The New Bpm System and Its Commissioning at Pf Ring
نویسندگان
چکیده
We describe the new beam position monitor (BPM) system built for the brilliance-upgraded Photon Factory storage ring. The new system was designed to enable precise and fast measurements to correct the closed orbit distortion (COD), as well as to feed back the orbit position during user-runs. There are 42 BPMs newly installed, amounting to a total of 65 BPMs. All of the newly installed BPMs are calibrated on the test bench using a coaxially strung metallic wire. The measured electrical offsets are typically 200 μm in both direction, which is 1/2 1/3 of those of the old-type BPM. In the signal-processing system, PIN diode switches are employed in order to improve the reliability. In the commissioning of the ring, new BPM system is capable of measuring COD within about 10 ms, and this fast acquisition will allow fast suppression of the vertical beam movement for frequencies up to 1 Hz using a fast global feedback system.
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