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 | |
|---|---|
| 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 |
|---|---|
|
|
The plots show that already an automated p feedback is superior to a person adjusting laser target time by hand to keep timing stable