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Title: High energy resolution, high angular acceptance crystal monochromator

A 4-bounce dispersive crystal monochromator reduces the bandpass of synchrotron radiation to a 10-50 meV range without sacrificing angular acceptance. The monochromator includes the combination of an asymmetrical channel-cut single crystal of lower order reflection and a symmetrical channel-cut single crystal of higher order reflection in a nested geometric configuration. In the disclosed embodiment, a highly asymmetrically cut (.alpha.=20) outer silicon crystal (4 2 2) with low order reflection is combined with a symmetrically cut inner silicon crystal (10 6 4) with high order reflection to condition a hard x-ray component (5-30 keV) of synchrotron radiation down to the .mu.eV-neV level. Each of the crystals is coupled to the combination of a positioning inchworm and angle encoder via a respective rotation stage for accurate relative positioning of the crystals and precise energy tuning of the monochromator.
Inventors:
 [1];  [2];  [3]
  1. (Bolingbrook, IL)
  2. (Westmont, IL)
  3. (Green Bay, WI)
Issue Date:
OSTI Identifier:
870448
Assignee:
United States of America as represented by United States (Washington, DC) ANL
Patent Number(s):
US 5524040
Application Number:
08/169,656
Contract Number:
W-31109-ENG-38
Research Org:
Argonne National Laboratory (ANL), Argonne, IL
Country of Publication:
United States
Language:
English
Subject:
energy; resolution; angular; acceptance; crystal; monochromator; 4-bounce; dispersive; reduces; bandpass; synchrotron; radiation; 10-50; mev; range; sacrificing; combination; asymmetrical; channel-cut; single; reflection; symmetrical; nested; geometric; configuration; disclosed; embodiment; highly; asymmetrically; cut; alpha; 20; outer; silicon; combined; symmetrically; inner; 10; condition; hard; x-ray; component; 5-30; kev; ev-nev; level; crystals; coupled; positioning; inchworm; angle; encoder; via; respective; rotation; stage; accurate; relative; precise; tuning; silicon crystal; relative position; energy resolution; single crystal; synchrotron radiation; relative positioning; angular acceptance; mev range; crystal monochromator; angle encoder; /378/

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