New electrostatic energy analyzer for space plasma measurements

New electrostatic energy analyzer based on a cylindrical bounded field, intended for measurements of parallel flows of charged particles is described. The focusing field of this analyzer is a solution of a Laplace equation ∇2U(R,Z) = 0 with boundary conditions U(R1,Z) = U(R,0) = U(R,L) = 0 and U(R2,Z) = V and restricted by concentric cylindrical surfaces of radii R1, R2 and two flat surfaces perpendicular to the axis of symmetry. Regimes with a second -order focusing mode for several configurations with a different relative radius β = R2/R1 were found and energy function shape and energy resolution ability were calculated. Combination of high energy resolution ability with high transmission and simple design makes this instrument very promising for a wide area of scientific and technological applications, in particular, for space plasma measurements