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Status report NIKHEF

Status report NIKHEF. NIKHEF Auke-Pieter Colijn Alessandro Fornaini Harry van der Graaf Peter Kluit Jan Timmermans Jan Visschers Saclay CEA DAPNIA Maximilien Chefdeville Paul Colas Yannis Giomataris Arnaud Giganon Univ. Twente/Mesa+ Jurriaan Schmitz

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Status report NIKHEF

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  1. Status report NIKHEF NIKHEF Auke-Pieter Colijn Alessandro Fornaini Harry van der Graaf Peter Kluit Jan Timmermans Jan Visschers Saclay CEA DAPNIA Maximilien ChefdevillePaul Colas Yannis Giomataris Arnaud Giganon Univ. Twente/Mesa+ Jurriaan Schmitz CERN/Medipix Constm Eric Heijne Xavie Llopart Michael Campbell PhD student per 1/9/04 Thanks to: Wim Gotink Joop Rovenkamp TPC R&D phone/VRVS meeting 21/7/2004

  2. Detection of single electrons using MediPix2/Micromegas assembly as Direct Pixel Segmented Anode • Analysis of cosmic data 31/3-2/4 • Final draft of NIM paper ready http://www.nikhef.nl/~d90/tesla/letter3.pshttp://www.nikhef.nl/~d90/tesla/letter3.pdf • #pixels hit/mm track length = 1.83 • #clusters/mm track length = 0.52 • Single electron efficiency 0.9 • Moire effects: mismatch in pixel and hole pitch: 60/(60-55) = 12 pixels repetition

  3. He/Isobutane 80/20 Modified MediPix Sensitive area: 14 x 14 x 15 mm3 Drift direction: Vertical max = 15 mm

  4. He/Isobutane 80/20 Modified MediPix δ-ray?

  5. Peter Kluit: cluster & electron density versus MC of MIP cosmic rays: single electron efficiency > 0.90 AND: Good explanation for Moire effect: pitch Micromegas holes: 60 μm pitch MediPix pixels: 55 μm Periodic position of hole w.r.t. pixel: repeats after 12 pixels! Non Modified Modified

  6. Modified Non Modified InGrid: perfect alignment of pixels and grid holes! Small pad: small capacitance!

  7. InGrid Integrate GEM/Micromegas and pixel sensor ‘GEM’ ‘Micromegas’ By ‘wafer post processing’

  8. First InGrid expected in 2-3 weeks Wafer dia.: 100 mm 30 fields with variety of pillar geometry

  9. INGRID: some first trials Various pitches, shapes

  10. WSLC-Paris 2004: LC ready in 2015…, not known where….. • People with power and $: what is the relevance for LHC?! • So: • Other applications of TimePixGrid: • μ-TPC • upgrades of TPCs: STAR, ALICE • Transition Radiation Detectors • GOSSIP: tracker for intense radiation environment

  11. MIP Micromegas CMOS pixel array GOSSIP: Gas On Slimmed SIlicon Pixels MIP Cathode foil CMOS pixel chip Drift gap: 1 mm Max drift time: 10 ns

  12. Essentials of GOSSIP: • Generate charge signal in gas instead of Si (e-/ions versus e-/holes) • Amplify # electrons in gas (electron avalanche versus FET preamps) • Then: • No radiation damage in depletion layer or pixel preamp FETs • No power dissipation of preamp FETs • GOSSIP: 1 mm gas layer + 20 μm gain gap + CMOS (digital!) chip • After all: it is a TPC with 1 mm drift length (parallax!) Max. drift length: 1 mm Max. drift time: 10 ns Resolution: 0.1 mm  1 ns

  13. Efficiency Position resolution Rate effects Ageing Radiation hardness HV breakdowns Power dissipation Material budget More details in http://www.nikhef.nl/~d90/tesla/NIPHAD_GOSSIP.ppt

  14. Conference presentations: • LCWS Paris, April (Jan T.) • IPRD Siena, May (Harry v/d G.) • IWORID Glasgow, July (Alessandro F.) • VERTEX Como, September (Harry v/d G.) • IEEE Rome, October ( Harry v/d G. ?)

  15. Coming activities: • Cosmic trigger setup ready in few weeks • New Micromegas available very soon (PaulC.?) • New Medipix2 available • First Ingrid1 tests • Simulations • Longer term: • Ingrid2 together with MediPix • Development of Timepix1 (for TPC) and Timepix2 (for GOSSIP) CMOS chips

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