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Description
Since the beginning of the ESRF-EBS operation in 2020, the storage ring has been routinely operated with an artificially increased vertical emittance (10 pm, 20 pm, or 40 pm depending on the filling mode) to enhance beam lifetime. Until recently, beam excitation was achieved using pseudo-random noise with a relatively large bandwidth*.
We recently have used the “Tune PLL” functionality of the Multi-Bunch Feedback processor, developed at Diamond Light Source (referred to as DLS-MBF), to excite a specific sideband of the transverse betatron resonance with high precision. This technique, initially developed and tested at Diamond Light Source**, requires more careful tuning and parameter adjustment but has demonstrated superior performance at the ESRF compared to the previously used white-noise excitation.
In this paper, we describe the implementation of the Tune PLL excitation at the ESRF and present results showing its benefits in terms of beam lifetime improvement, emittance stability, and halo reduction. Using a pinhole emittance measurement, we were able to observe very small emittance fluctuations (down to 50 fm rms) and compare the resulting emittance fluctuations produced by the different blow-up methods.
Footnotes
- N. Carmignani et al., “Emittance blow-up with a magnetic shaker at different chromaticities”, IPAC’24, paper TUPG26
** S. Preston et al., “Emittance Feedback for the Diamond-II Storage Ring Using Resonant Excitation”, IPAC’22, paper TUPOMS035
S. Preston et al., “Measurements for Emittance Feedback based on Resonant Excitation at Diamond Light Source", IBIC’22, paper WEP37
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