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Timepix for the AIDA Telescope

Timepix for the AIDA Telescope. Recent( ish ) results from the Timepix Telescope project Richard Plackett , University of Glasgow. Outline. The Timepix Chip Timepix Telescope Spatial Resolution Readout Systems and Track Readout Rate Timing and LHC 40MHz compatibility Some Example Results

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Timepix for the AIDA Telescope

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  1. Timepix for the AIDA Telescope Recent(ish) results from the Timepix Telescope project Richard Plackett, University of Glasgow

  2. Outline • The Timepix Chip • Timepix Telescope Spatial Resolution • Readout Systems and Track Readout Rate • Timing and LHC 40MHz compatibility • Some Example Results • Integration with AIDA

  3. The Medipix Chips Silicon, 3D, CdTe, GaAs, Amorphous Silicon, Gas Amplification, Microchannel Plates etc… A philosophy of functionality built into the pixel matrix allows complex behavior with a minimal inactive region Configurable ‘shutter’ allows many different applications 55um square pixel matrix 256 by 256

  4. The Timepix Chip Timepix design requested and funded by EUDET collaboration Time over Threshold Time of Arrival Conventional Medipix2 counting mode remains. sensor Threshold Addition of a clock up to 100MHz allows two new modes. Time over Threshold Time of Arrival Threshold Analogue amplification Digital processing Pixels can be individually programmed into one of these three modes Time of Arrival counts to the end of the Shutter Time Over Threshold counts to the falling edge of the pulse Chip read-out

  5. Angled Planes to Boost Resolution Hits that only affect one pixel have limited resolution (30um region in 55um pixel) Tilting the sensor means all tracks charge share and use the ToT information in centroid, CoG calculations 55um 55um 9o 0o 300um 300um Perp ~10um resolution 9o ~4.2um resolution Indicative Timepix events

  6. Timepix Telescope – Resolution per Plane Timepix: 55 mm pitch Operating point of Telescope planes Resolution measured at Testbeam Resolution per plane 4um Resolution at Device Under Test (with 8 planes) 1.6um

  7. Timepix Telescope Arm Prototype early 2010 USB2 readout – 700 tracks per second 6 pixel telescope planes angled in 2 dimensions to optimise resolution Fine pitch strip detector with fast electronics readout Device Under Test moved and rotated via remote controlled stepper motor

  8. Timepix Telescope Arm Prototype late 2010 • High Resolution Large Area X-Ray Detector • RELAXD readout from NIKHEF • 55 frames per second over gigabit Ethernet • 5,000k tracks per second readout 50,000,000 tracks recorded in 2 weeks Eight different DUTs analysed RELAXD interface RELAXD interface RELAXD interface beam Cooled DUT Timepix ToT Tracking Timepix ToT Tracking

  9. Added Time Tagging Capability to ~1ns • Asynchronous SPS beam not suited to LHC systems designed for 25ns bunch structure • Implemented a TDC which with Timepix ToA mode gives us ~1ns per track time stamping • Able to provide and record synchronised triggers to 40MHz readout systems (TELL1) • Allows software reconstruction and analysis of asynchronous tracks Telescope in Time Tagging configuration for LHCb Sensor Readout Timepix ToA Track Time Tagging Plane ~100ns beam Beetle DUT Timepix ToT Tracking Timepix ToT Tracking Scintillator Coincidence and TDC ~1ns Synchronised Trigger Logic + TDC

  10. Timepix Telescope TLU • Currently we use 2 NIM crates and a VME TDC to perform timing tasks • Controlling the Shutter – eg selecting X particles per frame • Providing triggers to external systems • Measuring the phase between synchronised and unsynchronised triggers • We hope to replace all this with a much more portable TLU based on an Altera development board. Work is ongoing at Santiago. • Need to plan for integration to AIDA TLU

  11. Moving to Full Telescope Arms • Major hardware work remaining is to make the system easier to set up and use • Very strong overlap with proposed AIDA work Si bias Arm VHDCI 3V Si bais 3V Busy Readout RELAXD + PSUs Shutter Ethernet 240V VHDCI

  12. Some Results from the Timepix Telescope...

  13. Example Frame from 2010 Testbeam

  14. 150um Sensor Results With a 150um sensor the optimum resolution point is at twice the angle of a 300um The higher data rate allows a significant number of measurements to be taken

  15. Sub Pixel Resolution Position of 1, 2, 3 and 4 pixel clusters plotted as a function of track position within the pixel 1 pixel 3 pixel 2 pixel 4 pixel

  16. 2009 Results – 3D Sensors Efficiency Double sided 3D sensor Perpendicular particles passing through a doped hole will deposit less charge in the silicon The sub-pixel resolution of the telescope allows us to see the efficiency losses due to the anode and cathode wells in the silicon.

  17. Timepix Arm Performance Summary • 1.7mm spatial resolution • 1ns timing resolution • Up to 5kHz track rate • >1Mhz instantaneous beam rate

  18. Next Steps for AIDA • TLU Development and Testing • Critical for shutter driven operation and timing resolution • Critical for LHC 25ns bunch structure analysis • Mechanics Integration • Integration to other AIDA systems • Preserve angled planes for high resolution • Readout Integration • Critical for track rate • RELAXD currently 55 fps, increasing to 100 • Institutes that expressed interest in the Timepix package in the proposal: • CERN, Glasgow, Santiago, Liverpool, Bristol

  19. Plans for AIDA Timepix Arms • The overall plan is to develop systems similar to the Timepix Telescope for the AIDA Timepix arms. • Sensors and readout systems should be available in the next 4 to 6 months • From this meeting would like to understand the interfaces to other AIDA Telescope systems • Readout, TLU, Control Software, Mechanics etc etc • To retain the performance its critical to have input to TLU and mechanics design from the initial stages of development as well as specific testing programs • Make use of overlap with other work packages eg Glasgow working on alignment in WP2

  20. To Conclude • The Timepix Telescope has demonstrated: • Excellent spatial resolution: better than 1.7um track extrapolation error • Good timing resolution: ~1ns • A high data rate: ~5k tracks a second (hope to improve with software) • All this can/will apply to AIDA Timepix Arms • Still need to work on integration with other AIDA systems • Readout • TLU • Services • Effort for this available form CERN, Glasgow and Santiago • Components should begin to be available in four to six months

  21. Backup Slides

  22. Timepix Telescope Project Members • Closely linked to LHCb VELO upgrade project • A slightly unofficial collaboration to develop a telescope to demonstrate tracking with the Timepix chips • Major contributions from • CERN : Timepix, Mechanics and Software • Glasgow : Timepix and Timing logic • Santiago Compostella : Mechanics and Timing logic • Nikhef : Readout and Timing logic • Oxford : Software

  23. 2010 Timepix Telescope - RELAXD Readout • High Resolution Large Area X-Ray Detector • RELAXD readout from NIKHEF • 55 frames per second over gigabit ethernet

  24. Efficiency Efficiency and noise appear as we expect

  25. 2009 Results - TimpixToT Calibration Energy mapping of Timepix calibration is now confirmed with MIPs

  26. Results 2009 - Ikrum Variations As Ikrum varied, change in ToT range observed and some loss in resolution PRELIMINARY - analysis by D. Hynds Amplifier Response Time

  27. 2010 Testbeam Activity • Significant increase in activity • 3 beam periods as main user • Added Time Tagging System for 40MHz • USB2 and RELAXD readouts for faster data rate • More Timepix Planes in the Telescope • Many Devices tested • LHCb VELO Prototype strip • 3D irradiated Timepix, • FZ beetle strip, • BCB beetle strip • MCX beetle strip • 150um Timepix • 300um Timepix

  28. 2009 Testbeam - Proving Timepix for LHCb Main Measurements: 300um silicon and DS3D assemblies Resolution vs Angle Resolution vs Threshold Resolution vs Silicon Bias Efficiency vs Threshold Efficiency vs Bias Timewalk In early 2009 Timepix competing with BtevFpix design to be VELO upgrade baseline Timepix had not been used at all in a particle tracking application We took the opportunity to run parasitically in EUDET and CMS beam periods Running parasitically required us to provide a telescope

  29. Early Telescopes in 2009 June 2009 : Medipix Testbeam 3 days to demonstrate tracking July 2009 : CMS SiBit beam period Two weeks – parasitic Timepix Telescope 2 Timepix 4 Medipix ~perpendicular 300um and 3D DUTs Manual angle adjustment 2 Timepix 2 Medipix ~perpendicular No DUT

  30. August 2009 Timepix Telescope 4 Timepix, 2 Medipix planes in telescope Symmetric positioning of planes around DUT Telescope planes mounted at nine degrees about x and y to boost resolution (next slide) DUT position and angle controlled remotely by stepper motors 2.3um Track Extrapolation Error ~100Hz track rate 1 frame per second ~100,000 tracks per measurement point ~1.5 hours per point in SPS NA

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