Matthew Moulson for the LAV Working GroupNA62 Photon-Veto Working Group Meeting

CERN, 01 April 2014

LAV construction & installation status

LAV construction status – M. Moulson (Frascati) – Photon Veto WG – CERN – 01 April 2014

LAV installation: Activity at CERN

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A1-A8 status:• HV & signal cable supports for A6-A7-A8 installed• Measurements taken for HV & signal cable supports for A9-A10-A11• HV recabled A1-A3, with reflected cables• HV cabled for A4-A8• Signal cables for A1-A11 with correct impedance ready• A1-A8 fully tested, about 10 bad channels

Almost certainly loose pins on connectors on vacuum side of flanges

A1-A8 installation work: 7-18 April• 2 physicists + 2 technicians• Installation of FEE boards & signal cabling• Repair and test of problematic channels

A10-A11 installation:• 15-24 May, if missing sections of blue tube finished on time• Delays due to availablity of Stycast resin for interior coating

LAV construction status – M. Moulson (Frascati) – Photon Veto WG – CERN – 01 April 2014

Cable supports for A6-A7-A8

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LAV construction status – M. Moulson (Frascati) – Photon Veto WG – CERN – 01 April 2014

A12 construction status: Fantini

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• Welds between sectors complete: rings ready for milling machine• Some problems with milling machine → small delays• Predicted delivery still 15 April – in time for A12 completion by 1 Aug

LAV construction status – M. Moulson (Frascati) – Photon Veto WG – CERN – 01 April 2014

A12 construction status: Frascati

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Block reinforcement • Completed: 263 blocks glued

Oven • Running continuously: 121 of 256 blocks processed to date

Wrapping & light-tightness testing

• Technique practiced• Blocks will not be wrapped until we are ready

for installation

Block-holding plates • Rough machining done at Pisa• Fine machining in progress at Frascati

Connecting hardware • In progress at Pisa

Laboratory & tooling • New tools for manipulation of wrapped blocks designed and manufactured

• Second cleaning stand to be made—to be used for cleaning and light testing

Shifts at Frascati • Will restart 7 April

LAV construction status – M. Moulson (Frascati) – Photon Veto WG – CERN – 01 April 2014

A12 construction status: Frascati

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263 blocks reinforced – 121 processed in oven before rewrapping

LAV construction status – M. Moulson (Frascati) – Photon Veto WG – CERN – 01 April 2014

Refinements to wrapping technique

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Attempt to speed up and simplfy wrapping procedure and minimize use of PVC tape

Use of cleaning stand to check for light leaks