RICH upgrade: layout, housing of the MaPMT , engineering (excluding the f/e electronics).

1. RICH upgrade:layout,housing of the MaPMT,engineering(excluding the f/e electronics). Alessandro Petrolinion behalf of many collegues 16 maggio 2013

2. RICH layout • Configuration: a new RICH1 plus the current RICH2. • Minimal changes are required to the current RICH1to reduce the high-occupancy ( 30%)which would otherwise make pattern recognition very hard. • A realistic option was developed,which fits into the current perceived constraints: • longer focal length of the spherical mirror(sqrt(2) to get ½ occupancy); • move the PD plane, let it fit into the available spacewith minimal engineering changes; • a perturbation on the current configuration,a safe and well-known scenario, easily extrapolated from construction and years of experience with the current RICH1. Alessandro Petrolini - Dipartimento di Fisica dell’Università di Genova e INFN

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5. Optical performance • Average incidence angle: 2.4 degrees. • About 2.9mm-3.5mm pixel size and: • RMS spot size: 1.11 mm +/- 0.03 mm • Maximum spot size diameter: 3.3 mm. • Beware: many details not optimized yet,first of all the geometrical acceptance. This is a very first exercise: a lot of studies are neededin order to understand all the aspects and detailsand look for improvements and a better optimization. But: it works and it is feasible. Alessandro Petrolini - Dipartimento di Fisica dell’Università di Genova e INFN

6. Current RICH1 Alessandro Petrolini - Dipartimento di Fisica dell’Università di Genova e INFN

7. New Vertical RICH1 Alessandro Petrolini - Dipartimento di Fisica dell’Università di Genova e INFN

8. Existing RICH1 [EDR]+R=3800mm Alessandro Petrolini - Dipartimento di Fisica dell’Università di Genova e INFN

9. Clearance: 10 cm Nominal focal plane ofexisting RICH1 [EDR] 45 cm Nominal PD-plane of the upgraded RICH1 58 cm Alessandro Petrolini - Dipartimento di Fisica dell’Università di Genova e INFN

10. Keep sealing to beam-pipeat the same position Move downstream the spherical mirror 2.50 m Photon Detectors+ElectronicsArea 0.5 m Alessandro Petrolini - Dipartimento di Fisica dell’Università di Genova e INFN

11. Minimal RICH1 modified • Extensive re-use of existing parts:reduce costing, help with time-schedule , profit from past experience. • Already good performance,which might improve with further optimization. • About 1940 MaPMT are required for full coverage of the acceptance. Alessandro Petrolini - Dipartimento di Fisica dell’Università di Genova e INFN

12. Housing of the MaPMTPhoto-Detector assembly • Development of the housing for the MaPMT (Photo-Detector Assembly):modular solution, based on fully autonomous functional units: • Elementary Cell (EC) := atomic fully functional assembly; • Photo-Detector Module (PDM) (a suitable number of EC); • Super-structure (mange groups of PDM with ease of access). • Modular structure, easily adapted/scalable to different options. • All these items have been INFN responsibility for LCHb (RICH2). • Work started in 1998 (stopped in  2005 for the MaPMT option);it was resurrected now, with the choice of the MaPMT. • A lot of work was already done ten years ago. • GE, strettacollaborazione con MIB, FE e PD (+CERN e UK). Alessandro Petrolini - Dipartimento di Fisica dell’Università di Genova e INFN

13. Elementary Cell / Photo-Detector Module • The base-board of the Elementary Cell tries tocombine different functions together, including: • mechanical supporting structurefor the MAPMT and ancillary systems; • electrical connections from/to the MAPMT:readout board, HV, DCS, aob. • HV: voltage divider passive components; • passive thermal dissipation capabilities; • electrical insulation; • magnetic shielding, if needed; • optical adapter, if needed. • A few elementary Cells make one Photo-Detector Module (PDM) Alessandro Petrolini - Dipartimento di Fisica dell’Università di Genova e INFN

14. Prototype of the EC Alessandro Petrolini - Dipartimento di Fisica dell’Università di Genova e INFN

15. PDM: PRELIMINARY CAD ENGINEERINGNOT TO SCALE – first protoypes do exist PDM for 2 base-boards (2×(2×2)) MaPMTOnly 4 MaPMT+MS shown,plus their CLARO boards, plus digital board and full housing for 8 MaPMT 4 MaPMT + MS Eight CLARO boards per 4 MaPMT Alu support Digital boards The Base-Board Board2 Alessandro Petrolini - Dipartimento di Fisica dell’Università di Genova e INFN

16. PDM: PRELIMINARY CAD ENGINEERINGNOT TO SCALE – first protoypes do exist 4 MaPMT + MS PDM for 2 base-boards (2×(2×2)) MaPMTOnly 4 MaPMT+MS shown,plus their CLARO boards, plus digital baord and full housing for 8 MaPMT Eight CLARO boards per 4 MaPMT Board2 The Base-Board Alu support Digital boards Alessandro Petrolini - Dipartimento di Fisica dell’Università di Genova e INFN

17. Super-structure for the MaPMT assembly • Infrastructure for the photo-detector assembly (PD): • Overall mechanics. • Global Thermal and active cooling. • Global Magnetic screening. • Electro-optical cabling. • Accessibility (to be improved for RICH1!) • PD, strettacollaborazione con GE (e CERN). Alessandro Petrolini - Dipartimento di Fisica dell’Università di Genova e INFN

18. Short-Term plans • Assemble a full PDM (including readout electronics) for lab testing. • Understand the requirements for the super-structure; start design. Alessandro Petrolini - Dipartimento di Fisica dell’Università di Genova e INFN

19. SPARE

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21. CRANE TT support >460mm Alessandro Petrolini - Dipartimento di Fisica dell’Università di Genova e INFN