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Synchrotron/Neutron/Fusion » Neutron » VSANS Instrument for NIST (Very Small Angle Neutron Scattering)
VSANS Instrument for NIST (Very Small Angle Neutron Scattering)

 

ADC is designing and building a large instrument for National Institute of Standards And Technology (NIST). This instrument is similar to a more complex instrument we designed and delivered to Ansto in Australia called the Bilby SANS instrument.

 

The NIST VSANS and the Ansto Bilby SANS instruments have very similar dimensions for length and diameter and have similar requirements for internal detector motion, top access port, walkway supports, and ports; however, the Bilby SANS instrument was more complex because the vacuum requirement was lower (7.5x10-5 Torr) and the entire (60,000 pound) vessel was required to move 1.5 meters on external rails with a repeatability of 100 um, which ADC achieved.

 

A brief comparison of specifications is provided below.

 

NIST  VSANS and Ansto Bilby Spec Comparison

Specification

NIST VSANS

Ansto Bilby

Length

24,000 mm +/- 50 mm

20,020 mm -5, +36 mm

Internal Diameter

2300 mm

2300 mm

Vacuum

1 x 10-3 Torr

7.5 x 10 -5 Torr

Vessel Straightness

+/- 12 mm

+/- 10 mm

Leak Rate

.01 Torr/hr

1 x 10-7 mbar-l/sec

Carriage Load

800 Kg

2000 Kg

Carriage Travel

17,400 mm Max (Mid)

18,800 mm

Carriage Deviation

+/- 2 mm

+/- 1 mm

Vessel Adjustment Vertical

+/- 25 mm

+/- 10 mm

Vessel Adjustment  Lateral

+/- 25 mm

+/- 20 mm

Vessel Adjustment Axial

+/- 25 mm

1.5 meters (motorized)

Rail Adjustment Vertical

None

+/- 20 mm

Rail Adjustment Lateral

None

+/- 20 mm

Codes

ASME BPV Section VII

AS 1210

Material

Steel  517

Stainless Steel 304

Sections

3

3

Rear Hinge

Yes

Yes

O-Rings

Buna- N

Buna- N

Walkway Support

2000 lbs/tab

250 kg/m2

Manway Hatch

# TBD 66” Diameter

x1, 46 “ diameter

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