Assessing the potentiality of the 250kV-SSAMS for stopping power measurements at low energies

Abstract

Abstract Since 2012, a compact 250 kV Single Stage accelerator (250 kV-SSAMS) has been installed at Instituto de Fisica, Universidade Federal Fluminense, for radiocarbon analysis of natural samples. The system presents two magnets, for mass selection prior and post the gas stripper, and an electrostatic spherical analyzer (ESA). The overall performance of the machine makes it suitable for experimental researches in atomic collisions, in particular for studies of the stopping power of atomic projectiles at energies below 25 keV/u. Here we report on the energy loss measurements of 12C + and 16O + ions in a thin carbon foil at energies in the range of 10 to 25 keV/u. Energies of the ions after the foil are determined from the high-voltage applied to the ESA in order to recover the maximum intensity reading in a Faraday Cup (FC) after the ESA. Energies of the ions after the foil are determined from the high-voltage applied to the ESA. With this technique, experimental data for the stopping power within a precision of about 0.5%.