Abstract
ABSTRACT High power wiggler or undulator beamlines at synchrotron radiation sources need devices that stop or reduce the size of the beam. This paper describes a new photon shutter/slit assembly that takes advantage of the high collimation of the x-raybeam in the vertical direction. In the center of a water-cooled copper block, an opening has been configured that has anaperture of 10 x 120 2 with a length of 100 mm. This copper block is rotated around the center of the length axis. There are two modes of operation for the rotation. One mode switches the beam on and off. The other controls the rotation, whichresults in a variable vertical slit. The angle of this rotation reduces the power density on the cooled surface of the slit by afactor larger than ten. The advantage of this assembly in comparison to conventional shutter and slit designs is discussed. 1. INTRODUCTIONFive new high power x-ray wiggler and undulator beamlines have started operation at the Hamburger Synchrotronstrahlungslabor (HASYLAB) in 1992.' The total power of these beamlines, installed at the storage ring DORIS
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