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16-19 January 2018
Zurich, Switzerland
Europe/Berlin timezone

Low material budget beam monitoring with optically read out GEMs

19 Jan 2018, 09:20
ETH HG E 1.2 (Zurich, Switzerland)

ETH HG E 1.2

Zurich, Switzerland

Rämistrasse 101, 8092 Zürich, Schweiz


Mr Florian Brunbauer (Technische Universität Wien, CERN)


Optically read out Gaseous Electron Multipliers (GEMs) are well suited for online monitoring of particle beams in high energy physics as well as medical fields. The high gain factors achievable by GEMs and the good spatial resolution enabled by state-of-the-art CCD or CMOS imaging sensors permit accurate beam profile and position monitoring over a wide range of beam energies, particle fluxes and for different types of beams. The low material budget achievable with optically read out gaseous detectors minimises the impact on traversing beams and makes them well suited for online monitoring applications. Furthermore, direct visualisations of beams can be obtained from imaging sensors without the need for extensive image reconstruction algorithms. This enables online beam monitoring with refreshing rates of tens of Hz limited by the frame rates achievable by employed imaging sensors. Test beam results of optically read out GEM-based detectors in muon and pion beams at the SPS test beam facility at CERN are presented and integrated beam profile images as well as temporally resolved imaging capabilities are shown. In addition, an optically read out low material budget detector was operated in proton pencil beams at a hadron therapy clinic and the applicability of the presented concept for beam monitoring and characterisation in proton therapy is investigated.

Primary author

Mr Florian Brunbauer (Technische Universität Wien, CERN)

Presentation Materials