Post on 29-Jan-2016
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