Profile measurement of circulating electrons in a synchrotron by inserting a carbon wire

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 922; pp. 108 - 113
• Main Authors: Obara, Y., Ishikawa, T., Hama, H., Hinode, F., Kanda, H., Kashiwagi, S., Miyabe, M., Muto, T., Ozawa, K., Shimizu, H., Tokiyasu, A.O.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.04.2019
• Subjects: Electron beam size; Internal radiator; Meson photoproduction; Tagged photon; Meson photoproduction; Internal radiator; Electron beam size; Tagged photon
• ISSN: 0168-9002; 1872-9576
• DOI: 10.1016/j.nima.2019.01.007

An internal radiator made of a carbon wire is employed to produce bremsstrahlung-photon beams for meson photoproduction experiments from circulating electrons in a synchrotron at the Research Center for Electron Photon Science, Tohoku University. The horizontal electron-beam size at the radiator location is determined from the decay rate of the resultant photon intensity as a function of the distance between the fixed position of the radiator and the centroid of the electron beam. The horizontal beam size at the radiator location is determined to be 0.74 mm with a statical error less than 0.01 mm for 1.3-GeV circulating electrons. The horizontal correlation between the position and momentum direction of the electron beam is also measured. The horizontal size and correlation are well-reproduced by the design values of the parameters of the synchrotron.