It is necessary to place an instrument on the EG-5 light ion accelerator to monitor the change of the structure parameters and the evolution of the defects during the irradiation of the samples. For this purpose, we rely on a coincidence scheme considering the positron lifetime. 2 BaF2 detectors, photomultipliers, an analog-to-digital converter analyzing the signal and a computer with software adapted to it are needed. The implementation specificity of this assay requires, under certain circumstances, the introduction of a temperature gradient. A hydraulic part is planned for the system to add an isotope of the element that will be converted into a positron source.

Tasks

1 To provide source material, upon irradiation of which a product will be obtained - a source of positrons. 2 Preparing of detectors and equip the entire matching scheme by testing. 3 Implementation of temperature gradient and hydraulic system.

Preliminary schedule by topics/tasks

The student's task will consist of familiarization with the experimental setup and the main positions when working with it. Participation in the implementation of the device and work on adding a temperature gradient to it and hydraulic system.

Required skills

experience working on experimental instruments.

Acquired skills and experience

At the end of the project, the student should be able to perform a similar task on his own, given the necessary conditions.

Recommended literature

https://www.positronannihilation.net/index_files/Positron%20Lifetime%20Spectroscopy.pdf