[G14_run] Eloss values for g14

[Eugene Pasyuk]

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 

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

> 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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