DocumentCode :
2318025
Title :
A technique for improving the accuracy and dynamic range of beam position-detection equipment
Author :
Wells, F.D. ; Jachim, S.P.
Author_Institution :
Los Alamos Nat. Lab., NM, USA
fYear :
1989
fDate :
20-23 Mar 1989
Firstpage :
1595
Abstract :
Beam position detection equipment often uses circuits that convert amplitude-modulated position signals to phase modulation. These signals are limited to remove amplitude variations, and phase-detected to obtain analog position information. The phase-modulated signals are clipped by limiters that must be closely phase-matched in pairs over the signal intensity range of interest. Accuracy and dynamic range are determined principally by the phase match between the limiters. When the duration of the beam is a few microseconds or more, significant improvements can be obtained by down-converting the RF signals to an intermediate frequency near 10 MHz. Limiter circuits are available that can be closely matched in pairs at 10 MHz over a 60-dB signal amplitude range. For example, the peak phase deviation measured among 30 matched pairs was <0.4°, corresponding to a phase tracking error of <0.1 dB. This exceptional matching enabled beam position measurements over a 50-dB dynamic range of signal intensity. A description of the detection technique and the limiter is given
Keywords :
beam handling equipment; beam handling techniques; RF signals; amplitude-modulated position signals; analog position information; beam position-detection equipment; limiter circuits; peak phase deviation; phase modulation; phase tracking error; phase-matched; phase-modulated signals; signal intensity; Circuits; Dynamic range; Frequency conversion; Laboratories; Local oscillators; Phase detection; Phase measurement; Phase modulation; Position measurement; RF signals;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Particle Accelerator Conference, 1989. Accelerator Science and Technology., Proceedings of the 1989 IEEE
Conference_Location :
Chicago, IL
Type :
conf
DOI :
10.1109/PAC.1989.72863
Filename :
72863
Link To Document :
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