[Lowq] Fwd: cc threshold mV vs ADC

[Yohann Perrin]

It seems that Maurizio has problems to send mails to lowq mail list,  
so I forward it.


Début du message réexpédié :

> De : Maurizio Ungaro <ungaro at jlab.org>
> Date : 8 octobre 2009 00:53:16 HAEC
> À : stepanya at jlab.org
> Cc : bueltman at jlab.org, lowq at jlab.org, Volker Burkert <burkert at jlab.org 
> >, Yohann Perrin <perrin at jlab.org>
> Objet : cc threshold mV vs ADC
>
> The following runs has been taken with different threshold today:
>
> RUN    Thr   ch1  ch2  ch3   ch4
> 60761  20    86   88   84    86
> 60763  40    162  172  172   175
> 60764  80    324  341  320   332
> 60767  100   400  415  413   410
> 60768  60    248  254  250   254
>
>
> You can find attached the correspondence between mV and ADC for the  
> various thresholds.
> 50 mV corresponds to 200 ADC which is the peak of the single  
> photoelectron peak.
>
> Let me remind you that, at the analysis stage, a NPHE > 25 cut is  
> now considered bad habit, since it cuts good electrons that, due to  
> low efficiency, only release 1-2 photo-electrons. They are still  
> good electrons. For this reason, I suggest to use a 40mV threshold  
> max. I also suggest to explore raising EC threshold.
>
>
> best regards,
> mauri
>
>

>
>
>

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