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The reported position will be in PIXELS. That is not so useful! To convert to femtoseconds, we need to calibrate the TT.
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The timetool only gives you a small correction to the pump-probe delay. The "nominal" delay is set by the laser, which is phase locked to the x-rays. The timetool corrects for jitter around that nominal delay. So you should compute the final delay as: delay = nominal_delay + timetool_correction Since different people have different conventions about the sign that corresponds to "pump early" vs. "pump late" you must exercise caution that you are doing the right thing here. Ensure that things are what you think they are. If possible, figure this out before your experiment begins, or early in running, and write it down. Force everyone to use the same conventions. Especially if you are on night shift :). The "nominal delay" should be easily accessible as a PV. Unfortunately, it will vary hutch-to-hutch. Sorry. Ask your beamline scientist or PCDS PoC for help. |
How to get the results
Results can be accessed using the following epics-variables names:
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