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![[Figure 6]](gin5002fig6mag.jpg)
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Figure 6
(a) Arinax mini-κ goniostat at maximum extension (κ = 180°), as used at the ESRF ID30B beamline (White et al., 2018  ). The detector is at the left of the picture. χ is the angle between the ω and φ axes. It can be seen that for short detector distances and high χ angles the φ-axis mounting may block some of the reflections passing from the diffracting crystal to the detector as the sample is rotated. (b) Goniostat positioned with the φ axis in the plane of the beam and the ω axis at its closest approach to the detector. The detector distance D is set to the shortest value that avoids creating goniostat shadows. The red star at the lower right shows the crystal. The orange oval describes the outer envelope of the φ-axis mounting. A is the angle between the φ axis and the outer envelope, which is 19.84° for a mini-κ goniostat. Smargon goniostats have a different construction, but the main shadow from the φ-axis mounting is a cone with a similar aperture angle as for the mini-κ. 2θmax is the highest angular deviation for a reflection that does not fall outside the detector, corresponding to the targeted resolution limit, and χmax is the highest value of χ that permits a 360° sweep without causing goniostat shadows. |
![[Figure 6]](gin5002fig6.jpg)
 | STRUCTURAL BIOLOGY |
ISSN: 2059-7983
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