Design of a parallel-plate energy spread analyzer

A 45° parallel-plate energy spread analyzer has been designed and built for the ISAC project at TRIUMF. It features an energy resolution of $\text{⩽0.04\%}$ and a spectrometer constant of $\text{k=1.29.}$ Nineteen 0.1 mm by 10 mm metal guard frames with 1 MΩ resistors are used to equalize the electric field in the analyzer to an order of $\text{⩽0.5\%.}$ Electric field simulation is done by a code POISSON . This article describes the design of the analyzer. Preliminary experimental results are also presented.