Vacuum Beampipes in 7ID Hutches

The x-ray beam flightpaths in the 7ID hutches of MHATT/XOR can be evacuated with roughing pumps.  The pipes are 2" diameter aluminum or steel with KF50 flanges.  Analog vacuum gauges are installed at various points along the flightpaths to check that there are no leaks.  (Electronic gauges that can be incorporated into the beamline's EPS system are being developed.)  Windows at the ends of the flightpaths can be Kapton (R) foil (not Kapton tape) held with superglue (not epoxy) or Be on specialized flanges.  Some pipes have valves that can be used to bleed air into them once the pump is turned off; these are located right next to the pumps.


The entire length of the B hutch can be under vacuum.  There are several stages of offset adapter nipples on the upstream and downstream walls to adapt from large Conflat flanges to the KF50 flanges of the beampipe.  The offset flanges may need to be rotated to match the beam height in white-beam mode; the photos below are for monochromatic mode.
To protect the Be windows at the ends of the hutch against oxidation, they should always be hooked up to beampipes that are evacuated.  That is, remember to turn the pump on!  (Or, two pumps, if there are two sections of beampipe.)
The upstream end of the beampipe is under Configuration Control and cannot be adjusted without contacting a Floor Coordinator and obtaining the proper permissions.
When the entire length of the hutch is evacuated, a short KF50 bellows must be part of the flightpath (it's hard enough to find the right lengths of beampipe, and they usually don't quite line up perfectly).

One section of bellows


The 7ID-C hutch is not yet configured to support evacutated beampipes along its entire length.  So it must start with a window on a flange.  When the beam is being ported all the way into the D hutch, then the beampipe can butt up to the 6" Conflat flange on the wall and be attached using bulkhead clamps.

Onto wall with bulkhead clamps


The beampipe coming into the 7ID-D hutch attaches to the 6" Conflat-to-KF50 reducing flange attached to the upstream wall.  The short tee with the pressure gauge should be left in place.  Choose the appropriate length of beampipe and end it with a window flange.

Last updated January 9, 2006