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Figure 3
This flow chart details the operating sequence of the high-speed linear VCA shutter. When the initial voltage is applied, the storage capacitors charge. The timing device sends a signal to the electronic controller to dump current through the coils. An electromagnetic field is generated owing to the current in the coil loops that causes the VCA head to be pushed away from the fixed magnet configuration. The electronic controller holds the coil in the closed position by applying a small `holding' voltage. To open the shutter, the timing device sends another signal which is reversed through the circuitry, now sending current in the opposite direction of the VCA's loops, pulling the VCA heads back towards the rare-earth magnet core. The cycle repeats, triggered by the incoming TTL signal.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 17| Part 5| August 2010| Pages 624-630
doi:10.1107/S0909049510025847
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