d. dutta 13th cbm collaboration meeting 1 dipanwita dutta much segmentation study: a flexible scheme

D. Dutta 13th CBM Collaboration Meeting 1

Dipanwita DuttaDipanwita Dutta

Much Segmentation Study: Much Segmentation Study: A Flexible SchemeA Flexible Scheme


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


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


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


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


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


Less Efficiency Less coverage near beam pipe

Hit Production EfficiencyHit Production Efficiency

Hit prod. Efficiency= N hits/N Mc. points

● MC Points

● Reco Hits


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


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


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


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 )


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


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


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


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


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


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


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)


Example: Flexible Seg. Scheme ( Option 2)Example: Flexible Seg. Scheme ( Option 2)


Sec. (3): 1.11×2.21 cm2

(4): 2.21×2.21 cm2

(5): 2.21×4.43 cm2


Sec. (3):1.11×1.11 cm2

(4):1.11×2.21 cm2

(5): 2.21×2.21 cm2



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


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


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


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


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


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

d. dutta 13th cbm collaboration meeting 1 dipanwita dutta much segmentation study: a flexible scheme

Documents

flexible pad dimension5

original segmentation

existing segmentation

existing scheme

flexible number of channels6

different scheme

pad sizesto

pad size1