Petr Malinský on the "Hedgehog": a German system for RBS-channeling

On Thursday, September 8, from 10:15 a.m., NPI seminar was held by RNDr. Petr Malinský, Ph.D., from our Department of Neutron Physics. The seminar was named "Hedgehog" - a system of Si-PIPS detectors for RBS-channeling with a total solid angle of 680 mSr.

During his six-month internship at the Ion Beam Center at the Helmholtz-Zentrum Dresden-Rossendorf in Germany, Petr Malinský worked on the development, installation and testing of the "Hedgehog" system, designed for measuring by the Rutherford back-scattering spectrometry in channel mode (RBS-C). Thanks to the increase in the solid angle of the detector, the "hedgehog" significantly increases the probability of detecting back-scattered ions, and enables, compared to the standard RBS-C, more sensitive, faster and better quality analysis of crystalline structure .

During the installation of the detector, Petr Malinský participated in the preparation of software for individual digital multi-channel analyzers and for main control computer. The main task was to coordinate the time sequence of the communication of individual detectors with the five-axis goniometer, charge integrator and control computer; optimization of the measurement process; calibration of individual detectors and testing of the final version of the device on real samples. All problems were successfully overcome. Single crystals of ZnO, both unmodified and implanted with Au and O ions, were used for testing. The results were then compared with RBS-C measurements on one detector, which is available in the Laboratory of Tandetron at NPI.

The internship was supported by the Physicists in the Move II. project (KINEO II.).