NSLS-II Seminar

"High Speed Choppers for X-Ray or Light Pulse Selection"

Presented by Bernd Eberhard Lindenau, Forschungszentrum Juelich GmbH ( FZJ ), Central Department of Technology ( ZAT), Magnetic Bearings and Drives, Germany

Monday, July 9, 2012, 1:30 pm — 703 Large Conference Room

For experiments, which ask for light pulses with a sequence different from the bunch mode predominantly offered by the synchrotron source, high speed pulse selectors have been developed. A fast rotating triangular shaped disk with the beam channel grooved along one of the disk sides serves as shutter element in the beam line for hard x-rays. The maximum open sequence of about 1000Hz is limited by the tolerable rotation speed of the shutter rotor, which is machined from high strength titanium alloy. Open times of the beam channel in the range of 500ns and +/-2 ns phase
stability with respect to the bunch clock are realized with the present systems, which are used in combination with a probing laser for time resolved experiments at ESRF, APS, SPring8 and PF-AR. A 1.25 MHz chopper for light pulses is currently under development for operation at BESSY. It is
based on the same platform for magnetic rotor suspension and drive control. This chopper is equipped with a slotted aluminium disk to allow open periods of 140ns. The design criteria of these systems will be presented and technical feasibilities will be addressed.

Hosted by: Daniel Bacescu

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