Abstract
This paper presents the design of magnetic coil for relativistic magnetron (RM) for LIA (Linear Induction Accelerator)-400 systems. Vacuum improves the efficiency of RM for HPM generation. Magnetic field in RM is very critical parameter and should be nearly constant in the active region [1, 2]. Typical coils are helical in nature, which have multi turns of varying radius. Magnetic field calculation of such coils with basic equations of Helmholtz coils or solenoid with mean radius can only give estimation. Field computational softwares like CST require small mesh size and boundary at very far so consume large memory and take very much time. Helical coils are simplified such that the basic law of magnetic field calculation i.e. Bio-savart law can be applied with less complexity. Pairs of spiral coils have been analyzed for magnetic field and Lorentz's force. The approach is field experimentally validated.
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