[Solid_ec] SoLID EC/DAQ meeting 9:30am Thursday 9/1/2016 CC F227

[Ye Tian]

Hi JianPing and Xiaochao,
   I want to discuss the possibility of using left/right HRS as trigger to
get the energy of electron hitting shashlyk calorimeter.  For that purpose,
we need to get coincidence events triggered by left/right HRS. (The
experiment ultilize electron beam hit proton target.) The HRS will detecte
a *proton* with specific angle and energy, and at the same time,  if that
proton is scatteed by elestic scattering, *elestic scattered electron* will
appear at confirmed angle with specific energy, that means we could get the
electron energy. And that's the method how we calibrate DVCS photon
calorimeter, the difference comparing with shashlyk is that it is made of
small PbF2 crystal blocks.
   To achieve that purpose, we could put the detecters between beam and
Left HRS, or other side of Left HRS, and use the right HRS as trigger.( I
think for most beam time, the right HRS is "free".) What we need to do,
comparing with triggered by detecter package itself, is just add a trigger
cable coming from right HRS, wihch may not influence the normal work of
right HRS, and also add long dealy cable in our detecter package.
   The elestic rate is very high, it could be completed in a few hours for
one specific energy even at low beam current.
   It's just my suggestions. Preparation time is limited and I'm not sure
if the suggestion could come ture.

Best Regards,
Ye Tian

Shandong University

On Wed, Aug 31, 2016 at 9:18 PM, Xiaochao Zheng <xiaochao at jlab.org> wrote:

> Dear All:
>
> We will have our SoLID EC/DAQ meeting at 9:30am US EST on Thursday
> 9/1/2016. The location at JLab is CC F227.
>
> We will focus on updates from the Chinese groups. Hope to hear reports
> from both SDU and THU on their module assembly and testing. We will then
> discuss preparation work (if any) for the beam test.
>
> Prof. Wang Yi and Chendi:  It will be great if you can prepare a summary
> slide on the module(s) you have assembled so far, with details presented in
> a table, such as type of the WLS fiber, reflective layer, scintillator, and
> lead layers.  In fact, I think it might be helpful if we can have at least
> one preliminary light yield measurement of THU's module before shipping
> them to the US. Do you think you can setup a cosmic ray test similar to
> SDU's?  (See Ye Tian's reports on the meeting minutes).  Alternatively, you
> could consider shipping or bringing the modules to SDU and let Ye test the
> module using his setup. (It takes the high-speed train 4-5 hours to go from
> Beijing to Jinan, so one could just carry the module and board the train).
> Is that possible?
>
> The call-in instruction is shown below. Meeting minutes can be found at
>   http://hallaweb.jlab.org/experiment/PVDIS/SoLID/EC/
> meetings/SoLID_EC_Weekly_minutes.html
>
> If you have slides to present, please email them to everyone by replying
> to this email (or to me) before the meeting.
>
> Thanks,
>
> Xiaochao
>
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