05/06/04 07:52

Hi Richard,

Sebastien Bourdarie from Toulouse is visiting here for a two months
and has expressed some interest in HISTp.  Now I was under the
impression that the proton data was not calibrated very well and that
one should be very careful using it.

Do you have any updated info on this? Or even betterm a workable set
of calibrations for the protons?  Are the nominal energy channel
values believable?

Any info would be much appreciated.

            Many thanks
            Reiner


Hi Reiner
            
Your general impression is correct, although it is easy for anyone to
calibrate the proton response numerically.  I did that some time ago
and the results are in the attached plot.  I never used these for
anything because the high energy part doesn't work very well.  The
problem is that when protons reach the C detector there is no
anti-concidence shield and penetrating protons look just like stopping
protons.  That is why the high numbered channels have a double
response and you can't tell which energy you are looking at.  But if
you only want the spectra below ~20MeV, or if you know that the
spectra are soft enough, then they should work ok.  Let me know if you
would like any more details or if you make any progress with the
proton data.  

Richard


05/06/04 03:58
Tx got it.

Do you have the geom factors and energy ranges in a file too? Bit difficult
reading them off the plot...
Efficiencies - simply use "1"?

Tx
Reiner


Hi Reiner,
I don't have exactly that but here are the tables of numbers and the idl
program that made the plot.
They are also on drop.aero.org.
To make the plot in IDL:

.run simtel
do_chanplot

Yes, use 1 for efficiency.
(I also have something for calculating spectra that I could probably dig up.)
Feel free to ask any more questions.
Richard

(See attached file: simtel.out1H)(See attached file: simtel.out2H)(See
attached file: simtel.pro)(See attached file: simtel.out3H)(See attached file:
simtel.out4H)