The design of eV Parts is based on the idea that most high vacuum apparatus can be constructed out of standardized parts, in a manner similar to that used in the construction of electronic apparatus (using standard resistors, capacitors, switches, etc.). Because standardization greatly reduces the draftsmen, machine shop, and technician time required to set up an experiment, costs can be greatly reduced.
The design philosophy is to construct all complicated shapes with metal and to use simple insulator parts. This philosophy has been followed for three reasons: 1) The high availability of metal working tools and raw metal stocks facilitates making special shapes or reworking existing shapes in metal. 2) It generally costs more to make high quality insulator parts than to make similar shapes out of metal. 3) Keeping ceramic parts simple and small makes it easier to protect them from the contamination and charge-up effects which often result from particle bombardment. Holding down the amount of exposed insulator surface reduces the stray fields generated when such charge-up occurs.
Each part has been designed with the highest possible symmetry consistent with its basic function. This was done to permit fitting parts together in the maximum number of ways.