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The paper presents a design of a W-band planar accelerating structure (muffin tin) [1]. The structure is a 2 /3-mode traveling wave, constant impedance structure with an operating frequency of 91.392 GHz. The design includes a new power coupler and a cavity geometry optimized for high shunt impedance. A 7–cell cold test prototype has been fabricated by wire electro discharge machining. Measurem...

In this study, the effect of input parameters of Electro Discharge Machining (EDM) process including polarity, peak current, pulse on time, duty cycle, gap voltage and concentration of abrasives powder in dielectric fluid on surface roughness are experimentally investigated. A L18 Taguchi’s standard orthogonal array is used for experimental design. Copper is used as tool electrode to machine H1...