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