1. Select "Scaler" from the horizontal toolbar at the top of the screen. This opens the pie chart in the high right corner of the screen showing the intensities measured in the first and second ion chambers in the hutch (Ion1 and Ion2)
2. Select "Mostab" from the horizontal toolbar at the top of the screen. Put Mostab in manual mode as shown in the low right corner of the screen. This puts the feedback system in stand by mode.
3. Select "Motor Tool" from the horizontal toolbar at the top of the screen. You can have maximum 6 motor windows opened at the same time.
4. From the "Motors" drop down menus in the first and the second windows choose "Monochromator user – KeV(Only)" and "Monochromator user – KeV(Slide)"
5. Select the "Go" tab in the "Monochromator user – KeV(Slide)"
6. Enter the energy you want (mid-point of EXAFS scan) and hit "Go". The fields with the desired energy will change to yellow during the move.
7. Wait until both the goniometer (KeV (Only)) and the second crystal slide (KeV(Slide)) have reached the desired energy. The fields with the energy will change back to white.
8. Open a third motor window. From the "Motors" drop down menu choose "Monochromator user – mono-theta". Select the "Tweak" tab. Tweak the "mono-theta" motor in 10-step units to maximize the intensity measured in Ion1. DO NOT change "mono-chi" without talking to beamline support staff.
9. Go to the end of the EXAFS scan using the "KeV-only" motor.
10. Put the Mostab in "Peak Hold" or "Peak Search & Track SetPoint" mode. The latter is strongly recommended for energies below the Fe edge (7.KeV) with SetPoint from +-0.75 to +-0.9 (the white field currently set at +0.85 on the screen.). This puts the feedback system in active mode. Then use the "KeV-only" motor to go to the start of the EXAFS scan. The Mostab should keep the Ion1 intensity constant at the requested fraction of the maximum intensity at the peak of the rocking curve.
11. If the reading on Ion1 is out of the 10-50% range use the "Current Amplifier Tool" (under the Scaler pie chart on the screen) to increase or decrease the sensitivity.
12. If your sample is smaller than the beam ( 0.8mm x 1mm if fully focused at the sample position) tweak or scan the 4 "Endstation Slits" motors ( "Top" and "Bottom" shown on the screen) to reduce the beam size.