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- T. Kasuga, M. Mochihashi, T. Obina, Y. Tanimoto
KEK, High Energy Accelerator Research Organization, Ibaraki, Japan
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An optical bunch-by-bunch beam diagnostic system, which can detect
oscillations of individual bunches in a multibunch operation, has been
developed. The system is composed of a high-speed light shutter and an
optical beamoscillation detector. The shutter that consists of a pockels
cell and polarizers can be opened or closed in a bunch spacing time (2ns
in KEK-PF) and it can select a light pulse corresponding to a certain
bunch in a bunch train. The beam oscillation detector can detect
oscillations of the pickedout bunch with a spectral analysis method. The
diagnostic system has been installed in KEK-PF Beamline-21, and observed
vertical oscillation of individual bunches due to an instability in the
multi-bunch operation.
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