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This enables the PID loop for the coarse oscillator cavity frequency control. It will say either "Automatic" or "Manual". When set to "Automatic" software will enable and disable "PID Mode" below it to keep the Piezo Amp Monitor at ~2V.

Troubleshooting

The "Target Time" doesn't work or energy jitter is higher than expected.

Increased energy jitter is a symptom of the timing system not working correctly. Please see the troubleshooting section for the timing system in S20 for how to troubleshoot.

https://confluence.slac.stanford.edu/display/FACET/Adjusting+Laser-Electron+Beam+Timing