“…The present work also demonstrates the application of the Compton polarimetry technique, which provides advantages over Bragg polarimetry, previously used for DR polarization measurements at EBITs [23][24][25], by measuring both the degree and the angle of polarization and by being applicable in a broad range of energies. This technique can also be applied to investigate polarization properties of other electron-ion collision processes such as resonant recombination [38,66] and excitation, radiative recombination [36,67,68], electron impact excitation [26][27][28][29][30][31][32]69], nuclear-field-induced excitation [70] and higher-order resonant recombination processes [71,72]. Due to its high sensitivity, Compton polarimetry can also be used for studies of weak radiative transitions, or, alternatively, for high accuracy studies of stronger transitions, in particular of those sensitive to effects of quantum electrodynamics [73].…”