Dresden 2014 – scientific programme

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BE: Beschleunigerphysik

BE 4: Diagnostics and Instrumentation II

BE 4.1: Group Report

Tuesday, April 1, 2014, 09:30–10:00, ZEU 255

Development and Status Quo of the Optical Beam Diagnostics System at ELSA^* — •Michael Switka, Sven Zander, Manuel Schedler, Philipp Hänisch, Tobias Schiffer, Dennis Proft, Frank Frommberger, and Wolfgang Hillert — Elektronen-Stretcher-Anlage ELSA, Physikalisches Institut der Universität Bonn

The pulse stretcher ring ELSA delivers polarized and non-polarized electrons with an adjustable beam energy of 0.5 - 3.5 GeV to external experimental stations. Extraction currents available are up to 1 nA with a maximum duty factor of 80%. To meet the growing demands of the user community regarding beam intensity and quality, the upgrade of vital accelerator components is an ongoing process. This includes the improvement of the beam diagnostics in order to resolve and monitor intensity and quality limiting effects. An optical diagnosis system utilizes the available synchrotron radiation at strategic locations. The system includes a streak camera, a fast photo diode and multiple CCD cameras in order to obtain transverse and longitudinal beam images. The streak camera’s maximum resolution of 1 ps provides an equivalent observation bandwidth of up to 1 THz, thus being able to capture fast longitudinal and transverse beam dynamics. Its operation has recently started. The fiber coupled fast photo diode is set-up to provide an on-line filling pattern information. The overall performance of the optical diagnostics and machine relevant measurements are presented. ^* Work funded by the DFG within SFB/TRR16.