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titleDAWN looks complicated, where can I get help using it?

DAWN has a lot of functionality, and with this can come complexity. As a complete beginner to DAWN, we recommend going through the DAWN Tutorial Sheets (Diamond staff can register for the DAWN training sessions), but there is also useful guidance in the help section and cheat sheets. If you think you have found a bug in DAWN, please use the feedback form (Help/Leave Feedback) to tell us about it. Alternatively contact scientificsoftware@diamond.ac.uk  

 



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titleHow do I fix the colour scale (histogram) for images?

When watching live image updates, for example when slicing though a stack of images, it is often useful if the colour scale does not automatically recalculate the scale based on the image data, especially when one wishes monitor a change in intensity. The Colour mapping tool in DAWN has an action to set "Histogram range locked for this image" in the view menu and on the toolbar. Checking this action means the current colour scale will be applied to all future plotted images, regardless of the range of the data.

As a note, with the colour scale locked the image update rate should be significantly faster, since the range does not need to be calculated for each image and this process can be expensive especially when using the Outlier Values Type.

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titleWhere did you get the values for the Diffraction Calibration Standards?

Various places....

Ag Behenate - Huang, Toraya, Blanton & Wu, 1993 (58.380)

Silicon -  2010 CODATA (5.4310205, Diamond FCC)

Cr2O3 - NIST SRM 674 [4.95916(12), 13.5972(6)] trigonal - hexagonal scalenohedral

CeO2 - NIST SRM 674 (5.41129, FCC)

LaB6 - NIST SRM 660a (4.1569162, Cubic) 



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titleWhat angles correspond with what areas on a 2D plot/image

Image Added


Python

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titleCan I use the CCTBX python distribution in DAWN?

Yes. When you configure the python intepreter (Window/Preferences/PyDev/Interpreters/Python Intepreter), select New... and point the the cctbx python executable.

The default python distribution on the Diamond site includes cctbx and the Anaconda python distribution.

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titleHow do I make the python debugger stop on a break point?

In the "Run" menu, go to "Manage Python Exception Breakpoints", and select the exceptions you are interested in and check "Suspend on Uncaught Exceptions"

 

 

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