D. Dutta 13th CBM Collaboration Meeting 1 Dipanwita Dutta Much Segmentation Study: A Flexible Scheme

D. Dutta 13th CBM Collaboration Meeting 2  Existing Segmentation Scheme (5% Occupancy)  Flexible Segmentation Scheme –Aim –Plan –Implementation –Examples –Improve coverage near beam pipe –Hit Production  Summary and Future Plan Outline

D. Dutta 13th CBM Collaboration Meeting 3 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  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 Scheme 5% Hit occupancy Central Au+Au 25 AGeV from UrQMD Compact Much Min Pad size 1.4 × 2.8 mm 2

D. Dutta 13th CBM Collaboration Meeting 5 Regio ns Hit Density hit/event/cm 2 PadW(cm)PadL(cm)SecW(cm)SecL(cm) 1> Existing Scheme: Sector and Pad Dimensions

D. Dutta 13th CBM Collaboration Meeting 6 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 Existing Segmentation scheme Station 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 mm 2 – unrealistic

D. Dutta 13th CBM Collaboration Meeting 7 Less Efficiency Less coverage near beam pipe Hit 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 design by 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 Aim: Flexible Segmentation Scheme

D. Dutta 13th CBM Collaboration Meeting 9 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 Plan: Flexible Segmentation Scheme

D. Dutta 13th CBM Collaboration Meeting 10 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

D. Dutta 13th CBM Collaboration Meeting 11  Station: 10,11,12 (after 4 th 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 cm R_ext=124.5 cm Example: Flexible Seg. Scheme (Option1 )

D. Dutta 13th CBM Collaboration Meeting 12 Station: 10,11,12 Station: 10,11,12 (after 4 th absorber) Example: Flexible Seg. Scheme (Option 1) ● MC Points ● Reconstructed Hits

D. Dutta 13th CBM Collaboration Meeting 13 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

D. Dutta 13th CBM Collaboration Meeting 14 Efficiency Improved – by improving the coverage Hit Prod. Efficiency with Flexible Seg. Scheme ( 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. =128 No. of Ch. =64 No. of Ch. =32 Regi ons PadW (cm) PadL (cm) SecW (cm) SecL (cm) SecW (cm) SecL (cm) SecW (cm) SecL (cm) 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 cm 2 (4): 4.43×8.87 cm 2 (5): 8.87×8.87 cm 2 No. of sec: 320 No. of channels: Sec. (3): 2.21×4.43 cm 2 (4): 4.43×4.43 cm 2 (5): 4.43×8.87 cm 2 No. of sec: 628 No. of channels: No. of channel/sec: 64 Sec. (3): 2.21×2.21 cm 2 (4): 2.21×4.43 cm 2 (5): 4.43×4.43 cm 2 No. of sec: 1196 No. of channels : 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 mm 2 Yellow: Reg. 4, Pad: 5.54 × 5.54 mm 2 Magenta: Reg. 5, Pad: 5.54 × mm 2 Example: Flexible Seg. Scheme ( Option 2)

D. Dutta 13th CBM Collaboration Meeting 17 Example: Flexible Seg. Scheme ( Option 2) No. of channel/sec: 16 Sec. (3): 1.11×2.21 cm 2 (4): 2.21×2.21 cm 2 (5): 2.21×4.43 cm 2 No. of sec: 2316 No. of channels: Sec. (3):1.11×1.11 cm 2 (4):1.11×2.21 cm 2 (5): 2.21×2.21 cm 2 No. of sec: 4580 No. of channels: No. of channel/sec: 8 Sec. (3): 0.55×1.11 cm 2 (4): 1.11×1.11 cm 2 (5): 1.11×2.21 cm 2 No. of sec: 9060 No. of channels : No. of channel/sec: 4 Stations : 4, 5, 6 Reg: 3,4,5 Rad: 25, 45 Blue: Reg. 3, Pad: 2.77 × 5.54 mm 2 Yellow: Reg. 4, Pad: 5.54 × 5.54 mm 2 Magenta: Reg. 5, Pad: 5.54 × mm 2

D. Dutta 13th CBM Collaboration Meeting 18 Study of Hit Prod. Efficiency for different digi scheme S/B and Efficiency study required to optimize pad dimension

D. Dutta 13th CBM Collaboration Meeting 19 Hit Production Efficiency 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 mm 2 2.8×5.5 mm 2 5.5×5.5 mm ×11.1 mm 2 5.5×11.1 mm 2 6 times larger and Realistic

D. Dutta 13th CBM Collaboration Meeting 20  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 mm 2 shows good Hit efficiency (3 times larger and realistic pad dimension)   Flexible Segmentation works with hit production and upto reconstructionSummary

D. Dutta 13th CBM Collaboration Meeting 21  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 Future Plan