[SBS_sim] Tracking efficiency g20

[Evaristo Cisbani]

Dear all,

looking more carefully at the APV25 manual, there are some restrictions
on the number of samples we can get and the distance between samples:

 - in peak mode we can get from 1 to 32 samples in step of 1, each
sample separated by at least 2 clocks period (and therefore, if I
understood correctly, the samples are separated by 75 ns).

 - in multi mode we can get from 3 to 30, in step of 3, each sample
separated by 25 ns.

Therefore if we want exactly 4 samples, we must run in peak mode; but in
this case the distance between samples should be 75 ns.

On the other hand, we can get 6 samples at 25 ns sampling, but we
require larger transfer time.

Take into account that shaping time and other parameters of the pulse
can be modified within certain extends.

Therefore I would suggest to assume 3 samples in the TRD, which already
provide reasonable results, and study and optimize later the number of
samples taking into account all pros and cons.

Evaristo





On Fri, 2011-05-13 at 15:03 -0400, Vahe Mamyan wrote:
> Dear all,
> 
> Please find attached new results of g20 analysis. 
> A new variable is introduced (Bogdan) to filter background. This new
> variable uses 4 samples instead of 3 used
> in previous analysis. This new variable is defined as 
> 
> R_new = ((amp[2] + amp[1] + amp[0] -Ao/(1.1*1.1*1.1) -Ao/(1.1*1.1)
> -Ao/1.1 ))^2 / ( (amp[2] -Ao/(1.1*1.1*1.1)) * (amp[1] -
> Ao/(1.1*1.1)) );
> 
> where amp[0], amp[1], amp[2] are strip signal integrated in the
> following intervals 0-25, 25-50, 50-75 ns respectively 
> and Ao is the strip signal integrated -25-0 ns. R_new is used in
> addition to R=(1.1 * amp[1] - amp[0])/ ( 1.2 * amp[2] - amp[0]).
> 
> Vahe
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-- 
 Evaristo Cisbani                      office : +39 06 4990 2847 
 Istituto Superiore di Sanita`         lab    : +39 06 4990 2347
 Department of Technology and Health   fax    : +39 06 4990 2137 
 and Istituto Nazionale di Fisica Nucleare Roma - gruppo Sanita`
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