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Some recents results at NIKHEF

Some recents results at NIKHEF. M. Chefdeville, E. Bilevych, H. van de Graaf, J. Timmermans D. Attié, P. Colas Medipix meeting, CERN – 13 September 2007. Overview. Pixel readout of gaseous detectors using Micromegas -like structures

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Some recents results at NIKHEF

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  1. Some recents resultsat NIKHEF M. Chefdeville, E. Bilevych, H. van de Graaf, J. Timmermans D. Attié, P. Colas Medipix meeting, CERN – 13 September 2007 Medipix meeting, CERN – 13.09.2007

  2. Overview • Pixel readout of gaseous detectors using Micromegas-like structures • Adding functionalities to pixel readout chips by wafer post-processing • Gas gain grids: Ingrid • Discharge protection: Siprot • Results with some Timepix chambers, 65k channel μTPC • 55Fe source • Cosmic rays data • 90Sr source in TOT and Time modes Medipix meeting, CERN – 13.09.2007

  3. Processing Ingrids • Substrate can be: • Si wafer with a patterned anode • Pixel readout chip • Photo-resist coating & exposure • Define the amplification gap (tens of μm) • Define the supports (pillars/walls) • Metal film deposition & patterning • Define the grid geometry • Dissolve the un-exposed resist • + some cleaning photo-resist (MESA+, Univ. Twente) substrate 50 μm pitch 20 μm pitch Medipix meeting, CERN – 13.09.2007

  4. New Ingrid developments and results • Process improvement: grids much flatter • Extremely good energy resolution: 13.6 % FWHM with 55Fe in P10 • Removal of Kβ 6.5 keV line: 11.7 % @ 5.9 keV in P10 • With F=0.17 and Ne = 229  gain fluctuation ~ 0.5 • New wafer masks: hole pitches down to 20 μm with various diameters and gaps • Investigate Micromegas geometry • Test of the ion backflow theory feasible • Until now: 1 μm thin Al but can now be increased to 5 μm by electrolysis Expect less damaged from sparks Kα escape Kβ escape 13.6 % FWHM Gap: 50 μm; Hole picth: 32 μm,Ø: 14 μm Kβ-filtered spectrum with Cr foil 11.7% FWHM Max Chefdeville (NIKHEF/Saclay) + Twente Univ. Medipix meeting, CERN – 13.09.2007

  5. Status of Timepix usage at NIKHEF • 1st Timepix(+ 3 μm Siprot):“under HV” Dec-Jan 2006 for 40 days He/isoButane 80/20 thendied after ONE day with Ar/isoButane • “Old” detector: (Timepix C08-W0014 + 3 μm Siprot): was “under HV” with He/isoButane 80/20since 24 April (for 3 months!) • Detector Next-1: (Timepix E09-W0014+ 20 μm Siprot + Ingrid):under HV for > one month with He/isoButane • Detector Next-2: (Timepix + 20 μm Siprot + Ingrid): just started on Ar/isoButane • Detector Next-3: (Medipix2.1 + 30 μm Siprot + Ingrid):gain 200k reached Medipix meeting, CERN – 13.09.2007

  6. NIKHEF setup (on 24 Aug. 2007) Next-3 Next-1,2 “old” Medipix meeting, CERN – 13.09.2007

  7. Irradiation: 55Fe source • Timepix chip + Micromegas mesh: Moiré effects CERN • Timepix chip + SiProt + Ingrid: MESA+ “Uniform” IMT Neuchatel Medipix mode Medipix meeting, CERN – 13.09.2007

  8. Cosmic rays time Timepix + 20 μm thick Siprot + Ingrid A “long” cosmic track He/Iso (80:20) Medipix meeting, CERN – 13.09.2007

  9. Irradiation: 90Sr source Timepix + 20 μm Siprot + Ingrid in Next-1 TOT mode He/Iso (80:20) 5 ms/frame Medipix meeting, CERN – 13.09.2007

  10. Irradiation: 90Sr source Timepix + 20 μm Siprot + Ingrid in Next-1 Time mode He/Iso (80:20) 118 μs/frame Medipix meeting, CERN – 13.09.2007

  11. Further Developments RELAXD project (Dutch/Belgian)NIKHEF, Panalytical, IMEC, Canberra: • Chip tiling:large(r) detector surfaces (2x2, 2x4 chips) • Through Si connectivity:avoiding bonding wires • Fast readout technology:~5 Gb/s Hope for “through Si vias” (with Medipix chips) later this year! Medipix meeting, CERN – 13.09.2007

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