TUOZSP2
KEK, Ibaraki, Japan
CERN, Meyrin, Switzerland
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TUOZSP2 |
Chromatic X-Y Coupling Correction by Tilting Sextupole Magnets in the SuperKEKB Positron Ring | |
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| Chromatic x-y coupling correction at the interaction point was carried out using skew sextupole field created by tilting the sextupole magnets in the SuperKEKB positron ring. Twenty four sextupole magnets are mounted on a tilting table and their tilt angles can be varied form - 30 degree to + 30 degree remotely to control the ratio of the skew to normal sextupole magnetic field components. In the 2021c run, one of the chromatic coupling parameters was varied using different setups of the tilting angles of the 24 sextupole magnets for the first time in a collider. It was found that the emittance growth at the primary (nux-nuy-nus=n) and secondary (nux-nuy-2nus=n) synchro-beta resonance lines can be controlled by tilting the sextupole magnets. Luminosity increase followed after optimizing the chromatic coupling parameters and finding a better tune working point. The study results are summarized in the paper. | ||
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Slides TUOZSP2 [19.499 MB] | |
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