User Program - While at the Beamline - MEDM

EPICS Control

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

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