[Solid_ec] SoLID EC meeting at 10am tomorrow

Wed Apr 3 17:14:17 EDT 2013

Hi, Zhiwen and Xiaochao,

Thanks for the update. In this case the new equal-rate division number will be:

Inner pad, R = 85 - 127 cm
Outer pad, R = 127 - 240 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: Zhiwen Zhao [mailto:zwzhao at jlab.org] 
Sent: Wednesday, April 03, 2013 4:59 PM
To: Xiaochao Zheng
Cc: jinhuang at jlab.org; solid ec
Subject: Re: [Solid_ec] SoLID EC meeting at 10am tomorrow

After seeing the layout of Hexagon, I think we should try to use SPD to cover all the EC area from 85 to 240cm in next round of background simulation.
To estimate the seperation now, Jin can just use the fitting formula and extrapolate to these values and we should have a rough number for IHEP.

Zhiwen

On 4/3/2013 9:14 AM, Xiaochao Zheng wrote:
> I agree with Jin on the first topic.
>
> On th second, the IHEP cost could depend on the size and the shape of the Sc pad. The size could also be limited by their production facility.
>
> Xiaochao
>
> 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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