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Figure 2
(a) Schematic of the KOALA instrument. The incident beam h travels along the instrument y axis. During an experiment the crystal is rotated about the vertical z axis by an angle Δϕ between successive patterns. Each reflection h is characterized by the horizontal and vertical polar angles γ, ν. (b) The angle ϕ orients the mini-DAC with respect to the incident beam, ψ is the angle a reflection h makes with the mini-DAC axis. The geometry of the mini-DAC creates an opening half angle ω which limits the direction of the incident beam.

IUCrJ
Volume 3| Part 3| May 2016| Pages 168-179
ISSN: 2052-2525
doi:10.1107/S2052252516000725