Experimental Medical Physics

Breadcrumb Navigation


Gaseous Detectors


Our research on gaseous detectors is focused on micro-pattern gaseous detectors of the Micromegas type. These are planar tracking detectors, suitable for accurate particle position measurement with typical spatial resolutions of 60μm and better. Thanks to short ion-draft paths and fast signal generation mechanisms, these detectors are high-rate capable and reliably detect individual particles at hit rates of 10MHz/cm2 and above.


We are currently working on floating strip Micromegas tracking detectors with a material budget below 0.4mm water equivalent and the Micromegas readout of a small Time Projection Chamber, both intended for a small animal ion range imaging system. An ion range imaging system relies on the spatially resolved measurement of the energy loss of transmitted particles in the imaged patient or object. Usually, a mono-energetic particle beam traverses the imaged object, particle positions in front of and behind the object are measured with spatially resolving particle detectors such as Micromegas; the residual particle energy behind the object is then measured with a suitable calorimeter or range detector and yields the image contrast information.

We are also involved in the development of Picosec, a fast timing Cherenkov based Micromegas detector, that has recently demonstrated a timing resolution below 25ps for minimum ionizing particles.

Our research on gaseous detectors profits enormously from our new infrastructure, consisting, besides others, of an ISO3 and ISO5 clean room.


Dr. J. Bortfeldt


J. Bortfeldt, F. Brunbauer, C. David, D. Desforge, G. Fanourakis, J. Franchi, M. Gallinaro, I. Giomataris, D. González-Díaz, T. Gustavsson, C. Guyot, F.J. Iguaz, M. Kebbiri, P. Legou, J. Liu, M. Lupberger, O. Maillard, I. Manthos, H. Müller, V. Niaouris, E. Oliveri, T. Papaevangelou, K. Paraschou, M. Pomorski, B. Qi, F. Resnati, L. Ropelewski, D. Sampsonidis, T. Schneider, P. Schwemling, L. Sohl, M. van Stenis, P. Thuiner, Y. Tsipolitis, S.E. Tzamarias, R. Veenhof, X. Wang, S. White, Z. Zhang, Y. Zhou; Charged particle timing at sub-25 picosecond precision with a Micromegas based detector; Nucl. Instr. and Meth. in press (2018)

J. Bortfeldt, O. Biebel, B. Flierl, R. Hertenberger, F. Klitzner, Ph. Lösel, L. Magallanes, R. Müller, K. Parodi, T. Schlüter, B. Voss, A. Zibell; Low Material Budget Floating Strip Micromegas Detectors for Ion Transmission Radiography; Nucl. Instr. and Meth. A 845 (2017) 210-214

J. Bortfeldt, M. Bender, O. Biebel, H. Danger, B. Flierl, R. Hertenberger, Ph. Lösel, S. Moll, K. Parodi, I. Rinaldi, A. Ruschke, A. Zibell; High-Rate Capable Floating Strip Micromegas Detectors; Nucl. Part. Phys. Proc. 273-275 (2016) 1173-1179

Currently funded projects:

2016-2019, Grant 665779, as part of the COFUND-FP-CERN-2014 program, funded by EU via Marie-Skłodowska-Curie individual fellowship, PI: J. Bortfeldt