About ADC
video introduction
~2.50 min. long
ISO Cert
Synchrotron/Neutron/Fusion » Synchrotron » High Precision Slits » Neutron Slits » NIST “curtain style” XY Vacuum Slit
NIST “curtain style” XY Vacuum Slit

The NIST Neutron Beam Slit is a “curtain style” XY Slit.  This slit uses a single NEMA 17 motor on each axis coupled to a screw with both right and left hand threads to move two blades simultaneously to open and close the aperture.  The blades are mounted on preloaded carriages that are guided by miniature ball guide rails.  The blades are made from Cadmium, Boron-aluminum, and Lithium Polymer.  The blades can go from a 2mm overlap to a maximum aperture size of 60mm x 140mm.  A Renishaw Tonic Linear Encoder is used to track the position of the blades.  The limits are lever style snap-action switches.  Connectors will be black AMP CPC type as specified by the customer. This slit has been designed for use in a rough vacuum environment.


ADC has developed the most complete set of high-precision slits for Neutron applications. 


  • Micron precision
  • High radiation resistance components such as motors, brake, and encoders
  • Blade material;
    • Cadmium, Boron Nitride, Boron Carbide and/or composite structure consisting of several materials,
  • Blades can go "past closed" without clashing (Overlapping/Zero beam).
  • Standard sizes:
    • (10 mm X 10 mm aperture)
    • (25 mm X 25 mm aperture)
    • (60 mm X 60 mm aperture)
    • (100 mm X 100 mm aperture)
    • (150 mm X 150 mm aperture)
  • Customized to Customer Specifications; size, blade material, etc.
  • Air or Vacuum


All of these slits use standard micro stepped stepper motors that could be controlled with a wide array of controllers/drivers available on the market.  We now do 100% inspection on all our slits blades being sold.  For a copy of the report please contact ADC.