The AT-C8-HV was developed for scientists at the APS who needed to get a high precision slit into the immediate proximity of the sample, while still maintaining vacuum and visibility to several backscattering detectors.

The result is this extremely compact AT-slit with a centered opening.

The slit system holds four in-vacuum motors that set the position and the opening of the aperture. For each dimension, one motor defines the aperture opening, and another determines the position of the aperture. Because only one motor moves during a one-dimensional scan, the AT-C8-HV is the optimum choice for high precision scans with a fixed aperture.

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Technical specifications

Aperture size
Maximum: 8 mm x 8 mm
Minimum: Full overlap

Aperture: 1.016 microns per full step
Translation: 0.508 microns per full step

O-ring sealed, high vacuum 10-5 mbar, low outgassing materials

Standard blades
2 mm thick tungsten carbide blades with a 2 degrees knife-edge profile

Limit switches (end-of-travel)
Included as standard on all motions

High precision internal rails and carriages

Electrical connections
Limit switches coupled to 2 motor connectors (SUB-D 15 pins male)

2-phase stepping motors

Mechanical dimensions
80 mm x 80 mm x 52 mm (housing only)
95 mm x 80 mm x 56 mm (including connector houses)

Mechanical connections
M3-threaded holes on the sides, as shown on the drawing, and KF-25 flange connections on the body of both sides of the slit

≈ 1.0 kg

Outer surface
Anodized aluminum in color nature

Common options
Blades: Other blade shapes and materials
Adaptors: KF40 or CF40 flange connections
Special preparation for enabling vacuum <10-6 mbar
Internal wiring with Teflon insulation