sPHENIX HCal discussion

[Abhisek Sen <sen.abhisek AT gmail.com>]

Hi John,

      As we discussed in the yesterday's hcal meeting, I looked into tower variations in the cosmic data from last test beam. It turns out the 12-13% variation that I quoted was without subtracting the geometry variation. Once I normalized the MPVs with respect to the simulation, geometry effect was taken out. Variation is ~6-7% among 16 towers (raw, no fit). I attached the plot below. As I mentioned, it can be further improved by adjusting the bias voltages. 

Cheers,

Abhisek

On Mon, May 1, 2017 at 11:02 AM John Lajoie <lajoie AT iastate.edu> wrote:

Dear HCAL'ers

    I have been charged by PM to come up with 1-2 "Key Performance Parameters" (KPPs) for the HCAL. For those of you not familiar with the DOE-speak on this, KPP's are low-level performance parameters that are necessary for the subsystem to ultimately perform its required role in the physics goals of the experiment. You have to be able to demonstrate that KPP's have been met prior to declaring the project complete, so they can't depend on lots of analysis and calibrations.

    As an example, you couldn't say "measure hadrons with a stochiastic term less than 100%/sqrt(E)".  That will require analysis and calibrations that might take a while after the first data is taken.

    So what should we use as KPP's for the HCAL? I have a few ideas, but I would like to hear what others have to say. For example, we could use something like: 

-> Tower cosmic ray gain calibrations within 10% tower-to-tower variation (Is this good enough? What did we achieve in the test beam?)

Keep in mind we only want 1-2 - NOT a laundry list.  We will be held to every KPP we set down, so they should be few and well thought-out.  Things like the fraction of live channels have already been called out by Ed at a higher level, so I am looking for HCAL-specific KPP's.

Let me know what you think

Regards,
John

--

John Lajoie

Professor of Physics

Iowa State University

 

(515) 294-6952

lajoie AT iastate.edu

Contact me: john.lajoie

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