Passive Electrostatic Recycling Spectrometer of Desk-Top Size for Charged Particles of Low Kinetic Energy

Abstract

A passive electrostatic recycling spectrometer for charged particles is described and demonstrated to store electrons with typical kinetic energies of tens of eV. The design of the charged particle optics and the basic operating characteristics of the storage ring are discussed. The storage lifetime achieved is approximately 50 micros, which is target gas pressure limited and corresponds to approximately 200 orbits of the 0.65 m orbital circumference. The storage ring also has controllable energy dispersive elements enabling it to operate as a spectroscopic device.

Phase Space Dynamics of Relativistic Particles

“…An electron needs to be described by six real-valued variables (for its three position components and three velocity components), and each real-valued variable will cost~24 byte storage mount. For a realistic beam with a total charge at pC level, the number of realistic particles it contains will be about 10 À12 + 19 / 1.6~6.3 Â 10 7 and hence corresponds to 1.5 GB storage mount. If numerical experiment is conducted through a single-CPU computer, according to the most advanced personal computer currently available, 1.5 GB can be contained in the memory which is commercially available at 4 GB level.…”