Alignment of the vertical position of the diffractometer dfy

• Best to work on Console 2 ( x10sa-cons-2 ), the computer on the left
• Check also the screenshots of the tools below

Step by Step

• Determine the current beam position
  • Move in the scintillator screen with the X10SA ONE panel
    • To open: Launcher for Experts > (Sections) End Station > (User Panels) ONE panel
  • Open the shutter with the ONE panel
    • Note that the shutter can only be opened if the beam stop is is "measure" position
    • fast way: in the DA+ GUI: goto SampleAlignment step and move out all "unwanted" devices as lamp, apertures,...
    • note that sometimes the scinti gets frozen over too fast to get a nice position, especially if you want to re-check with apertures and collimator
    • in this case, a brief switch-off of the cryo might help (do not forget to switch it on again as soon as possible)
  • In the DA+ GUI, (Expert mode) move the beam-position box to where the beam is
    • works only in BeamPosUpdate mode, and in max magnification !!
    • afterwards switch back to "SampleAlignment" mode !!
    • do not forget that step, else, the position will be lost at the next click of the mouse!
  • CLOSE the shutter !
  • Move out the scintillator
• Center an alignment needle to determine the rotation axis
  • Mount an alignment pin/needle on the goniometer
  • Be sure to find its correct center of rotation
  • NOTE: this will not necessarily be where you saw the beam above, so not in the center of the beam box
    • you can finely move the needle with the move buttons, set step to 1 um
  • Find the average of the needle position at 0 and 180 degrees
    • move needle there
  • Find the average of the needle position at 90 and 270 degrees
    • move needle there
  • Check full rotation - is this the center of rotation?
• Move the rotation axis (this is the needle position now) onto the beam position by re-setting the diffractometer y-position:
  • Launcher for Experts MX Common Tools DFY-Tool
  • Step the position of DFY until the center of rotation (needle head) and the beam position (red box) agree

Tools needed

• Launcher for Experts:
  
  
  
  

• X10SA ONE panel:
  

• K-Box expert panel:
  
  
• Beamline display panel:
  
  
• Clara Alignment GUI, Preferences:
  
  
  
  
• DFY-Tool:
  
  

• X10SA overview panel: