Influence of the magnetic core on efficiency of the gauss gun

The following calculations were executed when I was projecting a multistage ball-firing coilgun, and trying to utilize a magnetic core in its construction. Slightly modified script http://coilgun.ucoz.ru/FEMM_calc/Stator/gauss_ver_2_5.lua for SCR-driven coilgun modelling was used. The tubular core (fig. 1) is suggested here with a coil inside it. Such form is chosen because:

- it is easy to make (for example by winding steel tape arong the coil)

- ts suitability for multistage systems where the coils must be placed end-to-end (so "traditional" core with its "cheeks" adjoining to the coils is not appropriate)

Fig. 1. Cross-section of the core modelled in initial (right) and adapted script (left).