The status of the XTD2 attenuators has been checked during the experiment last week and many were found to cause disturbances in the wavefront ranging from mild to severe.
Attachment 1: No attenuator Attachment 2: 75 um CVD - Fringes visible in beam Attachment 3: 150 um CVD - Strong fringes in beam Attachment 4: 300 um CVD - Looks more or less ok Attachment 5: 600 um CVD - Weak distortion in the beam profile Attachment 6: 1200 um CVD - Ok Attachment 7: 2400 um CVD - Ok Attachment 8: 500 um Si - Not ok