sPHENIX tracking discussion

[David Stewart <0ds.johnny AT gmail.com>]

Morning,

I won't make the 10 o'clock meeting, but wanted to send a quick update.

My task is to general clusters on the node tree of, layer-by-layer in the TPC, the mean and variance of hits from embedded tracks. 

A few points:

1. After looking through the sPHENIX core code (with particular attention to the evaluators), I don't believe there is a structure on the node tree that has a mapping of the embedded tracks to primary hits. This would be more efficient for what I am doing, but isn't a show stopper. I will simply loop through all hits and pick up the ones associated with primary tracks as I go along. It will be simple enough to change later when the structure either becomes available, I write it myself, or, if it is already available, I find it.

2. The mapping to TPC layers is already modelled in the code, so is present

3. The memory management of keeping hits locally in memory and flushing to the node tree as needed is also present. Due to the lightness of the data structure, and the ordering of the tracks, I don't anticipate needing this.

Hope to have updates soon with prototypes later this week. Thanks for the input from the software help hour!

Dave

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David Stewart

Postdoctoral Fellow | Department of Physics, Wayne State University