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00 channel scalar 0FHC copper amps antimatter apparatus applied field atom axis background gas calculated cathode magnet chapter charge q charged particles collisions contact potential differences cross section curve cylinder data of figure data taken delayed pulse detector entrance grid dewar diameter diffusion pump distance distribution of flight drift tube dynode electric field electrostatic potential emission emitted electrons emitting film energy distribution energy range experimental data extraction aperture fast electrons feedthroughs figure 13 figure 21 flight distribution gases gauge gauss gold film gravitational force gravitational potential ground state electrons guide magnet guide solenoid insulated interaction ion pump ions formed kinetic energy length liquid helium magnetic energy magnetic field gradients magnetic potential measurements meters milliseconds msec negative ions patch potential energy pressure radius result semilog plot shield shown in figure signals slow electrons space charge superconducting surface torr trapped tunnel cathodes tunnel diode vacuum voltage volts