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A detailed description of the level of support from the Device physicist and the Beam physicist can be found in the A1900 service level description and S800 service level description documents.
In the absence of a S800 device physicist, please follow the official procedure for handing over the beam from the operators/beam physicists to the experimenters and vice versa: https://intra.nscl.msu.edu/ccf/infoexperimenters/handingoverbeam.php.
In case a S800 person needs to be contacted after-hours, please keep in mind that this has to be done by the Operator in Charge. In general, the operator routes requests from experimenters for after-hours laboratory resources to appropriate lab personnel (see https://intra.nscl.msu.edu/ccf/infoexperimenters/operators.php for more information).