[Nexus] NXxas and NXMonitor

[Watts Benjamin (PSI)]

Hi Will,

   Yes, I agree with your interpretations of the "mode" and "preset" fields. There are 2 NXdetector instances in the instrument group to represent the 2 Keithley signals - The "absorbed_beam" link in "DATA" is clearly indicating to link to one of these. The "MONITOR" group should represent the I0 measurement and so its "data" group should link to the data field in the "incoming_beam" group - This is not so clear from the documentation. Unfortunately, I don't have an example file to give you. However, you can find a template file (written by a script interpreting the XML declaration without any actual data) at https://github.com/nexusformat/exampledata/blob/master/autogenerated_examples/nxdl/applications/NXxas.hdf5 that might be useful.


Cheers,

Ben

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From: NeXus <nexus-bounces at shadow.nd.rl.ac.uk> on behalf of Smith, William via NeXus <nexus at shadow.nd.rl.ac.uk>
Sent: Tuesday, 21 June 2022 4:53:30 PM
To: nexus at nexusformat.org
Cc: Smith, William
Subject: [Nexus] NXxas and NXMonitor

Dear Nexus Mailing List,

I am trying to map my data into the NXxas application definition. https://manual.nexusformat.org/classes/applications/NXxas.html#nxxas

The two DATA links make sense. The “energy” is the energies from my monochromator. The “absorbed” is the values from the detector which measures the absorbed beam. I am confused what the MONITOR group is for and why the parameters “mode” and “preset” are required and not optional.

In my beamline I am measuring the I0 and absorbed beam both with two current measuring devices (specifically Keithleys). They have an integration time. Should I make “mode” : “timer” and “preset” be the integration time?

Does anybody have any examples I can look at?

Many thanks,

Will

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