[Solid_tof] solid mrpc trigger response

Jian-Ping Chen jpchen at jlab.org
Fri Aug 19 16:34:11 EDT 2016

Hi, Mickey,

At the next SoLID collaboration meeting 8/26-8/27, I would like to have 
a discussion on
TOF improvement R&D. It will be very helpful if you can be here for the 
Will you be able to attend?



On 8/17/16 4:29 PM, Zhiwen Zhao wrote:
> hi, Yi and Mickey
> As you may know, we plan to use MRPC as part of SoLID SIDIS trigger to 
> reject photons
> To do the study, I simulated how particle deposit energies in mrpc gas 
> layers
> and assumes the MRPC response is something like below
> ========================================================================================== 
> 1. at least a single particle having energy deposition > 16eV for 
> ionization in one layer of Freon gas will fire this layer
> 2. the mrpc fires when the number of layers fires is at least n
> 3. I am guessing we can start the study with n=5 for trigger 
> threshold. We could use other value for charge particle detection.
> ========================================================================================== 
> Do you have any comment or suggestion?
> Another thing is about mrpc segmentation
> Because of low energy photons could be dominant background for mrpc, 
> the number and direction of segmentation may affect
> how high the occupancy by background is and how trigger performs.
> I see PreCDR has the design 50 supermodule and 3 modules per super 
> module, total 150 modules
> I assume the supermodules is segmented along azimuthal direction and 3 
> modules in each supermodule is along radial direction?
> Is there any freedom of changing the segmentation if trigger demands?
> Will that impact charge particle detection?
> Thanks
> Zhiwen
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