... High Brightness RTM . ... Fig.1a: 70-MeV pulsed race-track microtron . Many applications require compact, inexpensive and efficient source of electron beam in energy range 10-100 MeV. ... Beam is focused by accelerating structure, which acts as RF quadrupole singlet, quadrupole triplets (12) installed at the even orbits return path and by electromagnet quadrupole singlet (9) installed at common axis. ... Fig.1b: 70-MeV RTM Schematic . ... Energy gain: 4.8 MeV / orbit . Orbits: 14 . ...