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• W304671851 abstract "BECON-95 SLAC-PUB-5525 LBL-30604 May 1991 (A/I) Stanford Linear Accelerator Center, Stanford University, Stanford, CA 94309 USA and Prompt Bunch by Bunch Synchrotron Oscillation Detection via a Fast Phase Measurement· D_ Bri~s, P_ Corredoura l. D. Fox, A. Gioumousis W. HosseinI, L. Klaisner, l.-t. Pellegrin, K. A. Thompson G. Lambertson Lawrence Berkeley Laboratory, University of California, Berkeley, CA 94720 USA Abstract: An electronic system is presented which de- tects 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. INTRODUCTION energy correction stages of the feedback system . Our pro- posed feedback design uses bunch by bunch (time do- main) strate~ that treats each bunch as an independent oscillator. 16-11J This approach has the additional ad- vantage that It damps not only coupled bunch oscillations, but any disturbance, 8uch as injection timing errors, that may induce energy oecillations. PRINCIPLE OF OPERATION Many accelerator facilities have incorporated feedback systems to suppress the growth of coupled-bunch oscilla- tions [1-5J. The proposed SLAC-LBL-LLNL B Factory design presents several challenges in the design of trans- verse and longitudinal feedback systems. To achieve a de- sign luminosity of 3 10 33, the B Factory will contain 1658 bunches per ring (total current 1.5 A for the high en- ergy ring, 2.1 A for the low energy ring), spaced every other RF bucket at the 476 MHz RF frequency. This large num- ber of bunches, plus the short (4.2 ns) inter-bunch period, forces difficult constraints on the detection, processing and Figure I presents a system constructed to test and evaluate various signal detection schemes for the longitu- dinal feedback system. In this laboratory prototype we have implemented a two bunch system with a time struc- ture similar to the planned accelerator. The master oscil- lator of this model uses a 102 MHz oscillator that is har- monically multiplied by a factor of 28 to generate a phase synchronous 2856 MHz reference. The 102 MHz oscillator provides the excitation for two step recovery diodes which generate 60 ps FWHM impulses to simulate beam bunches. Two analog phase shifters are used to adjust the spacing of the bunches relative to the 102 MHz master oscillator, and these phase shifters allow simulated synchrotron oscil- lations to be impressed on the 60 ps impulses. We space l 1'uls. to Comb Combiner +-mod Adjust r.lativ. phases of 102 MHz for 4 nslmpulse spaang. Phase modulat. bundl timng at the syndlrotron frequency. RF +-adj F Video DAC .e9 ~~~$~M~H~Z~ ____________ ~~~ __ ~ ___ ! Ioci<ed source ~$MHz RF amp F Figure 1. Block diagram of the prot.otype front end circuitry. This system converts a. bea.m signal impulse into & 2856 MHz 8· cycle tone burst, &Dd compares the phase of the burst aga.inst a. reference oscilla.tor. A 250 MHz AID digitizes the phase ea.ch bunch crossing. The proposed B Factory design has 1658 bunches with & 4.2 ns bunch interyal . The labora.tory prototype uses 2 step recovery diodes a.nd phase shifters to simula.te bunches with independent synchrotron osciU&tioDS. * Work supporled by Deparlmenl of Energy conlracl DE-ACOJ-76SFOOSIS. Contributed to tbe IEEE Particle Accelerator Conference, San Francisco, CA, May 6-9, 1991" @default.
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• W304671851 title "Prompt Bunch by Bunch Synchrotron Oscillation Detection via a Fast Phase Measurement" @default.
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