Beam Stability R&D for the APS MBA Upgrade

Conference · Thu Jan 01 04:00:00 EST 2015

OSTI ID:1335915

Sereno, Nicholas S.; Arnold, Ned D.; Bui, Hanh D.; Carwardine, J.; Decker, Glenn; Emery, Louis; Farnsworth, Richard; Keane, Robert T.; Lenkszus, F.; Lill, Robert M.; Lipa, Robert A.; Vesseli, S.; Xu, Shifu; Yang, Bingxin

Beam diagnostics required for the APS Multi-bend acromat (MBA) are driven by ambitious beam stability requirements. The major AC stability challenge is to correct rms beam motion to 10% the rms beam size at the insertion device source points from0.01 to 1000 Hz. The vertical plane represents the biggest challenge forAC stability, which is required to be 400 nm rms for a 4-micron vertical beam size. In addition to AC stability, long-term drift over a period of seven days is required to be 1 micron or less. Major diagnostics R&D components include improved rf beam position processing using commercially available FPGA-based BPM processors, new X-ray beam position monitors based on hard X-ray fluorescence from copper and Compton scattering off diamond, mechanical motion sensing to detect and correct long-term vacuum chamber drift, a new feedback system featuring a tenfold increase in sampling rate, and a several-fold increase in the number of fast correctors and BPMs in the feedback algorithm. Feedback system development represents a major effort, and we are pursuing development of a novel algorithm that integrates orbit correction for both slow and fast correctors down to DC simultaneously. Finally, a new data acquisition system (DAQ) is being developed to simultaneously acquire streaming data from all diagnostics as well as the feedback processors for commissioning and fault diagnosis. Results of studies and the design effort are reported.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: USDOE Office of Science - Office of Basic Energy Sciences
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 1335915
• Country of Publication: United States
• Language: English

Related Subjects

APS MBA Upgrade
Beam Stability
R&D