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The Silicon Tracker of AMS02

The Silicon Tracker of AMS02. Daniel Haas DPNC Geneva 6th International Conference on Large Scale Applications and Radiation Hardness of Semiconductor Detectors Firenze, 29 Sep - 1 Oct 2003. The AMS02 Experiment and its Goals The Silicon Tracker of AMS02 Design & Overview

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The Silicon Tracker of AMS02

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  1. The Silicon Tracker of AMS02 Daniel Haas DPNC Geneva 6th International Conference on Large Scale Applications and Radiation Hardness of Semiconductor Detectors Firenze, 29 Sep - 1 Oct 2003 • The AMS02 Experiment and its Goals • The Silicon Tracker of AMS02 • Design & Overview • Production and Assembly (Silicon, Frontend, Readout) • Testbeam Results & Performance • Outlook & Conclusions

  2. The AMS02 Experiment Acceptance ~ 0.45 m2sr Weight ~ 6 tons Power ~ 2 kW D. Haas Firenze, 29 Sep - 1 Oct 2003, page 2

  3. AMS02 - Physics Goals • Search for Antimatter  Improve Limits of AMS01 • Increased Sensitivity • Energy Range of O(1-10 TV/c) • Anti-Helium  Cosmic Antimatter • Anti-Carbon  Anti-Stars • Search for Dark Matter • High statistics for e, Antiprotons and g Spectra • Cosmic Ray Studies • Precision measurements of light isotopes • Sources of High Energy Photons • AMS02 is foreseen on ISS in November 2005 D. Haas Firenze, 29 Sep - 1 Oct 2003, page 3

  4. Silicon Tracker – Overview... • 2264 Sensors • Doublesided Silicon ~ 6.4m2 total • 1024 channels each • Combined into Ladders of 7-15 sensors, around 200k channels • 8 layers on support planes • 2 external planes - 1 layer each • 3 internal planes - 2 layers each • Goals: • Track charged particles • Measure rigidities p/Z up to O(10 TV)with s(p)/p ~ 1.5 % • Identify elements via dE/dx D. Haas Firenze, 29 Sep - 1 Oct 2003, page 4

  5. Silicon Tracker – Collaboration • University of Geneva, Switzerland • INFN - University of Perugia, Italy • RWTH-I Aachen, Germany • National Central University, Taiwan • CERN, Switzerland • University of Turku, Finland • NIKHEF, Netherlands • NLR, Netherlands D. Haas Firenze, 29 Sep - 1 Oct 2003, page 5

  6. ...Silicon Tracker – Ladders Two-sided silicon is used K-side (n) has 384 channels S-side (p) has 640 channels Ladder is reinforced with Airex Channels are bonded to Frontend D. Haas Firenze, 29 Sep - 1 Oct 2003, page 6

  7. ...Silicon Tracker – Ladders D. Haas Firenze, 29 Sep - 1 Oct 2003, page 7

  8. Upilex foil is used on K-side to connect to Frontend Daisy chained on S-side ...Silicon Tracker – Frontend • Frontend produced by IDEas, Norway • AC coupling with PreAmp via Capacitors • 64 channel PreAmp/Shaper • Multiplexed analog readout ~11.000 bonds for 12-sensor ladder D. Haas Firenze, 29 Sep - 1 Oct 2003, page 8

  9. ...Silicon Tracker – Assembly D. Haas Firenze, 29 Sep - 1 Oct 2003, page 9

  10. ...Silicon Tracker – Electronics Tracker Data Reduction Board (TDR) • Collect analog data and digitize it • Perform online data compression • Remove Pedestals • Calculate and Remove Common Noise • Search Clusters Tracker Bias Supply (TBS) Power Supply for FrontEnd (TPSFE) D. Haas Firenze, 29 Sep - 1 Oct 2003, page 10

  11. Testbeam Evaluation • Testbeam at CERN SPS, Oct 2002 • 20 GeV/c Protons and Fragmented Ions • 1 week of DAQ, ~107 events on disk • Study of Resolution, dE/dx etc... • Testbeam at CERN PS, Jun 2003 • 10 GeV/c Protons • Study of Shaping Time, Resolution etc... Under Preparation: • Testbeam at CERN SPS, Oct 2003 • New quasi final electronics • Testbeam at GSI Darmstadt, Nov 2003 • Dedicated Ion runs (12C etc...) D. Haas Firenze, 29 Sep - 1 Oct 2003, page 11

  12. Testbeam Evaluation – Setup... D. Haas Firenze, 29 Sep - 1 Oct 2003, page 12

  13. Testbeam Evaluation – ...Setup 6 Silicon Ladders (connected to Tracker Electronics) ←NIM-Crate ←DC/DC-Converter ←Tracker Electronics ←DAQ PC (connected to Control Room Run Control) Beamline D. Haas Firenze, 29 Sep - 1 Oct 2003, page 13

  14. Testbeam Results – Shaping Time • K-Side • Best shaping time around 4-5 ms • S-Side • Best shaping time around 2.5-3.5 ms Electronics can handle different shaping times Preliminary Bill Burger D. Haas Firenze, 29 Sep - 1 Oct 2003, page 14

  15. Testbeam Results – Signal to Noise Preliminary Bill Burger Signal to Noise of ~8 on S-Side and ~6.5 on K-side for Protons D. Haas Firenze, 29 Sep - 1 Oct 2003, page 15

  16. Testbeam Results – Resolution Preliminary Bill Burger Resolution around 20-30 m in x (K-side) and 8-10 m in y (S-side) (this corresponds to the expected resolution of 110 mm/12 and 27.5 mm/12) D. Haas Firenze, 29 Sep - 1 Oct 2003, page 16

  17. Testbeam Results – Raw Data • Raw Data: • 4He is cut away • Different dynamic behaviour of S and K Side • Correct charge integral: • for center-of-gravity • for each Z • for each PreAmp • Calculate truncated charge for S and K Preliminary Bill Burger D. Haas Firenze, 29 Sep - 1 Oct 2003, page 17

  18. K-Side Testbeam Results – Center-of-Gravity Apply Correction Preliminary Philipp Azzarello D. Haas Firenze, 29 Sep - 1 Oct 2003, page 18

  19. Testbeam Results – corrected... Preliminary Philipp Azzarello D. Haas Firenze, 29 Sep - 1 Oct 2003, page 19

  20. Testbeam Results – ...corrected Preliminary Preliminary Philipp Azzarello D. Haas Firenze, 29 Sep - 1 Oct 2003, page 20

  21. Conclusions • AMS02 silicon tracker is on schedule • Ladder Production nearly finished • Assembly of planes has started and is going well • Production of readout electronics is ongoing • Silicon ladders show excellent performance • Good Signal to Noise • Resolution of ~20-30 mm for x and ~8-10 mm for y confirm expected performance • dE/dx results outperform expectations • Elements up to Nickel could be identified • BUT: careful study of corrections is necessary • More studies on upcoming testbeams... D. Haas Firenze, 29 Sep - 1 Oct 2003, page 21

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