[SBS_sim] Tracking efficiency g20

[Bogdan Wojtsekhowski]

Hi Evaristo,

It is in agreement with Igor Rachek. However, I am wondering
if the two rejection parameters (see GEM analysis section of
the Response to TR2) could be calculated in VME module (which
require 4 sample) and than only three of them moved to CPU.
Could you provide a timing diagram and a calculation of the
readout time?

> 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`
>  via Regina Elena 299 - 00161 Rome     web    : www.iss.infn.it/cisbani
>  Italy
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-- 
Bogdan Wojtsekhowski
TJNAF, 757-269-7191

-- 
Bogdan Wojtsekhowski
TJNAF, 757-269-7191