detector_geometry

A tool to project X-ray diffraction cones on a detector screen at different geometries (tilt, rotation, offset) and X-ray energies

• Main application is to visualize the maximum achievable resolution at a given geometry
• The math used is not meant to bring people to the moon but to provide a quick and simple preview
• The module building code is designed for Dectris Pilatus3 and Eiger2 Detectors but one-module systems like the Bruker Photon II are possible as well

Requirements

* [python3](https://www.python.org)
* [numpy](https://numpy.org
* [matplotlib 3.5.1](https://matplotlib.org)
* [pyFAI](https://github.com/silx-kit/pyFAI)

Short how-to:

• Edit the .py file:
  • Choose a detector (Eiger2 or Pilatus3)
  • Choose a model (300K, 1M, 2M, etc.)
• run it
• Use the sliders to change energy and geometry
• Use the radio buttons to change contour units

Latest update:

• 2022-06-07 Update: Added functionality to plot Standard (LaB6, CeO2) contours (needs pyFAI)
• 2022-06-07 Update:
• 2022-04-28 Update: Changed contour line generation to accept a list of 2-theta values as input
• 2022-04-27 Update: Added support for SACLA MPCCD Detectors (central hole geometry)
• 2022-04-25 Bugfix: calculation of the beamcenter (rotation and tilt)
• 2022-04-25 Bugfix: unresponsive radio buttons / redrawing the figure

Here's an example showing a rotated Eiger2 4M:

Limits and Plot details can be changed in the .py file

To add a detector:

• Choose 'Name' and 'Version' (will be used in the figure title)
• 'Name' must not start with 'Pilatus' or 'Eiger', those are pre-set

Geometry	Value	Hint
geo.det_type	'Name'	[str] Pilatus3 / Eiger2
geo.det_size	'Version'	[str] 300K 1M 2M 6M / 1M 4M 9M 16M

• Adjust the "ADD CUSTOM DETECTOR SPECIFICATIONS HERE" section
• The pixel size is only used to calculate the gap size

Detector	Value	Hint
det.name	'Name Version'	[auto] Generated
det.hms	100.0	[mm] Module size (horizontal)
det.vms	140.0	[mm] Module size (vertical)
det.pxs	135e-3	[mm] Pixel size
det.hgp	0	[pix] Gap between modules (horizontal)
det.vgp	0	[pix] Gap between modules (vertical)
det.hmn	1	[int] Number of modules (horizontal)
det.vmn	1	[int] Number of modules (vertical)
det.cbh	0	[mm] Central beam hole

I hope this turns out to be useful for someone!