8th International Particle Accelerator Conference | |
Possibilities for transverse feedback phase adjustment by means of digital filters | |
Kotzian, G.^1 | |
CERN, Geneva, Switzerland^1 | |
关键词: Analytical expressions; Beam positions; Feedback phase; Fractional tune; Free parameters; Phase adjustment; Transverse feedback system; Vector combinations; | |
Others : https://iopscience.iop.org/article/10.1088/1742-6596/874/1/012089/pdf DOI : 10.1088/1742-6596/874/1/012089 |
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来源: IOP | |
【 摘 要 】
In transverse feedback systems a phase adjustment is generally required to convert a beam position signal from a pick-up into a momentum correction signal used by a transverse kicker. In this paper we outline several possibilities for phase adjustments using only single pickups or the vector combination of two pick-ups. Analytical expressions are given as a function of the fractional tune and the betatron phase advance between the pick-up location and the kicker. The shortest possible digital filter is formulated, including a notch for closed orbit suppression and a free parameter to adjust for betatron phase. We introduce a novel, fully parametrized digital filter with the feature to be insensitive to variations in fractional tune. Examples are given for the SPS transverse feedback system and compared with measurements.
【 预 览 】
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Possibilities for transverse feedback phase adjustment by means of digital filters | 212KB | download |