Title :
Beam position monitors for the CESR linac
Author :
Meller, R.E. ; Sagan, D. ; Dunnam, C.R.
Abstract :
A beam position monitor (BPM) system for the Cornell Electron Storage Ring (CESR) linac that is capable of measuring 100-μm displacements for bunches with 108 particles has been developed. Each BPM consists of four stripline electrodes and associated fast analog and digital processing networks. Using 1-GHz-bandwidth DMOS switching technology, a fast analog sampler has been implemented which captures the positive portion of a BPM stripline signal while rejecting the negative-going reflection. Reduced bandwidth postsampling dual slope integration yields effective cancellation of analog switch charge injection and drift effects. A prototype BPM and processor has been tested with both electron and positron beams, and the installed final version has been tested with electrons only. These tests verify the basic operation and noise performance of the system
Keywords :
beam handling equipment; beam handling techniques; linear accelerators; noise; 1-GHz-bandwidth DMOS switching technology; CESR linac; Cornell Electron Storage Ring; analog switch charge injection; beam position monitor; digital processing networks; drift effects; dual slope integration; fast analog sampler; negative-going reflection; noise performance; positron beams; stripline electrodes; Displacement measurement; Electron beams; Linear particle accelerator; Particle beam measurements; Particle beams; Position measurement; Storage rings; Stripline; Switches; Testing;
Conference_Titel :
Particle Accelerator Conference, 1989. Accelerator Science and Technology., Proceedings of the 1989 IEEE
Conference_Location :
Chicago, IL
DOI :
10.1109/PAC.1989.73482
