• The laserscan tab shows each observable plotted against the predefined wavelength setpoints now.
  
  
• The Kobra set wavelength shows the actual setpoints now and not measured wavelengths.
  

We changed the LV code so that the Cobra Set Wavelength is permanently sent. Before it was only sent once at the beginning of each laser step. This, however, lead to too much data for the LV->MBS server.
This was fixed by inserting a 250 ms wait in LV (in Krypton data VI). Basically, all LV values are now updated every 250 ms, which works fine with MBS

Problem solved. Ignore this entry








If the wavemeter reading is not shown correctly in Go4 - Step2 - Labview:

Close Labview, close WM software (all windows)

Start WM software, start Labview, restart MBS

I just performed a backup of all data (+log-Files) that were collected until now to the two RAID HDDs.

For DAQ1: /media/sdc2 - last file 229Thor7889.lmd. Please note, that the naming sceme on DAQ1 is inconsistent - please look for the filenumnbering
For DAQ2: /media/sdd2 - last file 229Th0153.lmd

PTB HV dividers arrived. Divider ratios are:

PT120:          12003,341 
PT200.1:        19859,033 
Ohmlabs:        248517

We noticed a difference in the electron cooler high voltage:

The set voltage is ~205 kV, the Ohmlabs divider measures 207 kV and the PTB200 shows a value of ~212 kV. The latter is doing some crazy jumps of up to 10 kV, see screenshot. The Ohmlabs divider is stable

Maybe some small discharges? 

We checked the strange behavior of the HV dividers again. The Ohmlabs and the PTB divider are in good agreement at 120 kV and 150 kV. There, both dividers deviated by 0.35% from the value on the HKR multimeter. Ohmlabs divider yields higher voltage.

At higher voltages (180 kV, 195 kV and 205 kV) the PTB divider showed jumps. The deviation between Ohmlabs divider and set value increased at higher voltages up to 2 %.  Ohmlabs divider was fluctuating at 10 V scale but center was stable.

We removed the PTB divider.

Afterwards, the fluctuation of the Ohmlabs divider are at the 1 V level. Deviation between Ohmlabs divider and set value is now 0.35 % at 205 kV. Same as in the low voltage range with the well-working PTB divider.

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.