Argonne National Laboratory


User Program

Department of Energy Office of Science
GM/CA @ APS Sponsors:
National Institute of General Medical Sciences (NIGMS) and National Cancer Institute (NCI) of the National Institutes of Health (NIH)

User Program - While at the Beamline - MEDM

EPICS Control

Starting MEDM

MEDM is the EPICS interface for low-level control of beamline motors

MEDM is started by typing "23i" for ID-D or "23o" for ID-B in a terminal window.

The MEDM interface main menu will appear.

On the MOTION menu item select the desired device

Beam Alignment

  • Place the YAG crystal on the magnetic base vertically and in field of view of the High Resolution camera.
  • Visually align crosshairs in High Resolution camera by moving Beam delivery Horizontal and Vertical to move the camera support to bring the crosshairs to the image of the beam.
  • Remember hole in High Resolution camera will obscure the image at magnifications ~ 1.8 or less!

Goniometer Alignment

  • Center the alignment pin to establish rotation axis position High Resolution camera.
  • Move Goniometer Vertical to place the center of rotation at the crosshairs on the High Resolution camera.
  • Scan GS slits in V and H to center slits on beam
  • Attenuate and expose 0.1 second w/o sample to find any beam leak around beamstop
  • Adjust BS as needed to eliminate leak

    Content questions and comments: Craig Ogata

GM/CA @ APS is an Office of Science User Facility operated for the U.S. Department of Energy Office of Science by Argonne National Laboratory

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