Visible light microscope (VLM) setup
For details on how to operate the VLM and display the image on the computer screen, refer to Sec.
2.3. In short:
- Insert the sample stage without a sample in place.
Bring the snout into the operating position (micrometer reading 15.00
mm for inboard STXM, 27.0 mm for outboard STXM).
Move the VLM by moving XDET, YDET and ZDET
to be in focus on the exit window of the snout, with the snout
approximately centered on the window (see Fig. 12.1). To do this you might
need to move the sample stage a little bit further upstream (so as to
be able to move far enough upstream with the VLM).
- Mark the position of the exit window on the computer screen
with a permanent marker (can be removed with ethanol).
Remember to align the field of view to the lower right corner of the Desktop before doing
- Record the detector stage position for and . This gives
you the reference VLM position for it being on the beam axis.
Enter them into the alignment file
/mnt/x1a/alignment_stxm[i,o].dat. They are the
parameters vlm_[x,y]det_um. This establishes
the and position of the VLM, for which it is on the beam
- You may also preliminarily set up a detector stage position for . For this move the
VLM a few mm downstream of where the exit snout is in focus (this is the position, where the
zone plate would about in focus) read the ZDET position and enter it into the
alignment file as vlm_zp_zdet_um.
The exit window as viewed by the VLM.