Part II: Detectors. Peter Schleper Universität Hamburg
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1 Part II: Detectors Peter Schleper Universität Hamburg
2 Outline of the lecture: 1. Overview on detectors 2. Particle interactions with matter 3. Scintillators and photon detectors 4. Semiconductor detectors 5. Gaseous detectors 6. Tracking and vertex detection 7. Calorimeters 8. Jet reconstruction 9. Particle flow 10. Collider detector systems 11. Non-collider detector systems Test exam - June 13 proposal, instead of lecture Exam - July 13, during lecture or exercise!2
3 Literature Large parts of this lecture are also based on lectures previously given by Ingrid-Maria Gregor, Roman Kogler, Alexander Schmidt and Georg Steinbrück at Hamburg University. Many thanks! These notes: (recently discovered particle) Introductory material: - Physics 5 lecture, literature therein and section 6 on detectors, Text books - H. Kolanoski, N. Wermes: Teilchendetektoren - K. Kleinknecht: Detectors for particle radiation - C. Gruppen: Particle detectors - W.R. Leo: Techniques for nuclear and particle experiments - T. Ferbel: Experimental Techniques in high energy physics Web links: - Particle data group: then look for Experimental Methods and Colliders!3
4 Detector requirements
5 ATLAS Cross Section Foto: CERN!5
6 ICECUBE neutrino detector at the south pole Foto: CERN!6
7 ICECUBE neutrino detector at the south pole Foto: CERN!7
8 Which detection principles are used here?!8
9 Detectors for medical imaging W.C.Röntgen, 1896 MRT (Wikipedia) positron emission tomography (PET) (Wikipedia) metal detector (Wikipedia)!9
10 Particle detector types and their usage Gaseous detectors Solid state detectors Ionisation chamber Geiger counter Spark chamber Proportional chamber Semiconductor Cerenkov counter Scintillator counter Multiwire proportional Silicon counter Time of flight Drift chambers Diamond counter Time projection Germanium counter Tracking detectors Calorimeter!10
11 Detector requirements Particle physics: understand interactions of particles at smallest possible distances and time scales example: high transverse momentum particles at LHC P x = 2 TeV ΔP x Δx = ħ e.g. measured resolved distance length scale: corresponding time scale: example: decay of a Z 0, W: width measured: mean characteristic decay length: mean lifetime: mean decay length: Δx = m Δt = sec Γ 2 GeV c τ = ħ c Γ τ Γ = ħ = 200 MeV fm 2 GeV τ = sec x = vt = βγcτ = P mc cτ = 0.1 fm!11
12 Detector requirements Interesting physics: - smaller than one proton radius - times much smaller than e.g. atomic processes Measurement process: - feature size of electronic processors: 65 nm - processing time for electric signals: 1 ns (GHz frequency) cannot directly see processes at smallest distances - weak processes, processes inside nucleons, free quarks, instead: measure secondary decay products - Z μμ, q Hadronen - reconstruct Z, quarks, from sum of 4-momenta of all decay products for each event, measure all individual quanta produced - particle type/mass, energy, momentum/velocity, polarisation, (if possible)!12
13 measuring particle properties particle type: - two measurements from E, P, β mass (provided resolution is good enough) E 2 = m 2 c 4 + P 2 c 2 E = γmc 2 P = γβmc - characteristic interaction with detector material: electromagnetic shower, no hadronic interactions momentum / charge: - curvature in magnetic field tracking detectors energy: - range in material - total energy deposited in material calorimeter velocity - time of flight between two measurements - ionisation, velocity threshold for cherenkov effect spin: angular distribution of decay products!13
14 } Physics of particle detectors 1) heavy charged particles (m > me) 2) electron / positron 3) photons 4) neutrons Jets: - collimated bunch of (mainly heavy charged) particles from the hadronization of a quark Neutrinos: - react very weakly with matter - Cross section for is around cm -2 - interaction probability in 1m iron: 10-17!14
15 Particle Physics Detectors!15
16 Monte Carlo simulation 1 GeV pion interaction in sandwich calorimeter MC simulation: powerful tool shower simulation of a 2 GeV electron Pb block - detector optimization - simulation of physics (data/mc comparison) - pattern recognition hits particles jets!16
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