IPAC'23 - Student Poster Session Guide

IPAC’23 / STUDENT POSTER SESSION GUIDE 51 Student Poster Session sputtering at a substrate temperature of 700 K have been irradiated with 100 MeV Ag8+ ions from 15 MV Pelletron accelerator at three different fuence. Glancing angle X-ray diffraction (GAXRD), Atomic Force Microscopy (AFM), Field Emission Scanning Electron Microscopy (FE- SEM) and Raman spectroscopy of the films have been performed to determine structural and morphological changes due to ion irradiation. GAXRD of the pristine and irradiated thin films reveal the reduction in grain size and loss of crystallinity with ion irradiation. FESEM images of the thin films showed no significant change in surface morphology and the thin film continuity is maintained even after ion irradiation of higher fuence. Raman spectroscopy of the WC thin films shows the decrease in intensity of peaks corresponding to Raman shift resulting in the de- crease in polycrystalline nature of WC upon ion irradiation. Further, thermal spike calculations are also done to estimate the evolution of lattice temperature with ion irradiation. SUPM097 Ruthenium ion modification of glassy carbon: implication on the structural evolution and migration behaviour of implanted Ru atoms Tasabeeh Alabid Jafer (University of Pretoria) . Ali Abdelbagi Hesham Abdelbagi, Johan Malherbe (University of Pretoria). Glassy carbon samples were implanted with ruthenium ions to a fuence of 1×10^16 cm^-2 at room temperature (at 150 keV). The implanted samples were annealed isochronally in vacu- um from 1000 to 1300 °C for 5 hours. The resulting microstructural changes were investigat- ed using X-ray diffraction (XRD), Raman spectroscopy and atomic force microscopy (AFM). The diffusion behaviour of ruthenium in glassy carbon was investigated using Rutherford back- scattering spectrometry (RBS). Raman results showed that the implantation of ruthenium into glassy carbon caused amorphization and increase the tensile stress in the implanted region. XRD showed that the amount of tensile stress in virgin glassy carbon increased from 0.016 GPa to 0.19 GPa after ion implantation which is in qualitative agreement with the Raman results. Annealing of the samples exhibited more recrystallization and changed the tensile stress to compressive stress. RBS results showed that annealing of the as-implanted samples at 1000 °C caused aggregation of the ruthenium atoms, while annealing at higher temperatures led to some segregation of ruthenium atoms at a depth of 155 nm below the glassy carbon surface. The aggregation of ruthenium atoms after annealing (as observed by RBS) played a role in the surface roughness as observed by AFM. SUPM098 A nanosecond power supply for grid-controlled electron guns Chunyu Xu (University of Science and Technology of China) . Feng-lei Shang, Lei Shang, Wen Song (University of Science and Technology of China). Grid-controlled electron gun usually uses specially designed power supplies to supply power, the performance of the power supplies can directly affect the beam performance of the accel- erator. In this paper, a nanosecond power supply for a grid-controlled electron gun is designed. It uses avalanche transistors and superimposes Marx generators to improve the power. Finally, its rise edge is less than 1 ns. The power supply can be used in the thermal cathode grid-con- trolled electron gun, the electronic source scheme of Hefei Advanced Light Facility (HALF), which is practical and feasible.