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Dipanwita Dutta. Much Segmentation Study: A Flexible Scheme. Outline. Existing Segmentation Scheme (5% Occupancy) Flexible Segmentation Scheme Aim Plan Implementation Examples Improve coverage near beam pipe Hit Production Summary and Future Plan. Muon Simulations.

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dipanwita dutta
Dipanwita Dutta

Much Segmentation Study: A Flexible Scheme

13th CBM Collaboration Meeting

slide2

Outline

  • Existing Segmentation Scheme (5% Occupancy)
  • Flexible Segmentation Scheme
    • Aim
    • Plan
    • Implementation
    • Examples
    • Improve coverage near beam pipe
    • Hit Production
  • Summary and Future Plan

13th CBM Collaboration Meeting

muon simulations
Muon 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

13th CBM Collaboration Meeting

slide4

Existing Segmentation Scheme

5% Hit occupancy

Central Au+Au Collision @ 25 AGeV from UrQMD

Compact Much

Min Pad size

1.4 × 2.8 mm2

13th CBM Collaboration Meeting

slide5

Existing Scheme: Sector and Pad Dimensions

13th CBM Collaboration Meeting

slide6

Existing Segmentation scheme

Station 1

Min Pad dimension: 1.4×2.8 mm2 – unrealistic

6 regions, 1, 2, 3, 4, 5, 6

Rad: 13.7,20,28,36,44,52,62.3

1. Based on 5% Occupancy : governed 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

13th CBM Collaboration Meeting

slide7

Hit Production Efficiency

● MC Points

●Reco Hits

Less Efficiency Less coverage near beam pipe

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

13th CBM Collaboration Meeting

slide8

Aim: Flexible Segmentation Scheme

To study the realistic detector designby optimising pad layout

To make the detector design simple

To have flexibility of sector sizes and pad sizes

To get more coverage near the pipe

13th CBM Collaboration Meeting

slide9

Plan: Flexible Segmentation Scheme

Steps:

1. Keep 9 Regions of Diff. Sector sizes

2. Make Flexible Radius for Diff. Regions

3.Flexible No. of Regions

4. Flexible Pad Dimension

5. Flexible Number of Channels

6. Improve coverage near beam pipe

13th CBM Collaboration Meeting

slide10

Implementation: Flexible Seg. Scheme

  • Introduced Option for Different Scheme

(1) Option 0: Original Segmentation Scheme 5% Occupancy

(2) Option 1:Flexible Segmentation Scheme(Dec08 Release)

      • Flexible radius of regions
      • Flexible no. of regions
      • Improved coverage near beam pipe
    • (3) Option 2:Flexible Segmentation Scheme(Recent)
      • Option of variable Channel No. (1→128)
      • Option of variable pad dimension

13th CBM Collaboration Meeting

slide11

Example: Flexible Seg. Scheme (Option1 )

R_int=26.2 cm

R_ext=124.5 cm

  • Station: 10,11,12

(after 4th absorber)

Existing:

Rad .of diff. regions (8,9)

42 cm

Flexible:

Rad .of diff. regions (2,8,9)

Rad [ ]={27,42} //cm

Reg [ ]={2,8,9}

13th CBM Collaboration Meeting

slide12

Example: Flexible Seg. Scheme (Option 1)

● MC Points

●Reconstructed Hits

Station: 10,11,12 (after 4th absorber)

13th CBM Collaboration Meeting

slide13

Improved 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

13th CBM Collaboration Meeting

slide14

Hit Prod. Efficiency with Flexible Seg. Scheme ( Improved coverage)

Std. Seg.

Hit Prod. Eff: ~90%

Improved coverage:

Hit Prod. Eff. ~98%

Efficiency Improved – by improving the coverage

DEC08 Release

13th CBM Collaboration Meeting

slide15

Flexible Segmentation Scheme (Option 2)

Additional Feature: Flexible No. of Channel and Flexible pad dimension

MinPadW

=1.38mm

MinPadL

=2.77mm

minPadWand minPadL and

No. of Channel

is input

13th CBM Collaboration Meeting

slide16

Example: Flexible Seg. Scheme ( Option 2)

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 mm2Yellow:Reg. 4, Pad: 5.54 × 5.54 mm2Magenta: Reg. 5, Pad: 5.54 × 10.08 mm2

No. of channel/sec: 32

No. of channel/sec: 128

No. of channel/sec: 64

Sec. (3): 2.21×2.21 cm2

(4): 2.21×4.43 cm2

(5): 4.43×4.43 cm2No. of sec: 1196

No. of channels : 38272

Sec. (3): 4.43×4.43 cm2

(4): 4.43×8.87 cm2

(5): 8.87×8.87 cm2

No. of sec: 320

No. of channels: 40960

Sec. (3): 2.21×4.43 cm2

(4): 4.43×4.43 cm2

(5): 4.43×8.87 cm2No. of sec: 628

No. of channels: 40192

13th CBM Collaboration Meeting

slide17

Example: Flexible Seg. Scheme ( Option 2)

Blue:Reg. 3, Pad: 2.77 × 5.54 mm2Yellow: Reg. 4, Pad: 5.54 × 5.54 mm2Magenta: Reg. 5, Pad: 5.54 × 10.08 mm2

Stations : 4, 5, 6

Reg: 3,4,5 Rad: 25, 45

No. of channel/sec: 4

No. of channel/sec: 16

No. of channel/sec: 8

Sec. (3): 1.11×2.21 cm2

(4): 2.21×2.21 cm2

(5): 2.21×4.43 cm2

No. of sec: 2316

No. of channels: 37056

Sec. (3): 0.55×1.11 cm2

(4): 1.11×1.11 cm2

(5): 1.11×2.21 cm2

No. of sec: 9060

No. of channels : 36240

Sec. (3):1.11×1.11 cm2

(4):1.11×2.21 cm2

(5): 2.21×2.21 cm2

No. of sec: 4580

No. of channels: 36640

13th CBM Collaboration Meeting

slide18

Study of Hit Prod. Efficiency for different digi scheme

12345

22345

32345

34556

34567

42345

S/B and Efficiency study required to optimize pad dimension

13th CBM Collaboration Meeting

slide19

2.8×5.5 mm2

5.5×5.5 mm2

5.5×11.1 mm2

5.5×11.1 mm2

11.1×11.1 mm2

Hit Production Efficiency

Stat/per event:

Mc. Points:2990

Rc. Hits :2941

Multihits :47

Outside :0.97

Min pad size: 2.8×5.6 mm2

6 times larger and Realistic

34556 seems to be the Mimimum Pad dimensions in stations from Hit Efficiency

13th CBM Collaboration Meeting

slide20

Summary

  • A Flexible Segmentation scheme for Much implemented
    • 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 mm2shows good Hit efficiency (3 times larger and realistic pad dimension)
  • Flexible Segmentation works with hit production and upto reconstruction

13th CBM Collaboration Meeting

slide21

Future Plan

  • Study the realistic digitization with Clustering and Avalanche
  • Optimisation of detector layout for quarkonium

*Thanks for input from A. Kiseleva for this study

Thank you

13th CBM Collaboration Meeting