| Paper | Title | Page |
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| TUPPH064 | A Mechanical Shutter to Select Single Bunch Trains at the FLASH Facility at DESY | 470 |
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A fast, mechanical shutter to select single bunch trains at the FLASH-Facility* at DESY Hamburg is described. This facility is relying on superconducting accelerator modules, which are operated to accelerate bunch-trains with a repetition rate of up to 10 Hz**. This time interval of down to 100ms makes it possible for FEL users to use a mechanical system to select single bunch-trains for sample excitation. The described system is based on a slot-winding cylinder, moving a carbon shutter blade forward and backward while rotating. A commercial electronics (PLC) is used to steer a servo system based on an electronically commutated (EC) low-voltage motor. To select a bunch-train, the motor is started at the time when one train passes the station. During the following 100ms, the cylinder is turned by 180°, leading to a movement of the shutter by 48mm to the fully open position, thus allowing the passage of the following bunch-train. During the next 100ms the rotation is continued to the 360° position, thus blocking the next bunch-train by pushing the shutter back to the fully closed position. The concept, realization, system-tests and first operational experiences are presented.
* Free electron LASer in Hamburg** V. Ayvazyan et al., "First operation of a Free-Electron Laser generating GW power radiation at 32 nm wavelength", Eur. Phys. J. D 37, (2006), 297-303 |