Dectris EIGER 2 - Interdependency of Configuration Parameters; Interdependency of Calibration Parameters

7.4. Interdependency of Conguration Parameters
7.4.1. Interdependency of Calibration Parameters
The following calibration parameters have an implied or direct dependency. Changing either of the parame-
ters might inuence other parameters in the list.
• detector | cong | photon_energy
Changing photon_energy sets element to an empty string and sets wavelength to its corresponding value. The
threshold/1/energy is set to half of photon_energy, which is the optimal threshold energy in most cases. The
threshold/2/energy is set to 1.3 × photon_energy, which can be used to suppress higher energy photons and
cosmic radiation. In order to use values dierent from the defaults, the threshold/n/energy should be explic-
itly set after setting photon_energy. The ateld is recalculated whenever a calibration relevant parameter is
changed.
• detector | cong | element
Setting the element is equivalent to setting photon_energy to the energy of the K
α
1
emission line of the element.
Hence, photon_energy, wavelength and all parameters that depend on photon_energy are changed accordingly.
• detector | cong | wavelength
Setting the wavelength is equivalent to setting photon_energy to the equivalent energy of the wavelength.
Hence, photon_energy, element and all parameters that depend on photon_energy are changed accordingly.
• detector | cong | threshold/n/energy
Changing threshold_energy for a threshold causes the ateld for this threshold to be recalculated.
• detector | cong |
ateld
The ateld applied for a given photon_energy and threshold_energy is a result of the detector calibration. Dur-
ing the factory calibration a multitude of atelds at dierent settings have been recorded to ensure optimal
data quality of the ateld for all common settings.
DECTRIS EIGER
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