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Title: Project to renew the undulators at the photon factory

Abstract

At the 2.5-GeV Photon Factory (PF) storage ring, we recently constructed four new undulators known as U#02-2, U#13, SGU#15, and U#28 for BL02, BL13, BL15, and BL28, respectively. SGU#15 is an in-vacuum undulator with a period length of 17.6 mm. The other three undulators are elliptically polarizing undulators (EPUs) for the vacuum ultraviolet and soft X-ray (VUV-SX) light sources to obtain various polarization states. We constructed these new undulators by fiscal 2013 and step by step installed them in the PF ring. We describe the details of the construction of these new undulators in this report.

Authors:
; ; ; ; ; ;  [1];  [2]
  1. Accelerator Laboratory, High Energy Accelerator Research Organization (Japan)
  2. Central Research Laboratory, Hitachi, ltd. (Japan)
Publication Date:
OSTI Identifier:
22608317
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1741; Journal Issue: 1; Conference: SRI2015: 12. international conference on synchrotron radiation instrumentation, New York, NY (United States), 6-10 Jul 2015; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; FAR ULTRAVIOLET RADIATION; GEV RANGE 01-10; PHOTONS; POLARIZATION; SOFT X RADIATION; STORAGE RINGS; WIGGLER MAGNETS; X-RAY SOURCES

Citation Formats

Tsuchiya, Kimichika, E-mail: kimichika.tsuchiya@kek.jp, Adachi, Masahiro, Shioya, Tatsuro, Honda, Tohru, Tanimoto, Yasunori, Nogami, Takashi, Asaoka, Seiji, and Ueda, Kazuhiro. Project to renew the undulators at the photon factory. United States: N. p., 2016. Web. doi:10.1063/1.4952802.
Tsuchiya, Kimichika, E-mail: kimichika.tsuchiya@kek.jp, Adachi, Masahiro, Shioya, Tatsuro, Honda, Tohru, Tanimoto, Yasunori, Nogami, Takashi, Asaoka, Seiji, & Ueda, Kazuhiro. Project to renew the undulators at the photon factory. United States. doi:10.1063/1.4952802.
Tsuchiya, Kimichika, E-mail: kimichika.tsuchiya@kek.jp, Adachi, Masahiro, Shioya, Tatsuro, Honda, Tohru, Tanimoto, Yasunori, Nogami, Takashi, Asaoka, Seiji, and Ueda, Kazuhiro. 2016. "Project to renew the undulators at the photon factory". United States. doi:10.1063/1.4952802.
@article{osti_22608317,
title = {Project to renew the undulators at the photon factory},
author = {Tsuchiya, Kimichika, E-mail: kimichika.tsuchiya@kek.jp and Adachi, Masahiro and Shioya, Tatsuro and Honda, Tohru and Tanimoto, Yasunori and Nogami, Takashi and Asaoka, Seiji and Ueda, Kazuhiro},
abstractNote = {At the 2.5-GeV Photon Factory (PF) storage ring, we recently constructed four new undulators known as U#02-2, U#13, SGU#15, and U#28 for BL02, BL13, BL15, and BL28, respectively. SGU#15 is an in-vacuum undulator with a period length of 17.6 mm. The other three undulators are elliptically polarizing undulators (EPUs) for the vacuum ultraviolet and soft X-ray (VUV-SX) light sources to obtain various polarization states. We constructed these new undulators by fiscal 2013 and step by step installed them in the PF ring. We describe the details of the construction of these new undulators in this report.},
doi = {10.1063/1.4952802},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1741,
place = {United States},
year = 2016,
month = 7
}
  • Very short-period and in-vacuum type undulators have been developed and installed in the 2.5-GeV Photon Factory storage ring, which was upgraded to enhance the straight sections for insertion devices in 2005. X rays ranging from 2 keV to 15 keV are covered by these undurators with their lower harmonics.
  • A new project for upgrading the 2.5-GeV Photon Factory (PF) storage ring is now being undertaken to create six new short-straight sections and to lengthen the existing eight straight sections. The short-straight sections will provide an opportunity to install short-period narrow-gap undulators, while the extensions of existing straight sections will be taken advantage of updating current insertion devices to the latest models in future. To this end, the lattice configuration around the straight sections is modified by replacing old quadrupole magnets with new shorter ones and placing them closer to the near-by bending magnets. Necessary replacement of the vacuum ductsmore » and the beamline front ends will be carried out together. This project will be completed by the end of September, 2005, after six months of shutdown.« less
  • For the upgrade project of the straight sections at the Photon Factory storage ring (PF ring), a reconstruction was carried out during the period from the 28th February to 20th September 2005. In this period, the installation of new quadrupole magnets and the precise alignment of the magnets together with the existing magnets were conducted using a laser tracker system and a leveling scope. As a result, the magnets were aligned with a tolerance of 100{mu}m RMS for both of horizontal and vertical direction, and 200{mu}m RMS for longitudinal direction. The precise alignment enabled us to realize the small closedmore » orbit distortions (CODs) less than {+-}5mm without any corrections at the first stage of the beam commissioning.« less
  • Several years ago, an article in SRN [1] with the same title as this article summarized the decade-long development of superconducting undulators (SCUs) at the Advanced Photon Source (APS). The article presented those developments leading to the point when the first prototype, called SCU0 and intended for installation at the APS, was under fabrication. SCU0 was built in 2012, its cryogenic performance has been extensively tested, and detailed magnet measurements of the device have been conducted. After verification that SCU0 met all of the technical requirements for APS insertion devices, it was installed in the APS storage ring in Januarymore » 2013, commissioned in a record short time (two weeks), and became a routinely used source of hard X-rays at the APS Sector 6 ID beamline.« less
  • The effect of nonzero particle beam emittance and magnetic field errors on the on-axis spectral brightness (/ital BT//sub 0/) of long undulators is discussed. It is shown that the quadratic dependence of /ital BT//sub 0/ on the number of undulator periods, /ital N/, is reduced by emittance to /ital N//sup /ital x// with 1/le//ital x//lt/2. Further reductions in the intensity result from random magnetic field errors present in the undulator. An approximate model for the intensity of the central core of radiation of the principle harmonics is discussed and the results compared to those from Monte Carlo-type calculations where emittancemore » is explicitly accounted for. An estimation of the effects of random field errors on the on-axis brightness in the presence of nonzero particle emittance is made. For the particular case of undulators proposed for the 7-GeV Advanced Photon Source, the results indicate that 5-m-long devices segmented into two sections will provide the required spectral intensity of a single long undulator when both emittance and magnet errors are considered.« less