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ITS Geometry Status Report

ITS Geometry Status Report. Mario Sitta Univ. Piemonte Orientale INFN. ITS overlaps. There are no overlaps in the ITS!. Breaking news. Savannah bug #63965: apparent mismatch between real and simulated material budget Seems to affect SDD layer 4 and SSD layers 5 & 6

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ITS Geometry Status Report

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  1. ITS Geometry Status Report Mario Sitta Univ. Piemonte Orientale INFN

  2. M. Sitta - ALICE Offline Week ITS overlaps • There are no overlaps in the ITS!

  3. M. Sitta - ALICE Offline Week Breaking news • Savannah bug #63965: apparent mismatch between real and simulated material budget • Seems to affect SDD layer 4 and SSD layers 5 & 6 • Under study by both SDD and SSD geometry experts to double check actual and possible missing materials/ elements

  4. M. Sitta - ALICE Offline Week ITS Services: current implementation • GEANT3 volumes • Copper + Carbon • New Aluminum part Side A

  5. M. Sitta - ALICE Offline Week ITS Services: new implementation • TGeo volumes • Support trays and rings: • aluminum+ anticorodal (Al alloy) • precise shapes from blueprints • Services inside trays: • copper, plastics (realistic composition) • approximate shape, but keep total cross section • exception: SPD inox cooling tubes have exact shape Side A

  6. M. Sitta - ALICE Offline Week New ITS Services in ALICE FMD TPC TPC ITS PMD Services on Side A

  7. M. Sitta - ALICE Offline Week The support structure

  8. M. Sitta - ALICE Offline Week SPD Trays

  9. M. Sitta - ALICE Offline Week SDD Trays 11 volumes!

  10. M. Sitta - ALICE Offline Week SSD Trays

  11. M. Sitta - ALICE Offline Week Key elements • Very modular, maximize reuse of similar/equal elements • Fully parametrized • One assembly per element (support, trays), avoid assemblies inside assemblies • Overlap free: • services alone: 100,000 mesh points, 0.000 000 1 resolution check • for the services inside ALICE: 10,000 mesh points, 0.000 01 resolution check

  12. M. Sitta - ALICE Offline Week Overlaps found • With 10,000 mesh points and 1e-05 resolution: • Overlap ov00000: RB26s3/RB26s3TubeM_1 overlapping RB26s3/RB26s3Compensator_1 ovlp=1.33514e-05 • Overlap ov00001: RB24/RB242_1/voRB24CuTubeF_3 overlapping RB24/RB243_1/RB243A_1/RB24B1BellowM_2 ovlp=1.30534e-05

  13. M. Sitta - ALICE Offline Week To-Do list • Complete support structure and trays (“90%” done, missing few details such as nuts, small complement pieces) • Complete service description inside trays (“75%” done, check cable materials and cross sections) • Miniframe still missing • Side C to be done (current status in my private version: SDD completed both trays and services, SPD and SSD services known at same level of Side A, trays infos still missing)

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