SMI Seminar on fundamental interactions and symmetries

Silicon Technologies for Future Collider Experiments

by Mr. Florian Pitters (CERN)

Wednesday, 13 June 2018 from to (Europe/Vienna)
at SMI - Boltzmanngasse 3, 1090 Wien ( 3-2-08 - Seminarraum )

Florian Pitters CERN

date to be confirmed (alternatives: 20.6., 27.6.)


Over the past 30 years, silicon as a detector material has steadily increased in importance for high energy physics. For future detectors, this trend seems to continue if not accelerate.

For CLIC, a future 3 TeV e+e- collider, the desired energy and momentum resolution together with the flavour tagging performance will require the vertex detector to provide around 3 µm spatial and 3 ns time resolution at a material budget of 0.2 X0 per layer. Several technologies including monolithic silicon pixel detectors and capacitive coupled devices are currently under consideration to fulfill these requirements.

For the HL-LHC phase, the CMS endcap calorimeter upgrade will employ more than 600 m2 of silicon pad sensors. It has to survive fluences of up to 1016 neq/cm2 and to retain excellent physics performance at pile-up levels of up to 200. To reach this goal, a highly granular and compact calorimeter with precise timing capabilities and unprecedented radiation hardness is needed.

The role of silicon detectors in these two future collider experiments with very different experimental and technological challenges will be discussed. Results from R&D and prototyping campaigns to meet these challenges will be presented. Finally, three specific topics relating to silicon detectors will be discussed: 

  1. the calibration of pixel readout ASICs employing time-of-arrival and time-over-threshold measurements;
  2. the efficient characterisation of silicon pad sensors for large calorimeter projects;
  3. a testbeam analysis showing the potential of silicon to reach time resolutions below 20 ps in a calorimeter environment;