JASRI/SPring-8, Hyogo-ken, Japan
RIKEN SPring-8 Center, Hyogo, Japan
*SPring-8-II Conceptual Design Report (2014), http://rsc.riken.jp/pdf/SPring-8-II.pdf
WEIZSP1
RIKEN SPring-8 Center, Hyogo, Japan
| Paper | Title | Page |
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| MOPOTK017 | Update of Lattice Design of the SPring-8-II Storage Ring Towards 50 pmrad | 477 |
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The storage ring lattice of SPring-8-II has been under optimization towards a low emittance of around 50 pmrad, which was initially set at 150 pmrad*. The optimization concept is based on the effective use of extra-radiation damping from damping wigglers installed in the four long straight sections each 30 m long in length. For this purpose, we have been re-optimizing the linear and nonlinear optics so as to reduce the radiation loss from the bending magnets. In parallel, since the emittance variation due to the gap change of the IDs can be an obstacle for conducting precise experiments, we are investigating a new passive method to suppress the emittance variation without any feedback system. In the paper, we report on these details.
*SPring-8-II Conceptual Design Report (2014), http://rsc.riken.jp/pdf/SPring-8-II.pdf |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-MOPOTK017 | |
| About • | Received ※ 05 June 2022 — Revised ※ 15 June 2022 — Accepted ※ 17 June 2022 — Issue date ※ 27 June 2022 | |
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WEIZSP1 |
Interpretation of Particle Motion in a Circular Accelerator as Diffraction of Light | |
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| Inspired by Fermat’s principle of geometric optics 200 years ago, famous Dr. Hamilton built Hamiltonian mechanics based on the principle of minimal action. Since then, optics and mechanics have developed while stimulating each other. A new hidden link between optics and mechanics was recently found on particle motion in a circular accelerator. A forced harmonic oscillator is often used as a model to describe particle motion in a circular accelerator. Such a model sometimes assumes that, eigen frequency or frequency of the external force is changed slowly with time to simulate, for example, resonance crossing, beam dump by turning off the RF power, resonance extraction, etc. in circular accelerators. In such cases, particle motion is well described by using formulae for Fresnel or Fraunhofer diffraction, depending on simulation conditions. This presentation will comprehensively show what is essential mechanism to link resonance phenomena of mechanics and optical diffraction, relation between the real accelerator model and the harmonic oscillator, and possibility of this knowledge to apply investigation of beam dynamics in a particle accelerator. | ||
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Slides WEIZSP1 [5.755 MB] | |
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