LAV construction: Status and overview Matthew Moulson (Frascati) for the LAV Working Group NA62 Photon-Veto Working Group Meeting CERN, 14 December 2010

LAV construction: LAV construction: Status and overviewStatus and overviewMatthew Moulson (Frascati) for the LAV Working GroupMatthew Moulson (Frascati) for the LAV Working Group

NA62 Photon-Veto Working Group MeetingNA62 Photon-Veto Working Group Meeting

CERN, 14 December 2010CERN, 14 December 2010

LAV construction status – M. Moulson (Frascati) – CERN – 14 December 2010

Summary & timeline from Bruxelles

2

A2 delivered to CERN for test beam at T9 on 05 AugCurrently in storage at B185All transports smooth, no problems

A3 vessel delivered to Frascati 06 AugAll blocks and bananas complete, 1 layer mountedExpect to finish by mid Oct

A4 vessel under constructionExpect delivery end SepAll bananas ready by mid Oct, can begin mounting when A3 ships

A5 vessel delivery planned for end Nov


Optimization of banana cablingOld cabling

New cabling

Signal & HVSignal & HV

Signal, HV & LEDSignal, HV & LED

LEDLED

LEDLED

Signal & HVSignal & HV

“Internal” cabling of bananas:Equalizes apparent cable lengthsFacilitates vessel cabling

Evidence of signal/LED crosstalk at A2 testSeparate signal and LED cables


Cabling optimizations for A3480 cables in A1-A5 (2.2 km)Strong tendency to get unruly!

Cable grille enlarged (40 → 50 cm)Additional TLC used in routingVery good results obtained


Cabling optimizations near flanges

A2A2

A3A3 A3A3Slack at flange exit difficult to handle

Advantages from neater cabling work

Add retaining grill to keep cable slack out of acceptance

Virtually no cable slack in acceptance!


A3 finishing, packing, and shipping

6

A3 rotated to horizontal 26 Nov and closed 27 Nov for final vacuum testLeak tested and pumped down to 2 × 10−5 mbar by afternoon of 29 Nov

Rotated to vertical 29 Nov for final packingVibration and temperature monitored from start of final handling until arrival at CERN

30 Nov 10:4130 Nov 10:41

30 Nov 11:2330 Nov 11:23


A3 transport chronology

7

30 Nov 11:30 Departure from Frascati

30 Nov 13:30 Return to Frascati to rebalance load

30 Nov 14:30 Re-departure from Frascati

30 Nov 19:00 Stopped at Ivrea due to road closing

01 Dec Supposedly stopped at Ivrea all day

02 Dec 09:00 Arrival at Ferney Customs

02 Dec morning Load shifted at EHN1

02 Dec 16:20 Accelerometers dismounted Unloading/rotation at ECN3


A3 transport: Vibration log

8

Accelerometer settingsWarning/alarm thresholds: 1g/3g40 Hz low-pass filter to avoid saturation by low-amplitude road noise

#20208 - fastened to A2No events during entire period on the road!Accelerometer removed during handling at CERN 107 warnings and 1 alarm during accelerometer removal and return trip

#20070 – bolted to truck bedData useless – battery appears to have diedShockLog unit is currently being tested in our laboratory


A3 transport: Temperature log

9

0

5

10

15

20

25

Te

mp

[∘C

]

13:3030 Nov

22:3030 Nov

07:3001 Dec

16:3001 Dec

01:3002 Dec

10:3002 Dec

19:3002 Dec

Mass and insulation do provide some protectionBut, after 2 days in the cold, A3 reached 5∘C


Problems with temperature logging

10

Some evidence of (battery induced?) temperature logging problems

A3 transp. Return transp.

Why a broad band?

1000 s

80 s 900 s


Block inventory and testing

11

3477 total in V. Palladino’s database

2095 inspected(incl. 412 top layer)

1382 not inspected(all from top layer)

225 bad

310 “on hold”criteria too strict?

1560 good 742 processed

818 available

New LabView interface for oven integrated into production chain:Current and rate tests at 3 HV settings, including individual working point

What to do about 1692 blocks of unknown status?

Procedure:1.Temp. HV connector (Burndy)2.Final signal connector w/ adapter3.Normal oven run4.Obtain HV working point5.Rate and current test

• Tests performed for all blocks• Results added to LAV RDB• More than 100 blocks tested so far• No blocks with rates > 10 Hz at

working point


Difficulties with top-layer blocks

12

Very sticky Very sticky residueresidue

Anti-corona Anti-corona resinresin

Anti-coronal resin burned through with desoldering tool (250∘C)

•Toxic fumes•Clogging

Chemical armamentarium to remove glue Chemical armamentarium to remove glue

Acetone Acetone

iPr-OH iPr-OH

Label Label removers removers


Status of block/banana processing

Station Layer 1 Layer 2 Layer 3 Layer 4 Layer 5 Complete

Block type

A3 11 11 11 11 14 100%

A4 13 13 13 13 14 100%

A5 15 15 15 15 15 60%

Bananas with long cables*

2 2 3 3 3

13

A4: All blocks/bananas complete

A5: 60% of blocks/bananas complete84 blocks in bananas18 blocks reinforced

10 Dec10 Dec


Summary & revised timeline

14

A3 vessel delivered to CERN 30 NovSome construction delay from re-optimization of cabling schemeTransport rendered difficult by inclement weather

A4 vessel delivery postponed until 30 NovAll bananas ready since end of Oct2 layers currently mountedExpect to deliver to CERN at end of Jan

A5 vessel construction on scheduleWill take delivery when A4 finishedBananas 60% completeExpect to deliver to CERN mid Mar

A1 should return to Frascati on deadhead leg of A5 transportCannot use (e.g. in synchronization run) without overhaulExpect turnaround by mid May: only slight delay on start of A6


Status of A6-A8 and beyond

15

Recall: A9, A10 same dimensions as A11, but are made of stainless steelA12 has open geometry—design is totally different

Meeting tomorrow (15 Dec) with FantiniFinal A6-A8 design revisionsDefinition of construction scheduleGreen-light purchase of construction materials

Indicative construction dates for A6 vesselConstruction start: first week of Feb 2011Delivery: mid April 2011

A6-A85 layers ∅259 cm

A114 layers∅299 cm

Documents

LAV construction: Status and overview Matthew Moulson (Frascati) for the LAV Working Group NA62 Photon-Veto Working Group Meeting CERN, 14 December 2010