[G14_run] Test on the eloss package

[Dr. A.M. Sandorfi]

Thanks Haiyun,
This provides a direct comparison with my earlier direct calculation,
tracking the Eloss through sequential layers.

For protons:
- 65 MeV kinetic energy corresponds to 355 MeV/c momentum, for which your
Eloss plot gives 22 MeV for delta_E. It should be 27 MeV.
- at the upper end of your plot, 1000 MeV/c, or 433 MeV kinetic energy, the
delta_E seems to be a little under 4 MeV. This is closer, but still too low.
The delta_E shouldn't be less than 5.

Still the pion Eloss seems to be off the most.
Andy






On 4/9/14, 6:08 PM, "Reinhard Schumacher" <schumacher at cmu.edu> wrote:

> Hello Haiyun,
> 
> Nice work.  Your proton band looks like it gives higher energy loss for
> protons at a given momentum than Dao's and the others'.  At 300 MeV/c,
> your plot shows ~30 MeV energy loss, while Dao's shows ~10 MeV.  For
> pions the behavior is less clear: both your calculation and his give
> less than 2 MeV energy loss at 300 MeV/c, which is very likely too
> small.  So this leads to the questions:
> 
> 1) Why do you get higher, probably closer to correct, energy losses for
> protons?
> 
> 2) Why does the program give unrealistically small energy losses for
> everybody?
> 
> Reinhard
> 
> ___________________________________________________________________
> Reinhard Schumacher         Department of Physics, 5000 Forbes Ave.
> Carnegie Mellon University, Pittsburgh, PA 15213, U.S.A.
> phone: 412-268-5177         web: www-meg.phys.cmu.edu/~schumach
> ___________________________________________________________________
> 
> On 04/09/2014 05:16 PM, Haiyun Lu wrote:
>> Dear g14ers,
>> 
>> I did a straight test on the eloss package of g14. I made up some events
>> of proton and pi-. They are at fixed vertex position at (0,0,-7.5),
>> which is the center of the target. They are at the fix polar angle, 90
>> degree, which is perpendicular to the beam line. The azimuthal angle and
>> the momentum are variable. Then I plot the energy loss versus the
>> momentum for proton and pi-. I attached a file "eloss_test.png". There
>> are two bands in the histogram. The upper one is for proton and the
>> lower one is for pi-.
>> 
>> Best regards,
>> Haiyun
>> 
>> 
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