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Recent results obtained with GEMPix Detector

Recent results obtained with GEMPix Detector. J.Alozy 1 , M.Campbell 1 , G.Claps 2 , S. George 1 , J.Lindner 1 F . Murtas 1,2 , M. Silari 1 , D.Tagnani 2 1 ) CERN , 2) INFN Frascati Laboratory. D etector layout and construction Characterization and performances Applications.

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Recent results obtained with GEMPix Detector

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  1. Recent results obtained withGEMPix Detector J.Alozy1, M.Campbell1 , G.Claps2, S. George1, J.Lindner1 F. Murtas1,2, M. Silari1, D.Tagnani2 1) CERN, 2) INFN Frascati Laboratory • Detector layout and construction • Characterization and performances • Applications F.Murtas MPGD 2017 Philadelphia

  2. Two Micro Pattern Detectors Gas Electron Multiplier Medipix 70 µm 140 µm GEM foil GEMPix 4 Timepix chips Triple GEM Triple GEM Readout Electronics F.Murtas MPGD 2017 Philadelphia

  3. GEMPix Detector This innovative gas detector has been designed in the ARDENT framework within a collaboration between CERN and INFN. It is a triple GEM detector read be a 4 naked Timepix(no silicon sensor): Particles to be analysed Mylar window 3mm ionization gap Active area is 9 cm2 4Timepix chips Triple GEM Gas flux Ar CO2CF4 or Tissue equivalent gas In three years we found several applications for this type of detector: Radioactive waste, Micro dosimetry, Hadrontherapy, Radiotherapy, Radon Monitor … but also Dark Matter Research ! F.Murtas MPGD 2017 Philadelphia

  4. Single particle detection X-ray detection 6 keV from 55Fe (1 sec frame) 6 keV 20% res single electron Cluster Charge The Timepixsoftware PIXELMAN can recognize the cluster and measure in real-time its energy F.Murtas MPGD 2017 Philadelphia

  5. Time and charge measurements 3D single track reconstruction Charge and dE/dX Improvements foreseen with TIMEPIX3 chips F.Murtas MPGD 2017 Philadelphia

  6. 3D particle track reconstruction 3x3 cm2 3x3 cm2 Z coordinate (1 cm) Minimum Ionizing Particle Highly ionizing particle Z coordinate (1 cm) F.Murtas MPGD 2017 Philadelphia

  7. Gain vs HV settings Changing the triple GEM voltage the gain of the detector is defined from ionization chamber up to 104 F.Murtas MPGD 2017 Philadelphia

  8. DAQ Scheme HV Control Online display FITPIX DAQ interface pixelman HVGEM GEMPix Online Plots Online Cluster Analysis The HV system change the chamber voltage to have a constant gain A python script perform a cluster analysis to have a real-time selection of 6 keV X-rays

  9. Energy Calibration and TP correction The temperature and the pressure measured inside the detector allowthe realtime HV correction to obtain gain stability before USB 30% Online HV correction Temperature and Pressure sensor after 10% F.Murtas MPGD 2017 Philadelphia

  10. Measurements on treatment Carbon beam at CNAO (Pavia) 332 MeV/A Carbon Ion Beam 33 different depths throughout water phantomEach position given spot 8x106carbon ion treatment F.Murtas MPGD 2017 Philadelphia

  11. Measurements at CNAO The GEMPix has been inserted inside the water phantom Beam F.Murtas MPGD 2017 Philadelphia

  12. Comparison DDS and GEMPIX DDS (ionization chamber) GEMPix 9-10 spills per position sec sec Good agreement on beam time evolution between GEMPix and DDS F.Murtas MPGD 2017 Philadelphia

  13. Comparison with GEANT4 33 measurements in depth to reconstruct the carbon ion Bragg Peak GEANT4 GEMPix Flux 8x106 Energy 332 MeV/u Good agreement with GEANT4 simulation F.Murtas MPGD 2017 Philadelphia

  14. 2D Single spot Plateau Bragg Peak Tail Beam spot taken on Plateau, Bragg Peak and Tail Frame length : 20 ms and 100 ms (before and after the Bragg peak). F.Murtas MPGD 2017 Philadelphia

  15. 3D Carbon Ion Beam at CNAO Flux 8x106 Energy 332 MeV/u Fragments F.Murtas MPGD 2017 Philadelphia F.Murtas 19/2/2016 ICTR-PHE 2016 Geneva

  16. New Water Phantom@CERN Now we are preparing in ideas2 @CERN a GEMPix water phantom with its own ionization chamber completely independent and fully automatized for a 3D deep scan. Next test at CERN calibration hall and at CNAO F.Murtas MPGD 2017 Philadelphia

  17. GEMPix for Radiotherapy GEMPix detector (8cm2 GEM detector read by 55x55mm pixels, 262 000 channels ) - 2D measurements of energy released in IMRT (Policlinico Tor Vergata Roma) 6 MeV gamma 6 MeV gamma GEMpix, 1 min Gaffilm 10 min IntensityModulatedRadiationTherapy (IMRT) F. Murtas , G. Claps, D. Falco CERN, INFN, PTV An optimal agreement between GEMPix and gafchromic film is obtained Real-time measurements with GEMPix allows fast Quality Assurance procedure Possible use in microbeam proton therapy for beam diagnostics F.Murtas MPGD 2017 Philadelphia

  18. Microdosimetry And a tissueequivalent gas mixture can be used !! F.Murtas MPGD 2017 Philadelphia

  19. GEMPix for Fe-55 active waste 20 % energy resolution at 6 keV Fe-55 samples measured with GEMPix Linearity test Frame readout: online cluster analysis

  20. Soft-X ray imaging on KSTAR tokamak (South Korea) frame 5 frame 6 Pin-hole camera with GEMpix HV gain 980 V Acquisition mode: counting 20 frames Time with 10 ms frame 7 frame 8 A frame every 700 msabout A dead time of about 700 ms is observed between two consecutive frames. Observed contrast from the plasma center

  21. GEMpix at ECLIPSE (France) laser pulses: • laser wavelength = 800 nm • Cu - 170mJ at 100 kHz, τ = 39 fs • Ni, Fe, 175 mJ @ 100 kHz, τ = 39 fs • Focal spot 10 um (at target) Experimetela set-up with CCD and GEMpix Cu Ti Ni Fe 100 mm diameter 1 mm thick 5 cm

  22. Copper target: threshold scan @ 900 V gain Al 10 um no filter Al 40 um no filter Al 20 um Cu 30 um The threshold scan has been realized at a gain of 900 V. Results show that detector response varies significantly for the different used targets. GEMpix is sensitive to the different charge released by the different energy sources in the gas drift region.

  23. Image resolution of GEMpix: objects and UttnerMask plastic1 plastic2 Tungsten Copper The Uttner mask show that the detector working with ArCO2 (70/30) gas mixture can distinguish with a spatial resolution until 500 um.

  24. CERN Knowledge Transfer Now GEMPix is in the portfolio of the CERN Knowledge Transfer and we are working for a complete construction technology transfer (within 2017) Some prototype are underway trying to improve the readout performance (Timepix3) and to increase the active area 3x3 (4.5x4.5 cm2) or 4x4 (6x6 cm2) F.Murtas MPGD 2017 Philadelphia

  25. GEMPix applications GEMPix Detector (8 cm2 GEM detector read by 55x55mm pixels, 262 000 channels ) - Radioactive waste 55Fe measurements at CERN (LEP, PS, SPS, LHC) - 3D measurements of energy released in water phantom in Hadrontherapytreatment facility (CNAO Pavia) - Gamma ray monitor for Radiotherapy dose measurement (Policlinico Tor Vergata, Rome) - X-ray monitor in Inertial Fusion test facility (Petal, France ) - X-ray monitor in KSTAR Tokamak reactor (Korea) - Proton tomography prototypes (Nikhef, The Netherlands) - Dark matter prototype for directional dark matter searches with carbon nanotubes - Dark matter prototype for NITEC: a Negative Ion Time Expansion Chamber for directional Dark Matter search Radiotherapy: GEMPIX vs radiochromic film Hadrontherapy 3D reconstruction F.Murtas MPGD 2017 Philadelphia

  26. Thanks for your attention Hadrontherapy Radiotherapy: GEMPIX vs radiochromic film 3D reconstruction F.Murtas MPGD 2017 Philadelphia

  27. Backup slides F.Murtas MPGD 2017 Philadelphia

  28. Single event Upset (SEU) F.Murtas MPGD 2017 Philadelphia

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