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Status ‘Si readout’ TPC at NIKHEF

Status ‘Si readout’ TPC at 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 ‘Si readout’ TPC at NIKHEF

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  1. Status ‘Si readout’ TPC at 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 Erik Heijne Xavie Llopart Michael Campbell PhD student per 1/9/04 Thanks to: Wim Gotink Joop Rovenkamp ECFA Workshop Durham 4/9/2004

  2. Goals • Gas multiplication GEM or Micromegas foil(s) • Charge collection with granularity matching primary ionisation cluster spread • Needs sufficiently low diffusion gas • dE/dx using cluster counting? ( M. Hauschild) • Proof of principle based on existing Medipix2 readout chip

  3. With Paul Colas & Ioannis Giomataris: MediPix2 & Micromegas 55Fe Cathode (drift) plane Drift space: 15 mm Micromegas Baseplate MediPix2 pixel sensor Brass spacer block Printed circuit board Aluminum base plate Very strong E-field above (CMOS) MediPix!

  4. He/Isobutane 80/20 Modified MediPix 31 March 2004 Sensitive area: 14 x 14 x 15 mm3 Drift direction: Vertical max = 15 mm

  5. He/Isobutane 80/20 Modified MediPix 31 March 2004

  6. He/Isobutane 80/20 Modified MediPix 31 March 2004

  7. He/Isobutane 80/20 Modified MediPix 31 March 2004 δ-ray?

  8. Example of a track reconstructed • This track: • #hits = 24 • #clusters = 11 • length (3d) = 16.8 mm • 1.4 e-/mm; 0.65 cl./mm • On average: • 1.8 e-/mm; 0.5 cl./mm

  9. Detection of single electrons using MediPix2/Micromegas assembly as Direct Pixel Segmented Anode • Analysis of cosmic data 31/3-2/4 finalised • NIM paper submitted 31/8/04 • #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

  10. 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

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

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

  13. Wafer dia.: 100 mm 30 fields with variety of pillar geometry First trials with pillars look OK Some problems with ‘Micromegas’ grid (hope to have first sample in few weeks

  14. INGRID: some first trials Various pitches, shapes

  15. Other applications of TimePixGrid: • μ-TPC (e.g. KABES in NA48/3 ?) • upgrades of TPCs: STAR, ALICE • Transition Radiation Detectors • GOSSIP: tracker for intense radiation environment

  16. 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

  17. 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

  18. 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

  19. Ongoing/Coming activities: • Cosmic trigger setup ready • New Micromegas available very soon (Paul C.) • New Medipix2 available • First Ingrid1 tests • Simulations • Longer term: • Ingrid2 together with MediPix • Development of Timepix1 (for TPC) and Timepix2 (for GOSSIP) CMOS chips New collaborators are welcomed!

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