Proposal for VEPP-4M beam energy measurement using magnetic spectrometer with Compton calibration and photon detector

A method for circular e−/e+ accelerator beam energy measurement is proposed. A coordinate of an electron (or a positron) in a focusing magnetic spectrometer built in a circular accelerator depends on its energy, two spectrometer parameters, and the circulating beam energy. The spectrometer parameter...

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Bibliographic Details
Published in:Journal of instrumentation 2017-08, Vol.12 (8), p.C08006-C08006
Main Authors: Kaminskiy, V.V., Muchnoi, N.Yu, Zhilich, V.N.
Format: Article
Language:English
Subjects:
Backscattering
Calibration
Energy
Energy measurement
Parameters
Photons
Sensors
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Summary:A method for circular e−/e+ accelerator beam energy measurement is proposed. A coordinate of an electron (or a positron) in a focusing magnetic spectrometer built in a circular accelerator depends on its energy, two spectrometer parameters, and the circulating beam energy. The spectrometer parameters can be determined using minimum electron energies from Compton backscattering with two laser wavelengths, and a coordinate detector for photons. The photon detector is calibrated separately at well-known beam energy. The VEPP-4M collider has appropriate equipment for the method implementation: built-in focusing magnetic spectrometer, Compton calibration system with two lasers and a photon coordinate detector. Thus, the proposed technique could be implemented with minimum efforts; tests and further upgrade are planned. The beam energy can be defined with expected uncertainty better than 10−4.
ISSN:1748-0221
1748-0221
DOI:10.1088/1748-0221/12/08/C08006