| Paper |
Title |
Page |
| MOZCG01 |
Top-Up Operation in Light Sources
|
36 |
| |
- H. Ohkuma
JASRI/SPring-8, Hyogo-ken
|
|
| |
The top-up operation for user experiments has been performed at several light sources, and at most of the new light sources the top-up operation is considered in their design phase. In this paper, an overview of the top-up status in light sources is presented, including the performance of injectors for top-up in light sources, technological aspects, examples and operational data from existing machines and proposed upgrades, etc.
|
|
|
Slides
|
|
| THPC070 |
Symmetry Restoration of the SPring-8 Storage Ring by Counter-sextupole Magnets
|
3149 |
| |
- K. Soutome, S. Daté, T. Fujita, K. Fukami, C. Mitsuda, A. Mochihashi, H. Ohkuma, M. Oishi, S. Sasaki, J. Schimizu, Y. Shimosaki, M. Shoji, M. Takao, K. Tsumaki, H. Yonehara, C. Zhang
JASRI/SPring-8, Hyogo-ken
- S. Matsui, H. Takebe, H. Tanaka
RIKEN/SPring-8, Hyogo
|
|
| |
In the SPring-8 storage ring there are four magnet-free long straight sections of about 30m. These were realized in 2000 by locally rearranging quadrupole and sextupole magnets. In modifying the optics we took care of the periodicity of cell structure, especially of sextupole field distribution along the ring. To keep the periodicity high and hence the dynamic aperture large, we adopted a scheme in which "betatron phase matching" and "local chromaticity correction" are combined. In this scheme the dynamic aperture for on-momentum electrons is kept by the phase matching and that for off-momentum electrons is enlarged by the local chromaticity correction with weak sextupoles (SL). After modifying the lattice, we tried to recover the symmetry of the ring further and found that a harmful effect of nonlinear kick due to SL can be minimized by additional "counter-sextupole magnets" placed 180 degrees apart in horizontal betatron phase from SL. We installed such counter-sextupoles in every long straight sections and confirmed that the aperture was improved. In the paper we discuss these topics showing experimental data of injection efficiency, momentum acceptance, etc.
|
|