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Synchrotron/Neutron/Fusion » Neutron » Small-Angle Neutron Scattering (SANS) Instrument
Small-Angle Neutron Scattering (SANS) Instrument


The Time-of-Flight Small Angle Neutron Scattering (ToF SANS) instrument is being built at reactor source, at ANSTO, Australia. SANS is complex machine. One of key parts of it is large detector vessel. ADC has taken the overall concept for the vessel developed by ANSTO designers, and provided final engineering design and then built the detector vessel as imaged below. This consists of a very large vacuum vessel with an internal track for accurately moving a detector up to 18.8 meters. In addition the entire vessel can be accurately moved 1.5 meters using external rails and a ball screw. The front end consists of a sample window and 630 mm gate valve. The rear of the vessel has a hatch with an articulated hinge. There is a central man-way hatch on the top and 17 ports for vacuum pumps, electrical, feed throughs, and sensors. The vessel was designed in compliance with ASME BPVC, Section VIII, Division 1, 2011 Revision, with exceptions for good vacuum practice and approved by the Australian Work Cover Authority.


1)      Vacuum                                 7.5 x 10 -5 TORR, Leak Rate = 1 x 10-7 mbar-l/sec

2)      Vessel Inner Diameter               2300 mm

3)      Internal Diameter Tolerance       0 to + 10 mm              

4)      Vessel Length                         20200 mm (65.7 feet ) with the ends closed

5)      Vessel Straightness                  Front to Back, +/- 10 mm

6)      Number of Sections                  3 Sections

7)      Shell Wall Thickness                 9.5 mm (3/8 inch)

8)      Material                                 304 stainless

9)      O-Ring Seal                            Sections, Front, Rear, and Top Hatches

10)   O-Ring Material                         Viton

11)   Rear Hatch                               Full Diameter with Articulated Hinge      

12)   Internal Carriage Capacity          1000 kg                                                

13)   Quick release latches                 Top and Rear Hatch

14)   Internal Travel                          18,800 mm (61.7 feet)

15)   Internal Drive                            Rack and Pinion                               

16)   Internal Velocity                        4 m/min

17)   External Travel                          1500 mm (59 inches)

18)   External Drive                            Ball Screw


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