PEP-II injection timing and controls

Conference · Tue Jul 01 04:00:00 EDT 1997

OSTI ID:521624

Bharadwaj, V; Browne, M; Crane, M; Gromme, T; Himel, T; Ross, M; Stanek, M ^[1]; Ronan, M ^[2]

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1. Stanford Linear Accelerator Center, Menlo Park, CA (United States)
2. Lawrence Berkeley National Lab., CA (United States)

Hardware has been built and software written and incorporated in the existing SLC accelerator control system to control injection of beam pulses from the accelerator into the PEP-II storage rings currently under construction. Hardware includes a CAMAC module to delay the machine timing fiducial in order that a beam pulse extracted from a damping ring will be injected into a selected group of four 476 MHz buckets in a PEP-II ring. Further timing control is accomplished by shifting the phase of the bunches stored in the damping rings before extraction while leaving the phase of the PEP-II stored beam unchanged. The software which drives timing devices on a pulse-to-pulse basis relies on a dedicated communication link on which one scheduling microprocessor broadcasts a 128-bit message to all distributed control microprocessors at 360 Hz. PEP-II injection will be driven by the scheduling microprocessor according to lists specifying bucket numbers in arbitrary order, and according to scheduling constraints maximizing the useful beam delivered to the SLC collider currently in operation. These lists will be generated by a microprocessor monitoring the current stored per bucket in each of the PEP-II rings.

• Research Organization: Stanford Linear Accelerator Center, Menlo Park, CA (United States); Lawrence Berkeley National Lab., CA (United States)
• Sponsoring Organization: USDOE Office of Energy Research, Washington, DC (United States)
• DOE Contract Number: AC03-76SF00515; AC03-76SF00098
• OSTI ID: 521624
• Report Number(s): SLAC-PUB--7600; CONF-970503--210; ON: DE97008420
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
BEAM INJECTION
COMPUTERIZED CONTROL SYSTEMS
DESIGN
IMPLEMENTATION
PEP STORAGE RINGS
STANFORD LINEAR COLLIDER
TIMING CIRCUITS