radiation into a regime (3-18 keV) otherwise only accessible using lower brightness wigglers or operation at higher electron beam energy. Today several facilities with beam energy 2-3 GeV follow a similar route. A PSI/SPring-8 collaboration was formed to install and operate the first in-vacuum undulator shortly after commissioning of the SLS storage ring (2.4 GeV) in 2001. The goal of the joint project was to prove that high harmonic operation of small period undulators at small gaps is a valid concept to operate the PX-I beamline at 1 Aa under user operation conditions. The performance of the PX-I beamline proved to be excellent and launched the installation of meanwhile 4 new in-vacuum undulators. Having routinely operated such devices for 5 years, our experience confirms that (1) the concept of operating short period undulators (19-24 mm) on higher harmonics (11./13.) is valid, (2) reliable small gap (5-6 mm) undulator operation is feasible in the presence of top-up injection, and (3) during gap scans the photon beam can be stabilized to sub-{mu}rad precision using non-intercepting photon beam monitors.},
doi = {10.1063/1.2436081},
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}
}
  • No abstract prepared.
  • The goal of monitoring the vertical position of the SLS machine was achieved by employing a capacitive gauge-based Hydrostatic Leveling System (HLS). Although all the preliminary results showed that the aimed HLS micrometric range resolutions and accuracies have been reached, the long-time behavior of the system revealed considerable drifts. A satisfactory solution could eventually be reached only by adding to the working fluid a fungicide.
  • Small-gap undulators offer enhanced performance as synchrotron radiation sources, by providing extended tuning range and the possibility of higher photon energies via short-period, small-gap devices. Challenges associated with the operation of small-gap undulators arise from their requirement for small beam apertures and the resulting possibility of lifetime degradation, beam instabilities, and radiation hazards. To investigate these fundamental limitations, we have constructed an R&D small-gap undulator for the X13 straight section of the NSLS 2.584 GeV X-ray Ring and have tested it during studies shifts and normal user shifts during the last year. This device, the NSLS prototype small-gap undulator (PSGU),more » consists of a variable-aperture vacuum chamber and a 16-mm-period pure-permanent-magnet undulator, both mounted to a common elevator base stage. The design output spectrum of 2.5 keV in the fundamental (and 7.5 keV in the third harmonic) was obtained with a magnet gap of 5.6 mm and an electron beam aperture of 2.5 mm. The partial lifetime contribution for these parameters was observed to be about 40 hr. Details of the synchrotron radiation output spectrum, lifetime dependence on aperture, and bremsstrahlung radiation production will be presented. {copyright} {ital 1996 American Institute of Physics.}« less
  • In-vacuum undulators have been installed in the UVSOR-BL3U and BL7U. Due to the improvement of the UVSOR, the insertion devices with narrow magnetic gaps such as the in-vacuum undulators have become available. The undulators have the period length of 36/38mm and the minimum gap of 15mm, which results in wide tunability in VUV and soft X-ray region. Influence on the stored beam, especially for the resistive wall instability, has been estimated and it has found that the disturbance for the stored beam can be negligible even in the minimum gap height.
  • A unique capability to vary the length of magnetic period in an undulator can be achieved with a geometry based on staggered arrays of permeable poles placed in a magnetic solenoid. The new classes of solenoid-derived undulators, which do not use permanent magnets, have the potential to provide wide tunability of the first and third energy harmonics by varying the length of the magnetic period and solenoid field, and deliver only small powers at undesired harmonics. The magnetic and spectral properties of such 'variable-period undulator' operating on the proposed PETRA III storage ring are presented to demonstrate the superior performancemore » of such a device in comparison to conventional permanent-magnet hybrid undulators. They have the potential to be useful as synchrotron radiation sources at both currently operating and future low-emittance storage rings, energy-recovery linacs (ERLs), and free-electron lasers (FELs)« less