Abstract

A Programmable Synchronization Unit (PSU, 135-726) has been designed as an element of the new timing system for the Stanford Linear Collider (SLC) project to provide synchronization signals needed for various apparatus in the SLC Damping Ring, or anywhere it is necessary to monitor longer than the fiducial period (?2.8 ?s). A 119 MHz pulse train derived from the 476 MHz main drive line and superimposed with 360 Hz fiducial signal is the frequency source. Following a programmable delay D of up to 4.4 ?s, the PSU can deliver N pulses of width W (in increments of 8.4 ns) with a pulse period of P (in increments of 58.8 ns, the damping ring half period). The device may be programmed at any time during the interfiducial period.

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