Speaker
Mr.
Angel Perea Martinez
(IEM/CSIC)
Description
In the framework of FAIR/R3B for the construction of the CALIFA spectrometer end cap
There is a need of high dynamic range and calorimetric detection of both protons
and gamma rays. This cannot be easily achieved with standard scintillators, so it is
a field for novel solutions and materials.
Our proposal of a phoswich LaBr/LaCl configuration is attractive because of the high stopping
power and high light yield of these materials, along with the fact of being optically compatible
(i.e the latter being transparent to the scintillation light of the first one). This relaxes the
need for completely stopping the particle to get its energy. In a phoswich configuration (2
different crystals shinning on a single PM), the different decay times of both scintillators
produce changes in the shape of the light signal.
FPGA online processing running simple algorithms make possible to reduce this large
stream of data in real time to a small set of parameters, including the energy and nature of
the particle.
The compact detector thus created allows very portable solutions to be deployed in a variety of
situations: homeland security scenarios, imported goods screening or enviromental
natural radiation studies, among others.
Our current prototype is an arrangement of 4 phoswich xtals (2x2cm, 6+4cm LaBr+LaCl) sampled at
5 Gigasamples/sec 14bit 34 channels ADC (CAEN 1742). We present the results of the last
protype test done in Krakow as of March 15th 2013.
Oral or poster presentation | Oral |
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Primary author
Mr.
Angel Perea Martinez
(IEM/CSIC)
Co-author
Prof.
Olof Tengblad
(IEM/CSIC)