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Allpix Squared: Pixel Detector Simulation Framework Guide

Learn how to simulate detectors, from energy deposition to digitization, using Allpix Squared tool. Understand charge propagation in modern C++ framework with Geant4 simulation. Explore models, telescope setups, and more. Validate simulations and access user-friendly resources like the website and repository.

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Allpix Squared: Pixel Detector Simulation Framework Guide

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  1. Allpix2Generic Pixel Detector Simulation Framework Koen Wolters (koen.wolters@cern.ch) Daniel Hynds Simon Spannagel 30-08-2017 - CLICdp Collaboration Meeting

  2. Introduction • Why simulation? • Understand behavior • Modify simulation to describe data • Extrapolate and predict behavior • How to simulate detectors? • Energy deposition in the sensor • Electron-hole propagation to the implant • Digitisation in the readout electronics 30.08.17 Allpix Squared 2

  3. Simulation tools • Specific Geant4 simulation & propagation tool • Requires full description of detector • Large development effort • AllPix (1) • Allows to quickly setup simulation • Geant4 application • Allpix2 Geant4 Digitizer (1) AllPix Digitizer (2) 30.08.17 Allpix Squared 3

  4. Allpix Squared • Framework in modern C++ • Modular structure • Slim core • Independent modules • Intuitive configuration 30.08.17 Allpix Squared 4

  5. Detector models Timepix Mimosa26 Bump bonds 30.08.17 Allpix Squared 5

  6. Telescope setup 30.08.17 Allpix Squared 6

  7. Telescope setup DUT 30.08.17 Allpix Squared 7

  8. Charge deposition 30.08.17 Allpix Squared 8

  9. Charge deposition • Single 20° track • Local coordinates • Marker size scales with number of charge deposits 30.08.17 Allpix Squared 9

  10. Charge propagation • Single 20° track • Local coordinates • Both drift and diffusion simulated 30.08.17 Allpix Squared 10

  11. Charge propagation • Single 45° track • Local coordinates • Both holes (orange) and electrons (blue) are collected 30.08.17 Allpix Squared 11

  12. Charge propagation • Interaction within sensor • Multiple tracks • Only electron propagation enabled • Large cluster of pixels hit 30.08.17 Allpix Squared 12

  13. Charge propagation • Shower of particles • Many separate tracks and clusters 30.08.17 Allpix Squared 13

  14. Charge propagation V/cm V/cm not depleted 30.08.17 Allpix Squared 14

  15. Charge propagation • Electron propagation in example TCAD field • HR-CMOS pixel • Total time 25ns 30.08.17 Allpix Squared 15

  16. Digitisation 30.08.17 Allpix Squared 16

  17. Digitisation hits per pixel 30.08.17 Allpix Squared 17

  18. Flexibility Electric field Charge deposition Charge propagation Charge transfer Monitoring Writing output Digitisation Geometry construction Ad Advantage of modular structure 30.08.17 Allpix Squared 18

  19. Validation Setup Allpix2 (short version) 30.08.17 Allpix Squared 19

  20. Validation Normalized to fractions for comparison 30.08.17 Allpix Squared 20

  21. Validation Normalized to fractions for comparison 30.08.17 Allpix Squared 21

  22. Summary & Outlook • Simulation framework is fully functional • Performance looks good, data well reproduced • Physics validation and analysis continues • New features planned • induced charge propagation, • extended detector description • and more... 30.08.17 Allpix Squared 22

  23. Website & Repository • Everyone can start to use the framework https://cern.ch/allpix-squared (Introduction, User’s manual, Code reference) • Fully open-source, any contributions are welcome https://gitlab.cern.ch/simonspa/allpix-squared (version v1.0 will be released next week) 30.08.17 Allpix Squared 23

  24. Thank you! Questions? Generated on https://www.openhub.net/p/allpix-squared 30.08.17 Allpix Squared 24

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