I see no updates in the log. Is the morning shift taking place?

For now I will stay at home and be on call. I can be at GSI in 20 min. Please let me know the status.

01575 8731537

HV cable was in wrong channel in power supply. Now it is back to the correct position. Checked connection at the PMT.

Occasionally, we noticed a spike in the PMT signal. No ions in the ring and at PMT Cu was not even supplied with HV. Has to be some electronic pickup

We shielded the PMTs, i.e., the N2 tube, which improved the Cu PMT background rate.

Without beam and ESR lights off:

PMT Mitte: 4 Hz
PMT Nord: 1 Hz
PMT Cu: 240 Hz

We changed the fiber to the wavemeter. The third fiber worked best and we could operate the WM at low exposure times, i.e., below the laser repetition rate. We used the neutral density filter to adapt the laser power that only one laser pulse is measured by the WM each time (Exposure time =34ms)

This way, there are no frequency jumps. The jitter is slighly different at each wavelength which was ~5GHz peak to peak.


We optimized the fiber coupler and slightly optimized the jitter to <4GHz.

The bunch HF is now fed through a delay to shift the stop trigger relative to the PMT signal. The delay generator is placed directly after the CFG and before splitting the signal for the two DAQs. The relative timing of both DAQs was not changed.

We changed the laser step size to 0.002 nm which corresponds to 5.75 GHz.

We used the counter to measure the lifetime. During the 30 min scan time dropped only slowly. 

During a longer break, e.g., when the laser flash lamps are changed, one could take data over a longer time.

It is planned to change the scan range of the laser wavelength from 322.41 - 322.0 nm to 322.01 - 321.6 nm @ 4 a.m. 

1. If the laser stabilization is still running, turn both stages off and block the main amplifier.
   
2. Ensure that the laser spot is centered on the paper screen, which is located in top of the laser tower in the south (ATTENTION: please only use the preamplifier and not the main amplifier!!! If you're unsure what you are doing please contact Rodolfo or Konstantin).
   
   
3. If this is not the case and the beam is completely off, have a look at the MRC Stabilization system. If it is running, close the software and turn the hardware off and on again. The spot will leave its position and come back after the stabilization is turned on again.
   
4. If it is still not centered, use and only use the piezo mirror (the one with red screws) to bring back the spot.
   
   
5. Remove the paper screen and then turn on the main amplifier.
   
   
6. Restart the software and put in the values from the file 07-04-2022(...).png. Start the two stabilization stages in the software. The laser spot should move back to the correct position.
   

> Attached you find a manual for the software used to control the movement of the XUV detector and the copper mirror detector. 
> The software is also used to set the electrode voltages and coil currents of the XUV detector. 

We tested the remote access to the raspberry pi as explained in the manual attached to the original entry of Volker. It was tested from
the linux machine LXG1050. Attached you can find a screenshot of the running program.