Beamline 8-ID-E operates with a single-bounce monochromator, and therefore at fixed operating energy.
Since June 2016, all experiments on 8-ID-G (Grazing Incidence instrument) have operated at 10.9 keV provided by the Si(111) crystal.
Since June 2016, all experiments on 8-ID-E (WA-XPCS instrument) have operated at 7.35 keV provided by the Si(220) crystal.
Prior to June 2016, the Grazing Incidence instrument on 8-ID-G was setup at a different angle and operated at 7.35 keV, provided by the Si(111) crystal.
For information on the Reflectivity curves of the monochromator crystals, see entry 653/mirror 653
P.S. 10/30/2019
On Oct 21, I took a picture of the monochromator for operation of Si (220) at 7.35 keV.
Note the painting tape with the Si (220) marks. This was prior to aligning the beam on 10/22 but should be close.
I took this picture as a reference in case we loose the motor position.
I am amazed how well this monochromator has worked frankly since 2014 but you never know.
ED |