achievements:

• knife edge scans of OL to find lens position corresponding to the smallest beam size
• knife edge scans of FEL to determine the position to proceed for spatial overlap
• liquid jet was set up and it's running since afternoon
• measured x-ray absortion via the diode in the CHEM-DIAG

problems:

• difficult to perform knife edge using 3 um after finding rough spatial overlap useing the green laser. The issue is the following: becasue the diode does not see the direct OL beam but rather we see scattered light at the diode, even when the direct beam is blocked by the sample holder
• since spatial ovelap cannot be found we siwtch program
• APD voltage device goes into error above 310 V and at 310 V after some minutes it goes also into error ->
• the APD signal shows strong fluctations in the background