Speaker
Description
The Hefei Advanced Light Facility (HALF) is a fourth-generation synchrotron radiation light source in the low-energy region, based on a diffraction-limited storage ring. The high stability requirements for the beam orbit in a diffraction-limited storage ring necessitate that the digital beam position monitor processor (DBPM) achieve high-precision measurements. While compensating for inter-channel inconsistencies, the total latency must be minimized to enable fast orbit feedback control. The dual-pilot frequency technique is used in HALF's DBPM to compensate for channel inconsistencies and improve measurement resolution. Additionally, the hardware and software algorithm designs have been optimized to balance resolution and latency, ensuring that the latency is less than 90 μs while meeting resolution requirements. The development and fabrication of the prototype and engineering prototype have been completed. This paper will introduce the hardware and software design of the self-developed DBPM, along with laboratory test results and beam test results conducted at the Shanghai Synchrotron Radiation Facility (SSRF）. Both laboratory and beam test results meet the specifications. During beam test, the horizontal and vertical turn-by-turn (TBT) resolutions were 467.53 nm and 447.47 nm; the horizontal and vertical fast acquisition (FA) resolutions were 88.32 nm and 88.63 nm; and the horizontal and vertical slow acquisition (SA) resolutions were 44.60 nm and 43.60 nm.
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