Tilt correction after cooldown
Recover sample planarity once differential contraction has tilted the mount.
Opto-Mechanics · Cryogenic Piezo Stages - Goniometers
Goniometer25-theta
Cryogenic theta goniometer; 25 x 25 mm footprint; 6.6 deg tilt range; 41 mm pivot distance above plate; 200 g payload; resistive closed-loop feedback around 0.2-0.5 mdeg resolution.
Datasheet (PDF) ↗CAD Model (STEP) ↗Catalog context
Where Goniometer25-theta fits
Goniometer25-theta is listed in the Cryogenic Piezo Stages - Goniometers family. The local catalog record provides these first selection fields: Active axes: Rx; Footprint × hight: 25 x 25 x 12.5 mm; Mass: 28 g.
Specifications
| Active axes | Rx |
|---|---|
| Footprint × hight | 25 x 25 x 12.5 mm |
| Mass | 28 g |
| Work environment | Default:1.4 K~ 400 K, 1e-7 mbar, 35 Tesla |
| Mainbody | Default: Pure Ti |
| Wires | Phosphor Bronze Twisted Paired Wires, 20cm |
| Pin materials | Polyster (glass fiber filled), BeCu |
| Pins number | Drive -2 pins, Sensor- 3 pins |
| Fine Tune Resolution @2 K* | 0.5 u° |
| Step Size (min) @300 K* | 50 u° |
| Travel range | ~6.6 ° |
| Max. Velocity @300 K | ~1°/s |
| Max. Load | 200 g |
| Dynamic Force | 2.2 N |
| Rotation center to top plate | 41 mm |
| Sensor | Resistive Sensor |
| Sensor range | 6.6 ° |
| Sensor resolution | 0.2 m° |
Application context
Why this design is used
Dual-axis tip/tilt
Stack theta and phi units to steer around a common virtual pivot above the top plate.
Incidence angle in confined geometry
Set beam incidence inside a cryostat where there is no room to move the optics instead.
System integration
Integration and compatibility
Use these checks to connect Goniometer25-theta to the surrounding optical, mechanical and control system. Every value shown is taken from this model's own specification record.
- Travel and resolution
- Fine Tune Resolution @2 K*: 0.5 u° · Step Size (min) @300 K*: 50 u°
- Separate travel from resolution and both from repeatability. Repeatability is what an automated sequence actually depends on, and it is the figure most often absent from a headline specification.
- Load and mounting
- Max. Load: 200 g
- Check the load rating in the orientation you will use it — a vertical or cantilevered load is a moment, not a mass — and match the base to an M6 pattern on a 25 mm grid or a 1/4"-20 pattern on a 1 inch grid.
Technical FAQ
Integration questions for Goniometer25-theta
What travel and resolution does the Goniometer25-theta provide?
Fine Tune Resolution @2 K*: 0.5 u° · Step Size (min) @300 K*: 50 u°. Separate travel from resolution and both from repeatability. Repeatability is what an automated sequence actually depends on, and it is the figure most often absent from a headline specification.
What load can the Goniometer25-theta carry, and how does it mount?
Max. Load: 200 g. Check the load rating in the orientation you will use it — a vertical or cantilevered load is a moment, not a mass — and match the base to an M6 pattern on a 25 mm grid or a 1/4"-20 pattern on a 1 inch grid.
Specifying this part
What this model has to survive, and what it needs around it
Fixed pivot above the top plate
Each unit tilts about a centre that sits a fixed height above its own mounting surface — 41 to 66 mm depending on model. Stacking a theta and a phi unit gives dual-axis tip/tilt about one shared virtual pivot, which is why they are specified in matched pairs.
Heat load at the cold plate
Stick-slip inertial drives dissipate energy per step and draw no holding current once stopped, so the steady-state load on the mixing chamber is the wiring loom rather than the motor. Anchor the loom at each temperature stage and thermalise the moving body with an FTC copper braid.
Non-magnetic construction
Titanium bodies (BeCu on the .ULT variants) and BeCu fasteners throughout, rated for operation to 35 T and down to 30 mK with the .ULT option, at 2 × 10⁻¹¹ mbar with .UHV. A single steel screw substituted at installation is enough to compromise a high-field assembly.
Full series comparison, controller pairing and mounting hardware on the cryogenic piezo stages overview, or work through the selection with the configurator.
Model selection
Nearby series comparison
Compare Goniometer25-theta with the closest available models in the Cryogenic Piezo Stages - Goniometers family.
| Selection parameter | Goniometer25-theta (current) | Goniometer25-phi | Goniometer35-phi |
|---|---|---|---|
| Travel / adjustment | ~6.6 ° | ~6 ° | ~10 ° |
| Resolution / sensitivity | 0.5 u° | 0.5 u° | 0.5 u° |
Related products
Goniometer25-phi
Cryogenic phi goniometer; 25 x 25 mm footprint; 6.0 deg tilt range; 53.5 mm pivot distance above plate; 200 g payload; resistive closed-loop feedback around 0.2-0.5 mdeg resolution.
Goniometer35-theta
Cryogenic theta goniometer; 35 x 35 mm footprint; 12.0 deg tilt range; 50 mm pivot distance above plate; 500 g payload; resistive closed-loop feedback around 0.2-0.5 mdeg resolution.
Goniometer35-phi
Cryogenic phi goniometer; 35 x 35 mm footprint; 10.0 deg tilt range; 66 mm pivot distance above plate; 500 g payload; resistive closed-loop feedback around 0.2-0.5 mdeg resolution.
