[Solid_ec] SoLID EC meeting at 10am tomorrow

[Jin Huang]

Hi, Zhiwen,

Thanks for the comment. My reply would be following

> Another idea is do 120 segmentation all in fan shape instead of 60 fan
with two section.
Did we exclude that?

My understanding from previous discussion is YES. One important reason is
that 60x2 segmentation have better scintillator pad to shower
correspondence. For example, in 120x1 segments, the inner width of the
module is half of the width of one calorimeter module. Therefore, when one
inner calorimeter was triggered, two segments in in scintillator will be
checked in trigger level, which effectively reduced it to 60 segments. 


> Either way, I think WLS fiber is a preferred way to readout so that we
don't need worry about light propagation and PMT in field.

> For realistic EC layout, I think the SPD inner radius needs to be around
85cm and outer 240cm So where exact the separation of the two sections
exists is only an rough estimation. I don't think IHEP really needs it now.

Your background simulation only covered R = 100-220 cm, which is consistent
with forward calorimeter size in our write up too. If in final layout you
find the scintillator need to be larger, please update both. 

And I agree that this change should NOT matter at this stage as well as for
communication to IHEP.


Cheers

Jin

__________________________________________

Jin HUANG

Los Alamos National Laboratory
PO Box 1663, MS H846, Los Alamos, NM 87545

Office:(505) 665-2523, Cell:(757) 604-9946
__________________________________________



-----Original Message-----
From: Zhiwen Zhao [mailto:zwzhao at jlab.org] 
Sent: Tuesday, April 02, 2013 2:08 PM
To: jinhuang at jlab.org
Cc: 'Xiaochao Zheng'; 'solid ec'
Subject: Re: [Solid_ec] SoLID EC meeting at 10am tomorrow

Another idea is do 120 segmentation all in fan shape instead of 60 fan with
two section.
Did we exclude that?

Either way, I think WLS fiber is a preferred way to readout so that we don't
need worry about light propagation and PMT in field.

For realistic EC layout, I think the SPD inner radius needs to be around
85cm and outer 240cm So where exact the separation of the two sections
exists is only an rough estimation. I don't think IHEP really needs it now.

Zhiwen

On 4/2/2013 11:48 AM, Jin Huang wrote:
> Hi Xiaochao,
>
> Following our discussion, I am writing to suggest radial segmentation 
> for SIDIS forward photon-rejection scintillator pad.
>
> The rate VS R distribution was shown on page 7 of the last 
> collaboration meeting talk. It can be well parameterized with
> Rate = E^(11.0391 - 0.0212754*R)*R   Hz/cm^2
>
> Therefore, if we require equal rate on the two radial segments of 
> scintillator pad, the division will be 100-137 cm and 137-220 cm.
>
> Cheers,
>
> Jin
>
>
>
> __________________________________________
>
> Jin HUANG
>
> Los Alamos National Laboratory
> PO Box 1663, MS H846, Los Alamos, NM 87545
>
> Office:(505) 665-2523, Cell:(757) 604-9946 
> __________________________________________
>
>
>
> -----Original Message-----
> From: solid_ec-bounces at jlab.org [mailto:solid_ec-bounces at jlab.org] On 
> Behalf Of Xiaochao Zheng
> Sent: Monday, April 01, 2013 2:15 PM
> To: solid ec
> Subject: [Solid_ec] SoLID EC meeting at 10am tomorrow
>
> Dear All:
>
> This is a reminder that we will have our weekly SoLID EC meeting 
> tomorrow at 10am.
>
> Call in instruction is as follows:
>
> US 866-740-1260 International 303-248-0285 Access code: 8206694
>
> JLab people should meet in room L102.
>
> Cheers,
>
> Xiaochao
>
> ----------------------------------------------------------------------
> ------ Associate Professor, Department of Physics, University of 
> Virginia
> 382 McCormick Rd, Charlottesville, VA 22904
> Telephone: (434) 243-4032 (during academic year); or (757) 810-2885 
> (summer)
> Homepage: http://people.virginia.edu/~xz5y/Main.html
> ----------------------------------------------------------------------
> ------
>
>
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