A beam-position monitor system at the VEPP-4M electron−positron collider

The VEPP-4M storage ring has been designed for experiments with colliding electron−positron beams, a synchrotron radiation beam, and extracted γ-ray beams at energies of 1−5 GeV. A correct equilibrium beam orbit must be kept in the storage ring to maintain the required experimental conditions. A bea...

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Bibliographic Details
Published in:Instruments and experimental techniques (New York) 2017-09, Vol.60 (5), p.679-685
Main Authors: Bekhtenev, E. A., Karpov, G. V., Piminov, P. A.
Format: Article
Language:English
Subjects:
Distributors
Electrical Engineering
Electron beams
Electron-positron accelerators
Measurement Science and Instrumentation
Modules
Nuclear Experimental Technique
Physical Chemistry
Physics
Physics and Astronomy
Position measurement
Positron beams
Signal processing
Synchrotron radiation
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Summary:The VEPP-4M storage ring has been designed for experiments with colliding electron−positron beams, a synchrotron radiation beam, and extracted γ-ray beams at energies of 1−5 GeV. A correct equilibrium beam orbit must be kept in the storage ring to maintain the required experimental conditions. A beam position monitor system is used for this purpose. It includes 54 beam position monitors, monitor signal-processing modules, and synch signals distributors. In 2013–2016, new signal processing modules with a high time resolution were developed and installed at the VEPP-4M storage ring. These have two main advantages over the old modules. First, the new modules allow separate position measurements of electron and positron bunches at an interval between the bunch signals as long as 18 ns. Second, they are able to perform fullfledged turn-by-turn beam position measurements, which is very important for adjustment of the storagering parameters. Turn-by-turn beam position measurements can be performed during injection of a new beam, beam kicking, beam loss, or at an arbitrary instant of time. The structures and main features of the new modules are described, the measurement accuracy is analyzed, and some results of their operation at the storage ring are presented.
ISSN:0020-4412
1608-3180
DOI:10.1134/S0020441217050025