5 research outputs found
Silicon Carbide Timepix3 detector for quantum-imaging detection and spectral tracking of charged particles in wide range of energy and field-of-view
The hybrid architecture of the Timepix (TPX) family of detectors enables the
use of different semiconductor sensors, most commonly silicon (Si), as well as
high-density materials such as Cadmium Telluride (CdTe) or Gallium Arsenide
(GaAs). For this purpose, we explore the potential of a silicon carbide (SiC)
sensor bump-bonded on a Timepix3 detector as a radiation imaging and particle
tracking detector. SiC stands as a radiation-hard material also with the
ability to operate at elevated temperatures up to several hundreds of degrees
Celsius. As a result, this sensor material is more suitable for radiation harsh
environments compared to conventional e.g., Si sensors. In this work, we
evaluate the response for precise radiation spectrometry and high-resolution
particle tracking of newly developed SiC Timepix3 detector which is built and
operated as a compact radiation camera MiniPIX-Timepix3 with integrated readout
electronics. Calibration measurements were conducted with mono-energetic proton
beams with energies of 13, 22, and 31 MeV at the U-120M cyclotron at the
Nuclear Physics Institute Czech Academy of Science (NPI CAS), Prague, as well
as 100 and 226 MeV at the Proton Therapy Center Czech (PTC) in Prague.
High-resolution pattern recognition analysis and single-particle spectral
tracking are used for detailed inspection and understanding of the sensor
response. Results include distributions of deposited energy and linear energy
transfer (LET) spectra. The spatial uniformity of the pixelated detector
response is examined in terms of homogeneously distributed deposited energy.Comment: 9 pages, proceedings iWoRi
Resolving power of pixel detector Timepix for wide-range electron, proton and ion detection
The resolving power of the Timepix detector for wide-range charged particle detection has been examined and evaluated in defined radiation fields. The goal is to broadly characterize mixed-radiation fields consisting namely of X-rays and charged particles in terms of particle-types (species), spectral response (energy loss) and direction in wide field-of-view (essentially 2????) with a single compact tracking detector. Tests and calibration measurements were performed with the same device at electron, proton and ion fields at various energies and incident directions. Event-by-event detection, together with pattern recognition analysis of the single particle tracks, are exploited to analyze events according to three degrees of freedom—the particle type (X-rays, light and heavy charged particles), energy range (low or high energy—depending on their range being smaller or larger than the pixel size of the detector semiconductor sensor) and direction (incident angle to the sensor plane). Characteristic values are determined for the cluster analysis morphology parameters, the particles stopping power or Linear Energy Transfer and derived correlated quantities. Ratios and correlations between selected parameters are analyzed including 2D-scatter plots. A physics-based wide-range classification is proposed for a total of 8 broad event groups—in terms of light charged particles (electrons, muons) of both low and high energy incident perpendicular (type 1, including X-rays) or high energy non-perpendicular (type 5), protons of low energy omnidirectional (type 2) and high energy non-perpendicular (type 6), alpha particles and light ions of low energy omnidirectional (type 3) and high energy non-perpendicular (type 7), and heavy ions of low energy omnidirectional (type 4) and high energy non-perpendicular (type 8)