[G14_run] Eloss values for g14

[Dr. A.M. Sandorfi]

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
can¹t loose less than 4.6 MeV when leaving the g14 IBC. (At lower energies
they loose much more.) This discussion has come about following Dao¹s 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 
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> 
> 

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