Abstract
The top hat electrostatic analyzer is widely used to measure ion and electron fluxes variation in the relatively small region of space. The goal of this investigation is to report our findings about the difference of the analyzer constant K determined by two methods that are respectively the theory (Kthe) and simulation (Ksim). Firstly, an analyzer is designed with the radius R1 = 30 mm and the gap d = 2 mm, and the performance parameters of analyzer are obtained, including the analyzer constant K, energy resolution Δ E/Ek, and pixel geometric factor GF through the theory model and simulation. Since the analyzer constant K can be obtained both from theory (Kthe) and simulation (Ksim), a difference between the two has been obtained and, in particular, Kthe has resulted greater than Ksim. Analyzing the structure of top hat electrostatic analyzer, we drew as a conclusion that the non-uniform electrostatic field in the region of top hat accelerates the incident ions and generates the difference for the analyzer constant K. To analysis and take into account the difference between Kthe and Ksim, a function f(R0/d), which depends on the design parameters, are derived from the simulated results.
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