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Report on ITS Geometry and Material Budget Analysis in ALICE Offline Week

This report summarizes findings from Mario Sitta's presentation during the ALICE Offline Week, focusing on the ITS (Inner Tracking System) geometry status. Key points include confirmation of no overlaps within the ITS, the Savannah bug (#63965) impacting material budgets in SDD layer 4 and SSD layers 5 & 6, and current vs. new implementations of GEANT3 vs. TGeo volumes. The report also outlines modular design aspects, resolution checks for services, overlaps found, and the ongoing to-do list in support structure completion.

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Report on ITS Geometry and Material Budget Analysis in ALICE Offline Week

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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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