# CERN Accelerating science

 Thesis Report number CERN-THESIS-2016-163 ; ETH-23725 Title CVD Diamond Sensors In Detectors For High Energy Physics Author(s) Bachmair, Felix Caspar (Zurich, ETH) Thesis note PhD : Zurich, ETH : 2016 Thesis supervisor(s) Wallny, Rainer ; Trischuk, William Note Presented 19 Oct 2016 Subject category Detectors and Experimental Techniques Accelerator/Facility, Experiment CERN LHCCERN R&D ; RD42CERN SPS Abstract At the end of the next decade an upgrade of the Large Hadron Collider (LHC) to High Luminosity LHC (HL-LHC) is planned which requires the development of new radiation tolerant sensor technology. Diamond is an interesting material for use as a particle detector in high radiation environments. The large band gap ($5.47\,\text{eV}$) and the large displacement energy suggest that diamond is a radiation tolerant detector material. In this Thesis the capability of Chemical Vapor Deposition (CVD) diamond as such a sensor technology is investigated. The radiation damage constant for $800\,\text{MeV}$ protons is measured using single crystalline CVD (scCVD) and polycrystalline CVD (pCVD) diamonds irradiated to particle fluences up to $12 \times 10^{15}\,\text{p/cm}^2$. In addition the signal response of a pCVD diamond detector after an irradiation to $12 \times 10^{15}\,\text{p/cm}^2$ is investigated to determine if such a detector can be operated efficiently in the expected HL-LHC environment. By using electrodes embedded in the bulk material (3D detector geometry) it is possible to reduce the drift distances of charge carriers in a detector material. This results in an increased signal response for materials with a limited charge carrier lifetime, for example irradiated sensors. The results of a scCVD and a pCVD diamond detector using the 3D geometry are presented. Furthermore the sensitivity of irradiated diamond detectors to particle flux is determined for particle fluxes up to $10\,\text{MHz}/\text{cm}^2$

Corresponding record in: Inspire
Email contact: felix.caspar.bachmair@cern.ch

Zapis kreiran 2016-11-11, zadnja izmjena 2019-06-03

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