Re: [BLAST_ANAWARE] neutron counters in blast.geom

From: zhangchi (zhangchi@general.lns.mit.edu)
Date: Tue Jun 24 2003 - 12:14:39 EDT


Hi, Doug, I do not know if at this stage the NC geometry is important or
not. We have a bunch of big fans for neutrons, so they shall decide to
what extend they want reconstruction to process neutron information.

I extended lrn.cc yesterday such that it books the following entries:
vnn, tnn, fnn, znn. which are reconstructed neutron track velocity(in
cm/ns), theta, phi, and z vertex. the monte carlo data I generated
yesterday were processed with the modified lrn.

However because of the geometry issue, I remind people do not compare
those entries from monte carlo data and from real data. those from real
data would be totally wrong unless given proper geometry.

Chi

On Tue, 24 Jun 2003, Douglas Hasell wrote:

> Hi Chi,
>
> The current neutron wall (only the right side) is running and the
> geometry is set so that 70 degrees is roughly in the middle of the wall.
> However, this is a temporary position but could be put into the MC if
> someone gets the coordinates from Kelsey and then perhaps Aaron can put
> them into the MC.
>
> The final neutron and LADS geometry is also now know and can also
> be obtained from the CAD system and put into the MC.
>
> --On Tuesday, June 24, 2003 10:29 AM -0400 zhangchi
> <zhangchi@general.lns.mit.edu> wrote:
>
> >
> > Hi, Aaron and all the neutron fans.
> >
> > I send this email realizing that the neutron counter position is
> > different from listed in blast.geom.
> >
> > given correct geometry, reconstruction is able to calculate the neutron
> > counter hit position in blast coordinate system and link it with the
> > "average" vertex of wire chamber track(s) to make a track for neutron,
> > resolving the scattering angle and velocity. However, this is impossible
> > before the proper geometry is set up through blast.geom. And without
> > that, it would be hard pressed anyway to go any further from tdc/adc's.
> >
> > Just a reminder.
> >
> > Chi
> >
>
>
>
> Cheers,
> Douglas
>
> 26-415 M.I.T. Tel: +1 617 258 7199
> 77 Massachusetts Avenue Fax: +1 617 258 5440
> Cambridge, MA 02139, USA E-mail: hasell@mit.edu
>



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