Status report on ICARUS T600 (CNGS-2) D. Gibin (ICARUS Collaboration) SPSC,

Daniele Gibin2 A. Ankowski 1, M. Antonello 2, P. Aprili 3, F. Arneodo 3, B. Baibussinov 4, M. Baldo Ceolin 4, G. Battistoni 5, P. Benetti 6, A. Borio 6, E. Calligarich 6, M. Cambiaghi 6, F. Carbonara 7, F. Cavanna 2, S. Centro 4, A. Cesana 5, K. Cieslik 8, D. B. Cline 17, A. G. Cocco 7, A. Dabrowska 8, R.Dolfini 6, C. Farnese 4, A. Fava 4, A. Ferrari 5, G. Fiorillo 7, S. Galli 2, D. Gibin 4, A. Gigli Berzolari 6,A.Giuliano 9,K.Graczyk 1,S. Gninenko 10, A. Guglielmi 4,C. Juszczak 1, J. Holeczek 11, D. Kielczewska 12, M. Kirsanov 10, J. Kisiel 11, T. Kozlowski 13, N. Krasnikov 10,M. Lantz 5, G. Mannocchi 9, M. Markiewicz 8, Ch. Matthey 17, V. Matveev 10, F. Mauri 6, A. Menegolli 6, G. Meng 4,C. Montanari 6, S. Muraro 5, J. Nowak 1, S. Otwinowski 17, O. Palamara 3, L. Periale 9, G. PianoMortari 2, A. Piazzoli 6, P. Picchi 9, F. Pietropaolo 4, W. Polchlopek 14, M. Posiadala 12, M. Prata 6, P. Przewlocki 13, A. Rappoldi 6,.G. L. Raselli 6, E. Rondio 13, M. Rossella 6, C. Rubbia 3, P. Sala 5, L. Satta 9, D. Scannicchio 6, Y. Seo 17, E. Segreto 3,F. Sergiampietri 15, J. Sobczyk 1, D. Stefan 8, J, Stepaniak 13, R. Sulej 16, M. Szarska 8, M. Terrani 5, G. Trinchero 9, F. Varanini 4, S. Ventura 4, C. Vignoli 6, T. Wachala 8, A. Zalewska 8, K. Zaremba 16 B. Lisowski 17, H. Wang 17, X. Yang 17 1 Wroclaw University of Technology, Wroclaw, Poland 2 Dipartimento di Fisica e INFN, Università di L’Aquila, Via Vetoio, I Laboratori Nazionali del Gran Sasso dell’INFN, Assergi (AQ), Italy 4 Dipartimento di Fisica e INFN, Università di Padova, Via Marzolo 8, I Dipartimento di Fisica e INFN, Università di Milano, Via Caloria 2, I Dipartimento di Fisica Nucleare, Teorica e INFN, Università di Pavia, Via Bassi 6, I Dipartimento di Scienza Fisiche, INFN e Università Federico II, Napoli, Italy 8 H. Niewodniczanski Institute of Nuclear Physics, Krakow, Poland 9 Laboratori Nazionali di Frascati (INFN), Via Fermi 40, I INR RAS, prospekt 60-letiya Oktyabrya 7a, Moscow , Russia 11 University of Silesia, 12 Bankowa st., Katowice, Poland 12 Warsaw Univeristy, Krakowskie Przedmiescie 26/28, Warszawa, Poland 13 A. Soltan Institute for Nuclear Studies, Swierk/Otwock, Poland 14 AGH University of Science and Technology, Al. Mickiewicza 30, Krakow, Poland 15 Dipartimento di Fisica, Università di Pisa, Largo Bruno Pontecorvo 3, I Univeristy of Technology, Pl. Politechniki 1, Warsaw, Polanda 17 Department of Physics and Astronomy, University of California, Los Angeles, USA The ICARUS collaboration

SPSC, Daniele Gibin3 ICARUS T600

SPSC, Daniele Gibin4 completed end of July start Aug. completed ongoing August depending on deliveries (Air Liquide, Stirling) originally foreseen by end 2007 under the responsibility of the ICARUS collaboration Detector inspection and cabling of signal feed-throughs Sensor/PM/monitor cabling and detector closure Cabling, Readout electronics, DAQ & electronic test Vacuum system mounting Pressure tests, leak tests, vacuum pumping Network infrastructures Tests of the connections control room - detector, control room- external labs, … Evacuate the cryostats Cooling down Filling with LN2 and LAr T600 Detector

the T600 top (1st phase) Straight chimneys mounting Extraction of cables/fibers Detector inspections (man-holes) HV feed-throughs mounting Diffusion pipes for LAr (new)

SPSC, Daniele Gibin6 inner detectors Wire chamber mechanics HV system PM light detection system Slow control system Purity monitors

SPSC, Daniele Gibin7 Wire chambers mechanics Movement lock released Visual check of wire integrity, position, spacers  No wire broken Check of wire tension on selected samples  Measurements compatible with nominal values Cleaning Wire chamber mechanics is in perfect conditions  No effects due to transportation and movements The 2 T300 modules are presenting equal characteristics  No effects due to LAr filling in the Pavia run in 2001

SPSC, Daniele Gibin8 HV system Cathode and racetrack holding mechanics Field shape resistors re-mounting and check Electrical continuity check HV feed-through mounting HV system is in perfect conditions  No effects due to transportation

SPSC, Daniele Gibin9 PM light detection system Visual inspection Survey of the PM integrity None broken, electrical connection Check of the TPB coatings on the PM surfaces by means of an UV lamp No visible aging effect, the coating is uniform No difference between the 2 T300 → No problems due to LAr immersion No waste TPB material inside the cryostats Stability & adherence of the shifter coating the PM system was found in good conditions  No effects due to transportation, aging (7 years), cooling and LAr immersion

SPSC, Daniele Gibin10 Slow control system Visual inspection of the installed instrumentation The slow control system was found in good conditions Installation of new LAr point-like level meters (resistive): 1 array composed by 5 sensors per each of the 8 corners of the 2 T300 to measure the max LAr level with redundancy (used during LAr filling and at regime)

SPSC, Daniele Gibin11 Purity monitors Visual inspection of the 12 monitors Cables and fibers extraction from chimneys Check of the resistor chains The purity monitor check was ok 4 end-caps of Faraday cages replaced and 4 photo-cathodes replaced with new GaAs samples 1 monitor of Module n.1 has been shortened (20 cm → 4 cm drift) to provide sensitivity for low lifetimes (5-30  s.)

SPSC, Daniele Gibin12 Activities on the T600 top (2nd phase) Signal feed-throughs in position Feed-through internal cabling “Cross” chimneys mounting Sensor mapping

SPSC, Daniele Gibin13 Electronic rack mounting

SPSC, Daniele Gibin14 T600 detector: present status All the internal auxiliary instrumentation precisely mapped in the 80 chimneys, the feed-through mounting is ongoing. 88 front-end electronic racks (fully instrumented and off-line tested) in their final position on the T600 top. 6 trigger /DAQ control racks + 2 cabinets for detector power supply placed on the top of the service structure. All the “cross” chimneys and signal feed-throughs are mounted. The overall rack connection is ongoing. Overall electronic chain noise test ongoing on the connected racks.

SPSC, Daniele Gibin15 Front end data compression New digital card firmware storing the difference between consecutive samples packaged into 4 bits (±7 ADC# range with overflow handling) → lossless factor 4 gain in size/throughput Tested with a LAr TPC prototype

SPSC, Daniele Gibin16 Electronic tests All crates were previously electrically tested outside New firmware installed to allow data compression Noise and pulse response measurement are ongoing for all the electronic channels. Agreement with design specifications. rms ≈ 1ADC# =1000 e - 96 channels 400  s 56  s

SPSC, Daniele Gibin17 Cryogenics Reliquefaction system (Stirling) Installation of skids, tanks, piping Water cooling, compressed air, … Installation of the control instrumentation, electrical cabinets, cabling Commissioning LN2 and LAr Cryogenics (Air Liquide) Installation of the cold shielding and top floor Installation of the Ar circuit Installation of the external N2 circuit Installation of safety systems and devices Installation of the control instrumentation, electrical cabinets, cabling Installation of the cryogenic liquid unloading station Dry Tests Almost completed Completed end in Sept 08 Completed July 08 Completed July 08 End July 08

SPSC, Daniele Gibin18 Insulation pool closure Invar containment plate Frontal insulation wall External structure Frontal cooling screens

SPSC, Daniele Gibin19 Top screen and insulation assembly Top cooling screens Superinsulaion layers Top insulation mounting Top insulation external welding

SPSC, Daniele Gibin20 Top structure completion Insulation reinforcing structure completion and T600 top floor mounting for racks Reinforced bellow

SPSC, Daniele Gibin21 Service structure completion Structure top

SPSC, Daniele Gibin22 Scheme of the overall cryogenic plant LN2 storage tank LN2 GN2 4 kW unit cryogenerators GN2 LN2 Intermediate LN2 vessels Transfer pumps T600 cooling GAr & LAr recirculation & purification Circulators N2 phase separator (Testing vessel with heater) STIRLING AIR LIQUIDE 50 kW heater To LNGS ventilation

SPSC, Daniele Gibin23 STIRLING construction Cryocoolers (10 units) LAr and LN2 storages Pipes Skid frames

SPSC, Daniele Gibin24 Cryogenic liquid storage LAr and LN2 30 m3 storages in the final position

SPSC, Daniele Gibin25 Compressor skids Skids in position

SPSC, Daniele Gibin26 STIRLING circuit mounting LAr cryocooler Skids, pumps and lines Phase separator Lines April 2008 Valves

SPSC, Daniele Gibin27 Air Liquide circuit mounting LN2 circuits Passive heaters LAr purification systems LAr lines GAr purification systems LN2 pumps

SPSC, Daniele Gibin28 T600 activities: general infrastructures under the responsibility of LNGS  Electricity supply  Ventilation in the ICARUS area  Safety & Control Supervision systems  ICARUS Control room, UPS ethernet  Separation wall  Completion of the Service Structure  T600 top cooling system  Emergency power supply  New “Double” Ventilation System  Water Cooling System End of July 08 Sept. 08 Completed Ongoing Completed Ongoing July 08 September 08 completed

SPSC, Daniele Gibin29 T600 overall plant: present status LAr LN 2 Dewars (30 m 3 )

SPSC, Daniele Gibin30 1.ICARUS detector (external connections) completion:August 08 2.Pressure tests, leak tests, vacuum pumping August 08 3.Tests of read out and electronics August 08 4.AIR LIQUIDE overall plant completion:July 08 5.LNGS infrastructures completion & commissioning: Mains (necessary for STIRLING commissioning)End of July Mains (necessary for STIRLING commissioning)End of July New ventilation (first step)Sept New ventilation (first step)Sept Safety & Control Supervision systems Sept Safety & Control Supervision systems Sept  STIRLING Commissioning (5 weeks):end Sept. Strongly dependent on the power supply availability Strongly dependent on the power supply availability  Delivery of LAr from Air Liquide13 Oct.  T600 start-up, eventually with Cosmic Raysend Oct ? Summarizing: next steps all depending from Industrial support. Collaboration is ready

SPSC, Daniele Gibin31 Conclusions Impressive progress in the T600 installation have been achieved in the last months. The bare detector and the data acquisition are essentially ready now. The T600 plant in the underground laboratory with all required infrastructures has been more complicated and slower than expected, but it is also nearing its completion. Some of the T600 start-up procedures, logistics and authorizations have still to be completed. The actual time-schedule of the T600 operation now is mainly depending on the next progress in the LNGS infrastructures, industrial supplies, contracts, delivery of LAr, logistics and authorizations. The filling of the nearly 700 ton of liquid Argon is now scheduled to start by the middle of October and it should last 2-3 weeks. The detector is expected to operate both with cosmic neutrinos and accelerator beam. Probably the scheduled 2008 beam run may be too late, but important cosmic data will be recorded before the end of 2008.