Sphenix-tpc-l mailing list

[Thomas K Hemmick <tkhemmick AT gmail.com>]

The membrane is a honeycomb sandwich.  The thickness is 5.6 mm thick (which is 2X the stripe spacing of the outer shell).  The reasons for this are multiple and include forces during a magnet quench (something the warm magnet TPC folks never had to deal with).

Tom

On Mon, Oct 14, 2019 at 5:58 PM Sasha Milov <alexander.milov AT weizmann.ac.il> wrote:

hi

naively one would expect 3mm/2TPC_lengths * 2 = <0.5%

but edge effects can slightly blow it

best

sm

On Mon, 14 Oct 2019 at 23:48 Tarafdar, Sourav <sourav.tarafdar AT vanderbilt.edu> wrote:

Hi Sasha,

 

Thanks for the quick comments.

Yes, the membrane is 0.125” thick which is about 3.17 mm .

Thanks for pointing out about Y efficiency. I should add that number on slide #15. Basically we disn’t really see any significant change in the Y efficiency. Overall the Gaussian fraction to input upsilons in Geant4 is about 16%

Thanks,

-Sourav

 

From: Sasha Milov <alexander.milov AT weizmann.ac.il>
Date: Monday, October 14, 2019 at 5:23 PM
To: "Tarafdar, Sourav" <sourav.tarafdar AT vanderbilt.edu>
Cc: "sphenix_tpc_general AT skipper.physics.sunysb.edu" <sphenix_tpc_general AT skipper.physics.sunysb.edu>
Subject: Re: Draft for DNP19 talk

 

hi Sourav,

i didn't know about the thick membrane. is it 3mm thick?

looks fine, however, you only discuss the Y-line shape modification, what about Y efficiency reduction? is there a number?

best

a.m.

 

On Mon, Oct 14, 2019 at 10:55 PM Tarafdar, Sourav <sourav.tarafdar AT vanderbilt.edu> wrote:

Dear all,

 

Attached is the draft for my talk titled “Studies of a  central membrane for the sPHENIX TPC”  in DNP19. The talk is scheduled tomorrow  15^th October and allotted time is 10+2 minutes. Any suggestions are welcome. It will be helpful if the comments arrive before noon of 15^th October.

 

Thanks,

-Sourav

 

 

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Department of Particle Physics and Astrophysics
Weizmann Institute of Science
234 Herzl str. Rehovot 76100, Israel
tel/fax: +972 8 934 2848

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Department of Particle Physics and Astrophysics
Weizmann Institute of Science
234 Herzl str. Rehovot 76100, Israel
tel/fax: +972 8 934 2848