Scanning Probe Diffraction Quick Reference: Difference between revisions
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Prior to this section it's expected that sample alignment has been performed ([[Sample Alignment Quick Reference]]) | Prior to this section it's expected that sample alignment has been performed ([[Sample Alignment Quick Reference]]) | ||
===Verify optic alignment===<br /> | |||
Perform [[CCD changeover]] to [[Coolsnap]] <br /> | Perform [[CCD changeover]] to [[Coolsnap]] <br /> | ||
Drive focusing optic into beam, adjust OSAX and OSAY so outgoing focused beam is not clipped and remnant central parallel beam intensity is minimized<br /> | Drive focusing optic into beam, adjust OSAX and OSAY so outgoing focused beam is not clipped and remnant central parallel beam intensity is minimized<br /> | ||
Revision as of 14:28, September 9, 2010
Back to Diffraction
Prior to this section it's expected that sample alignment has been performed (Sample Alignment Quick Reference)
===Verify optic alignment===
Perform CCD changeover to Coolsnap
Drive focusing optic into beam, adjust OSAX and OSAY so outgoing focused beam is not clipped and remnant central parallel beam intensity is minimized
Close NES slits to 0.1x0.1, adjust FOMX and FOMY to center optic on beam axis - outgoing wavefront as clipped by slits should look symmetric around the edges
Record this as your "optic in" position, move FOMX so parallel beam is unobstructed with NES slits at 1x1 (should be ~+4000 relative move) - record this as your "parallel beam" position
NOTES:
i) Central stop may be offset from the center of optic - do not simply put image of central stop in the center of the beam footprint when aligning optic