PARTICLE DETECTOR WITH DIAMOND SENSITIVE ELEMENTS GROWN IN A CUBIC HIGH PRESSURE APPARATUS
Keywords:particle detectors, HPHT diamond, nuclear electronics.
Introduction. Diamond is one of the most suitable materials for particle detectors, due to a wide band gap and a high radiation resistance of this material. However, diamond sensitive elements for detectors remain rare and expensive, which hinders their widespread use in nuclear physics and medicine.
Problem Statement. In recent years, new technologies for growing HPHT diamonds in cubic presses have been developed. They have allowed obtaining up to 50 high-perfection single crystal diamonds weighing up to 10 carats in one cycle. However, the physical properties of HPHT diamonds grown in modern presses have not been sufficiently studied, and the results of the application of such diamonds in ionizing radiation detectors have been unknown so far.
Purpose. The development of a particle detector with sensitive elements based on HPHT diamonds grown in a cubic high-pressure apparatus and the study of its characteristics.
Materials and Methods. Growing diamonds by the temperature gradient method in a cubic high-pressure apparatus. Particle detector. Irradiation with alpha particles.
Results. The temperature gradient method has been used to grow 7—9 mm diamond single crystals in a cubic high-pressure apparatus, and 0.4 mm thick diamond plates have been made of cubic and octahedral growth sectors. The physical properties of the samples have been studied. The detector amplifier has been developed, and the
detector has been tested when irradiated with alpha particles. The results have showed reliable detection of ionizing events caused by alpha particles and the registration of induced pulses with an amplitude of 70—200 mV.
Conclusions. The particle detector with diamond plates made of cubic growth sectors of HPHT diamonds grown in a high-pressure cubic apparatus from the Fe-Ni-C growth system when irradiated with alpha particles has showed the ratio of full width at half maximum of pulse (FWHM) of about 1 ns, which corresponds to the world's best analogs of diamond detectors.
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