a. “Pink” beam (i.e. x-raynbow, lots of wavelengths)
b. Wide bandwidth relaxes the Bragg condition so that many reflections light up.
c. Large area detector measures where these peaks show up.
d. Analyzing which reflections light up when the beam is at a given position tells us the orientation of a crystal at that location.
e. By scanning the beam across a region of the sample, we can get an orientation map for that region.
a. Place the beam on a selected crystal with a known orientation.
b. The orientation lets you calculate the location (and corresponding motor positions) of Bragg peaks for a given beam energy.
c. Orient the crystal and coherent detector to measure the Bragg peak.
d. Rotate the crystal approximately $\pm\frac{1}{2}$ a degree from the Bragg condition over the course of 100-200 steps, imaging the diffraction pattern at each step.