JASRI/SPring-8, Hyogo-ken, Japan
JASRI/SPring-8, Hyogo-ken, Japan
* T. Watanabe et al., Proc. of IPAC 2014.
| Paper | Title | Page |
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| TUAB1 | Correction of Nonlinear Coupling Resonances in the SPring-8 Storage Ring | 1329 |
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| The correction of the lattice nonlinearity of the storage rings is crucial for the enlargement of the dynamic aperture of the storage rings, which in general leads to the higher injection efficiency and the longer lifetime. At the SPring-8 storage ring, it is realized that the higher order coupling resonances are considerably excited. After the usual correction of the nonlinear dynamics in terms of the normal sextupole magnets, we suppress one of the resonances by using the skew sextupole magnets for the purpose of further improving the dynamic aperture. As a result of the correction by the skew sextupoles, the reckoned improvement of the injection efficiency and the lifetime is achieved. Furthermore, at the SPring-8 storage ring, it is observed that the error magnetic field of a particular insertion device (ID) excites the higher nonlinear coupling resonance of the skew octupoles, which remarkably deteriorates the injection efficiency. In order to correct the coupling resonance, we have installed the octupole magnets at the ID, by which we restore the injection efficiency. | ||
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Slides TUAB1 [3.275 MB] | |
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUAB1 | |
| Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | |
| WEPMA050 | Permanent Dipole Magnet R&D for SPring-8-II | 2883 |
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Permanent magnets are promising for future light source machines with its compactness, small power consumption. We have proposed a variable-field permanent dipole magnet and demonstrated its performance*. Following the result, a prototype magnet with a longitudinal field gradient and a magnetic shunt circuit was designed and fabricated. The longitudinal field gradient enables a lower beam emittance and the magnetic shunt circuit improves a temperature stability of the magnetic field strength. Simulation studies and measurement results are presented in this report. The interference of magnetic fields between neighboring magnets was also investigated.
* T. Watanabe et al., Proc. of IPAC 2014. |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPMA050 | |
| Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | |