A capacitance-based micropositioning system for x-ray rocking curve measurements.
Certain types of x-ray experiments require very precise angular positioning of crystals in the vicinity of the Bragg reflection condition. A system applicable to some measurement of this type is described which achieves a long-term angular stability of approximately 10(-7) radians, coupled with a linear angular readout. This is achieved through a novel capacitance sensing system which provides angle measurement, together with the use of an auxilliary servo loop based on the Bragg condition to ensure long-term overall angular stability.
Miller
G L
GL
Bell Laboratories, Murray Hill, New Jersey 07974, USA.
Boie
R A
RA
Cowan
P L
PL
Golovchenko
J A
JA
Kerr
R W
RW
Robinson
D A
DA