On the 1st of May 2024 we used the EOS timing information as input into a P-feedback loop to stabilize the E-320 interaction.
The feedback used the following parameters:
EOS only P feedback parameters | |
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EOS calibration | 20 fs/px |
Analysis method | Projection and find maximum of projection via max() function |
Feedback on PV: | OSC:LA20:10:FS_TGT_TIME |
Averaging over number of shots | 10 |
Performance during laser energy scans:
Top plot shows the TOA as measured by the EOS, bottom plot shows the set target time subtracted by t0=1255.243,
bottom plot shows laser energy set point.
Goosed shots were taken out of the plot.
The algorithm could identify the EOS signal location from 10 % to 100 % laser energy and wasn't thrown off
by the goose trigger. Below 10 % energy, the feedback stalled.
Automated versus manual feedback
automated feedback | Manual feedback |
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The plots show that already an automated p feedback is superior to a person adjusting laser target time by hand to keep timing stable