The GEMPix detector - Speaker Deck

Slide 1

Slide 1 text

The GEMPix detector Radiation Measurements Volume 138, November 2020, 106421 F.Murtas slides：TYL

Slide 2

Slide 2 text

OVERVIEW

Slide 3

Slide 3 text

Introduction

Slide 4

Slide 4 text

Introduction • GEMPix detector • GEM • Timepix ASICs

Slide 5

Slide 5 text

GEMPix detector

Slide 6

Slide 6 text

1. FITPix 2. Temperature / Pressure / Humidity sensor 3. Timepix ASICs x4 4. Kapton foil 5. GEM covered with copper GEMPix detector

Slide 7

Slide 7 text

GEMPix detector

Slide 8

Slide 8 text

• GEM(Gas Electron Multiplier) • Timepix ASICs + FITPix GEMPix detector

Slide 9

Slide 9 text

• 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)

Slide 10

Slide 10 text

• 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

Slide 11

Slide 11 text

Timepix ASICs

Slide 12

Slide 12 text

Particle Detection Studies and Microdosimetry

Slide 13

Slide 13 text

• 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

Slide 14

Slide 14 text

• 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

Slide 15

Slide 15 text

• 15 out of 16 pixels measure ToT • 1 out of 16 measure ToA Track Incident at 30。 Measured in Mixed Mode Operation

Slide 16

Slide 16 text

• Removing the need for a mixed mode • Time resolution：1.5ns • Maximum data throughput rate：85m hits / s Timepix3 ASIC

Slide 17

Slide 17 text

• Through-silicon-via (TSV) technology • Without dead spaces Timepix4

Slide 18

Slide 18 text

Timepix 3→4

Slide 19

Slide 19 text

Dosimeter in Hadron Therapy And Radio Therapy

Slide 20

Slide 20 text

• CNAO, the italian centre for oncological hadrontherapy in pavia • Synchrotron • Proton beam • Carbon ion beam Measurements

Slide 21

Slide 21 text

GEMPix mounted on water phantom The GEMPix inside water PMMA box mounted on the water phantom

Slide 22

Slide 22 text

• 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

Slide 23

Slide 23 text

• high flux of gammas • the comparison of the GEMpix and film in 10 min GEMPix detector used to dosimetry measurements in radiotherapy

Slide 24

Slide 24 text

55-Fe Dosimetry in Radioactive Waste

Slide 25

Slide 25 text

• The energy released by 6kev x-ray • 45 samples • sensitivity：30 Bq/g 55-Fe content in radioactive waste sample

Slide 26

Slide 26 text

GEMPix as X-ray Monitoring Burning Plasma Physics

Slide 27

Slide 27 text

• image of the plasma • pin-hole system • Timepix：ToT mode GEMPix in Soft X-ray Emitted by Laser Produced Plasmas

Slide 28

Slide 28 text

• 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

Slide 29

Slide 29 text

Conclusions

Slide 30

Slide 30 text

• 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

Slide 31

Slide 31 text

Thanks

Slide 32

Slide 32 text

• 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