sPHENIX MAPS tracker discussion

[Xin Dong <xdong AT lbl.gov>]

Hi Ming,

Sure. It should be quick to update with the 28x28 microns. The reason I choosed this in the beginning is to match the setting in the full GEANT simulation (according to my understanding). I believe the difference will be mostly at high pT where the single hit resolution becomes the driving factor.

Best Regards

/xin

On Fri, Jan 20, 2017 at 3:55 PM, Ming Liu (ming AT bnl.gov) <ming AT bnl.gov> wrote:

Hi Xin,

Very nice work!  One minor note, the currently proposed MAPS has the pixel size 28 x 28 um, not 20. I understand the effects are not large, but it would be nice to make the same study with the correct pixel size. 

Cheers,

Ming 

-- 

Ming Xiong Liu

P-25, MS H846 TEL: 505-667-7125 

Physics Division 631-344-7821(BNL)

LANL 630-840-5708(FNAL)

Los Alamos, NM 87545 FAX: 505-665-7020

From: <sphenix-maps-l-bounces AT lists.bnl.gov> on behalf of Xin Dong <xdong AT lbl.gov>
Date: Friday, January 20, 2017 at 1:22 PM
To: sphenix-maps <sphenix-maps-l AT lists.bnl.gov>
Subject: [Sphenix-maps-l] Why do we need fast MAPS

Dear All,

To address this question more explicitly for the pre-proposal preparation, I did some calculations using the tool developed for STAR HFT based on the Billoir linearized Kalman filter method (see a bit detail in the Santa Fe presentation, and it shows consistent pointing resolutions w.r.t to the sPHENIX full GEANT simulation too

https://indico.bnl.gov/getFile.py/access?contribId=7&sessionId=0&resId=0&materialId=slides&confId=2641

- courtesy of Jim Thomas and Howard Wiemann)

I tried the following two cases

1) TPC+MAPS vs. TPC+Hybrid

    both are three silicon layers at r = 2.3, 3.2, 3.9cm    
    Hybrid       1%X0, 50x425um per layer
    MAPS         0.3%X0, 20x20um per layer  

  Then compare the pointing resolution from both cases.

2) TPC+MAPS         0.3%X0, 20x20um per layer
    two configurations,  20 micro-second and 200 micro-second integration time

   Then compare the efficiency (good hit probability) for both cases under luminosity 100e26.

Please find the results here

https://drive.google.com/open?id=0B9JxjGItnv5uSHZJQU1SWmVkQkU  

I believe we can certainly do full GEANT simulation to verify too (takes some longer time). We can iterate with different choices with this method very quickly. Furthermore It should be able to guide us to set the requirement on detector performance parameters for the proposal.

Your comments are appreciated. Best Regards

/xin

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Xin Dong
Nuclear Science Division
Lawrence Berkeley National Lab
MS70R0319, One Cyclotron Road
Berkeley, CA 94720, USA
Tel: +1-510-486-4121
Email: XDong AT lbl.gov
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===========================
Xin Dong
Nuclear Science Division
Lawrence Berkeley National Lab
MS70R0319, One Cyclotron Road
Berkeley, CA 94720, USA
Tel: +1-510-486-4121
Email: XDong AT lbl.gov
===========================