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CXI has two in-vacuum 2.3M CSPAD pixel-array detectors. Each detector is stationed downstream of one of CXI's three interaction points and can be read-out individually, together, or independently in independent data streams – allowing CXI the capability to operate two experiments simultaneously using a single X-Ray beam. When running two experiments during the same shift, the upstream experiment uses the DS1 CSPAD in the primary DAQ from cxi-daq, while the downstream parasitic experiment will use the DS2 CSPAD in the secondary DAQ from cxi-monitor. The names DS1 and DS2 refer to the vacuum chambers that contain the CSPAD detectors.
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First refer to the CSPAD and PGP troubleshooting guide and DAQ troubleshooting guide for detector related problems. These should sort things out or help narrow down the problem. If you're still stuck, consider the troubleshooting options below: