title: Chopper system for time resolved experiments with synchrotron radiation.
abstract: A chopper system for time resolved pump-probe experiments with x-ray beams from a synchrotron is described. The system has three parts: a water-cooled heatload chopper, a high-speed chopper, and a millisecond shutter. The chopper system, which is installed in beamline ID09B at the European Synchrotron Radiation Facility, provides short x-ray pulses for pump-probe experiments with ultrafast lasers. The chopper system can produce x-ray pulses as short as 200 ns in a continuous beam and repeat at frequencies from 0 to 3 kHz. For bunch filling patterns of the synchrotron with pulse separations greater than 100 ns, the high-speed chopper can isolate single 100 ps x-ray pulses that are used for the highest time resolution. A new rotor in the high-speed chopper is presented with a single pulse (100 ps) and long pulse (10 micros) option. In white beam experiments, the heatload of the (noncooled) high-speed chopper is lowered by a heatload chopper, which absorbs 95% of the incoming power without affecting the pulses selected by the high speed chopper.
authors.affiliation: European Synchrotron Radiation Facility, BP 220, Grenoble Cedex 38043, France.
authors.forename: Marco
authors.initials: M
authors.lastname: Cammarata
authors.forename: Laurent
authors.initials: L
authors.lastname: Eybert
authors.forename: Friederike
authors.initials: F
authors.lastname: Ewald
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Reichenbach
authors.forename: Michael
authors.initials: M
authors.lastname: Wulff
authors.forename: Philip
authors.initials: P
authors.lastname: Anfinrud
authors.forename: Friedrich
authors.initials: F
authors.lastname: Schotte
authors.forename: Anton
authors.initials: A
authors.lastname: Plech
authors.forename: Qingyu
authors.initials: Q
authors.lastname: Kong
authors.forename: Maciej
authors.initials: M
authors.lastname: Lorenc
authors.forename: Bernd
authors.initials: B
authors.lastname: Lindenau
authors.forename: Jürgen
authors.initials: J
authors.lastname: Räbiger
authors.forename: Stephan
authors.initials: S
authors.lastname: Polachowski
mesh_terms: D007834:Lasers; D017356:Synchrotrons / Q000295:instrumentation*; D014965:X-Rays