Speaker
Dr
Vladimir Eremin
(Ioffe Physical Technical Institute RAS)
Description
The NUSTAR experiments in program FAIR (Facility for Antiproton and Ion Research) that are developed now in GSI require unique spectrometers for heavy ions which energy is ranged starting from hundred keV up to hundreds MeV. The spectrometers are constructed on the basis of silicon double sided detectors which must provide the energy and the hit point position.
The double sided detectors for simultaneous high resolution ions spectroscopy and tracking were developed within the framework of PTI and RIMST collaboration. The scaled reduced sizes samples of the detectors were studied with 241Am source in terms of their spectrometric performance at different specific points of the detector. The best energy resolution of 14.7 keV was measured at the crossing point of the p+ and n+ strips. It was shown that the spectrum for the particles hit to the inerterstrip gap is much broader and has two maxima at the high and low energy edges.
In this study the shape of the short range particle spectra is explained in terms of the potential distribution at the surface of the passivated interstrip gap which has a saddle point at the center of the gap underneath the surface. Thus the effective entrance window thickness in the interstrip gap is modulated by the potential distribution that produces a specific shape of the detector spectral response. It is shown that this effect can be minimized by the interstrip gap construction however it is still important for the detection of low energy ions even at high bias voltage The position of potential saddle point depends on the electric field at the neighboring strips. The results should be considered in the spectra treatment and can be used in the future developments of spectrometric detectors for nuclear physics.
Preferred medium (Oral/poster)
oral
Author
Dr
Vladimir Eremin
(Ioffe Physical Technical Institute RAS)
Co-authors
Dr
Elena Verbitskaya
(Ioffe Physical Technical Institute RAS)
Igor Eremin
(Ioffe Physical Technical Institute RAS)
Nadezda Fadeeva
(Ioffe Physical Technical Institute RAS)
Nicolai Egorov
(Research Institute of Material Science and Technology)
Dr
Yuri Tuboltsev
(Ioffe Physical Technical Institute)
