Abstract
We describe two applications concerning fast timing detectors and fast signal sampling in cosmic ray measurements in collaboration with NASA and in dose measurements for cancer treatment.
Highlights
THE idea is to discuss some applications to measure radiations using Fast Silicon detectors that are used in a standard way nowadays in high energy physics at CERN [1,2,3]
We will first describe the principle and methods of the technics that we use and describe in detail two applications related to measurements of cosmic ray in space in collaboration with NASA and of doses received by patients in cancer treatment especially in flash proton therapy
A schematic of this test is shown in Fig. 7 where we can compare the information from our ultrafast Silicon detector (UFSD) with the usual ion chambers commonly used in hospitals to measure doses delivered to patients
Summary
THE idea is to discuss some applications to measure radiations using Fast Silicon detectors that are used in a standard way nowadays in high energy physics at CERN [1,2,3]. The signal originating from the Silicon detector (or the diamond detector) is first amplified with very limited shaping (so without modifying the good timing properties of the signal such as its duration) This is performed using front end electronics designed at the University of Kansas using standard components [4]. It allows obtaining very precisely a time stamp when the signal (or in other words the particle) arrives in the detector (this is used to measure time-of-flight of particles in high energy physics with a precision of 15-20 picoseconds) It allows reconstructing the full amplitude and shape of the signal by performing an interpolation between the sampled points (there can be 64 points in a few nanoseconds) if the signal is short in time. We installed a full test stand at the University of Kansas allowing to test the performance of the Si detectors and their electronics and preliminary measurements showed resolutions between 15 and 20 picoseconds for ultra fast Silicon detectors as an example
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