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The GEMPix detector

Tsung-Yung Lu
January 07, 2022

The GEMPix detector

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Tsung-Yung Lu

January 07, 2022
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  1. 1. FITPix 2. Temperature / Pressure / Humidity sensor 3.

    Timepix ASICs x4 4. Kapton foil 5. GEM covered with copper GEMPix detector
  2. • 50 µm kapton foil • copper cladded • chemically

    perforated • diameter 70 µm (50 µm) • pitch of 140 µm • voltage difference • 400 ~ 500 V • 100 kV/cm inside the holes • maximum gain by single GEM • 103 GEM(Gas Electron Multiplier)
  3. • The last GEM induces a signal on the chip

    • Collect mode • Medipix mode • Time-over-Threshold • Time-of-Arrival • FITPix (FPGA module) • Pixelman software Timepix ASICs
  4. • CERF facility at CERN • Proton and Pion •

    Momenta of 120 gev / c • Drift volume 3 x 3 x 1.2 cm3 Particle Detection Studies and Microdosimetry
  5. • The first version of Timepix ASIC cannot simultaneously measure

    deposited charge ToT and ToA • Mixed Mode:1 in every 16 pixels measure ToA while the rest measure ToT Mixed Mode
  6. • 15 out of 16 pixels measure ToT • 1

    out of 16 measure ToA Track Incident at 30。 Measured in Mixed Mode Operation
  7. • Removing the need for a mixed mode • Time

    resolution:1.5ns • Maximum data throughput rate:85m hits / s Timepix3 ASIC
  8. • CNAO, the italian centre for oncological hadrontherapy in pavia

    • Synchrotron • Proton beam • Carbon ion beam Measurements
  9. • Pencil beam • Carbon ions KE • 280MeV/u •

    332 MeV/u • Bragg peak at 147 mm • 3D reconstruction of the energy deposition (Fig. up) • the comparison with the commercial Peakfinder (Fig. down) GEMPix mounted on water phantom
  10. • high flux of gammas • the comparison of the

    GEMpix and film in 10 min GEMPix detector used to dosimetry measurements in radiotherapy
  11. • The energy released by 6kev x-ray • 45 samples

    • sensitivity:30 Bq/g 55-Fe content in radioactive waste sample
  12. • image of the plasma • pin-hole system • Timepix:ToT

    mode GEMPix in Soft X-ray Emitted by Laser Produced Plasmas
  13. • Measure the x-ray fluxes as a function of the

    energy • plasma pileup of the charge in front of Timepix's pixel • The central spots with no filters (normalization) The GEMPix With Different Thickness of Alluminum Filters Placed in Front of The Detector
  14. • The gempix is a reliable detector • Study in

    the detection efficiency of thermal neutron and ions • Shown good performance measuring the characteristics of high intensity beam in cancer treatment • Monitoring of plasmas using the soft x-ray not visible by room temperature silicon detector Conclusions
  15. • F.Murtas et al., 2020, The GEMPix detector. • Johannes

    Leidner, Fabrizio Murtas and Marco Silari, 2021, Medical Applications of the GEMPix. • G. Claps, D. Pacella, et al., 2016, The GEMpix detector as new soft X-rays diagnostic tool for laser produced plasmas. Reference