[Solid_ec] SoLID EC meeting at 10am tomorrow

Fri Apr 5 16:41:08 EDT 2013

Hello Xiaochao,

It could be that I sent you an older drawing.  The original drawing 
didn't cover the full area, but I thought I had that changed.

Paul

On 4/5/13 3:37 PM, Xiaochao Zheng wrote:
> Hi Zhiwen:
>
> looking at Paul's endplate layout design I don't see why you need from 85 to 240cm. Can you elaborate?  I have attached Paul's drawing which is from about 100 to 250cm. It's for both SIDIS and PVDIS. For SIDIS I suppose only the portion from 100 to 220cm will be filled.
>
> Xiaochao
>
> ----- Original Message -----
> From: "Zhiwen Zhao" <zwzhao at jlab.org>
> To: "Xiaochao Zheng" <xiaochao at jlab.org>
> Cc: jinhuang at jlab.org, "solid ec" <solid_ec at jlab.org>
> Sent: Wednesday, April 3, 2013 4:59:05 PM
> 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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>>
>>
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>> Solid_ec mailing list
>> Solid_ec at jlab.org
>> https://mailman.jlab.org/mailman/listinfo/solid_ec

-- 
Paul E. Reimer                 +1-630-252-4037 (Argonne Office)
Physics Division Bldg 203      +1-630-252-3903 (Argonne Fax)
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