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Beam instability

The XFEL users have experienced a problem with the beam stability when moving dcm_ener. 


Above you can see how even after normalizing to i0 there is large jump in the intensity. 

This matches with the changes in the beam position monitor.  The strange thing is that this instability last for 15seconds and then we are back to normal. The problem does not appear when scanning only dcm_bragg.

Scroll pump from P09

I borrowed an Edwards scroll pump from David at P09. We should try to return it on the 18th of October.

  1. By accident I destroyed one of the steppers of the Absorber Wheel (at the moment on the desk in L014)
    New motor is ordered
  2. the beamline laptop is in EH3 - Georg borrowed it.

    best
    Frank-Uwe (back at 8th of Oct)
BPM in EH1

Turned out that the diamond window of the BPM in EH1 was completely gone/broken and therefore it did not work. Boris will replace and bring a new one to the beamline on the 10th of September (Monday)

I turned off the mobile turbo station for the HRM. A strange burning smell was coming from the scroll pump. Should be checked. Also vacuum in tank only 2.5x10-5mbar. Did not get worse after the pump was stopped.


source: http://www-mkk.desy.de/cgi-bin/Oracle/ChannelArchiver/ArchiveRecs.pl?group=M3&Submit=Submit

(at the website: select an item, scroll down, plot)


To enlarge: STRG + Mouse Scrollwheel