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skoupy_r
2024-03-15 17:13:05 +01:00
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Controls.md

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List of controls consists of all parameters needed for proper dataset acquisition design. These are taken from calibration file **calibrations.xlsx** and may differ microscope to microscope. They are divided accordingly to their main influence (some of them may affect several features).
##### Beam
- **Aperture** probe forming aperture gives probe semi-angle (α)
##### Electron beam settings
- **Energy** energy of primary electron beam in keV
- **Probe** probe setting together with chosen probe forming aperture give probe current
- **Probe** probe setting together with chosen probe forming aperture give probe
current
- **Defocus** moves focus out of the sample plane - enlarges beam diameter
##### Scanning
- **Aperture** probe forming aperture gives probe semi-angle (α)
##### Scanning parameters
- **Magnification** controls image field of view
- **Matrix** gives beam position to position distance + beam defocus = beam overlap
##### Camera length
- **Nominal CL** sample to detector distance (usually ADF) gives maximal detected angle as well as angular sampling
- **Use PAAR** Pumping Aperture Anglar Restriction, build-in aperture may limit maximal scattering angles for shortest camera lengths
##### Detection
- **Detector** detector used for data collection
- **Binning** reduction in pixel array size usually increases maximum frame rate
- **Dwell time** single position beam time
##### Detection
- **Nominal CL** sample to detector distance (usually ADF) gives maximal detected angle as well as angular sampling
- **Detector** detector used for data collection
- **Use PAAR** Pumping Aperture Angular Restriction, build-in aperture may limit maximal scattering angles for shortest camera lengths
- **Binning** reduction in pixel array size usually increases maximum frame rate
##### CL guide
- build in checks for proper camera length selections for iterative reconstruction
Always carefully check maximal detector frame rate, needed binning and set dwell time!!