Study Results and Plans for Future Improvement of the NSLS-II FOFB System
- Brookhaven National Lab. (BNL), Upton, NY (United States)
Currently, the fast orbit feedback (FOFB) system correct the transverse orbit in both planes via air coil magnets installed over low conductivity sections of vacuum chamber (stainless steel bellows) with a fast acquisition (FA) that samples at 10kHz. Bandwidth of a few kHz has been achieved (power-supply + corrector + vacuum chamber) for the purpose that the FOFB bandwidth limitation is not anymore limited by the correctors. The bandwidths of the FOFB system in both planes have been experimentally characterized in the open-loop condition via sinwave excitation method. They are significantly lower than the measurements (2.5kHz in x) done by Weixing Chen et al when the control system was largely bypassed, only from PSI to fast correctors, final to BPM. The estimated dI/dt as a function of the frequency from the beam noise spectrum has been compared to the slew rate of the power supply. The most recent study evidences: after the optimization of fast corrector compensation circuit, the power supply system along shows the 3dB bandwidth of 5.6kHz in the horizontal plane and 3.5kHz in the vertical plane. Preliminary beam studies indicate the potential increase of the system bandwidth and the gain within the FOFB bandwidth. Finally, the plan for combing the FOFB and SOFB systems to correct down to DC has been discussed.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- DOE Contract Number:
- SC0012704
- OSTI ID:
- 1566872
- Report Number(s):
- BNL-211215-2019-TECH; NSLSII-ASD-TN-283; TRN: US2000155
- Country of Publication:
- United States
- Language:
- English
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