Hamburg 2016 – scientific programme

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T: Fachverband Teilchenphysik

T 57: Detektorsysteme II

T 57.9: Talk

Tuesday, March 1, 2016, 18:45–19:00, VMP8 SR 205

Advancements of Floating Strip Micromegas Detectors for Medical Imaging Applications — •Felix Klitzner¹, Otmar Biebel¹, Jonathan Bortfeldt¹, Bernhard Flierl¹, Lorena Magallanes^2,3, Katia Parodi^2,4, and Bernd Voss⁵ — ¹LS Schaile, LMU München — ²LS Parodi, LMU München — ³Universitätsklinikum Heidelberg — ⁴Heidelberger Ionenstrahl Therapiezentrum — ⁵Gesellschaft für Schwerionenforschung Darmstadt

Floating strip Micromegas have proven to be high-rate capable tracking detectors with excellent spatial and temporal resolution for particle fluxes up to 7 MHz/cm². To further increase the high-rate capability a Ne:CF₄ 86:14 vol.% gas mixture has been used as detector gas. We present results from measurements with a seven detector system constisting of six low material budget floating strip Micromegas, a GEM detector and a scintillator based particle range telescope. The gaseous and the scintillation detectors were read out with APV25 frontend boards, allowing for single strip readout with pulse height and timing information. A two-dimensional readout anode for floating strip Micromegas has been tested for the first time. The Micromegas detectors were operated with minimal additional drift field, which significantly improves the timing resolution and also the spatial resolution for inclined tracks. We discuss the detector performance in high-rate carbon and proton beams at the Heidelberg Ion Beam Therapy Center (HIT) and present radiographies of phantoms, aquired with the system.