Converter from IDepo to LArSoft SimChannel

[brettviren]

This is really for larwirecell and it still isn't clear what exactly is needed.

LArSoft has SimChannel and microboone wants to fill it with "Wire-Cell information". This class associates between:

• track ID (ie, Geant4 track ID)
• tick
• numbers of electrons (presumably the number which passed by the channel's wire during the tick)
• energy (presumably the energy lost in producing the number of electrons)
• a 3D point which gives some characteristic location of the distribution of electrons counted above

This association is per-channel.

This thus provides effectively a per-channel/per-tick histogram of the distribution of drifting electrons passing a wire plane.

• [ ] In order to compare the drift model of WCT sim to LArSoft a convert from IDepo to SimChannel is needed.

• [ ] The job to produce SimChannel needs to invoke just Drifter

However, if one were to use SimChannel as prepared above to compare to WCT SP output there will be a mismatch due to broadening that occurs from the variation in drift paths and their field response within a wire region. This broadening may be added into SimChannel but requires a more full simulation.

[brettviren]

Some clarity on this: indeed SimChannel can be produced directly from post-drift depos. This boils down to forming per-trackID 2D histograms in channel vs tick from the depo charge distribution in time vs transverse position for each wire plane. As this is purely a larwirecell issue, it will be removed from the 0.8.x release project.

[brettviren]

Moved to here: https://github.com/WireCell/larwirecell/issues/1