Paper | Title | Other Keywords | Page |
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MOPP027 | First Beam-based Test of Fast Closed Orbit Feedback System at GSI SIS18 | controls, feedback, acceleration, synchrotron | 154 |
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Funding: European Unions Horizon 2020 Research and Innovation programme under Grant Agreement No. 730871 (ARIES). German Academic Exchange Service under Personal Reference No. 91605207. The SIS18 synchrotron of GSI will be used as a booster ring for the SIS100 synchrotron built in the scope of the FAIR project. In order to preserve the beam quality during the whole acceleration ramp, a new closed orbit feedback (COFB) system is implemented at the SIS18 which operates with the existing BPMs and steerer magnets. The system aims for a bandwidth of several 100 Hz and robustness against the variation of the response matrix and the beam rigidity during the ramp. The architecture of the system and the results of the first beam-based test of the COFB hardware are presented. As a first step, the orbit correction is performed over the entire ramp using the response matrix corresponding to injection energy only taking the beam rigidity into account. Experimental observations of the bandwidth limitations arising from the temporal delay of the steerer power supplies and the spatial model variation during the ramp are compared with simulations. It is found that the temporal and the spatial model mismatch have similar effect on the achievable bandwidth of the COFB. |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP027 | ||
About • | paper received ※ 07 September 2019 paper accepted ※ 08 September 2019 issue date ※ 10 November 2019 | ||
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WECO02 | Towards an Adaptive Orbit-Response-Matrix Model for Twiss-Parameter Diagnostics and Orbit Correction at Delta | betatron, storage-ring, feedback, electron | 485 |
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At DELTA, a 1.5-GeV electron storage ring operated by the TU Dortmund University, preliminary tests of an adaptive orbit-response-matrix model were conducted. Closed orbit perturbations corrected by the slow orbit feedback can be buffered and used to update a fit of the bilinear-exponential model with dispersion (BE+d model). This model is a representation of the orbit-response matrix depending on the beta functions, the betatron phases and the tunes in both planes. This work introduces a new fitting recipe to obtain good estimates of the aforementioned quantities and evaluates a BE+d-model represented orbit-response matrix for orbit correction. Numerical studies are shown along with measurement results. | |||
Slides WECO02 [0.657 MB] | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WECO02 | ||
About • | paper received ※ 04 September 2019 paper accepted ※ 08 September 2019 issue date ※ 10 November 2019 | ||
Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | ||