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

RICH upgrade:layout,

housing of the MaPMT,engineering

(excluding the f/e electronics).

Alessandro Petrolinion behalf of many collegues

16 maggio 2013

2Alessandro Petrolini - Dipartimento di Fisica dell’Università di Genova e INFN

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 space

with 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.

16/05/2013

3Alessandro Petrolini - Dipartimento di Fisica dell’Università di Genova e INFN16/05/2013

4Alessandro Petrolini - Dipartimento di Fisica dell’Università di Genova e INFN16/05/2013


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.

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Current RICH1

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New Vertical RICH1

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Existing RICH1 [EDR]

+R=3800mm

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45 cm

Nominal focal plane ofexisting RICH1 [EDR]

58 cm Nominal PD-plane of the upgraded RICH1

Clearance: 10 cm

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Keep sealing to beam-pipeat the same position

Move downstream the spherical mirror

2.50 m

Photon Detectors+

ElectronicsArea

0.5 m

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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.

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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, stretta collaborazione con MIB, FE e PD (+CERN e UK).16/05/2013


Elementary Cell / Photo-Detector Module

The base-board of the Elementary Cell tries tocombine different functions together, including: mechanical supporting structure

for 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)

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Prototype of the EC

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Eight CLARO boards per 4 MaPMT

4 MaPMT + MS

The Base-Board

Digital boards

Alu support

Board2

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

PDM: PRELIMINARY CAD ENGINEERINGNOT TO SCALE – first protoypes do

exist

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Digital boards

Eight CLARO boards per 4 MaPMT

Board2

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

Alu support

4 MaPMT + MS

The Base-Board

PDM: PRELIMINARY CAD ENGINEERINGNOT TO SCALE – first protoypes do

exist

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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, stretta collaborazione con GE (e CERN).

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Short-Term plans

Assemble a full PDM (including readout electronics) for lab testing.

Understand the requirements for the super-structure; start design.

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Alessandro Petrolini - Dipartimento di Fisica dell’Università di Genova e INFN

2016/05/2013

Alessandro Petrolini - Dipartimento di Fisica dell’Università di Genova e INFN

21>460mm

CRANETT support

16/05/2013

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

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