A new UHV angle encoder for high-resolution synchrotron radiation monochromators.
The high precision of 0.1 arcsec required for the positioning of optical elements in new two-axes monochromators at the undulator beamlines at BESSY II has led to the development of UHV-compatible high-precision angle encoders. Mounted directly on the rotation axes, they provide substantial advantages over measuring systems connected outside the vacuum vessel. Making use of a fast closed-loop control system, an accuracy of 0.1 arcsec at a resolution of less than 0.01 arcsec has been experimentally verified.
Senf
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F
BESSY GmbH, Lentzeallee 100, D-14195 Berlin, Germany.
Lammert
H
H
Follath
R
R
Zeschke
T
T
Gudat
W
W
Feichtinger
K
K
Fischer
P
P
Hübner
W
W
Strobel
R
R