Primary and Secondary Beam Stabilization at the ELBE Accelerator Facility


Primary and Secondary Beam Stabilization at the ELBE Accelerator Facility

Justus, M.; Jainsch, R.; Kirschke, T.; Lehnert, U.; Michel, P.; Seidel, W.

Since 2003, ELBE operates as a user facility for fundamental research and life sciences, providing highly brilliant electromagnetic radiation in a broad spectral range, as well as particle beams. The driving source is a 40 MeV, 1 mA electron LINAC in cw mode, utilizing a 13 MHz pulsed thermionic gun and Tesla acceleration technology. Infrared light from two FELs between 3 and 280μm [1] is the foremost secondary radiation used at ELBE. For its applications, different demands in beam stability are put for successful experiments. Therefore, a feedback system for the electron beam position and energy in combination with IR beam intensity feedback using FPGA technology is under development. It is aimed at suppressing beam instabilities caused by thermal behaviour, microphonics and the 50 Hz mains frequency with upper harmonics. This article depicts hardware and software details of the measurement and feedback system and provides first performance results.

Keywords: ELBE; feedback; FEL; stability

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Publ.-Id: 21787