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Stato del progetto RICH di LHCb

Stato del progetto RICH di LHCb. CSN1 Napoli, 23 settembre 2005. RICH1: 2-60 GeV/c Major design changes. LHCb RICH detectors. RICH2: 17-100 GeV/c No major changes since RICH TDR. Impegni italiani nei RICH. Genova : Rich2 alloggiamento fotorivelatori

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Stato del progetto RICH di LHCb

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  1. Stato del progetto RICH di LHCb CSN1 Napoli, 23 settembre 2005 CSN1 Napoli 23/09/2005

  2. RICH1: 2-60 GeV/c Major design changes LHCb RICH detectors RICH2: 17-100 GeV/c No major changes since RICH TDR CSN1 Napoli 23/09/2005

  3. Impegni italiani nei RICH • Genova : Rich2 • alloggiamento fotorivelatori • (inclusa trasmissione segnali a L0 e raffreddamento • design e componenti in parte utilizzati anche per Rich1) • ECS Alte Tensioni • Milano: • Rich1 • Aerogel e relativi telai per l’installazione • Rich2 • Elettronica : HV distribution boards • LV distribution boards • Isolamento elettrico mumetal • Schermo magnetico complessivo CSN1 Napoli 23/09/2005

  4. RICH 1 design and construction (2005) RICH1 – Changes since RICH TDR • Addition of Plane Mirrors to allow HPDs to be located where iron shields can be used • 2. Vertical optical layout to allow shields to act as pole pieces for Level-1 trigger field • 3. Reduction of material in LHCb acceptance • Beryllium spherical mirrors • Mirror supports outside acceptance • Eliminate entrance window by sealing to VELO tank • TDR: 14% X0 Now: 7.3% X0 Aerogel • B Shielding, Gas Enclosure, Be Mirrors, Velo Seals PRR’s passed • General assembly tests until Nov.2005 • Gas Enclosure install end 2005 • Beam pipe insertion Apr.2006 • however severe delay on Be mirrors : final delivery end 2006 CSN1 Napoli 23/09/2005

  5. AEROGEL Tile 20.0 x 20.0 x 5.1 cm3 successfully produced in 2004 - 2005 CSN1 Napoli 23/09/2005

  6. AEROGEL • Parameters (A, C, n, Dn) Measured in Milano and Frascati n=1.030 (± 0.001) at =400 nm nominal size 20 x 20 x 5 cm Clarity < 0.0064 m4 cm-1 total dimensions : 720x600 cm to cover acceptance Produced by Novisibirsk T = A e (-C t /l4) The aerogel box (1 of 2) Interface to gas enclosure CSN1 Napoli 23/09/2005

  7. Aerogel Tiles: sequence of installation and final positioning Order for the 2 boxes should go out in few days CSN1 Napoli 23/09/2005

  8. AEROGEL production 5 tiles produced and delivered n = 1,0291 C = 0.0054 m4/cm 20.0 x 20.0 x 5.13 cm3 meas. In Milano:C = 0.0052±0.00007 A = .96 n(543nm) = 1,0288 ±0.00027 n = 1,0301 C = 0.0056 m4/cm 20.0 x 20.0 x 5.08 cm3 n = 1,0308 C = 0.0062 m4/cm 20.0 x 20.0 x 5.14 cm3 n = 1,0301 C = 0.0052 m4/cm 19.9 x 20.0 x 5.14 cm3 n = 1,029 C = 0.0049 m4/cm 19.9 x 19.9 x 5.21 cm3 1. Pre-serie 2. 3. 4. Delivered June 2005 5. CSN1 Napoli 23/09/2005

  9. Plans for production Total amount needed:23 liters 6 tiles 20x20 cm 8 tiles variable size Pre-series production : 6 liters (3 tiles 20x20x5 cm3) july 2004 all within specifications OK Final production : 4 liters received 13 liters 30 september 2005 (on schedule) 6 liters (spare) 31 december 2005 or later PRR took place 31st may 2005 Referees very positive, productioncan go on CSN1 Napoli 23/09/2005

  10. Plans for measurements For each tile : measurement of n (with spectrometer method, and from density) n across the tile with laser beam method (in lab) measurement of T with spectrophotometer (to determine Clarity factor) to prepare a database for the description of the detector For one or two tiles in 2006 (requested): test beam measurement of n, Np.e.,C, K/ separation, edge effects with an array ofpixel HPDs CSN1 Napoli 23/09/2005

  11. Rich2 Status • All systems foreseen • Super Structure • Windows • Central Tube • Overall Magnetic Shielding • Mirror Panels • Spherical Mirrors • Flat Mirrors • Monitoring Systems • are installed and, wherever applicable, aligned. • RICH 2 has been leak tested. • Leak rate is in the very good range of < 5 l/h • To be done in the pit: • Align RICH 2 on the bunker • Check alignment of the optical systems • Install fibres for the monitoring system • Install the quartz plates (are now ordered) • Install photon detector supports • Install back planes and patch panels Rich2 is still not in the pit due to a delay in LHC installations and should be transported in the 1st half of october CSN1 Napoli 23/09/2005

  12. Rich2 Mounted Superstructure with Windows, Side Walls and Photon Funnels Photon Funnel Entrance Window CSN1 Napoli 23/09/2005

  13. Rich2 Status Photodetectors Housing (Genova) • Photodetectors housing completely redesigned since Jan. 2004 due to much larger heat dissipation requirements than initially foreseen : each HPD plane 2kW instead than ~200 W foreseen in the EDR due to much larger dissipation both of pixel chip (~1.8 W/chip) and associated L0 electronics. • To ease cooling electronics PCB’s (L0, HV, LV) are arranged on the same plane differently from the old design, while the general frame design is retained with proper modifications in order to accommodate the electronic boards. • In new design Cu cooling plates with active C6F12 system in order to cool L0 electronics. • Precision positioning of HPD’s and cooling of pixel chips implemented by means of special mounting cup (spacer) together with cold fingers conducting heat to cooled frames where cooling plates are installed. • HPD signal pinout inserted into a ZIF connector mounted on a special PCB (translator) in turn connected to L0 electronics by means of a couple of Flexible (Kapton) Printed Circuits. Proper termination resistors are implemented on the translator PCB CSN1 Napoli 23/09/2005

  14. Rich2 – Photodetectors Housing (Genova)(1) • EVERY DETECTOR PANEL IS MADE OF AN ARRAY OF HPD COLUMNS • AN EXTERNAL FRAME HOUSES 9 COLUMNS • EVERY COLUMN IS AN INDEPENDENT SUB-ASSEMBLY, THAT CAN BE INTRODUCED AND REMOVED WITHOUT AFFECTING THE NEIGHBOURING COLUMNS • THE PANEL FEATURES X/Y/Z (+/- 2 mm) AS WELL AS ROLL AND PITCH ADJUSTEMENTS • RAILS ARE FITTED ON MAGNETIC SHIELD BASE, TO LET THE SHIELD SLIDE INTO POSITION AND ALLOW LONGITUDINAL ADJUSTMENT • PANEL BASE FEATURES LEVELLING SCREWS, TO ADJUST HEIGHT, ROLL AND PITCH • PANEL BASE FEATURES ALSO TRANSVERSE RAILS TO ADJUST TRANSVERSE POSITION CSN1 Napoli 23/09/2005

  15. Rich2 – Photodetectors Housing (Genova)(2) • EVERY COLUMN HOUSES 16 HPDs • EVERY HPD ASSEMBLY (HPD TUBE + MU-METAL SHIELD) IS INTEGRATED ON A SPACER. AN INTERFACE MODULE WITH KAPTON PIGTAILS CONNECTS THE TUBE TO L0 BOARD • A COOLING PLATE IS FITTED ON ONE SIDE OF THE COLUMN • L0, LV AND HV BOARDS ARE ARRANGED “IN-LINE” BEHIND HPD ASSEMBLIES • Mechanical Construction in well advanced state • Mechanical components mostly built by INFN Genova Workshop (apart from some series production highly repetitive items) • Complete mechanical assembling test foreseen in Genoa in the next 2 weeks before shipment to CERN Translator with ZIF Socket to HPD Kapton Flexies CSN1 Napoli 23/09/2005 same type of installation with same components foreseen for Rich 1

  16. Rich2 – Photodetectors Housing (Genova) (3) 89.5 mm 89.5 mm • HPD PITCH INCREASED FROM 87 TO 89.5 mm (ACCURACY ISSUES) • HPD SPACER OUT OF ALUMINIUM, INSTEAD OF GF NYLON (COOLING ISSUES) • KAPTONS TO LINK HPD TO L0 BOARD, INSTEAD OF FLAT TWISTED PAIR • COOLING FINGER ON HPD SPACER TO DIRECTLY COOL HPD CARRIER (OPTION), INSTEAD OF NATURAL AIR DRAFT • SIMPLIFIED SUPPORTING FRAME ASSEMBLY: ONLY ONE FRAME • A COOLING PLATE HAS BEEN ADDED, TO DIRECTLY COOL THE ELECTRONICS • ALL THE SERVICES (EXCEPT COOLANT FEED) ACCESS THE DETECTOR PLANE FROM THE TOP • “IN-LINE” ARRANGEMENT OF THE BOARDS Cooling Details CSN1 Napoli 23/09/2005 Cooling Plates

  17. Rich2 – Photodetectors Housing (Genova) (4) COOLING PLATE PRODUCTION (July-Sep. ’05) CSN1 Napoli 23/09/2005

  18. ECS Alte Tensioni (Genova) • Sistema alimentazione alte tensioni HPD realizzato mediante alimentatori ISEG (1 per colonna) a 20kV • Comando e monitoraggio alimentatori ISEG realizzato mediante segnali analogici BT (0-5V) • Necessaria realizzazione interfacciamento con bus previsti dal sistema ECS • Interfacciamento a ECS realizzato mediante linea Ethernet e tecnologia CC-PC Glue-Card sviluppata a Genova per tutto LHCb • In corso di prototipazione scheda madre con CC-PC/Glue-Card interfacciata a schede figlie con convertitori A/D e D/A mediante bus I2C Si prevede prototipo pronto nel 10 trimestre 2006 CSN1 Napoli 23/09/2005

  19. HV BOARDS (Milano) A B C A -20 kV B -19.7 kV C -16.4 kV Half Column Arrangement 5G CSN1 Napoli 23/09/2005

  20. LV_Board A LV_Board B LV_Board B LV_Board B LV Distribution (Milano) CSN1 Napoli 23/09/2005

  21. RICH 2 Statusmagnetic shield and measurement(Milano) Magnetic field (gauss) measured at HPD focal plane Magnetic shield tested with LHCb magnet

  22. Schermo magnetico HPD (Milano)Matrice di schermi Campo magnetico generato da opportune bobine di Helmholz in modo da simulare il campo magnetico all’interno degli schermi magnetici complessivi del Rich2 (V. trasp. precedente) Misure di campo all’interno di una matrice di schermi di m-metal in cui saranno inseriti gli HPD Campo assiale Campo trasverso CSN1 Napoli 23/09/2005

  23. shield at ground Mumetal shield insulation(Milano) reliable insulation stable as thin as possible for close packing and optimal coverage over the experiment lifetime needed Mumetal shield 760 micron thick Polyester film 3x125 micron wrapped around 20kV operation 25 mm -20 kV bulk discharges as well as high surface currents, coronas, have to be avoided insulation CSN1 Napoli 23/09/2005

  24. HV Scheduling • Before end of October 2005: final prototypes for PRR and December/January system test/ beam test; • Spring 2006: full board production (at least for RICH2). The assembling and test will start and follow. LV Distribution Scheduling • September 2005: finish testing of the last prototype at CERN. • October-November 2005: production of two columns of the final version of LV distribution for Test beam/full column test foreseen at the end of the year. • Spring 2006: full board production. The assembling and test will follow. CSN1 Napoli 23/09/2005

  25. HPD status HPD production (DEP) • 550 tubes (484 + spares) required + 50 optional tubes • Contract signed for 485 tubes only + additional option HPD production status • HPD production is recently underway • 8 tubes delivered on 30th June; QE values within specification • Another 7 tubes to be delivered this week to CERN • All subsequent tubes to be delivered to Edinburgh/ Glasgow Anode assemblies • DEP now have ~100 anode assemblies to work with • Further 120 anode parts sent to HCM this week for packaging • Gold plating problems @CERN solved – but incurred 2 months delay Bump-bonding • Two batches (200 + 300) assemblies received from VTT • ~80% yield • VTT (final) batch 3 (300 assemblies) by end of this year Next batch of HPDs (7) to be sent to CERN. The next batch (initially ~ 6-7) of tubes sent to test stations end September. CSN1 Napoli 23/09/2005

  26. Spare Slides CSN1 Napoli 23/09/2005

  27. Rich2 Status - Mirrors Spherical Mirrors: array of hexagonal mirrors dcirc = 510 mm subs. thick’ss = 6 mm R0 = 8600 mm 0.5% Flat Mirrors: array of flat mirrors (R=~50 m) rectangular in shape dcirc = 559 mm Mirrors in Simax Glass manufactured by the Compass - Czech Firm Quality check for spherical mirrors produced D0 = diam. of smallest circle containing 95%of reflected light required D0 2.0 mm CSN1 Napoli 23/09/2005

  28. RICH 2Status mirror alignment (surface,pit,data) CSN1 Napoli 23/09/2005

  29. Rich Photodetectors bird’s eye view on some recent HPD performance measurements (1) 40 MHz prototypes QE curves CSN1 Napoli 23/09/2005

  30. CSN1 Napoli 23/09/2005

  31. Rich Photodetectors bird’s eye view on some recent HPD performance measurements (2) • Efficiency Measurements • Timing scans (e.g. timewalk effects for different strobes (25/50 ns) • Comparisons between detection efficiencies 25 and 50 ns strobes • Detection efficiencies for different cathode HV’s • Reflection Measurements • light reflection in quartz window • light reflection on internal HPD structure (silicon, electrodes,etc.) CSN1 Napoli 23/09/2005

  32. Rivelatori RICH di LHCb Identificazione delle particelle su intervallo 1 – 100 GeV/c mediante 2 rivelatori RICH Causata da : richieste per miglioramento livello trigger L1 ( = 0.15 Tm nella regione di “tracking”) Riduzione materiale nella accettanzadello Spettrometro RICH1: riprogettazione completa come da nuovo TDR LHcb light EDR presentato il 31/8 /04 RICH2: SOVRASTRUTTURA Essenzialmente come da TDR originario dei Rich INSTALLAZIONE DEI FOTORIVELATORI modificata Sovrastruttura costruita Finestre di ingresso e uscita installate Photon Funnel installati Specchi in Vetro installati Beam Pipe installata In attesa di essere calato in P8 CSN1 Napoli 23/09/2005

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