1 / 28

An introduction to radiation hard M onolithic A ctive P ixel S ensors Or :

An introduction to radiation hard M onolithic A ctive P ixel S ensors Or : A tool to measure Secondary Vertices Dennis Doering*, Goethe University Frankfurt am Main on behalf of the CBM-MVD- Collaboration. An introduction to radiation hard M onolithic A ctive P ixel S ensors Or :

meryl
Download Presentation

An introduction to radiation hard M onolithic A ctive P ixel S ensors Or :

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. An introductiontoradiationhard MonolithicActivePixel Sensors Or: A tooltomeasureSecondary Vertices Dennis Doering*, Goethe University Frankfurt am Main on behalf ofthe CBM-MVD-Collaboration

  2. An introductiontoradiationhard MonolithicActivePixel Sensors Or: A tooltomeasureSecondary Vertices • Outline • The challengetomeasureSecondary Vertices • Operation principleof MAPS • Radiation damageeffects • High Resistivityandradiationhardness • Conclusion

  3. Primary Beam: 25 AGeV Au Ions (up to 109/s) Reconstruction concept for open charm Task: ReconstructSecondary Vertices Dennis Doering: An introduction to MAPS Hades Summer School Prague Oct. 2011

  4. Target (Gold) Primary Beam: 25 AGeV Au Ions (up to 109/s) Primary vertex Reconstruction concept for open charm Task: ReconstructSecondary Vertices Dennis Doering: An introduction to MAPS Hades Summer School Prague Oct. 2011

  5. Target (Gold) Primary Beam: 25 AGeV Au Ions (up to 109/s) Primary vertex Reconstruction concept for open charm Task: ReconstructSecondary Vertices Dennis Doering: An introduction to MAPS Hades Summer School Prague Oct. 2011

  6. Target (Gold) Primary Beam: 25 AGeV Au Ions (up to 109/s) Primary vertex Secondary vertex Short lived particle D0 (ct = ~ 120 µm) Reconstruction concept for open charm Task: ReconstructSecondary Vertices Dennis Doering: An introduction to MAPS Hades Summer School Prague Oct. 2011

  7. z Target (Gold) Detector2 Detector 1 Primary Beam: 25 AGeV Au Ions (up to 109/s) Primary vertex Secondary vertex Short lived particle D0 (ct = ~ 120 µm) Reconstruction concept for open charm Task: ReconstructSecondary Vertices z= 5cm Dennis Doering: An introduction to MAPS Hades Summer School Prague Oct. 2011

  8. z= 5cm Target (Gold) Detector2 Detector 1 Primary Beam: 25 AGeV Au Ions (upto 109/s) Primary vertex Secondary vertex Short lived particle D0 (ct = ~ 120 µm) Reconstruction concept for open charm Task: ReconstructSecondary Vertices • 1) Short life time: • Goodspatialresolution • low material budget (scattering) • 2) Rare probe-> High statistics • Fast • Radiation hard Dennis Doering: An introduction to MAPS Hades Summer School Prague Oct. 2011

  9. z Target (Gold) Detector2 Detector 1 Primary Beam: 25 AGeV Au Ions (up to 109/s) Primary vertex Secondary vertex Short lived particle D0 (ct = ~ 120 µm) Reconstruction concept for open charm Task: ReconstructSecondary Vertices z= 5cm • 1) Short life time: • Goodspatialresolution • low material budget (scattering) • 2) Rare probe-> High statistics • Fast • Radiation hard • Is itpossibletodevelop such a detector? • MAPS in CBM @ FAIR Dennis Doering: An introduction to MAPS Hades Summer School Prague Oct. 2011

  10. z Target (Gold) Detector2 Detector 1 Primary Beam: 25 AGeV Au Ions (up to 109/s) Primary vertex Secondary vertex Short lived particle D0 (ct = ~ 120 µm) Reconstruction concept for open charm Use digital camerasasparticledetector z= 5cm • 1) Short life time: • Goodspatialresolution • low material budget (scattering) • 2) Rare probe-> High statistics • Fast • Radiation hard • Is itpossibletodevelop such a detector? • MAPS in CBM @ FAIR Dennis Doering: An introduction to MAPS Hades Summer School Prague Oct. 2011

  11. z Target (Gold) Detector2 Detector 1 Primary Beam: 25 AGeV Au Ions (up to 109/s) Primary vertex Secondary vertex Short lived particle D0 (ct = ~ 120 µm) Reconstruction concept for open charm Use digital camerasasparticledetector: MAPS z= 5cm • 1) Short life time: • Goodspatialresolution • low material budget (scattering) • 2) Rare probe-> High statistics • Fast • Radiation hard • Is itpossibletodevelop such a detector? • MAPS in CBM @ FAIR Dennis Doering: An introduction to MAPS Hades Summer School Prague Oct. 2011

  12. Operation principle N+ SiO2 SiO2 SiO2 P-Well N+ P+ Diode P- Epitaxial Layer Substrate P+ Particle e- e- Dennis Doering: An introduction to MAPS Hades Summer School Prague Oct. 2011

  13. Operation principle 10-40µm => a few µm resolution N+ 50µm SiO2 SiO2 SiO2 P-Well N+ P+ Diode P- Epitaxial Layer Substrate P+ Thinandgoodspatialresolution Dennis Doering: An introduction to MAPS Hades Summer School Prague Oct. 2011

  14. Operation principle 10-40µm => a few µm resolution N+ 50µm SiO2 SiO2 SiO2 P-Well N+ P+ Diode P- Epitaxial Layer Substrate P+ CompareHADES MWPC: Drift cell „pitch“: few 1000µm Resolution: few 100µm Dennis Doering: An introduction to MAPS Hades Summer School Prague Oct. 2011

  15. Radiation hardness? Central Au + Au collision (25 AGeV) Reconstruct up to 1000 tracks per collision and 1010 collisions per year Fast readout and radiation hardness up to ~1013neq/cm² and ~1 MRad Dennis Doering: An introduction to MAPS Hades Summer School Prague Oct. 2011

  16. Classesof radiation damage To be investigated and improved: Radiation hardness against… • … ionizing radiation: • Caused by charged particles and photons • Can ionize atoms and destroy molecules • … non-ionizing radiation: • Caused by heavy, charged and neutral, particles • Atoms are displaced Dennis Doering: An introduction to MAPS Hades Summer School Prague Oct. 2011 Farnan I, HM Cho, WJ Weber, 2007. "Quantification of Actinide α-Radiation Damage in Minerals and Ceramics." Nature 445(7124):190-193.

  17. Non-ionizingradiation (Low Resistivity) SiO2 SiO2 SiO2 N+ P-Well N+ P+ Diode P- Epitaxial Layer Substrate P+ Defectsgeneratedbynon-ionizingradiation. e- Dennis Doering: An introduction to MAPS Hades Summer School Prague Oct. 2011

  18. The history of radiation hard MAPS Smallerpixelpitch => betterradiationhardness Dennis Doering: An introduction to MAPS Hades Summer School Prague Oct. 2011

  19. High Resistivity SiO2 SiO2 SiO2 P-Well N+ P+ N+ Diode depletion P- Epitaxial Layer Substrate P+ e- Dennis Doering: An introduction to MAPS Hades Summer School Prague Oct. 2011

  20. Non-ionizingradiation(High resistivity) SiO2 SiO2 SiO2 N+ P-Well N+ P+ Diode depletion P- Epitaxial Layer Substrate P+ e- Dennis Doering: An introduction to MAPS Hades Summer School Prague Oct. 2011

  21. The history of radiation hard MAPS Dennis Doering: An introduction to MAPS Hades Summer School Prague Oct. 2011

  22. Beam test @ CERN by IPHC Strasbourg Signal Threshold Noise Irradiated High Resistivitysensor: Betterefficiencythanunirradiated Low Resistivitysensor. Dennis Doering: An introduction to MAPS Hades Summer School Prague Oct. 2011

  23. Limit ofradiationhardness? Gain ok 3 · 1014neq/cm² + O(3 MRad) Not irradiated Sensor: - Mi-18 AHR, SB-Pixel, 10 µm pitch - Epitaxial layer: 400 W cm, 15 µm Irradiation: - fast reactor neutrons (Triga, Ljubljana) - Chip not powered during irradiation - Dose: 3 · 1014neq/cm² + O(3 MRad) Noise increases Noise increases => Compensate with cooling. CCE ok <20% less entries Thinner active vol.? Fe-55 (X-rays) Ru-106 (b-rays) 490e (MPV) <20% less signal Thinner act. vol.? 620e (MPV) 99% det. eff. after irrad. Preliminaryconclusion: Sensor tolerates 3 · 1014neq/cm², tobeconfirmed in beam test Dennis Doering: An introduction to MAPS Hades Summer School Prague Oct. 2011

  24. Summary • Forseen in ILC, STAR, CBM and ALICE • MAPS arethetechnologyofchoicefor Open Charm in CBM • Requirementstoday not fullyfulfilled, howeverongoingresearch • Great improvements in the last fewyearsandmanyideasforfuture • Demonstratedexcellentperformance in beam test, even after 1013neq/cm² • Sensor operational in laboratoryeven after 3·1014neq/cm² Dennis Doering: An introduction to MAPS Hades Summer School Prague Oct. 2011

  25. Summary • Forseen in ILC, STAR, CBM and ALICE • MAPS arethetechnologyofchoicefor Open Charm in CBM • Requirementstoday not fullyfulfilled, howeverongoingresearch • Great improvements in the last fewyearsandmanyideasforfuture • Demonstratedexcellentperformance in beam test, even after 1013neq/cm² • Sensor operational in laboratoryeven after 3·1014neq/cm² Conclusion: MonolithicActivePixel Sensors A detectorthat YOU shouldknow Dennis Doering: An introduction to MAPS Hades Summer School Prague Oct. 2011

  26. BACK-UP Dennis Doering: An introduction to MAPS Hades Summer School Prague Oct. 2011

  27. Column parallel sensors Dennis Doering: An introduction to MAPS Hades Summer School Prague Oct. 2011

  28. Column parallel sensors Readoutspeedachieved: <100µs Design goalfor >2015: 30µs Maybepossible in future: <5µs Dennis Doering: An introduction to MAPS Hades Summer School Prague Oct. 2011

More Related