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| THP059 |
Introducing Fast Orbit Feedback at BESSY
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773 |
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- R. Müller, R. Goergen, R. Lange, I. Mueller, J. Rahn
Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Elektronen-Speicherring BESSY II, Berlin
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Over the more than ten years of BESSY II operation the strategy of eliminating beam perturbation sources and precisely compensating for slow orbit drifts successfully provided the micron and sub-microradian beam stability required by the experiments. In view of increased processing bandwidth at the experiments and the demand for rapid compensation of noise spikes and new, yet unknown excitations a fast orbit feedback aiming at noise suppression in the 1Hz-50Hz range will be installed. Phase I of the implementation foresees fast setpoint transmission plus replacement of all corrector power supplies and aims at higher correction speed. Phase II intends to replace today's multiplexed analog beam position monitors by parallel processing fast digital units to increase correction precision in combination with top-up operation.
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Poster
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| THP063 |
Preparing Slow Controls at BESSY for Fast Orbit Feedback
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782 |
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- R. Lange, R. Goergen, I. Mueller, R. Müller, J. Rahn
Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Elektronen-Speicherring BESSY II, Berlin
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Funding: Work supported by the German Bundesministerium für Bildung und Forschung and the Land Berlin.
The CAN field bus based control system interface to the BESSY power supplies was designed with emphasis on robustness, long-term stability, reproduceability and precision, relying on the basic idea that intrinsic beam stability is achievable at any required level. In preparation for the first phase of a fast orbit feedback system installation, a number of steps at different levels have been taken to enable the existing interface for fast, parallel, synchronized distribution of set point values to corrector power supplies. The design goal was achieving the maximum update rate and a minimum jitter, without major and/or expensive changes to the control system design or hardware. The paper discusses the shortcomings found, the measures taken, and the achievements made.
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