[Halld-tagger] information on tagger vacuum window? TAGM geometry?

[Richard Jones]

Hello Dan,

I am out of town this coming week for a review in Gaithersburg, but I can
give a more full answer when I return later on in the week. The short
answer is that the geometry and magnetic field settings of the photon
source and tagger, including a detailed description of the microscope and
the hodoscope, is already incorporated into a Geant simulation. The
geometry is described in xml format, and is a part of the standard
sim-recon distribution which forms the base of the GlueX simulation and
reconstruction code. You can find it in the directory
src/programs/Simulation/gxtwist/hdds.

-Richard Jones

On Sun, Jun 12, 2016 at 2:34 PM, Daniel Sober <sober at cua.edu> wrote:

> I am working on a detailed Monte Carlo code for the tagger, and realized I
> do not know the location and thickness/material of the tagger vacuum
> chamber exit window. I need this for multiple scattering.  Can anyone
> provide it?
>
> Recently I have exhumed my Hall B code (not run since 2001) which
> incorporates the SNAKE subroutines into a free-standing Monte Carlo
> framework, and successfully run  trajectories through the Hall D field maps
> to the focal plane.  I am just beginning the task of setting up the TAGH
> and TAGM geometries.
>
> My initial goal is to calculate the acceptances and energy spectra of the
> high-photon-energy counters (TAGH 1-100), since these will be very
> sensitive to beampipe collimation and the quadrupole field.
>
> Unless someone else is working on it by some other route, I will also try
> to simulate the properties of the TAGM.  To do this, I will need a detailed
> geometry of the detector, plus some input about what you think is
> important, e.g. energy deposit spectrum for each fiber and correlation
> matrices between adjacent fibers with some given pulse height cuts.  If
> anyone has started working on such a code, I will happily accept
> contributions.  (My code is in fortran, but gfortran will also accept c++
> routines.)
>
> Dan
>
>
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