CALICE SiW Electromagnetic Calorimeter Testbeam performance and results Roman Pöschl LAL Orsay IEEE – NSS&MCI '08 Dresden/Germany - October 2008 - The.

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Presentation transcript:

CALICE SiW Electromagnetic Calorimeter Testbeam performance and results Roman Pöschl LAL Orsay IEEE – NSS&MCI '08 Dresden/Germany - October The CALICE Collaboration - SiW Ecal Prototype - Testbeam Results Optimising the Energy Measurement - Summary and Conclusion

IEEE 08 Dresden Oct The Collaboration Calorimeter R&D for the ~293 physicists/engineers from 51 Institutes and 13 Countries from 4 Continents - Integrated R&D effort - Benefit/Accelerate Detector Development due to common approach

IEEE 08 Dresden Oct E. Garutti 3 Intermediate task: Build prototype calorimeters to Establish the technology Collect hadronic showers data with unprecedented granularity to - tune clustering algorithms - validate existing MC models Final goal: A highly granular calorimeter optimised for the Particle Flow measurement of multi-jets final state at the International Linear Collider Si-W ECAL Scint. Tiles-Fe AHCAL Scint. Strips-Fe TCMT Imaging calorimeter The Calice Mission E. Garutti ECFA Valencia

4 IEEE 08 Dresden Oct Ecal Prototype - CALICE Collaboration - W as absorber material - Signal extraction by “Silicon Wafers” - Extreme high granularity 1x1 cm 2 cell size - Detector is optimized for particle separation, RHUL

5 IEEE 08 Dresden Oct Ecal in CERN... and indeed it can separate particles !!! Particle distance ~5cm – No confusion!!!! Shower by 6 GeV e - Particle Distance ~5cm

IEEE 08 Dresden Oct Large scale testbeam effort by CALICE Collaboration Data taking 2006, 2007, 2008 TCMT CALICE Testbeam Data Taking Testbeam Setup at CERN 2007 ECAL Analogue HCAL TCMT Slabs slit into alveolas Data taking /3 equipped Ecal Data taking 2007 (nearly) fully equipped Ecal Data taking 2008 fully equipped Ecal Today: Analysis of 2006 Data

IEEE 08 Dresden Oct Calibration – Uniformity of Response Calibration with with wide spread µ-beam 18 Mio. Events Uniform response of all cells only 1.4‰ dead cells Differences in Response can attributed to different - Manufacturers - Production series Experience to deal with different manufacturers and production series Essential for final detector ~3000m 2 of Silicon needed

8 IEEE 08 Dresden Oct Stability Comparison between calibration constants achieved in situ and on a dedicated testbench Calibration once achieved can be transported Important for taking testbeam data at different locations

9 IEEE 08 Dresden Oct Ecal Correction of Energy Deposition - Acceptance Need to take geometrical acceptance into account in analysis E/GeV Absolute calibration by comparing E dep on MIP level with beam energy Dips in energy measurement by inter wafer gaps (needed for isolation)‏ 2

10 IEEE 08 Dresden Oct Correction of Energy Deposition I – Acceptance Correction Restoring homogeneous response with correction function Energy loss due to acceptance limits not fully recovered Important issue for future R&D Requires close collaboration between CALICE and SiWafer Suppliers

11 IEEE 08 Dresden Oct Correction of Energy Deposition II – Sampling Fraction Sampling Fraction increases with calorimeter depth Accounting for varying amount of supplementary material Naive Weighting: preliminary

12 IEEE 08 Dresden Oct Linearity of Response Overview Residuals - Highly linear response over large energy range - Linearity well reproduced by MC MIP/GeV ~ [1/GeV] - Offset O(1MIP)‏ - Linearity O(1%)‏ - Residuals from low energetic signals in cells Might be reflection of guard ring effect (See talk by R. Cornat)‏ Not yet implemented in digitisation step

13 IEEE 08 Dresden Oct Energy Resolution Example 20 GeV e- beam: Gaussian like Calorimeter Response Resolution curve shows typical √E dependency - Resolution well describes by MC - Actual number not overwhelming for electromagnetic calorimeters but Design emphasises spatial granularity over energy resolution Calorimeter for Particle Flow

14 IEEE 08 Dresden Oct SiW Tungsten Ecal with up to 9400 cells operated successfully during testbeam campaigns 2006 (and 2007 and 2008)‏ Today: Selected Results from 2006 campaign - Stable operation uniform response to MIPs, robust calibration only 1.4‰ dead cells - Shows direction for future R&D Discussed Today: Wafer Guard Ring effects - Require Acceptance Correction - Compromise slightly Linearity - Energy resolution and Linearity well described by MC Linearity O(1%)‏ Resolution (17%/√E ⊕ 1)% Summary and Outlook

15 IEEE 08 Dresden Oct Backup...

62 mm Si Wafer : 6×6 pads of detection (10×10 mm 2 )‏ Important point : manufacturing must be as simple as possible to be near of what could be the real production for full scale detector in order to : Keep lower price (a minimum of step during processing) ‏ Low rate of rejected processed wafer good reliability and large robustness Wafers passivation Compatible with a thermal cooking at 40° for 12H, while gluing the pads for electrical contact with the glue we use (conductive glue with silver). Silicon sensors : Matrices  4” High resistive wafer : 5 K  cm  Thickness : 525 microns  3 %  Tile side : mm  1 set of guard rings per matrix  In Silicon ~80 e-h pairs / micron  e - /MiP  Capacitance : ~21 pF (one pixel)‏  Leakage 200 V : < 300 nA (Full matrix)‏  Full depletion bias : ~150 V  Nominal operating bias : 200 V  Break down voltage : > 300 V

Front-end PCB 6 active wafers Made of 36 silicon PIN diodes 216 channels per board Each diode a 1 cm²square 12 FLC_PHY3 front-end chip 18 channels per chip 13 bit dynamic range 2 calibration switches chips 6 calibration channels per chip 18 diodes per calibration channel Line buffers To DAQ part Differential 30 layers with varying thickness Courtesy of J.C. Vanel LLR