[Halld_src] [EXTERNAL] Re: Hall D SRC meeting Tuesday

[Axel Schmidt]

Dear all,
	It was pointed out in the meeting that we wanted to use copper instead of iron, due to concerns about the magnet. Here's an updated draft that uses copper.

Answering your questions, Or:

1)	C: 2.73 g/cm^2
	Cu: 1.60 g/cm^2

I've added this to the write-up.

2) This point was raised in the meeting, and we discussed that this "inter-leaf" design is a risk if we can't separate adjacent foils. Nathaly is going to do a quick simulation study to see what we can expect. Here's an alternate design that still preserves acceptance but adds additional separation between the foils. I'll wait to implement in the write-up until Nathaly has some conclusions from the simulation study.



Obviously, if we wanted to be even more conservative, we could just have two foils, 30 cm apart at opposite ends of the target. Or a carbon multifoil and a copper multifoil, and sacrifice the running time to switch targets. 

Thanks for the feedback!
-Axel


________________

> On Mar 9, 2021, at 10:43 , Or Hen <hen at mit.edu> wrote:
> 
> Hi,
> 
> Thanks.
> 
> 1. What is the relative total density (g/cm2) of C and Fe in this setup?
> 
> 2. Seems like this is optimized to match acceptance between C and Fe. Are we sure we can separate the C and Fe foils well enough on an event by event basis?
> 
> Or
> --
> Or Hen,
> Massachusetts institute of Technology,
> Cambridge, MA 02139, USA.
> https://urldefense.proofpoint.com/v2/url?u=http-3A__www.hen-2Dlab.com&d=DwIFAg&c=CJqEzB1piLOyyvZjb8YUQw&r=66Sb4pp0d4diwFuNQ_jTiKyZDsB_FG2X3Hlmk9_wuSY&m=tdwAl4Xi0NTX5It5Rhu7plcwDYARWVL11ctHfEFTF_g&s=SbCLwX7an_39PVIh3KX5oMAIWDew4TNWLijv91GFWec&e=  <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.hen-2Dlab.com_&d=DwIFAg&c=CJqEzB1piLOyyvZjb8YUQw&r=66Sb4pp0d4diwFuNQ_jTiKyZDsB_FG2X3Hlmk9_wuSY&m=tdwAl4Xi0NTX5It5Rhu7plcwDYARWVL11ctHfEFTF_g&s=-EkVKqdud6CKCW8AlQlIsWZtJU6PoRfMJ_LJXqacsP0&e= >
> 
> 
>> On Mar 9, 2021, at 9:15 AM, Axel Schmidt <axelschmidt at gwu.edu <mailto:axelschmidt at gwu.edu>> wrote:
>> 
>> Dear colleagues,
>> 
>> Here is a draft 1-page summary of our plan for a multi-foil target including iron.
>> 
>> Thank you for your patience,
>> Axel
>> 
>> <target_plan_v0.pdf>
>> 
>> ________________
>> 
>>> On Mar 8, 2021, at 13:43 , Holly Szumila-Vance <hszumila at jlab.org <mailto:hszumila at jlab.org>> wrote:
>>> 
>>> Dear all,
>>>   
>>> We will meet tomorrow at 9:15am (EST) via Zoom: https://urldefense.proofpoint.com/v2/url?u=https-3A__mit.zoom.us_j_97008559046&d=DwIFAg&c=CJqEzB1piLOyyvZjb8YUQw&r=66Sb4pp0d4diwFuNQ_jTiKyZDsB_FG2X3Hlmk9_wuSY&m=tdwAl4Xi0NTX5It5Rhu7plcwDYARWVL11ctHfEFTF_g&s=mb85dxUFld2YUagRcSht6WBG4iDtSH4NSBo_IEuv9Y8&e=  <https://urldefense.proofpoint.com/v2/url?u=https-3A__mit.zoom.us_j_97008559046&d=DwMGaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=NNRUDg2C8cJitJ467evUCKcfCgAu8FJaa8E-U6WOa6I&m=OffH7_oajH3Vlk4jkNDHoo1Hgp5GozvspHVELXTPzdw&s=ZU6l6H4qstJujS9pwaEdIw0DHidVo4RgMoomLqjvLfA&e=>
>>>  
>>> -Holly
>>>  
>>> _______________________________________________
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