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GLAST:Gamma Ray Large Area Telescope

GLAST:Gamma Ray Large Area Telescope. GLAST-Italy: Participation to the LAT, construction commitments and preparation R.Bellazzini Italian Project Manager. Bari (9) Perugia (4) Pisa (9). Roma 2 (2) Trieste/Ferrara (3) Udine (3). Collaborations.

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GLAST:Gamma Ray Large Area Telescope

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  1. GLAST:Gamma Ray Large Area Telescope GLAST-Italy: Participation to the LAT, construction commitments and preparation R.Bellazzini Italian Project Manager 1 IDT - 12/06/01

  2. Bari (9) Perugia (4) Pisa (9) Roma 2 (2) Trieste/Ferrara (3) Udine (3) Collaborations Dipartimento di Ingegneria Aerospaziale (Univ. Pisa) Dipartimento di Ingegneria dei Materiali (Univ. Perugia) INFN Collaboration INFN sections 30 FTE physicists 2 IDT - 12/06/01

  3. Status of INFN approval process Construction money ceiling (INFN+ASI) of 20 GL ˜ 9.5 M$ INFN is willing to approve 3 IDT - 12/06/01

  4. GLAST: MoA …... and ASI and ASI …... 4 IDT - 12/06/01

  5. TKR Flight-Tower Design & Assembly Tower Structure (walls, fasteners) Engineering: SLAC, Hytec Procurement: SLAC SSD Procurement, Testing Japan, Italy, SLAC SSD Ladder Assembly Italy 10,368 Tower Assembly and Test SLAC (2) Italy (16) 2592 Tray Assembly and Test Italy 342 18 Electronics Design, Fabrication & Test UCSC, SLAC 342 Composite Panel & Converters Engineering: SLAC, Hytec, and Italy Procurement: Italy Cable Plant UCSC 5 IDT - 12/06/01 648

  6. Tracker Assembly • Detector ladders (2592 + spares): • SSD production monitoring: Hiroshima • Edge bond SSDs, wire bond, test, encapsulate wires: 2 Italian lines • Electronics multi-chip readout modules (648 + spares): • Standard chip-on-board industrial technology (quote from Teledyne) • Test/burn-in equipment and procedures supplied by UCSC • Carbon-composite panels (342 + spares): • Fabricate in Italian industry • Includes converter foils and SSD bias circuits • Tray assembly in 2 Italian lines (342 + spares): • Precision mounting of 4 ladders on each face • Attach electronics boards • Wire bond the electronics to the detectors, test, and encapsulate • Tower assembly (2 at SLAC and 16 in Italy): • Stack 19 trays • Attach readout cables and sidewalls • Testing with the calibration system and with cosmic muons 6 IDT - 12/06/01

  7. Prototyping of the GLAST SSD Preserie HPK detector on 6’’ wafer Gained experience with a large number of SSD (~5% of GLAST needs) Additional Prototypes: Micron (UK), STM (Italy), CSEM (Switzerland) 7 IDT - 12/06/01

  8. Sensors: on-going activities • Qualification of sensor Suppliers: • complete set of measurements on pre-serie prototypes from • various suppliers ( HPK-Japan, ST-Italy ): • inter-strip capacitance, bulk capacitance, depletion voltage, dark current, decoupling capacitance and resistance, ... • Definition of automatic test procedures for mass production 8 IDT - 12/06/01

  9. Tests on preserie of final HPK SSD Comparison between HPK and GLAST results Measurements at Hiroshima U. (20), INFN-Pisa (10), SLAC (5) 9 IDT - 12/06/01

  10. Average tilt Planarity Tests on preserie of final HPK SSD Mechanics and dimension measurements Thickness Strip size = 64 ± 1 mm Pitch = 228.01 ± 0.01 mm Active width = 87557 ± 5 mm 10 IDT - 12/06/01

  11. Tests with analog electronics Hamamatsu SSD (10 cm long, 400 mm thick) 11 IDT - 12/06/01

  12. Tests with analog electronics ST SSD (10 cm long, 500 mm thick) 12 IDT - 12/06/01

  13. Tests on HPK and ST SSD 13 IDT - 12/06/01

  14. Mechanics: on-going activities • I - Ladders: • Design and production of jiigs and tools for ladders assembly • Definition of alignment and glueing procedure of ladders on trays • Ladders prototyping in collaboration with industries (G&A, MIPOT, LABEN) 14 IDT - 12/06/01

  15. Ladder assembly Alignment Glueing 15 IDT - 12/06/01

  16. Ladder assembly Transfer bridge Service box for bonding 16 IDT - 12/06/01

  17. Alignment of ladders prototype 17 IDT - 12/06/01

  18. Mechanics: on-going activities • II - Trays: • Super-GLAST payload definition and prototyping (PLYFORM) • Definition of trays acceptance mechanical tests • Construction of 4 trays fully equipped with final sensors and electronics 18 IDT - 12/06/01

  19. T (°C) 56 h 50 -30 t 12 h 16 h 12 h 16 h FEA simulation of thermal cycles • temperature range: -30°C +50°C; • numberof cycles: 4; • 12 hr @ -30 °C • (dT/dt) 5 °C/hr; • 12 hr @ +50 °C • estimated duration : 56 hr / cycle / tray GEVS & LAT req. • Strain gauges: • Resistance: 120 W, Gauge Factor: 2,07; • Configuration:1/4 Wheatstone bridge; 19 IDT - 12/06/01

  20. Sine sweep (independently on x,y,z): • Normal modes search (>500Hz); • Range: 10  2000 Hz; • Amplitude: 0.25 g  0.5g; • Frequency scan velocity: 2 4 oct / min; • Test duration : ~ 1 min. Random vibration (independently on x,y,z): • Range: 20  2000 Hz • Notching at normal modes frequencies • Duration: few minutes FEA simulation of vibrational cycles max (seq)rms 4MPa (at tray centre) max (Uz)rms 160mm (at tray centre) Control accelerometer 20 IDT - 12/06/01

  21. Tray mechanics • 4 mockup of SuperGLAST trays have been produced by Plyform • Sandwich dim 360x360 mm, in carbon UD with epossidic matrix, • polimerization temperature 180°C, 4 layers 0 90 90 0, type: • 985 T300 145gr/mq • Honeycomb in Al 5056 perforatated type: • 5056 3/16 .002 th. 25.4 mm. • Structural adhesive in film type: • Redux 312 UL • Close-out in carbon fibre tissue C-shaped with Al angular inserts • Converter plates in Tungsten 18%Xo • Bias circuits in G10 or Kapton 200mm thick • Next activities: • -test in climatic chamber (Terni) • -vibrational tests (Centrotecnica - Milano) • 4-6 mockup trays will be produced by Plyform with: • the final face-sheets -YSH-50/CE 4 layers (GLAST) or 6 layers (super GLAST) • Carbon-fibre M60 close-out, • 3/8” honeycomb 27.9mm thick • Prototype tower assembly jig will be produced in Pisa 21 IDT - 12/06/01

  22. SuperGLAST tray 22 IDT - 12/06/01

  23. GLAST tray prototype • Honeycomb: 3/8”,Al • Face sheet: T300 • Circuit:Kapton/Vetronite • Converter:Tungstane Converter Circuit Honeycomb Face sheet Si glueing spot simplified close-out Circuit 23 IDT - 12/06/01

  24. Placement of ladders on trays – 1st exercise 24 IDT - 12/06/01

  25. Placement of ladders on trays – 1st exercise 25 IDT - 12/06/01

  26. Trays tests with GLAST electronics Gain and noise measurement Average strip occupancy vs injected charge Injected charge vs threshold One layer (36 cm long) of a tray of the BTEM prototype tower Average strip occupancy vs threshold 1 mip ~ 30000 e- 26 IDT - 12/06/01

  27. Tests with GLAST electronics Noise Occupancy with threshold @ 60 mV and @ 150 mV (~ 5s working conditions!) Measurements on one layer of a Tray of the BTEM prototype tower (only 3 ladders on tray) 27 IDT - 12/06/01

  28. Tests with GLAST electronics Source profile at different positions ToT hits distribution Measurements on one layer of a tray of the BTEM prototype tower. The ‘self-triggering’ capability of GLAST electronics is used. b source filtered by two Pb layers (~5% X0) 28 IDT - 12/06/01

  29. Mechanics: on-going activities • III - Towers: • Construction of a tower Engineering Model (19 trays) for qualification of procedures and industrial partners 29 IDT - 12/06/01

  30. Tower Assembly Jig SLOT TRAYS STOP-PIN PIN SLOT SIDE WALL PIN GLAST GLAST GLAST 30 IDT - 12/06/01

  31. Warning: the duration of the test is only approximate and will be fixed in accordance with the facility characteristics Qualification a1=1.25 a2=1.4 (Shock) Acceptance a1=a2=1 • Dynamic • Facility: Shaker • Test: • Sine Sweep • Random vibration • Mechanical Shock • Duration:  10 min Thermal vacuum • Facility: thermal & vacuum chambers (10-5 Torr) • Test: -30°C +50°C • Duration: 160 hr /Tray • Static Load • Facility: Centrifuge • Test: ±12 g a1 on secondary structure applied to each axis independently • Duration: ??? Space Tests 31 IDT - 12/06/01

  32. Space tests: trays dynamic (sine sweep/random vibration) Qualification (USA) thermal • dynamic (random vibration): • fixture (4.6Mlt. + VAT) • test: • lab use for 1.5 days (shaker) (2.8Mlt. + VAT) • data acquisition and reporting (1.474Mlt. + VAT) • leakage current measurement: • 2 hrs/tray (400klt. + VAT), 380 trays Acceptance (Italy) thermal 32 IDT - 12/06/01

  33. Space tests: towers dynamic (sine sweep/random vibration) Qualification (USA) towers A/B thermal • dynamic (random vibration): • fixture (4.6Mlt. + VAT) • test: lab use for 1day/tower (shaker) (1.6Mlt. + VAT) Acceptance (Italy) flight towers • thermal • 288 hrs/tower • cosmic rays • 1-2 weeks/tower 33 IDT - 12/06/01

  34. Power supply for the tracker • The italian collaboration has a well defined interest for contributing to the • design and construction of the power supply of the tracker (as described in • the MoA) • technical activity on this item has already been budgeted (~ 0.6 M$) • italian groups can exploit a significant experience in power supply • qualification for space experiments: prototypes have been developed in • collaboration with industrial partners for AMS • we are ready to join the working group for defining the power supply • specification and architecture • we want to work in tight collaboration with the electronics group at SLAC • and the other collaborating institutions with agreed sharing of • responsibilities 34 IDT - 12/06/01

  35. Detector software - main areas of collaborations: Software activity I - Tracking II - Detector description III - Event display and graphics IV - GLAST simulation V - Test data analysis VI - Construction and test software 35 IDT - 12/06/01

  36. XML C++ generic model • Detector geometry in XML (GDD,detModel) • unique description for recon, simulation, graphics • now read by: • visualization tools • G4 simulation • prototype ROOT event display • Recon to be implemented 36 IDT - 12/06/01

  37. GLAST Software: on-going activities • Simulation • LAT implemented in G4 • interfaced to detModel (XML geometry description) • interfaced to a prototype ROOT event display • Next steps: • G4 validation (general, BT, BF) • interface with GAUDI • insert digitization modules 37 IDT - 12/06/01

  38. Software: on-going activities • Interactive event display • for simulation, • reconstruction, analysis • collecting user • requirements from • whole collaboration • candidates: ROOT (C++) • and Wired2 (Java) • ROOT event display for • Balloon flight under • development 38 IDT - 12/06/01

  39. Software: on-going activities Software for construction and test • I - construction database • requirements set by institutions collaborating in construction • MSAccess prototype under test • other software under evaluations II - development of a reduced version of reconstruction package for lab-tests of stack of trays or a tower with cosmic rays 39 IDT - 12/06/01

  40. Software: on-going activities • Test data analysis • analysis of simulated data from BFEM and BTEM configurations for G4 validation studies • preparation for BFEM data analysis • Tracking • study of charge sharing and signal generation to improve simulation • study of TOT to improve vertexing • angular accuracy study • energy measurement from angular dispersion 40 IDT - 12/06/01

  41. Tracking: ToT studies from beam test data 1 Mip (g converted in preceding planes) 2 Mips (g converting on this plane) 1 Mip pulse height information can be exploited to improve fast vertex finding 41 IDT - 12/06/01

  42. Activity of GLAST-Italy started full steam on both hardware and software • The Italian Collaboration is providing critical contributions to: • LAT design and preparation for construction • development of detector software • Signature of MoA between STANFORD/SLAC and ASI/INFN seems close • Formal approval from INFN of the spending profile this week. This will allow to start soon tenders for SSD procurement for tracker construction • Qualification of industrial partners for ladders and tray construction is well under way • Ladder assembly can start in fall, this year Conclusions 42 IDT - 12/06/01

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