MuCh segmentation study

1. MuCh segmentation study Anna Kiseleva Dipanwita Dutta Mikhail Ryzhinskiy

2. Muon simulations • cbmroot release v.APR08 • background: UrQMD central events Au+Au at 25 AGeV • muon magnet • all strips STS • compact MuCh • MuCh hit producer without clusters • L1 (STS) and Lit (MuCh) tracking

3. Standard segmentation < 5% occupancy for central Au+Au collisions at 25 AGeV w/o shielding min pad ~ 4 mm2 max pad ~ 20 cm2 Total number of channels: ~ 440 000

4. Standard scheme (<5% occ.) ███old segmentation scheme ███ implemented in new segmentation procedure

5. Flexibility of MuCh segmentation procedure • size of pads • size of sectors (number of channels) • number of regions • radius of regions sectors R

6. Strategy of study • The same pad size for all detector layers • Increase pad sizes without increasing the reconstructed background • Fix pad size for one detector triplet and increase pads in other triplets without increasing the reconstructed background

7. Segmentation schemes 2. 0.280.28 cm2 22222 33333 3. 0.560.28 cm2

8. Results of track reconstruction (Lit) central Au+Au collisions at 25 AGeV

9. Segmentation schemes 2 ? ? ? ? 3 0.560.28 cm2 0.280.28 cm2 4 0.560.56 cm2 5 1.120.56 cm2

10. Results of track reconstruction (Lit) central Au+Au collisions at 25 AGeV

11. Segmentation schemes 2 3 ? ? ? 4 0.560.56 cm2 0.560.28 cm2 0.280.28 cm2 5 1.120.56 cm2 6 1.121.12 cm2

12. Results of track reconstruction (Lit) central Au+Au collisions at 25 AGeV

13. Segmentation schemes 2 34 ? ? 5 1.120.56 cm2 0.560.56 cm2 0.560.28 cm2 0.280.28 cm2 6 1.121.12 cm2 7 2.241.12 cm2

14. Results of track reconstruction (Lit) central Au+Au collisions at 25 AGeV

15. Segmentation schemes 2 345 ? 1.121.12 cm2 6 1.120.56 cm2 0.560.56 cm2 0.560.28 cm2 0.280.28 cm2 2.241.12 cm2 7 2.242.24 cm2 8

16. Results of track reconstruction (Lit) central Au+Au collisions at 25 AGeV

17. Possible solution 1.121.12 cm2 1.120.56 0.560.56 0.560.28 0.280.28 1 600 000 channels

18. Schemes ███old segmentation scheme new segmentation scheme ███ implemented in new segmentation procedure

19. Segmentations: • old • fix: • size of pads • size of sectors • R of regions • new • new flexible segmentation procedure of Dipa • R of sectors from old standard • size of pads from table

20. Comparison of schemes old segmentation (standard) Nchannels = ~440 000 new segmentation (new standard) Nchannels = ~400 000

21. Results of track reconstruction (Lit) central Au+Au collisions at 25 AGeV

22. Conclusions • Smallest pad size 2.8×2.8 mm2 is sufficient • Number of channels is reduced by 10% with new segmentation scheme

23. Next steps • Continue of segmentation study using new information about possible detector solutions from workgroup meeting • Implementation of detailed detector geometries for different technologies • Test of realistic muon system by LMVM and charmonium simulationsand trigger • Preparation to the MuCh Technical Design Report

24. Detectors with pad readout • Lower limit of pad size. Is 0.280.28 cm2 realistic ? • Variations of pad sizes • Support structure & total size of detector layers • Detectors with pad structure in xy or rφ geometry?

25. Detector technology for last layers • Detector layers 9-15: • position resolution between σ = 3 and 12 mm • additional time measurement • Design including support structure needed for simulations • xy or rφ geometry?

26. Total detector thickness 18 cm