The Timepix3 telescope Martin van Beuzekom, Panagiotis Tsopelas 1 on behalf of the LHCb Velo Upgrade group Telescopes & Testbeams Workshop DESY 2014 1 email: ptsopel@nikhef.nl
Introduction The Timepix3 detector The telescope Epilogue Motivation Upgrade of the LHCb detector Triggerless readout & Software trigger Data driven readout Integrated luminosity of 50 fb − 1 Radiation hard devices Upgrade of the Vertex Locator strips → pixels Velopix silicon pixel detector 200 µm sensor on 200 µm ASIC Timepix3: prototype for Velopix Testbeams for sensor & ASIC characterization efficiency tests high fluence irradiation( ∼ 10 16 n eq / cm 2 ) high rate tests (80 Mhits/s) Telescopes & Testbeams Workshop The Timepix3 telescope 1
Introduction The Timepix3 detector The telescope Epilogue Hybrid pixel operation What is it Hybrid pixel detector: sensor-readout separately processed 256 x 256 square pixels of 55 µm size measures Position (x, y) Time of Arrival Time over Threshold Principles of operation Sensor is a reversed biased p-n junction charged particle ionizes the sensor e − /holes drift to the readout readout processes the collected charge Telescopes & Testbeams Workshop The Timepix3 telescope 2
Introduction The Timepix3 detector The telescope Epilogue Sensors for LHCb Velo Upgrade Sensor characteristics 200 µm thick (exploring other thicknesses too) 400-450 µm wide guard rings n-on-p (n-on-n) Radiation hard up to ∼ 10 16 n eq / cm 2 Non-homogeneous irradiation (factor 40 difference between tip and other end) 8.5 tracks per bunch crossing hit rate: average (peak) 600 (900) Mhits/s Vendors Micron Hamamatsu Telescopes & Testbeams Workshop The Timepix3 telescope 3
Introduction The Timepix3 detector The telescope Epilogue Timepix3 chip Timepix3 predecessor of Velopix Velopix early next year use Timepix3 for sensor characterisation programme Timepix3 specs 130 nm CMOS technology Maximum hit rate 40 Mhits/s/cm 2 Simultaneously 18-bit ToA and 10-bit ToT Q(t) Time resolution of 1.55 ns thr ToA range 400 µ s ToT in 10-bits with configurable resolution Discr. out time Dead time per pixel is charge depended clock (typical 800 ns) TOT Time of Arrival Zero suppressed data driven readout Telescopes & Testbeams Workshop The Timepix3 telescope 4
Introduction The Timepix3 detector The telescope Epilogue SPIDR Readout timepix3 Power chipboard 10 GbE FPGA Single chips up to quads 10 Gbps Ethernet link 1 Timepix3 chip at full speed: 6 Gbps/s Prototype SPIDR with Xilinx VC707 board Dedicated PCB (compact SPIDR) available later this year Telescopes & Testbeams Workshop The Timepix3 telescope 5
Introduction The Timepix3 detector The telescope Epilogue First results with silicon on a Timepix3 chip Timewalk and ToT linearity Cosmic rays through sensor Threshold 500e - TOT slope ~75ns/ke - 80 1.6 70 1.4 60 1.2 50 1 TOT ns TOA µs TOA 40 0.8 TOA<25ns@800e - TOT TOT (Linear fit) 30 0.6 Timewalk 20 0.4 10ns@1500e - TOA jitter 10 0.2 <0.5ns@5.5ke - 0 0 0 2.5 5 7.5 10 12.5 15 17.5 20 Q in ke - measurements done using testpulses 300 µm thick silicon p-on-n sensor figures taken from Massimiliano De Gaspari’s talk in TIPP 2014 chip is working very well plan to use it in the beam telescope Telescopes & Testbeams Workshop The Timepix3 telescope 6
Introduction The Timepix3 detector The telescope Epilogue Telescope Set up 2 arms with 4 telescope planes each Device under Test (DUT) set in the middle active area of ∼ 2 cm 2 Timepix3 telescope mechanics similar to existing Timepix telescope work in progress Telescopes & Testbeams Workshop The Timepix3 telescope 7
Introduction The Timepix3 detector The telescope Epilogue Performance Resolution [micron] 12 Resolution 10 Each plane tilted at “optimum angle” to achieve 8 the best resolution 6 4 ⇒ pointing resolution < 2 µm for a 180 GeV beam After Eta Correction 2 (sub-pixel probing on pixel DUT’s) Resolution in x (tilting direction) 0 -20 -10 0 10 20 Track Angle [degrees] 55 μ m 55 μ m Improvements from Timepix to Timepix3 telescope Smaller Radiation length Timepix telescope: x / X 0 ≃ 2.6%, Timepix3 telescope: x / X 0 ≃ 0.4% Higher Rates Timepix telescope: 10 ktracks/sec, Timepix3 telescope: 10 Mtracks/sec Telescopes & Testbeams Workshop The Timepix3 telescope 8
Introduction The Timepix3 detector The telescope Epilogue Results with the Timepix Telescope Efficiency at the last pixels of Active-edge sensors Efficiency in steps of 2 m in X (zoomed) Efficiency in steps of 2 m in X (zoomed) efficiency efficiency 1 1 0.8 0.8 physical edge - µ = 2 µ m physical edge - µ = 5 µ m 0.6 0.6 Erf Erf 0.4 0.4 0.2 0.2 0 0 -7.1 -7.08 -7.06 -7.04 -7.02 -7 -6.98 -6.96 6.95 7 7.05 7.1 7.15 X [mm] X [mm] track track Results with heavily irradiated Medipix3’s limited radiation studies Medipix3 only available radiation hard device 0.5 × 10 15 n eq / cm 2 2.5 × 10 15 n eq / cm 2 In many analyses performed, more data would be beneficial Telescopes & Testbeams Workshop The Timepix3 telescope 9
Introduction The Timepix3 detector The telescope Epilogue Hardware Additional telescope elements 2 scintillators for time-stamps for other LHCb users Cooling for the DUT peltier elements maybe CO 2 cooling Mechanics similar to existing telescope mechanics (rotation & translation stages etc.) DAQ raw data stored locally on DAQ PC’s 600 MByte/sec per DAQ PC separate DAQ stream (copy) for online monitoring (DQM) (“look” at a sample of data) Telescopes & Testbeams Workshop The Timepix3 telescope 10
Introduction The Timepix3 detector The telescope Epilogue Data Flow Network / Data flow TPX3% TPX3% TPX3% SPIDR% SPIDR% SPIDR% monitoring for high rate data 10 GbE DAQ + Slow DAQ%PC% DAQ%PC% DAQ%PC% R 1 GbE raw data Moni 1%(linux)% 2%(linux)% N%(linux)% o 1 GbE O offline reads data from DAQ PC Slow + Offline a (a 1%GbE%switch% slow control Se 1 GbE 1 GbE 1 GbE s Slow + Run Moni Oflline e o Onine% Run%%ctrl%% Slow%%control% Offline%PC(s)% Monitoring%% %(linux)% (windows)% (linux)% (linux)% Telescopes & Testbeams Workshop The Timepix3 telescope 11
Introduction The Timepix3 detector The telescope Epilogue Software environment Test beam data flowchart (condensed) Readout philosophy: when a pixel is hit .. Run Control a data-packet with address, time and charge information is sent DAQ PCs will continuously record the stream of DAQ Slow Control pixel packets Copied samples reconstruction software relies on timestamps Pre-processor DQM Project “Kepler” TB-data.root DQM-plots.root based on LHCb software framework used in LHCb collaboration Distinguish between events (e.g hit, cluster, track) and tools (e.g. fit) VeloTB analysis algorithms in C++, python configurables, xml package description of detectors Telescopes & Testbeams Workshop The Timepix3 telescope 12
Introduction The Timepix3 detector The telescope Epilogue Online Software Data Quality Monitor (DQM) GUI standalone .cpp using ROOT and Qt libraries online check of data quality on sample of data “basic” plots of hitmaps, correlations etc. courtesy of Daniel Martin Saunders (Bristol) Telescopes & Testbeams Workshop The Timepix3 telescope 13
Introduction The Timepix3 detector The telescope Epilogue Offline Software Software chain 1 Time re-ordering of data 2 Clustering 3 Track Finding (Pattern Recognition) Look in a volume (cylinder) for best fitted track Least squares fit performed 4 Additional Track Fitting Kalman-Filter for low energy beams 5 timestamped tracks will be provided for“external" users Alignment aligning on residuals implement also Millipede Software already running “fake” raw data MC data based on Gaussian, Landaus etc. Telescopes & Testbeams Workshop The Timepix3 telescope 14
Introduction The Timepix3 detector The telescope Epilogue Summary LHCb upgrade Velo group actively working of pixel for the LHCb upgrade (2018/2019) In view of this: making a new telescope Telescope to characterize new ASICS & sensors Telescope will also be used by other LHCb group (non VELO) The Timepix3 telescope New telescope under construction based on Timepix3 ASIC Online & offline software developed in paralled with hardware Active area 2 cm 2 2 µm resolution at >100 GeVbeam Smaller radiation length by a factor 6 Higher data rate by a factor 1,000 (10 Mtracks/s) Telescopes & Testbeams Workshop The Timepix3 telescope 15
Introduction The Timepix3 detector The telescope Epilogue Plans Testbeam periods in 2014 July in PS First tests of Hardware & Software October in SPS First 3 × 1 assemblies December in SPS (Fermilab?) Irradiated DUT’s Exiting times ahead! Telescopes & Testbeams Workshop The Timepix3 telescope 16
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