Matthew Moulson (Frascati) for the LAV Working Group

NA62 Photon-Veto Working Group Meeting

CERN, 17 July 2012

LAV construction & installation status

LAV construction status – M. Moulson (Frascati) – Photon Veto WG – CERN – 17 July 2012

A11 construction status

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• Completed and tested 6/7• Rotation and vacuum testing week of 9/7• Full survey with laser tracker 17/7 and 18/7• Shipment scheduled for 24/7 (delivery 25/7)

Leak test: < 2×10−9 mbar∙ℓ/s

LAV construction status – M. Moulson (Frascati) – Photon Veto WG – CERN – 17 July 2012

A11 transport plans

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Shipment with Fasoli scheduled for 24/07 – Delivery to CERN 25/07

A8 transport10 May

Shipping container modified

Outer diameter ~ 3 m

Container width ~ 3.5 m

Width > 3 m = Wide Load

•Need police escort!

•Mount Blanc Tunnel shut down both directions(Approval requested)

LAV construction status – M. Moulson (Frascati) – Photon Veto WG – CERN – 17 July 2012

Status of A9, A10 vessels

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Start-up meeting INFN-Fantini on 9 May at Fantini (Anagni)

Can stainless steel with μ/μ0 = 1.01 be obtained?

Generally suppliers will make no guarantees about μ/μ0

Fantini-INFN tour of proposed suppliers of stainless steel to take measurements of 304L plate stock (plus comparisons 304LN, 316L, etc.)

INFN will investigate if criterion for μ/μ0 can be relaxed

Measurement of μ/μ0 for existing stainless steel segments of blue tube

Average μ/μ0 for 304L plate stock (before working):

1.017 – 1.020

LAV construction status – M. Moulson (Frascati) – Photon Veto WG – CERN – 17 July 2012

Measurements of μ/μ0 for existing tubes

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LAV construction status – M. Moulson (Frascati) – Photon Veto WG – CERN – 17 July 2012

Conclusions: μ/μ0 for existing tubes

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Typical μ/μ0 measurements for tube inside magnet gap (#25)

• Flanges 1,05-1,10

• Tube wall 1,01-1,04

• Supports 1,04-1,10

• Welds 1,60-1,90*

*Also verified that there are no peaks of μ/μ0 on flanges that could suggest the presence of welds

Typical μ/μ0 measurements for adjacent tubes (#24, #27)

• Flanges 1,05-1,10

• Tube wall 1,01-1,30*

*These tubes are made from individual plates welded together. The value of μ/μ0 varies significantly from plate to plate.

LAV construction status – M. Moulson (Frascati) – Photon Veto WG – CERN – 17 July 2012

Status of A9, A10 vessels

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Plate steel for A9 cylinder:•Ordered from Outokumpu (CR)•2 plates, 9 m long, 40 mm thick, 304LN (stabilized in nitrogen)•Characteristically low permeability•Usually very expensive (€17/kg ~ 4× cost of 304L), but highly discounted

Flanges:•Ordered from a foundry near Varese•Forged 304L, to be solubilized after forging to obtain low μ/μ0

•Production will be monitored

200-mm nozzles:•Cut from whole steel on cannon mill, can be solubilized if needed

All material should be delivered by end of Sep 2012A9 vessel delivery: late Jan/early Feb 2013

A10 vessel delivery: late Jun 2013