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Both DS1 and DS2 have companion mobile equipment racks – D50 and D51 respectively. The racks are nearly identical and each contain power supplies and readout electronics for detectors, a Digi, a 4-channel stepper motor controller, an EPICS IOC server, and (whatever else). A chamber's mobile rack will The mobile racks handle controls and feedback for detector power and diagnostics monitoring, stepper motor control, and serve as an interface for detector data and timing input/output.
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