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Stable top-up operation at SPring-8.

Hitoshi Tanaka1, Masatoshi Adachi, Tsuyoshi Aoki

  • 1Japan Synchrotron Radiation Research Institute/SPring-8, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan. tanaka@spring8.or.jp

Journal of Synchrotron Radiation
|August 23, 2006
PubMed
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This summary is machine-generated.

Top-up operation at SPring-8 provides highly stable X-ray beams by reducing current fluctuations and suppressing beam oscillation. This advancement enhances experimental precision and efficiency for users.

Area of Science:

  • Synchrotron Radiation Science
  • Accelerator Physics
  • X-ray Optics and Instrumentation

Background:

  • SPring-8 utilizes top-up operation to achieve highly stable X-ray beams.
  • Previous challenges included stored current stability, beam orbit fluctuations, bunch purity, and injection efficiency.

Purpose of the Study:

  • To describe the implementation of top-up operation at SPring-8.
  • To detail the simultaneous achievement of stability in stored current, beam orbit, bunch purity, and injection efficiency.
  • To highlight the utility of stabilized top-up operation for user experiments.

Main Methods:

  • Implementation of top-up operation procedures at SPring-8.
  • Focus on simultaneous optimization of key beam parameters.
  • Routine monitoring and control of stored current, beam orbit, and bunch purity.

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Main Results:

  • Stored current fluctuations reduced to 10(-3).
  • Stored beam oscillation suppressed to a level that does not perturb imaging experiments.
  • Current impurities in empty buckets reduced to 10(-9) over a week, enabling time-resolved spectroscopy.
  • Injection efficiency routinely exceeds 80%, even with small undulator gaps.

Conclusions:

  • Highly stabilized top-up operation at SPring-8 has been successfully achieved.
  • The implemented methods ensure excellent beam stability, purity, and injection efficiency.
  • These advancements significantly benefit a wide range of user experiments at SPring-8.