Misalignment sensitivity of an inclined crystal monochromator

Conference · Tue Oct 01 04:00:00 EDT 1991

DOI:https://doi.org/10.1016/0168-9002(92)90547-H· OSTI ID:10107899

Macrander, A T; Lee, W K

The sensitivity of a novel inclined crystal monochromator design to misalignments has been calculated, and compared to data. Rocking curve line narrowing as well as broadening can occur because the asymmetry factor of dynamical diffraction given by b=s{sub O}{center_dot}n/s{sub H}{center_dot}n can have an absolute value larger or smaller than unity. Here s{sub O}{center_dot}n and s{sub H}{center_dot}n are the direction cosines of the incident and diffracted beams, respectively, and n is the inward surface normal. An inclined double crystal monochromator which is perfectly aligned would have b = {minus}1 for both crystals, and only then would the diffraction by symmetric. We have computed b and rocking curve widths for inclination angles of 70.53{degree} and 85.00{degree}, and we compare the 70.53{degree} case to data for silicon {l_brace}111{r_brace} reflections using 8 KeV (CuK{alpha}{sub 1}) radiation. The 70.53{degree} case applies to (11{bar 1}) reflection from a (111) oriented crystal. We report that rotations around the reciprocal lattice vector have the expected effect on b.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 10107899
• Report Number(s): ANL/CP--74079; CONF-9110146--3; ON: DE92004130
• Country of Publication: United States
• Language: English

Related Subjects

440800
47 OTHER INSTRUMENTATION
ALIGNMENT
CRYSTALS
DIFFRACTION
MISCELLANEOUS INSTRUMENTATION
MONOCHROMATORS
SENSITIVITY