[Solid_ec] [EXTERNAL] Re: SoLID EC meeting 9:15am Thursday 5/7/2020

Thu May 7 23:44:43 EDT 2020

Dear Xiaochao,

Sorry for my worse network in last meeting. I list what we care as 
following:

1 about the energy resolution and light yield:

     As I understand, we define the energy resolution  of ECal with 1 
GeV electron.  I did quickly caculate: muon deposite energy about 2 
MeV/(g.cm-2) in carbon, totle thinkess of scintillator is 30 g/cm2, so 
muon deposite 60 MeV in scintillator. 1 GeV electron almost deposite all 
energy in ECal, the mass ratio of scintillator and lead is Msc/Mpb=0.3, 
so about 300MeV deposited in scintillator.

So 1 GeV electon light yield is 5 (300/60) times high than single muon.  
If this is truth, we will receive more than 2500 PE (the old module 
already reach 500 PE per muon). So the energy resolution will be good 
enough.

We need your GEANT simulation to confirm the quirk calculation.

2 The assambly support

We once manufactured the assambly support according to Xiaochao provided 
drawing. We find some problem to assamble the modules with these 
support. Do we have new idea on assambling the module? The new module 
should match the assembly support, which also effect how to build the 
module, especially on the fible processing.

3 PMT and divide

who is charge of the PMT and the high voltage divider? the signal is 
also depended on PMT and divide.

With best,

Cunfeng

在 2020/5/7 2:14, Xiaochao Zheng 写道:
> Dear All:
>
> We will have our next EC/DAQ meeting at 9:15am on Thursday 5/7/2020.  
> The call-in information is as usual, see below.
>
> (For our Chinese collaborators, please double check the timing 
> difference between China and US EDT.)
>
> Cheers,
>
> Thanks,
>
> Xiaochao
>
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