Dedicated beam position monitor pair for model-independent lattice characterization at NSLS-II
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arXiv
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866911490757361664 |
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| author | Li, Yongjun Ha, Kiman Padrazo, Danny Kosciuk, Bernard Bacha, Belkacem Seegitz, Michael Rainer, Robert Mead, Joseph Yang, Xi Tian, Yuke Todd, Robert Smaluk, Victor Cheng, Weixing |
| author_facet | Li, Yongjun Ha, Kiman Padrazo, Danny Kosciuk, Bernard Bacha, Belkacem Seegitz, Michael Rainer, Robert Mead, Joseph Yang, Xi Tian, Yuke Todd, Robert Smaluk, Victor Cheng, Weixing |
| contents | This paper reports recent lattice characterization results obtained at the National Synchrotron Light Source II (NSLS-II) storage ring, conducted without reliance on a lattice model. A pair of beam position monitors (BPMs) with bunch-by-bunch (B$\times$B) resolution, were recently installed in a section of the storage ring free of magnetic fields. The new BPM pair measured the beam, or bunch's transverse Poincaré map precisely after the beam was excited. Linear one-turn-matrices (OTM) were then derived, and from these, the 4-dimensional coupled Twiss parameters were extracted at the locations of the BPM pair. By normalizing beam oscillation amplitudes with the Twiss parameters, the global action-variables were obtained. These action-variables facilitated the measurement of the local Twiss parameters observed by other BPMs independent on lattice model. This method is general, and particularly useful in certain scenarios such as a round beam mode in a diffraction-limited light source ring. We applied it to assess both weakly and strongly coupled lattices at the NSLS-II ring. Through analysis of the strongly coupled lattice, the quadrupole tilt errors were estimated to be less than 400 \siμrad. Utilizing the BPMs' B$\times$B resolution, for the first time we observed the variations of the linear lattice along a long bunch-train. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_16660 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Dedicated beam position monitor pair for model-independent lattice characterization at NSLS-II Li, Yongjun Ha, Kiman Padrazo, Danny Kosciuk, Bernard Bacha, Belkacem Seegitz, Michael Rainer, Robert Mead, Joseph Yang, Xi Tian, Yuke Todd, Robert Smaluk, Victor Cheng, Weixing Accelerator Physics This paper reports recent lattice characterization results obtained at the National Synchrotron Light Source II (NSLS-II) storage ring, conducted without reliance on a lattice model. A pair of beam position monitors (BPMs) with bunch-by-bunch (B$\times$B) resolution, were recently installed in a section of the storage ring free of magnetic fields. The new BPM pair measured the beam, or bunch's transverse Poincaré map precisely after the beam was excited. Linear one-turn-matrices (OTM) were then derived, and from these, the 4-dimensional coupled Twiss parameters were extracted at the locations of the BPM pair. By normalizing beam oscillation amplitudes with the Twiss parameters, the global action-variables were obtained. These action-variables facilitated the measurement of the local Twiss parameters observed by other BPMs independent on lattice model. This method is general, and particularly useful in certain scenarios such as a round beam mode in a diffraction-limited light source ring. We applied it to assess both weakly and strongly coupled lattices at the NSLS-II ring. Through analysis of the strongly coupled lattice, the quadrupole tilt errors were estimated to be less than 400 \siμrad. Utilizing the BPMs' B$\times$B resolution, for the first time we observed the variations of the linear lattice along a long bunch-train. |
| title | Dedicated beam position monitor pair for model-independent lattice characterization at NSLS-II |
| topic | Accelerator Physics |
| url | https://arxiv.org/abs/2406.16660 |