[Halld-tagger] [New Logentry] TPOL recabling and translation table

[jrsteven at jlab.org]

Logentry Text:
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This turns out to be more challenging to implement in the offline software than originally expected.  The DTPOLHit factory and later plugins actually do their own hard-coded translation from crate/slot/channel -> sector

https://github.com/JeffersonLab/halld_recon/blob/tpol_slot/src/libraries/TPOL/DTPOLHit_factory.cc#L253

My suggestion would be to put the correct translation from crate/slot/channel -> sector in the CCDB and remove this GetSector() code from the hit factory and plugins.  Otherwise this code would not be backwards compatible or would need run-dependent conditionals, which we should do our best to avoid.

There is a branch on halld_recon https://github.com/JeffersonLab/halld_recon/tree/tpol_sector where this is implemented for the DTPOLHit factory and can be used with the a translation table at /work/halld2/home/jrsteven/tagmTT/tt_RunPeriod-2019-11+.xml  with the following command

hd_root -PTT:NO_CCDB=1 -PTT:XML_FILENAME=/work/halld2/home/jrsteven/tagmTT/tt_RunPeriod-2019-11+.xml -PPLUGINS=occupancy_online,TPOL_online /cache/halld/RunPeriod-2019-11/rawdata/Run071346/hd_rawdata_071346_000.evio

I tried to implement the hardcoded mapping from the old hit factory in the new TT file (as I understood it), but someone else needs to check that this is correct.  There seem to be signals in all but 1 sector (which I believe is expected) as seen in the figure below for run 71346 (using the branch, TT file and command given above).

[figure:1]

I think it's still worth checking the setting on the f250 boards as was discussed at this morning's run meeting.

TPOL experts: I'll wait for confirmation from you before making any pull requests or CCDB uploads.

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