Removal of the Mirror-Filter tanks from 7ID-A
The mirror-filter tanks in 7ID-A have been empty for some time, pending
a redesign of the mirror-filter assembly. The vacuum inside them
has not been very good. The Be windows which protect other
portions of the beamline from the MF vacuum are thick and of relatively
poor quality. Therefore, the empty tanks and the Be windows were
replaced on May 20-21, 2004 by Don Walko and Harold Gibson, with simple
straight sections and reducing Tee's. The small ion pumps were
mounted on the Tee's so they could help pump on the long straight
sections.
Dismantling of MF 1 tank
The Be windows had bad spots on the sides which faced the mirror
filter tanks
Removal of the two Be windows, which are each 254 um thick, will
increase the x-ray flux: the calculated increase is about 15% at 7 keV
and 5% at 10 keV. But more importantly, removing these old,
low-quality (and obviously corroded) windows will improve the coherence
of the beam.
The installed flight paths
Don Walko, MHATT-CAT, XOR, APS, ANL
Last updated May 21, 2004
