Input (grade 10): He, working with I.M. Kapchinsky, invented the principle of the radio frequency quadrupole (RFQ), which revolutionized the acceleration of low energy ion beams.
Output (grade 7): He, working with his friend I.M. Kapchinsky, created the Radio Frequency Quadrupole (RFQ) principle, which was very important dealing with the speed of low energy ion beams.