Mini-Kappa Goniometer Head

This video presents the Mini-Kappa Goniometer head mounted on a MD2-S microdiffractometer.
The Mini-Kappa is dedicated to MX crystallography synchrotron beamlines. It purveys additional Kappa & Phi axes, giving numerous possibilities of crystal reorientation.

The multi-axis goniometer head for MX crystallography

The Mini-Kappa MK3 is a multi-axis goniometer head with reduced dimensions that purveys additional κ & Φ axes, giving numerous possibilities of crystal reorientation.

It reaches a rotational precision of ±0.05° for κ axis & ±0.09° for Φ axis and can be equipped with the SmartMagnet sample holder.

Mounted on a MD3 High Precision X-ray diffractometer, the Sphere of Confusion (SOC) that is achieved on the Ω axis is <1 µm (measured with a Mini-Kappa in maximal opening position – 180 deg – @ 90 deg/s)

Data Collection optimization

The mini-kappa MK3 considerably optimizes the data collection process by reducing the redundant protocol steps: it limits the number of diffractions needed to complete the data collection and avoids spot overlaps.

Sample Protection

Thanks to the additional kappa & Phi axes rotation, X-ray diffraction isn’t limited to one “crystal frame” but is realized on the entire crystal: the diffraction is more distributed over the crystal, limiting radiation damage.

Compact dimensions

Needed Volume that includes the Mini-kappa MK3 and the free space required for kappa movements is contained in a cylindrical volume with exceptional compact dimension of 120 mm length and 131 mm diameter.

Collision Safe System

The Mini-kappa MK3 is able to detect potential risk of collision with equipment, such as a robotic arm (e.g. Staubli robot). If an obstacle is on the path of the kappa movement, the integrated detector initiates the “Omega Stop” safety sequence: the kappa movement is stopped and information is conveyed to the beamline terminal.

Excellent compatibility

The Mini-kappa MK3 can be mounted on Arinax diffractometers, such as the MD3 & MD2-S x-ray microdiffractometers. The Mini-Kappa can also be compatible with other equipment.

Designed for modern MX crystallography beamlines, the Mini-kappa MK3 is compatible with sample changer robot using a vial or a gripper transfer, such as the 6-axis sample changer robots.

5 minutes Switchable Equipment

In order to give the best flexibility to users, the Mini-kappa MK3, the Plate manipulator and the SmartMagnet are designed to be easily mounted and dismounted according to user need: the switch from one to another takes about 5 minutes and only one person is required to do the switch.

Technical specifications

Sphere of Confusion
Measured on MD3 Ω axis
(Mini-Kappa in open position)
K Kappa axis
Angular range
– Travel range
– Resolution
0 to 255°
0.35 mdeg
Rotational precision ±0.05°
Φ Phi axis
Angular range
– Travel range
– Resolution
360° (no limit)
1.41 mdeg
Rotational precision ±0.09°
X Chi axis
Angular Range/Travel range 0 to 48°. Kappa-axis position dependent.
Sample pin requirement
International Standard “SPINE” 22 mm length
Stepper motors
Mini-kappa head
(included needed volume for kappa movement)
120 mm & 131 mm (L, D)