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Re: [Sphenix-tracking-l] magnetic field in the tracking volume

From: Thomas K Hemmick <hemmick AT skipper.physics.sunysb.edu>
To: Achim Franz <afranz AT bnl.gov>
Cc: "sphenix-tracking-l AT lists.bnl.gov" <sphenix-tracking-l AT lists.bnl.gov>
Subject: Re: [Sphenix-tracking-l] magnetic field in the tracking volume
Date: Fri, 30 Oct 2015 11:54:16 -0400

Hi Achim

I merely showed a plot that stated that the field *lines* were quite friendly to a TPC (for which they should not enter/exit the radial boundaries) and people hoped that maybe it was even uniform enough that mapping might not be necessary (not my conclusion, but I think Phil Pile and Yousef tossed this possibility around). Thanks for adding more quantitative info to the discussion.

Tom

On Fri, Oct 30, 2015 at 11:40 AM, Achim Franz <afranz AT bnl.gov> wrote:

Hi,

yesterday during the dress rehearsal Tom showed a plot of the central magnetic field where the tracker is located and the argument was that the field is rather stable there and a detailed mapping may not be necessary. I took one of the sPHENIX 2D maps and plotted the deviation from the field at 0/0 which is Bz only. The deviations are less that 4% and mainly < 1%. Br is very low in that region.

Achim

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[Sphenix-tracking-l] magnetic field in the tracking volume, Achim Franz, 10/30/2015
- Re: [Sphenix-tracking-l] magnetic field in the tracking volume, Thomas K Hemmick, 10/30/2015