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Title: Status of the 6.5-GeV Photon Factory Advanced Ring

Abstract

The Photon Factory Advanced Ring (PF-AR) is a 6.5-GeV synchrotron light source at the High Energy Accelerator Research Organization (KEK). It can provide high-flux hard X-rays for such research as the materials science, structural biology and medical applications. The PF-AR has five insertion devices including four in-vacuum undulators. It is operated with a single bunch which fits for time-resolved experiments. A special 5-GeV operation is partly provided for a clinical application. An initial beam current and a beam lifetime are 60 mA and approximately 14 hours, respectively. Recent developments include an installation of a new in-vacuum undulator (U no. NW14-36) to the west rf section, which was accompanied by transferring two rf cavities to other section. The undulator has been successfully operated at a minimum magnetic gap of 10 mm. We also carried out such accelerator studies as a successful test of beam injection using a pulsed quadrupole magnet, a study of low emittance optics, an establishment of two-bunch operation for the clinical application, a successful operation of a multi-bunch feedback system, and an installation of a test undulator which enables us to control polarization using a new arrangement of magnets.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1]
  1. KEK, High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba, Ibaraki 305-0801 (Japan) (and others)
Publication Date:
OSTI Identifier:
21052671
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: 10.1063/1.2436013; (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; BEAM CURRENTS; BEAM INJECTION; BEAM OPTICS; BEAM PRODUCTION; CAVITY RESONATORS; GEV RANGE; HARD X RADIATION; JAPANESE ORGANIZATIONS; LIGHT SOURCES; OPERATION; PHOTON BEAMS; POLARIZATION; QUADRUPOLES; RF SYSTEMS; SYNCHROTRON RADIATION; TIME RESOLUTION; WIGGLER MAGNETS

Citation Formats

Miyajima, T., Adachi, S., Cheng, W. X., Haga, K., Harada, K., Hori, Y., Hyodo, K., Ieiri, T., Isagawa, S., Kageyama, T., Kasuga, T., Kawata, H., Kikuchi, M., Kobayashi, Y., Kudo, K., Mitsuhashi, T., Nagahashi, S., Nakamura, T. T., Nakanishi, H., and Nogami, T. Status of the 6.5-GeV Photon Factory Advanced Ring. United States: N. p., 2007. Web. doi:10.1063/1.2436013.
Miyajima, T., Adachi, S., Cheng, W. X., Haga, K., Harada, K., Hori, Y., Hyodo, K., Ieiri, T., Isagawa, S., Kageyama, T., Kasuga, T., Kawata, H., Kikuchi, M., Kobayashi, Y., Kudo, K., Mitsuhashi, T., Nagahashi, S., Nakamura, T. T., Nakanishi, H., & Nogami, T. Status of the 6.5-GeV Photon Factory Advanced Ring. United States. doi:10.1063/1.2436013.
Miyajima, T., Adachi, S., Cheng, W. X., Haga, K., Harada, K., Hori, Y., Hyodo, K., Ieiri, T., Isagawa, S., Kageyama, T., Kasuga, T., Kawata, H., Kikuchi, M., Kobayashi, Y., Kudo, K., Mitsuhashi, T., Nagahashi, S., Nakamura, T. T., Nakanishi, H., and Nogami, T. Fri . "Status of the 6.5-GeV Photon Factory Advanced Ring". United States. doi:10.1063/1.2436013.
@article{osti_21052671,
title = {Status of the 6.5-GeV Photon Factory Advanced Ring},
author = {Miyajima, T. and Adachi, S. and Cheng, W. X. and Haga, K. and Harada, K. and Hori, Y. and Hyodo, K. and Ieiri, T. and Isagawa, S. and Kageyama, T. and Kasuga, T. and Kawata, H. and Kikuchi, M. and Kobayashi, Y. and Kudo, K. and Mitsuhashi, T. and Nagahashi, S. and Nakamura, T. T. and Nakanishi, H. and Nogami, T.},
abstractNote = {The Photon Factory Advanced Ring (PF-AR) is a 6.5-GeV synchrotron light source at the High Energy Accelerator Research Organization (KEK). It can provide high-flux hard X-rays for such research as the materials science, structural biology and medical applications. The PF-AR has five insertion devices including four in-vacuum undulators. It is operated with a single bunch which fits for time-resolved experiments. A special 5-GeV operation is partly provided for a clinical application. An initial beam current and a beam lifetime are 60 mA and approximately 14 hours, respectively. Recent developments include an installation of a new in-vacuum undulator (U no. NW14-36) to the west rf section, which was accompanied by transferring two rf cavities to other section. The undulator has been successfully operated at a minimum magnetic gap of 10 mm. We also carried out such accelerator studies as a successful test of beam injection using a pulsed quadrupole magnet, a study of low emittance optics, an establishment of two-bunch operation for the clinical application, a successful operation of a multi-bunch feedback system, and an installation of a test undulator which enables us to control polarization using a new arrangement of magnets.},
doi = {10.1063/1.2436013},
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 straight-section upgrade project of the Photon Factory created four new short straight sections capable of housing in-vacuum minipole undulators. The first minipole undulator was installed at the 2.5-GeV Photon Factory storage ring in the summer of 2005. The beamline front-end including the graphite filter and Be windows system is described in this paper.
  • Progress in performance of a beamline for a 60-period soft x-ray undulator of the 2.5-GeV Photon Factory storage ring was made by implementation of low emittance operation of the storage ring and improvements of beamline and monochromator units. Monochromated photon flux of up to 10/sup 12/ photons/s has now been achieved at maximum in ordinary operating conditions of the ring current of /approx/200 mA with resolution of 500--1000 over the soft x-ray region from 410 eV to a few keV of photon energy.
  • The high brightness of synchrotron radiation produced by storage rings has enhanced research capability by factors of 10/sup 6/ to 10/sup 8/, from the ultraviolet to the x-ray region. There has been a steady growth in synchrotron radiation research of interest in physics, chemistry, biology, geology, and the other physical sciences and their associated technologies. A large number of university, government, and industrial research organizations are utilizing this new capability at existing facilities. In the process, new partnerships have been created among these communities that have enabled each to contribute its expertise and to obtain its needed capability. A 6-giga-electronmore » volt storage ring, designed for use with periodic magnetic insertion devices called wigglers and undulators, has been proposed; such a facility could provide further enhancements of 10/sup 4/ to 10/sup 6/ in capability and could double the synchrotron radiation research capacity in the US. This enhanced capability and capacity will provide new opportunities for a broad range of scientific and technological interests. 40 references, 4 figures.« less
  • The Light Source Building of the Photon Factory was found to distort so much as to induce the displacement of magnets in the storage ring. This resulted in drifting of the beam orbit. It was considered that the building was distorted by the variations of thermal stress, such as diurnal changes of the solar irradiation and atmospheric temperature. To reduce such thermal stress, the rooftop of the building was insulated with a layer of polyethylene foam. The building distortion was measured in terms of vertical floor displacements along the storage ring by using a hydrostatic level measuring system. Results ofmore » the measurement were compared with those of a model simulation based on the finite element method. Comparison between measured and simulated results showed good agreement before the insulation applied to the roof. After the insulation, the measured floor displacements reduced to about one half and were also comparable to the simulated results. A full description of the subject is given in T. Katsura, Ed., KEK Internal {bold 90}-{bold 32} (in Japanese) Jan. (1991).« less
  • The vertical acceptance of the Photon Factory storage ring had been limited by a narrow vacuum chamber at an insertion device. To increase the acceptance, the vertical betatron function at the device was reduced. This modification resulted in an increase of the beam lifetime by a factor of 1.5 and enabled one to operate the ring continuously for 24 h without a beam injection. The effects of the optics modification on the beam lifetime, beam injection, betatron tune shifts produced by the insertion devices, and the brilliance of the synchrotron light are presented.