Tuning the narrow-band beam position monitor sampling clock to remove the aliasing errors in APS storage ring orbit measurements.

Conference · Mon Jan 01 04:00:00 EST 2007

DOI:https://doi.org/10.1109/PAC.2007.4440019· OSTI ID:1014787

Sun, X; Singh, O ^[1]

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1. Accelerator Systems Division (APS)

The Advanced Photon Source storage ring employs a real-time orbit correction system to reduce orbit motion up to 50 Hz. This system uses up to 142 narrow-band rf beam position monitors (Nbbpms) in a correction algorithm by sampling at a frequency of 1.53 kHz. Several Nbbpms exhibit aliasing errors in orbit measurements, rendering these Nbbpms unusable in real-time orbit feedback. The aliasing errors are caused by beating effects of the internal sampling clocks with various other processing clocks residing within the BPM electronics. A programmable external clock has been employed to move the aliasing errors out of the active frequency band of the real-time feedback system (RTFB) and rms beam motion calculation. This paper discusses the process of tuning and provides test results.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 1014787
• Report Number(s): ANL/ASD/CP-59537
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
ADVANCED PHOTON SOURCE
ALGORITHMS
BEAM POSITION
FEEDBACK
MONITORS
PROCESSING
SAMPLING
STORAGE RINGS
TUNING