Prompt bunch by bunch synchrotron oscillation detection via a fast phase measurement

Abstract

An electronic system is presented which detects synchrotron oscillations of individual bunches with 4 ns separation. The system design and performance are motivated by the requirements of the proposed B Factory facility at SLAC.Laboratory results are presented which show that the prototype is capable of measuring individual bunch phases with better than 0.5 degree resolution at the 476 MHz RF frequency.

Multibunch feedback—Strategy, technology, and implementation options

“…A laboratory prototype longitudinal feedback sjstem has been developed at the Stanford Linear Accelerator Center 23 This lab model implements a full bpeed (500 MH z) front end phase detector with digital signal processing for a limited number of bunches This prototype system has been demonstrated on the SSRL/SLA.C storage nng SPEAR As the SPEAR storage ring does not have a wideband 1 >cker it is not possible in this configuration to control multiple bunches though it is possible to measure multi bunch effects using the fast front end…”

Longitudinal multibunch feedback experiment with switched filter bank

“…When a beam is tightly bunched in an rf bucket, such as in many electron rings, the precision of timing measurement can be improved by generating a train of pulses with a suitable bandpass filter (such as a Bessel constant delay type), or a microwave pulse to comb generator [4] [5]. The resulting pulse train is then compared with an rf reference by a phase detector.…”