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GLAST: Gamma Ray Large Area Telescope

GLAST: Gamma Ray Large Area Telescope. GLAST-Italia: Partecipation to the LAT and construction commitments R.Bellazzini Italian Project Manager. GLAST Concept Low profile for wide f.o.v. Segmented anti-shield to minimize self-veto at high E.

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GLAST: Gamma Ray Large Area Telescope

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  1. GLAST:Gamma Ray Large Area Telescope GLAST-Italia: Partecipation to the LAT and construction commitments R.Bellazzini Italian Project Manager 1 Milano - 16/03/01

  2. GLAST Concept Low profile for wide f.o.v. Segmented anti-shield to minimize self-veto at high E. Finely segment calorimeter for enhanced background rejection and shower leakage correction. High-efficiency, precise track detectors located close to the conversions foils to minimize multiple-scattering errors. Modular, redundant design. No consumables. Low power consumption (580 W) Charged particle anticoincidence shield  Conversion foils Particle tracking detectors • Calorimeter • (energy measurement) e+ e- Pair-Conversion Telescope Photons materialize into matter-antimatter pairs: E -> me+c2 + me-c2 2 Milano - 16/03/01

  3. Tracker Grid Thermal Blanket ACD DAQ Electronics Calorimeter The Large Area Telescope (LAT) • Array of 16 identical “Tower” Modules, each with a tracker(Si strips) and a calorimeter (CsI with PIN diode readout) and DAQ module. • Surrounded by finely segmented ACD (plastic scintillator with PMT readout). • Aluminum strong-back “Grid,” with heat pipes for transport of heat to the instrument sides. 3 Milano - 16/03/01

  4. The LAT Hardware 4 Milano - 16/03/01

  5. One Tracker Tower Module Carbon thermal panel Electronics flex cables GLAST Tracker Design Overview • 16 “tower” modules, each with 37cm  37cm of active cross section • 83m2 of Si in all, like ATLAS • 11500 SSD, ~ 1M channels • 18 x,y planes per tower • 19 “tray” structures • 12 with 3% Pb or W on bottom (“Front”) • 4 with 18% Pb or W on bottom (“Back”) • 2 with no converter foils • Every other tray is rotated by 90°, so each Pb foil is followed immediately by an x,y plane of detectors • 2mm gap between x and y oriented detectors • Trays stack and align at their corners • The bottom tray has a flange to mount on the grid. • Electronics on sides of trays: • Minimize gap between towers • 9 readout modules on each of 4 sides 5 Milano - 16/03/01

  6. Tray assembling Carbon-carboncloseout • Trays are C-composite panels (Al hexcel core) • Carbon-fiber walls provide stiffness and the thermal pathway • from electronics to the grid. 6 Milano - 16/03/01

  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 Milano - 16/03/01

  8. Calendar Years 2010 2003 2000 2005 2002 2004 2001 Launch Inst. Delivery SRR I-CDR M-CDR I-PDR NAR M-PDR Implementation Ops. Formulation Inst. I&T Inst.-S/C I&T Build & Test Flight Units Build & Test Engineering Models Schedule Reserve SSD Procurement Ladder Production Tray Assembly Project schedule 8 Milano - 16/03/01

  9. Bari Perugia Pisa Roma 2 Trieste Udine Collaborations Dipartimento di Ingegneria Aerospaziale (Univ. Pisa) Dipartimento di Ingegneria dei Materiali (Univ. Perugia) INFN Collaboration Sezioni INFN 30 FTE physicists 9 Milano - 16/03/01

  10. Status of INFN approval process Construction money ceiling (INFN+ASI) of 20 GL ˜ 9.5 M$ INFN is willing to approve 10 Milano - 16/03/01

  11. GLAST: MoA …... and ASI and ASI …... 11 Milano - 16/03/01

  12. Construction commitment and ASI 12 Milano - 16/03/01

  13. Construction commitment and ASI 13 Milano - 16/03/01

  14. Construction commitment 14 Milano - 16/03/01

  15. Construction commitment 15 Milano - 16/03/01

  16. Construction commitment 16 Milano - 16/03/01

  17. Mechanics: on-going activities • 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) • 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 • Towers: • Construction of a tower Engineering Model (19 trays) for qualification of • procedures and industrial partners 17 Milano - 16/03/01

  18. Sensors: on-going activities • Qualification of sensor Suppliers: • Complete set of measurements on pre-serie prototypes from • various suppliers ( HPK-Japan, Micron-UK, ST-Italy ): • inter-strip capacitance, bulk capacitance, depletion voltage, dark • current, decoupling capacitance and resistance, ... • Definition of automatic test procedures for mass production 18 Milano - 16/03/01

  19. Tests on preserie of final HPK SSD Comparison between HPK and GLAST results Measurements at Hiroshima U. (20), INFN-Pisa (10), SLAC (5) 19 Milano - 16/03/01

  20. 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 20 Milano - 16/03/01

  21. Software: on-going activities Simulation - development in G4 of the GLAST-LAT - XML description of LAT geometry - digitization (charge sharing, FE simulation, TOT) - MC validation Track reconstruction - study of TOT to improve vertexing - angular accuracy study - energy measurement from angular dispersion - development of a reduced version of reconstruction package lab-tests of stack of trays or a tower with cosmic rays Interactive event display(evaluating WIRED2) 21 Milano - 16/03/01

  22. XML C++ generic model We have done the C++ hierarchy of classes for accessing the XML geometry description of GLAST 22 Milano - 16/03/01

  23. Gamma Ray Telescope G4 example Official advanced example in release 3.0 of G4... 23 Milano - 16/03/01

  24. Conclusions • Activity of GLAST-Italy started full steam on both hardware and software • The Italian Collaboration is providing critical contributions to the LAT design and to the preparation for construction • Strong need of fast signature of MoA between STANFORD • /SLAC and ASI/INFN • Strong need of formal approval from INFN and ASI of the spending profile to start soon tenders for SSD procurement on tracker construction 24 Milano - 16/03/01

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