d. dutta 13th cbm collaboration meeting 1 dipanwita dutta much segmentation study: a flexible scheme
Post on 20-Jan-2016
224 Views
Preview:
TRANSCRIPT
D. Dutta 13th CBM Collaboration Meeting 1
Dipanwita DuttaDipanwita Dutta
Much Segmentation Study: Much Segmentation Study: A Flexible SchemeA Flexible Scheme
D. Dutta 13th CBM Collaboration Meeting 2
Existing Segmentation Scheme (5% Occupancy)Existing Segmentation Scheme (5% Occupancy)
Flexible Segmentation SchemeFlexible Segmentation Scheme– AimAim– PlanPlan– ImplementationImplementation– Examples Examples – Improve coverage near beam pipeImprove coverage near beam pipe– Hit Production Hit Production
Summary and Future PlanSummary and Future Plan
OutlineOutline
D. Dutta 13th CBM Collaboration Meeting 3
Muon SimulationsMuon Simulations cbmroot release
v.APR08 UrQMD central
events Au+Au at 25 AGeV
all strips STS compact MuCh
5 iron absorber (125cm)
15 MuCh stations
MuCh hit producer without clusters
L1 (STS) and LiT (MuCh) tracking
cbmroot release v.APR08
UrQMD central events Au+Au at 25 AGeV
all strips STS compact MuCh
5 iron absorber (125cm)
15 MuCh stations
MuCh hit producer without clusters
L1 (STS) and LiT (MuCh) tracking
D. Dutta 13th CBM Collaboration Meeting 4
Existing Segmentation Existing Segmentation Scheme Scheme
5% Hit occupancy
Central Au+Au Collision @ 25 AGeV from UrQMD
Compact Much
Min Pad size1.4 × 2.8 mm2
D. Dutta 13th CBM Collaboration Meeting 5
RegioRegionsns
Hit DensityHit Densityhit/event/cmhit/event/cm22
PadWPadW(cm)(cm)
PadLPadL(cm)(cm)
SecWSecW(cm)(cm)
SecLSecL(cm)(cm)
1 >0.4 0.138 0.277 2.217 2.217
2 0.2-0.4 0.277 0.277 2.217 4.434
3 0.1-0.2 0.277 0.554 4.434 4.434
4 0.05-0.1 0.554 0.554 4.434 8.868
5 0.025-0.5 0.554 1.108 8.868 8.868
6 0.01-0.025 1.108 1.108 8.868 17.74
7 0.005-0.01 1.108 2.217 17.74 17.74
8 0.0025-0.005 2.217 2.217 17.74 35.43
9 0.001-0.0025 2.217 4.434 35.43 35.43
Existing Scheme: Sector and Pad DimensionsExisting Scheme: Sector and Pad Dimensions
D. Dutta 13th CBM Collaboration Meeting 6
1. Based on 5% Occupancy : 1. Based on 5% Occupancy : governed by Hit Densitygoverned by Hit Density
2. Define 9 Regions of different Sector sizes
3. Sector as well as pad dim. doubled seq.
4. Each Sector is having 128 channels
5. Start region number for each Station Triplet depends on the hit density
6. The radius vector of different regions is defined from HDensity histogram
Existing Segmentation schemeExisting Segmentation schemeStation 1
6 regions, 1, 2, 3, 4, 5, 6
Rad: 13.7,20,28,36,44,52,62.3
Min Pad dimension: 1.4×2.8 mm2 – unrealistic
D. Dutta 13th CBM Collaboration Meeting 7
Less Efficiency Less coverage near beam pipe
Hit Production EfficiencyHit Production Efficiency
Hit prod. Efficiency= N hits/N Mc. points
● MC Points
● Reco Hits
D. Dutta 13th CBM Collaboration Meeting 8
To study the realistic detector To study the realistic detector designdesign by optimising pad layoutby optimising pad layout
To make the detector design To make the detector design simplesimple
To have flexibility of sector sizes To have flexibility of sector sizes and pad sizesand pad sizes
To get more coverage near the To get more coverage near the pipepipe
Aim: Flexible Segmentation SchemeAim: Flexible Segmentation Scheme
D. Dutta 13th CBM Collaboration Meeting 9
Steps:Steps:1. Keep 9 Regions of Diff. Sector sizes1. Keep 9 Regions of Diff. Sector sizes
2. Make Flexible Radius for Diff. Regions2. Make Flexible Radius for Diff. Regions
3.3. Flexible No. of Regions Flexible No. of Regions
4. Flexible Pad Dimension4. Flexible Pad Dimension
5. Flexible Number of Channels5. Flexible Number of Channels
6. Improve coverage near beam pipe6. Improve coverage near beam pipe
Plan: Flexible Segmentation SchemePlan: Flexible Segmentation Scheme
D. Dutta 13th CBM Collaboration Meeting 10
Implementation: Implementation: Flexible Seg. SchemeFlexible Seg. Scheme Introduced Option for Different Scheme (1) Option 0: Original Segmentation
Scheme 5% Occupancy (2) Option 1:(2) Option 1: Flexible Segmentation Flexible Segmentation
SchemeScheme (Dec08 Release)(Dec08 Release)Flexible radius of regionsFlexible no. of regionsImproved coverage near beam pipe
(3) Option 2:(3) Option 2: Flexible Segmentation Flexible Segmentation SchemeScheme (Recent)(Recent)
Option of variable Channel No. (1→128) Option of variable pad dimension
D. Dutta 13th CBM Collaboration Meeting 11
Station: 10,11,12Station: 10,11,12 (after 4th absorber)
Existing:Existing: Rad .of diff. regions (8,9)
42 cm Flexible:Flexible: Rad .of diff. regions (2,8,9) Rad [ ]={27,42} //cm Reg [ ]={2,8,9}
R_int=26.2 cmR_ext=124.5 cm
Example: Flexible Seg. Scheme (Option1 )Example: Flexible Seg. Scheme (Option1 )
D. Dutta 13th CBM Collaboration Meeting 12
Station: 10,11,12 Station: 10,11,12 (after 4th absorber)
Example: Flexible Seg. Scheme (Option 1)Example: Flexible Seg. Scheme (Option 1)
● MC Points
● Reconstructed Hits
D. Dutta 13th CBM Collaboration Meeting 13
Improved Coverage: Flexible Seg SchemeImproved Coverage: Flexible Seg Scheme
Allow Sectors inside the Beam Pipe
•To remove the efficiency loss due to less coverage near the beam pipe • Implemented for optimization of pad size
D. Dutta 13th CBM Collaboration Meeting 14
Efficiency Improved – by improving the coverage
Hit Prod. Efficiency with Flexible Seg. Scheme Hit Prod. Efficiency with Flexible Seg. Scheme ( Improved coverage)( Improved coverage)
Std. Seg.
Hit Prod. Eff: ~90%
Improved coverage:
Hit Prod. Eff. ~98%
DEC08 Release
D. Dutta 13th CBM Collaboration Meeting 15
No. of Ch. =128No. of Ch. =128 No. of Ch. =64No. of Ch. =64 No. of Ch. =32No. of Ch. =32
Regions
PadW(cm)
PadL(cm)
SecW(cm)
SecL(cm)
SecW(cm)
SecL(cm)
SecW(cm)
SecL(cm)
1 0.138 0.277 2.217 2.217 1.108 2.217 1.108 1.108
2 0.277 0.277 2.217 4.434 2.217 2.217 1.108 2.217
3 0.277 0.554 4.434 4.434 2.217 4.434 2.217 2.217
4 0.554 0.554 4.434 8.868 4.434 4.434 2.217 4.434
5 0.554 1.108 8.868 8.868 4.434 8.868 4.434 4.434
6 1.108 1.108 8.868 17.74 8.868 8.868 4.434 8.868
7 1.108 2.217 17.74 17.74 8.868 17.74 8.868 8.868
8 2.217 2.217 17.74 35.43 17.74 17.74 8.868 17.74
9 2.217 4.434 35.43 35.43 17.74 35.43 17.74 17.74
Flexible Segmentation Scheme (Option 2)Flexible Segmentation Scheme (Option 2)
MinPadW
=1.38mm
MinPadL
=2.77mm
minPadW and minPadL and
No. of Channel
is input
Additional Feature: Flexible No. of Channel and Flexible pad dimension
D. Dutta 13th CBM Collaboration Meeting 16
No. of channel/sec: 128
Sec. (3): 4.43×4.43 cm2
(4): 4.43×8.87 cm2
(5): 8.87×8.87 cm2
No. of sec: 320No. of channels: 40960
Sec. (3): 2.21×4.43 cm2
(4): 4.43×4.43 cm2
(5): 4.43×8.87 cm2 No. of sec: 628No. of channels: 40192
No. of channel/sec: 64
Sec. (3): 2.21×2.21 cm2
(4): 2.21×4.43 cm2
(5): 4.43×4.43 cm2 No. of sec: 1196No. of channels : 38272
No. of channel/sec: 32
Stations : 1, 2, 3
Reg: 3,4,5 Rad: 25,45
r_int=13.7, r_ext=62.3 cm
Blue: Reg. 3, Pad: 2.77 × 5.54 mm2 Yellow: Reg. 4, Pad: 5.54 × 5.54 mm2 Magenta: Reg. 5, Pad: 5.54 × 10.08 mm2
Example: Flexible Seg. Scheme ( Option 2)Example: Flexible Seg. Scheme ( Option 2)
D. Dutta 13th CBM Collaboration Meeting 17
Example: Flexible Seg. Scheme ( Option 2)Example: Flexible Seg. Scheme ( Option 2)
No. of channel/sec: 16
Sec. (3): 1.11×2.21 cm2
(4): 2.21×2.21 cm2
(5): 2.21×4.43 cm2
No. of sec: 2316No. of channels: 37056
Sec. (3):1.11×1.11 cm2
(4):1.11×2.21 cm2
(5): 2.21×2.21 cm2
No. of sec: 4580No. of channels: 36640
No. of channel/sec: 8
Sec. (3): 0.55×1.11 cm2
(4): 1.11×1.11 cm2
(5): 1.11×2.21 cm2
No. of sec: 9060No. of channels : 36240
No. of channel/sec: 4
Stations : 4, 5, 6
Reg: 3,4,5 Rad: 25, 45
Blue: Reg. 3, Pad: 2.77 × 5.54 mm2 Yellow: Reg. 4, Pad: 5.54 × 5.54 mm2 Magenta: Reg. 5, Pad: 5.54 × 10.08 mm2
D. Dutta 13th CBM Collaboration Meeting 18
Study of Hit Prod. Efficiency Study of Hit Prod. Efficiency for different digi schemefor different digi scheme
12345
22345
42345
32345
34567
34556
S/B and Efficiency study required to optimize pad dimension
D. Dutta 13th CBM Collaboration Meeting 19
Hit Production Efficiency Hit Production Efficiency
34556 seems to be the Mimimum Pad dimensions in stations from Hit Efficiency
Stat/per event:
Mc. Points:2990
Rc. Hits :2941
Multihits :47
Outside :0.97
Min pad size: 2.8×5.6 mm2
2.8×5.5 mm2
5.5×5.5 mm2
11.1×11.1 mm2
5.5×11.1 mm2
5.5×11.1 mm2
6 times larger and Realistic
D. Dutta 13th CBM Collaboration Meeting 20
A Flexible Segmentation scheme for Much A Flexible Segmentation scheme for Much implementedimplemented
– Flexibility in radius of different region
– Flexibility in number of regions
– Flexibility in No. of Channels
– Flexibility in pad dimension
Improved coverage near beam pipe
Min. pad dimension 2.8×5.6 mm2 shows good Hit efficiency (3 times larger and realistic pad dimension)
Flexible Segmentation works with hit production and upto reconstruction
SummarySummary
D. Dutta 13th CBM Collaboration Meeting 21
Study the realistic digitization with Clustering Study the realistic digitization with Clustering and Avalanche and Avalanche
Optimisation of detector layout for quarkonium Optimisation of detector layout for quarkonium
**Thanks for input from A. Kiseleva for this studyThanks for input from A. Kiseleva for this study
Thank youThank you
Future PlanFuture Plan
top related