The QIKR instrument is a reflectometer intended to primarily investigate liquid samples. Although solid samples may also be used, most samples will be liquids with a free surface that cannot be inclined relative to horizontal. To provide an incident angle for the neutron beam on these surfaces, the beam itself is inclined. QIKR has two separate neutron beam paths, QIKR-A and QIKR-B, that each operate as an independent beamline. QIKR-A is angled upward from horizontal by 2.5° and QIKR-B is angled downward from horizontal by 2.5°. QIKR-A and QIKR-B share a maintenance shield, which actuates to either allow neutrons to pass (operating position) or to block the guide and allow safe access to the bunker when the proton beam is off (maintenance position). Each beam path has its own end station. The end station is located downstream of the guide end and is intended to position both the sample and detector and to select one of the three beam components exiting the guide. Each beam path has its own shutter and beam attenuation mechanism. The shutter blocks the beam from entering the cave when users are present, and the attenuator allows the user to reduce the beam intensity by various amounts when needed for a given experiment. The attenuator must be placed in the beam prior to the sample, and the shutter must be placed in the beam prior to the cave. The last motion component for each beam path is a sample changer that will be able to position multiple samples in the beam without requiring the user to enter the cave.
This PDR will cover the all the motion components, but its focus will be on the end station systems since the maintenance shields and shutters are standardized designs that will be included in a Bunker Motion Systems PDR.
Charge Questions:
1) Have system requirements been defined, and are they complete and adequate to ensure acceptable system performance?
2) Can the proposed system designs meet their functional and performance requirements?
3) Are the cost estimate and acquisition strategy reasonable?
4) Are the proposed preliminary designs sufficiently mature to proceed to final design?
