Silicon Detectors. Particle Physics
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1 Mitglied der Helmholtz-Gemeinschaft Silicon Detectors for Particle Physics 9. August 2012 Ralf Schleichert, Institut für Kernphysik
2 Outline Different Cameras Silicon Detectors Taking Pictures in Particle Physics
3 Different Cameras
4 Different Cameras Surface Barrier Single-Pixel Camera
5 Different Cameras Silicon Tracking Telescope Camera
6 Different Cameras ATLAS Camera CMS Camera
7 What do all these cameras have in common? They are expensive for the photographer. The photographer is proud to have them. The intuition which picture to take is not implemented. and seriously They all have silicon sensors to take the pictures. They all have the same underlying principle
8 The Principle
9 A Brief History of Silicon Cameras 1951 First detectors with germanium pn-diodes (McKay) 1959 Gold Surface Barrier Si-Diode J.M. McKenzie and D.A. Bromley, Bull. Am. Phys. Soc. 4 (1959) Working samples of p-i-n detectors (E.M. Pell) 1961 Lithium drifted thick detectors (J.H. Elliot, NIM 12 (1961) 60) 1964 Use of semiconductor detectors in nuclear physics (G.T. Ewan, A.J. Tavendale) 1980 Planar technology (J. Kemmer, NIM 169 (1980) and NIM 226 (1984) 89) CERN NA11 and NA32 measure charm meson lifetimes with planar Si-detectors > 1990 Europe: CERN: ALEPH, DELPHI, L3, OPAL DESY: H1, HERMES, HERA-B, ZEUS. USA: FermiLab: CDF and D0 > 2000 Europe: CERN ATLAS, ALICE, CMS, LHC-b. USA: SLAC Babar Japan: KEK BELLE
10 Silicon Strip Detectors: The Birth Fixed target experiment at CERN with a planar diode. First of planar process developed for chip industry.
11 The birth: NA11 at CERN The aim: Measure lifetime of charm quarks (decay length 30µm)
12 Silicon Strip Detectors: The Fabrication From sand to silicon detectors.
13 The Fabrication: Polycristals sand (SiO 2 ) is heated in a furnace to 1650 C and deoxidated to gaseous SiO. SiO reacts to 99 % pure raw silicon. raw silicon is treated chemically to get 100 % pure polycristalline silicon
14 The Fabrication: Monocrystals
15 The Fabrication: Planar Process
16 Silicon Detectors: Fabrication Use very pure material High resistivity Low bias to deplete device Easy of operation, away from breakdown, charge spreading for better position resolution Low defect concentration No extra current sources No trapping of charge carriers Planar fabrication techniques Make p-i-n diode pattern of implants define type of detector (pixel/strip) extra guard rings used to control surface leakage currents metallisation structure effects E-field mag limits max bias
17 Silicon Strip Detector 6 inch wafer
18 Silicon Detectors: and SLAC
19 Silicon Detectors: (CERN)
20 Silicon Detectors: (FermiLab)
21 Silicon Detectors: CMS (CERN)
22 CMS Tracker: Silicon Sensors
23 CMS Tracker: Logistics
24 CMS Tracker
25 CMS Tracker as a Camera
26 and the picture: ATLAS Camera CMS Camera
27 Silicon Detectors: Development in Size
28 The Principle
29 How to take a picture in particle physics?
30 Interaction 50 MeV proton beam on a deuterium target
31 Interaction of Particles with Matter
32 Silicon Tracking Telescopes Range telescopes with 3 layers of x,y silicon detectors provide 1. E/E particle identification and tracking 2. Energy determination of stopped particles 3. Self-triggering 4. < 1ns time-resolution 5100 µm thick Si(Li) detector 69 µm Si Detektor 300 µm Si detector (is missing in this picture)
33 Charge Collection and Signal Formation
34 Processing of Electrical Signals preamplifiers +HV preamplifiers position-sensitive detector p i n +HV BIAS VSS VDD OutP OutM VDD VSS +LV -LV Capacitive connection of preamplifiers (Bias 250 V - 2 kv) +HV BIAS 0 FGND FVDD FVSS VDD VSS +FV -FV FVDD FVSS FGND AC Buffer with BLR +LV -LV Floating power supply connection of preamplifiers (Bias V) VDD VSS 0 OutP OutM 0
35 VA32TA2 self-triggering front-end electronics: Number of channels 32 Technology 0.8 µm CMOS Power supply ±2 V Power dissipation 3 mw/channel Linear range 11 MeV (±500fC) Slow shaper (Peaking Time) 2 µs Fast shaper (Peaking Time) 80 ns Minimum Threshold 40 kev (1.8fC) Threshold homogenity 4 kev (0.2fC) Time walk ( MeV) ~100 ns Time resolution σ < 1 ns Energy resolution (C det =60pF) 890 e - (sigma) Readout frequency 10 Mhz 6.3mm
36 Before threshold DAC-tuning Max diff. = 1.2 fc (27keV) After threshold DAC-tuning Max diff. = 0.2 fc (4keV) 90mm
37 MATE3 self-triggering front-end electronics: 64 (128) channel MATE 3 board 90mm Parameters of the MATE 3 front-end chip Number of channels 16 Technology 0.8 µm BICMOS Power supply ±2.5 V Power dissipation 30 mw/channel Linear energy range 50 MeV (± 2220fC) Slow shaper (Peaking Time) 1 µs and 3 µs Fast shaper (Peaking Time) 22 ns Minimum trigger threshold 0.4 MeV (8fC) Time resolution (E>1.5MeV) σ 0.3 ns Energy resolution (C det =60pF) σ = 1530 e - Readout frequency 2 MHz (energy & time) Common stop reset needed
38 3D-Modeling for Design and Engineering
39 Bond Technology
40 Laboratory Infrastructure Nitrogen low humidity boxes Mass spectrometer to check vacuum compatibility Clean room for assembly Test stations for checking electronics Test station for temperature training Vacuum chamber for test and storage
41 Key components to build the detection system: Detectors with front-end electronics. Cooling system for detectors, pre-amplifiers amplifiers, and front-end electronics in vacuum. DAQ system to provide control and read-out of front- end electronics. Trigger system HV Bias and Low Voltage power supply system Independent monitoring systems Monitoring and control software Interlock protection systems Data analysis
42 Silicon Tracking Telescope Cooled vacuum electronics Cooling feed-through Detectors Front-end Electronics
43 Silicon Tracking Telescope in the ANKE target chamber Cluster Target Beam COSY Beam
44 Detector Calibration: Energy Left Telescope Right Telescope E 1 (300µm) vs. E 2 (300µm) p d p d d d E 2 (300µm) vs. E 3 (5000µm) p p
45 Detector Calibration: Tracking
46 Science Result, a picture in particle physics Physics case, experience, infrastructure, and the right team.
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