[G14_run] Eloss values for g14

[Eugene Pasyuk]

I agree, 2 MeV looks suspicious. 

-Eugene 

----- Original Message -----

> From: "Dr. A.M. Sandorfi" <sandorfi at jlab.org>
> To: "Eugene Pasyuk" <pasyuk at jlab.org>
> Cc: "g14 run" <g14_run at jlab.org>
> Sent: Wednesday, April 2, 2014 12:17:29 PM
> Subject: Re: [G14_run] Eloss values for g14

> Re: [G14_run] Eloss values for g14 Eugene,
> While there can be some discussion of the low energy acceptance
> limit, where the energy loss is quite large, my point was about much
> higher energies where the particles are essentially minimum
> ionizing. In that regime pions can’t loose less than 4.6 MeV when
> leaving the g14 IBC. (At lower energies they loose much more.) This
> discussion has come about following Dao’s tests of your Eloss which
> seem to show pion energy losses peaking at 2 MeV.

> Andy

> On 4/2/14, 12:00 PM, "Eugene Pasyuk" < pasyuk at jlab.org > wrote:

> > Andy,
> 

> > 65 MeV protons at vertex will not be detected in CLAS. Minimum
> > momentum of reliably reconstructed tracks for protons is at least
> > 300-350 MeV/c. They have to get through roughly 5 m of air, six
> > drift chambers and be detected in TOF counter. From that
> > reconstructed by drift chambers momentum eloss works backwards to
> > the vertex: ~1m of air, start counter IBC, the particle gains
> > energy.
> 

> > -Eugene
> 

> > > From: "Dr. A.M. Sandorfi" < sandorfi at jlab.org >
> > 
> 
> > > To: "g14 run" < g14_run at jlab.org >
> > 
> 
> > > Sent: Wednesday, April 2, 2014 11:23:00 AM
> > 
> 
> > > Subject: [G14_run] Eloss values for g14
> > 
> 

> > > Eloss values for g14 Folks,
> > 
> 

> > > Regarding ELOSS, the Tech Note (HDice_TN22) that I put together
> > > for
> > > Eugene can be downloaded from:
> > 
> 
> > > <
> > > http://www.jlab.org/Hall-B/HDIce/technotes/HDice_TN22_IBC_dEdx.pdf
> > > > .
> > 
> 

> > > The Appendix at the end gives examples of explicit energy loss
> > > evaluations for pions and protons (a) near the low end of their
> > > acceptance (25 MeV for pions and 65 MeV for protons) and (b) at 1
> > > GeV (~ minimizing ionizing for both). These were calculated for
> > > lab
> > > angles of 90 degrees where the material thicknesses are their
> > > least.
> > > The calculations assume events originate at the center of the
> > > target. As an extreme case, the Eloss from events coming from the
> > > outer edge of the HD nearest the detector would be down by the
> > > entries in the first two rows of the tables. There is no way a
> > > pion
> > > can loose less than 4.6 MeV by the time it exits the IBC and gets
> > > to
> > > the Start Counter.
> > 
> 

> > > Andy
> > 
> 
> > > _______________________________________________
> > 
> 
> > > G14_run mailing list
> > 
> 
> > > G14_run at jlab.org
> > 
> 
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> > 
> 
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