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Title: Present Status of NewSUBARU Storage Ring

Abstract

Some topics of the operational characteristics and improvements in these two years, in particular, vacuum and orbit, are summarized. The top-up operation realizes the constant flux of synchrotron radiation light at 1 GeV, then many experiments or users become to need the stability of light in less than 1 % range. The orbit stability of the electron beam is the key for this.

Authors:
; ;  [1]
  1. NewSUBARU/SPring-8, Laboratory for Advanced Science and Technology for Industry, University of Hyogo, 678-1205 (Japan)
Publication Date:
OSTI Identifier:
21049341
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: 10.1063/1.2436033; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BEAM PRODUCTION; ELECTRON BEAMS; GEV RANGE; OPERATION; ORBIT STABILITY; ORBITS; STORAGE RINGS; SYNCHROTRON RADIATION

Citation Formats

Ando, Ainosuke, Hashimoto, Satoshi, and Shoji, Yoshihiko. Present Status of NewSUBARU Storage Ring. United States: N. p., 2007. Web. doi:10.1063/1.2436033.
Ando, Ainosuke, Hashimoto, Satoshi, & Shoji, Yoshihiko. Present Status of NewSUBARU Storage Ring. United States. doi:10.1063/1.2436033.
Ando, Ainosuke, Hashimoto, Satoshi, and Shoji, Yoshihiko. Fri . "Present Status of NewSUBARU Storage Ring". United States. doi:10.1063/1.2436033.
@article{osti_21049341,
title = {Present Status of NewSUBARU Storage Ring},
author = {Ando, Ainosuke and Hashimoto, Satoshi and Shoji, Yoshihiko},
abstractNote = {Some topics of the operational characteristics and improvements in these two years, in particular, vacuum and orbit, are summarized. The top-up operation realizes the constant flux of synchrotron radiation light at 1 GeV, then many experiments or users become to need the stability of light in less than 1 % range. The orbit stability of the electron beam is the key for this.},
doi = {10.1063/1.2436033},
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}
}
  • Since beam commissioning the beam instability due to ion trapping phenomena has been occasionally observed in the 1.0-1.5GeV NewSUBARU electron storage ring. In this paper we summarize the photo stimulated desorption of gas molecular and the measurements of transverse instabilities related to trapped ions in the NewSUBARU ring.
  • This paper confirms the occurrence of RF synchronized injection from SPring-8 Linac to the NewSUBARU storage ring. NewSUBARU is a 1.5 GeV storage ring with injection energy of 1.0 GeV. Besides the 1.5 GeV user mode, the ring is often operated at 1.0 GeV for EUV users with the so-called top-up injection mode. In this experiment, we use a new synchronization method developed at SPring-8, wherein an instantaneous synchronization between NewSUBARU RF (500 MHz) and Linac RF (2856 MHz) enables a buckets-to-bucket beam transfer. This is one of the key technologies of top-up operations in a storage ring that usesmore » a linac as an injector. The RF clock and timing trigger signal are sent to the Linac from NewSUBARU, and this clock is used to delay units in order to maintain good synchronicity. This works as a standard because it has a system to compensate for transfer-time drift. The arbitrary waveform generator is another key module. It produces a clock 1/32 of that of the Linac RF using the NewSUBARU RF clock. With this system, we eliminated beam loss at the injection due to spillage from the ring RF bucket.« less
  • We report a half-life of the ground state of {sup 184}Re populated by the {sup 185}Re({gamma},n){sup 184}Re reaction from laser Compton scattering {gamma} rays generated through relativistic engineering. The {gamma} rays are provided at the electron storage ring NewSUBARU. The previous experiment using deuteron-induced reactions has yielded a recommended half-life of the 3{sup -} ground state of {sup 184}Re of 38.0{+-}0.5 d, including a possible contribution from the 8{sup +} isomer (T{sub 1/2}=169{+-}8 d) of {sup 184}Re since the presence of the isomer was not known at that time. In contrast, the ({gamma},n) reaction has an advantage to selectively populatemore » the ground state because this reaction does not bring large angular momentum. The measured half-life of 35.4{+-}0.7 d is shorter than the previous half-life by about 7%. This difference is crucial for applications using the activation method.« less
  • We demonstrate our idea to circulate a short and intense linac bunch for some tens of turns in an isochronous ring. We compressed the SPring-8 linac bunch to a few pico-seconds rms by means of the energy compression system (ECS) and the beam transport line to NewSUBARU. The NewSUBARU storage ring was set at quasi-isochronous condition and the bunch circulated for some tens turns after injection keeping the short bunch length.
  • The half-life of an isomer in {sup 164}Ho was measured by using photodisintegration reactions. The photons were generated by Compton scattering of laser photons and relativistic electrons at the electron storage ring NewSUBARU in the super photon ring 8-GeV (SPring-8) facility. The half-life is 36.4{+-}0.3 min. This value is about 3% shorter than the previous value 37.5{sub -0.5}{sup +1.5} min reported in 1966.