A pulsed, split-parallel plate chopper has been designed, built, and installed as part of the preinjector of the SSRL Injector.Its function is to allow into the linear accelerator three consecutive S-band bunches from the long bunch train provided by a RF gun. A permanent magnet deflector (PMD) at the chopper entrance deflects the beam into an absorber when the chopper pulse is off. The beam is swept across a pair of slits at the beam output end when a 7 kV, IO-ns rise-time pulse passes in the opposite direction through the 75 R stripline formed by the deflecting plates. Bunches exiting the slits have their trajectories corrected by another PMD, and enter the linac. Beam tests demonstrate that the chopper functions as expected.
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