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 status – M. Moulson (Frascati) – CERN – 14 December 2010 Summary & timeline from Bruxelles 2 A2 delivered to CERN for test beam at T9 on 05 Aug Currently in storage at B185 All transports smooth, no problems A3 vessel delivered to Frascati 06 Aug All blocks and bananas complete, 1 layer mounted Expect to finish by mid Oct A4 vessel under construction Expect delivery end Sep All bananas ready by mid Oct, can begin mounting when A3 ships A5 vessel delivery planned for end Nov

LAV construction status – M. Moulson (Frascati) – CERN – 14 December 2010 Optimization of banana cabling Old cabling New cabling Signal & HV Signal, HV & LED LED LED Signal & HV “Internal” cabling of bananas: Equalizes apparent cable lengths Facilitates vessel cabling Evidence of signal/LED crosstalk at A2 test Separate signal and LED cables

LAV construction status – M. Moulson (Frascati) – CERN – 14 December 2010 Cabling optimizations for A3 480 cables in A1-A5 (2.2 km) Strong tendency to get unruly! Cable grille enlarged (40 → 50 cm) Additional TLC used in routing Very good results obtained

LAV construction status – M. Moulson (Frascati) – CERN – 14 December 2010 Cabling optimizations near flanges A2 A3 A3 Slack 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!

LAV construction status – M. Moulson (Frascati) – CERN – 14 December 2010 A3 finishing, packing, and shipping 6 A3 rotated to horizontal 26 Nov and closed 27 Nov for final vacuum test Leak tested and pumped down to 2 × 10 −5 mbar by afternoon of 29 Nov Rotated to vertical 29 Nov for final packing Vibration and temperature monitored from start of final handling until arrival at CERN 30 Nov 10:41 30 Nov 11:23

LAV construction status – M. Moulson (Frascati) – CERN – 14 December 2010 A3 transport chronology 7 30 Nov 11:30Departure from Frascati 30 Nov 13:30Return to Frascati to rebalance load 30 Nov 14:30Re-departure from Frascati 30 Nov 19:00Stopped at Ivrea due to road closing 01 DecSupposedly stopped at Ivrea all day 02 Dec 09:00Arrival at Ferney Customs 02 Dec morningLoad shifted at EHN1 02 Dec 16:20Accelerometers dismounted Unloading/rotation at ECN3

LAV construction status – M. Moulson (Frascati) – CERN – 14 December 2010 A3 transport: Vibration log 8 Accelerometer settings Warning/alarm thresholds: 1g/3g 40 Hz low-pass filter to avoid saturation by low-amplitude road noise # fastened to A2 No 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 bed Data useless – battery appears to have died ShockLog unit is currently being tested in our laboratory

LAV construction status – M. Moulson (Frascati) – CERN – 14 December 2010 A3 transport: Temperature log Temp [ ∘ C] 13:30 30 Nov 22:30 30 Nov 07:30 01 Dec 16:30 01 Dec 01:30 02 Dec 10:30 02 Dec 19:30 02 Dec Mass and insulation do provide some protection But, after 2 days in the cold, A3 reached 5 ∘ C

LAV construction status – M. Moulson (Frascati) – CERN – 14 December 2010 Problems with temperature logging 10 Some evidence of (battery induced?) temperature logging problems A3 transp.Return transp. Why a broad band? 1000 s 80 s900 s

LAV construction status – M. Moulson (Frascati) – CERN – 14 December 2010 Block inventory and testing 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/ adapter 3.Normal oven run 4.Obtain HV working point 5.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

LAV construction status – M. Moulson (Frascati) – CERN – 14 December 2010 Difficulties with top-layer blocks 12 Very sticky residue Anti-corona resin Anti-coronal resin burned through with desoldering tool (250 ∘ C) Toxic fumes Clogging Chemical armamentarium to remove glue Acetone iPr-OH Label removers

LAV construction status – M. Moulson (Frascati) – CERN – 14 December 2010 Status of block/banana processing StationLayer 1Layer 2Layer 3Layer 4Layer 5Complete Block type A % A % A515 60% Bananas with long cables* A4: All blocks/bananas complete A5: 60% of blocks/bananas complete 84 blocks in bananas 18 blocks reinforced 10 Dec

LAV construction status – M. Moulson (Frascati) – CERN – 14 December 2010 Summary & revised timeline 14 A3 vessel delivered to CERN 30 Nov Some construction delay from re-optimization of cabling scheme Transport rendered difficult by inclement weather A4 vessel delivery postponed until 30 Nov All bananas ready since end of Oct 2 layers currently mounted Expect to deliver to CERN at end of Jan A5 vessel construction on schedule Will take delivery when A4 finished Bananas 60% complete Expect to deliver to CERN mid Mar A1 should return to Frascati on deadhead leg of A5 transport Cannot use (e.g. in synchronization run) without overhaul Expect turnaround by mid May: only slight delay on start of A6

LAV construction status – M. Moulson (Frascati) – CERN – 14 December 2010 Status of A6-A8 and beyond 15 Recall: A9, A10 same dimensions as A11, but are made of stainless steel A12 has open geometry—design is totally different Meeting tomorrow (15 Dec) with Fantini Final A6-A8 design revisions Definition of construction schedule Green-light purchase of construction materials Indicative construction dates for A6 vessel Construction start: first week of Feb 2011 Delivery: mid April 2011 A6-A8 5 layers ∅ 259 cm A11 4 layers ∅ 299 cm