corr_mode="i0" not functional due to missing(?) dataset variable

[KSRandazzo]

Attempting to load data using corr_mode="i0" does not work as expected. For example, the following code:

load = phs.load.SST1RSoXSDB(corr_mode="i0", catalog=cat["rsoxs"]["raw"])

results in the error:

KeyError: "No variable named 'RSoXS Au Mesh Current'. Variables on the dataset include []"

This occurs even though "RSoXS Au Mesh Current" appears in the metadata.

As a result, users can't apply i0 correction during data loading, and instead must load with corr_mode="none" and apply the correction manually downstream.

[pbeaucage]

Thanks for the issue!

Ideally I'd have this in documentation, but we should be producing the mesh current via the SST1RSoXSDB.loadMonitors() function with the argument interpolate_onto_images=True.

In effect, scalar counter data (like i0) on SST-1 RSoXS is collected as continuous streams, so has to be down-sampled using timestamps onto the images. This process has more or less ~never worked correctly.

I'd start debugging this by trying to directly call loadMonitors(load.c[run#]) and see what errors come up. Might be something simple.

[pbeaucage]

I did a little more research on this this morning; SST-1 RSoXS removed the magic word "monitor" from the stream names at some point, so of course loadMonitors doesn't work; the data doesn't contain any monitors.

[pbeaucage]

... actually, the entire concept of monitors was removed at some point. Huzzah.

I think I can get this working again pretty easily. I cannot guarantee that the new normalization data are correct. Great pains went into making sure they were correct when we were provided with the raw data; now that that's no longer saved it's much harder to be sure.