ephenix forward tracker resolution “study” i n eicroot framework
DESCRIPTION
ePHENIX forward tracker resolution “study” i n EicRoot framework . Alexander Kiselev EIC TF meeting, BNL Sep , 2 6 2013. Contents. ePHENIX surprisingly good fwd tracker resolution “puzzle” Comparison to the dedicated EIC detector ePHENIX realistic resolution plots in EicRoot framework - PowerPoint PPT PresentationTRANSCRIPT
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ePHENIX forward tracker resolution “study”
in EicRoot framework
Alexander KiselevEIC TF meeting, BNL Sep,26 2013
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Sep,26 2013 A.Kiselev
Contents ePHENIX surprisingly good fwd tracker resolution “puzzle” Comparison to the dedicated EIC detector ePHENIX realistic resolution plots in EicRoot framework
Summary
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Sep,26 2013 A.Kiselev
ePHENIX fwd tracker resolution (LoI)
-> expected sp/p as good as ~3% at h = 3.0!
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Sep,26 2013 A.Kiselev
EIC dedicated detector resolutionp+ track momentum resolution vs. pseudo-rapidity
-> basically the same ~2-3% at h = 3.0
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Sep,26 2013 A.Kiselev
EIC dedicated detector support plot #1p+ track momentum resolution at h = 3.0 vs. Silicon thickness
-> material budget matters!
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Sep,26 2013 A.Kiselev
EIC dedicated detector support plot #2p+ track momentum resolution at h = 3.0 vs. Silicon pixel size
-> detector intrinsic resolution matters as well!
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Sep,26 2013 A.Kiselev
ePHENIX detector layout
ePHENIX EIC ratio
XY-planes # 5 8 5:8
Material per plane ~ 0.86% X0 ~ 0.20% X0 ~4 worse
Plane resolution ~ 50mm < 6mm ~8 worse
Magnetic field ~ 1.5T ~ 3.0T ~2 worse
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Sep,26 2013 A.Kiselev
Other design considerations
sp/p (material budget) ~ 1/Lsp/p (intrinsic resolution) ~ 1/L2
well, size also matters …
-> and ePHENIX fwd tracker base (L) is at present ~3 times longer …
(assuming equidistant detector spacing and homogeneous magnetic field)
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Sep,26 2013 A.Kiselev
ePHENIX mock-up in EicRoot 5x XY GEM stations at predefined locations 50 micron gaussian resolution and 0.86% rad.length per plane Either constant 1.5T or real-life BABAR-for-ePHENIX field RICH material: 1.0% rad.length entrance window & ~1m thick CF4
gas volume
p+ tracks
Track fitting using Kalman filter
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Sep,26 2013 A.Kiselev
ePHENIX resolution plot #1
-> so really expect ~10% resolution at 10 GeV/c
1.5T constant field; h = 4.0; check contributions (one change at a time)
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Sep,26 2013 A.Kiselev
ePHENIX resolution plot #2
-> a factor of ~3 difference in B*dl integral matters, clear
1.5T constant field; h = 3.0 vs 4.0
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Sep,26 2013 A.Kiselev
ePHENIX magnetic field map
-> field rapidly falls down beyond ~1.5m from the IP
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Sep,26 2013 A.Kiselev
ePHENIX resolution plot #3
-> real field gives a factor of ~2 worse results
1.5T constant vs realistic field; h = 3.0 & 4.0
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Sep,26 2013 A.Kiselev
ePHENIX resolution plot #4
-> linear term ~0.7% / GeV/c (~matches LoI number)
realistic field; h = 4.0; “sp/p ~ a*p + b” breakdown
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Sep,26 2013 A.Kiselev
Summary ePHENIX LoI momentum resolution numbers for forward
tracker look reasonable (but whether this resolution suffices or not for RICH-based PID at h=4.0 is a different question)
One might want to optimize dedicated EIC detector tracker layout (work started)