1 / 21

Novel 3D micro-structuring of diamond for radiation detector applications : enhanced performances evaluated under part

Novel 3D micro-structuring of diamond for radiation detector applications : enhanced performances evaluated under particles and photons beams . B.Caylar 1 , M.Pomorski 1 , D.Tromson 1 , José Alvarez 2 , P.Bergonzo 1. 1 CEA-LIST, French Atomic Energy Commission, FRANCE

burke
Download Presentation

Novel 3D micro-structuring of diamond for radiation detector applications : enhanced performances evaluated under part

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Novel 3D micro-structuring of diamond for radiation detector applications : enhanced performances evaluated under particles and photons beams. B.Caylar1, M.Pomorski1, D.Tromson1, José Alvarez2, P.Bergonzo1 1CEA-LIST, French AtomicEnergy Commission, FRANCE 2Laboratoire de Génie Electrique de Paris , France IUMRS-ICEM 2012 | 25 SEPT 2012

  2. Context • Diamond detectors in High EnergyPhysics • All LHC experiments already use diamonds for beam monitoring or as pixel detectors • CMS is building Pixel Luminosity Telescope • 48 scCVD pixel modules (5 mm x 5 mm) • ATLAS is building Diamond Beam Monitor • 24 pCVD pixel modules (21 mm x 18 mm) • Upgrade plans include diamond as candidate for innermost pixel tracker layer(s) Pixel Detectors Beam Monitors Marko Mikuž “Diamond Sensors”,ICHEP (2012) IUMRS-ICEM 2012 | 25 SEPT 2012

  3. Context • Luminosityprevisions At LHC, luminosity will increase more and more in the following years IUMRS-ICEM 2012 | 25 SEPT 2012

  4. Context • Radiation hardnessisstill an issue in diamond • NIEL inducesbulkdefects… • Higher luminosity • Faster signal decrease • Development of advanced detectors • Diamond detectors • Silicon 3D detectors • Why won’t we try to build the radiation hardest • detector ever ? A 3D Diamond Detector… Before irradiation After 1.2 x 1014 n.cm-2 After 1.97 x 1014 n.cm-2 Signal decrease IUMRS-ICEM 2012 | 25 SEPT 2012

  5. Context • Whatis a 3D detector ? • Planar geometry • QMIP = 18000 e-h pairs • TOF = 5 ns • 3D geometry • QMIP = 18000 e-h pairs • TOF = 200 ps 50µm 500µm • Analyticallycalculatedcurrentsgenerated by a MIP IUMRS-ICEM 2012 | 25 SEPT 2012

  6. Context • Whatis a 3D detector ? • Planar geometry • QMIP = 18000 e-h pairs • TOF = 5 ns • 3D geometry • QMIP = 18000 e-h pairs • TOF = 200 ps 50µm 500µm CCE drops by 53% CCE drops by 5% • Analyticallycalculatedcharge collection IUMRS-ICEM 2012 | 25 SEPT 2012

  7. Burriedelectrodes • Laser setup and fabrication • Electrodes are processedusing laser-inducedgraphitization • Wavelength : 800nm • Repetition rate : 1kHz • Pulse length : 100fs • Spot size : 10µm IUMRS-ICEM 2012 | 25 SEPT 2012

  8. 100µm Burriedelectrodes • Laser setup and fabrication Processimprovement over the pasttwoyears Dec 2010 100µm Feb 2011 • Femtosecondlaser • Diameter: 5µm • Pitch < 35µm • YAG Laser • Hollow, conicalshape • Diameter: 100µm • Pitch : 300µm • UV Laser + x10 Lens • Diameter: 75µm • Pitch : 200µm • UV Laser + x20 Lens • Diameter: 20µm • Pitch : 150µm 100µm 100µm Jun 2011 Apr 2012 IUMRS-ICEM 2012 | 25 SEPT 2012

  9. Burriedelectrodes • Whyisfemtosecond laser somuchbetter ? • A two-step process • Producing a graphitic seed at the surface • Excitation of a large number of valence electrons via multi-photon absorption • Energybarrierdecreases • Phase transition Diamond- Graphite • Propagation of laser supported graphitic wave No heataccumulation T.V. Kononenko et Al – Rus’nanotech (2010) IUMRS-ICEM 2012 | 25 SEPT 2012

  10. Burriedelectrodes • Structural characterization • Electrode Raman Analysis • Diamond • Border EHT = 5kV WD = 4.9mm Mag = 11.85k X IUMRS-ICEM 2012 | 25 SEPT 2012

  11. Burriedelectrodes • Structural characterization Electrode mappingusingConductive probe AFM J.Alvarez, LGEP 200 kΩ 1µm 1µm ρ ~ 1 Ω.cm • AFM mapping • Resistancemapping • Resistance distribution in the mapping area IUMRS-ICEM 2012 | 25 SEPT 2012

  12. 3D Diamond detector • Optical microscopy Final detector - 45° tilted • scCVDsample Courtesy of CERN • Graphitization process is not yetoptimized – 70% success rate IUMRS-ICEM 2012 | 25 SEPT 2012

  13. 3D Diamond detector • Characterizationusing90Sr 90Sr experimentallowsyou to get MIP in yourlab IUMRS-ICEM 2012 | 25 SEPT 2012

  14. 3D Diamond detector • Characterizationusing90Sr Charge collection efficiencymeasurement • HV = -200V 3D Detector seems to have a 65% CCE at maximum • Most probblyartificiallycut by electronicshaping time (200ns) • Under investigation IUMRS-ICEM 2012 | 25 SEPT 2012

  15. 3D Diamond detector • Characterizationusing synchrotron micro-beam Side raster scan - 15keV photons - 3µm spot 9,500 300µm 300µm • HV = -200V Synchrotron µ-beam • Charge iscollectedwithin the wholethickness IUMRS-ICEM 2012 | 25 SEPT 2012

  16. 3D Diamond detector • First application Timing measurementduring GAMMHADRON beamtime – 25MeV protons • Hodoscope vs 3D detector • Hodoscope vs plastic • Time resolutionisbetterusing 3D diamond detector IUMRS-ICEM 2012 | 25 SEPT 2012

  17. 3D Diamond detector • Summary Wemanaged to… • Produceelectrodeswithsuitable dimensions for detectors applications • Check thatelectrodes are graphitic and conductive • Check thatsuchelectrodes are active and allow charge collection • Use thatnextgeneration detector in a timing application Nowweneed to… • Optimize the graphitization process and get 100% efficiency in graphitization • Irradiate the samples and measuretheir radiation hardness IUMRS-ICEM 2012 | 25 SEPT 2012

  18. Thanks for your attention ! IUMRS-ICEM 2012 | 25 SEPT 2012

  19. 3D Diamond detector • Acknowledgements People @ CEA-LIST • Nicolas Tranchant • Hassen Hamrita • Nicolas Vaissière • Céline Gesset • Externalco-workers • Alexander Oh • Cinzia Da Via • Lin Li • David Whitehead • NatkoSkukan • Thorsten Wengler IUMRS-ICEM 2012 | 25 SEPT 2012

  20. Burriedelectrodes • Whyisfemtosecond laser somuchbetter ? • A two-step process • Producing a graphitic seed at the surface • Excitation of a large number of valence electrons via multi-photon absorption • Energybarrierdecreases • Phase transition Diamond- Graphite • Propagation of laser supported graphitic wave No heataccumulation Energybarrierdecrease Multi-Photon Absorption C.Z. Wang et Al -Phys. Rev. Lett. 85, 4092 (2000) T.V. Kononenko et Al – Rus’nanotech (2010) IUMRS-ICEM 2012 | 25 SEPT 2012

  21. IUMRS-ICEM 2012 | 25 SEPT 2012

More Related