Click to edit Master title style IEEE short course Calorimetry Erika Garutti (DESY Hamburg, Germany) Michele Livan (University of.

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Presentation transcript:

Click to edit Master title style IEEE short course Calorimetry Erika Garutti (DESY Hamburg, Germany) Michele Livan (University of Pavia, Italy) Frank Simon (MPI Munich, Germany) 21/10/2011IEEE short course: Calorimetry1

Click to edit Master title style Technical information 21/10/2011IEEE short course: Calorimetry2

Click to edit Master title style Outline of the course 21/10/2011IEEE short course: Calorimetry3

Click to edit Master title style Particle detection High energy physics (but also photon-science, nuclear medicine, homeland security) is concerned with the detection of particles The detector sees only “stable” particles: – Electrons, muons, photons, pions, kaons, protons and neutrons In order to detect a particle, it has to interact - and deposit energy Ultimately, the signals are obtained from the interactions of charged particles Neutral particles (gammas, neutrons) have to transfer their energy to charged particles to be measured  calorimeters 21/10/2011IEEE short course: Calorimetry4

Click to edit Master title style Particle detection 21/10/2011IEEE short course: Calorimetry5

Click to edit Master title style E e-e- S optical thermic electric acoustic S  E Convert energy E of incident particles to detector response S: Calorimetry: a simple concept particle showers 21/10/2011IEEE short course: Calorimetry6

Click to edit Master title style Homogeneous vs non-homogeneous e-e- S E Ideal calorimeter: Contain all energy of one particle+ Convert all energy into measurable signal  Homogeneous (i.e. crystal) In practice: Homogeneous calorimeter only possible for electrons (shorter showers) Sometimes too expensive also for electrons Lateral segmentation possible but (so far) no depth information Alternative solution  Sampling calorimeter Contain all energy of one particle + Sample its energy during shower development ( E visible  E total ) Many different designs - calorimeter imbiss: sandwich, shashlik, spaghetti - liquid versions: LAr - … 21/10/2011IEEE short course: Calorimetry7

Click to edit Master title style How to “look” at the signal 1)Convert particle energy to light: scintillator (org. / in-org.) &measure light: PMT / APD / HPD / SiPM … 2)Measure ionization E: gas noble liquids semiconductors & measure charge signal 3)Measure temperature: specialized detectors for: DM, solar s, magnetic monopoles, double  decay very precise measurements of small energy deposits phenomena that play a role in the 1 Kelvin to few milli-Kelvin range 21/10/2011IEEE short course: Calorimetry8

Click to edit Master title style Choosing a calorimeter Many factors: Choices: active, passive materials, longitudinal and lateral segmentation etc. Physics, radiation levels, environmental conditions, budget CAVEAT: Test beam results sometimes misleading Signals large integration time or signal integration over large volume could be not possible in real experimental conditions Miscellaneous materials (cables, support structures, electronics etc.) present in the real experiment can spoil resolution Jet resolution not measurable in a test beam 21/10/2011IEEE short course: Calorimetry9