RECOVERY FROM A POWERCUT
- Check that all ION PUMPS are up and running. You might have to open the beamline racks.
- In have to reset the correct values in the Heidenheim encoders. The detailed instructions to do this follow below.
CASE I: the energy of the monochromator is known.
The position of the monochromator encoders can be retreived from the data acquisition computer, opening the last beamline.txt file.
CASE II: the energy of the monochromator is NOT known.
In this case, you have to move the mirror (first) and the grating (second) in order to reach the limit switch. Don't move the grating first, otherwise you may crash the monochromator optics.
Move the monochromator mirror to the limit switch in positive steps of 64000 units. It take about 450000 steps to reach it. At this position the Heidenheim MUST read 46.6312 mm. Set this value manually on the display unit in the rack close to the beamline.
Move the monochromator grating to the limit switch in positive steps of 64000 units. It take about 400000 steps to reach it. At this position the Heidenheim MUST read 40.1818 mm. Set this value manually on the display unit in the rack close to the beamliine.
Go back the original position of the monochromator by moving the grating first and then the mirror
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