This double crystal monochromator is a new concept developed by PSL.
It uses a straight edge ("broomstick") mechanism to generate the cotangent
function necessary, and a true half angle mechanism to maintain parallelism
and rotate the crystals to the proper Bragg angles. The first of this type
of monochromator was completed and delivered in March of 1996.
Features
Bragg angle:
8° - 80°
Beam offset:
50 mm up or down
Crystal size:
60 mm long x 100 mm wide x 3 mm thick (Can accommodate up to 25 mm thick)
Cooling capacity (via liquid cooled substrate):
300 Watts
Crystal adjustment:
while under vacuum
UHV construction:
10-10 Torr
Bakeable to:
150° C (except PZT with
125° C rating)
Only one linear motion feedthrough required to operate entire
scan mechanism.
![[photo of Broomstick DCM mechanism]](../images/broom.gif)
This double crystal monochromator is a new concept developed by PSL.
It uses a straight edge ("broomstick") mechanism to generate the cotangent
function necessary, and a true half angle mechanism to maintain parallelism
and rotate the crystals to the proper Bragg angles. The first of this type
of monochromator was completed and delivered in March of 1996.