We have been preparing to move the blue tube to it’s final position. The Velocity Selector is aligned, as is the neutron guide between Velocity Selector and Blue Tube. Vacuum is OK in both systems. We still have to build some shielding around them and the Velocity Selector still has to be fixed to the floor.
In July we’ve had some help from Oliver Frank adjusting the detector translation mechanism. It was a very stimulating visit and Oliver provided a lot of information on what is under the SANS-hood.
To access the blue tubes the tube sections can be moved along the axis of the setup. Due to space issues it will be very difficult to disconnect the cooling water when SANS is at its final position. We have therefore changed the cooling water in- and outlets so that spiralled tubing can be used.
Cooling water, old connections
Cooling water: new connections
The polariser and collimator tubes are mounted on the new support. There were some issues but overall the transfer went flawless. The cable ducts will be mounted soon. When the cables are reconnected and the neutron guides replaced we can start alignment.
The new parts for the blue collimator tube are finally here: ITEM tables, mounting material and steel beams.
Item sub-frame parts
The ‘Wechselbehalter’ junction boxes are installed and connected (one side).
We have mounted a new nose on the exit of the neutronguide that will be used for SANS. The new nose will protrude into the Velocity Selector shielding so that no extra shielding is needed. We have also incorporated an internal BN-diaphragm that will reduce the beamsize to 30x40mm.
Movements in the blue tube have been tested to see if they work properly. We need to change some connections so it seemed wise to check the current situation before that. Everything works fine. We have also connected the Velocity Selector (VS). It works, but more tests are necessary.
At the moment we are trying to solve a problem with the detector translation stage. It seems to skip some of the built in microswitches and therefore changes its current position along the way. On the next valid switchposition the current position is corrected and the cycle restarts.