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We present the calculations for electromagnetic design of a Beta_g = 0.61,multi-cell superconducting radiofrequency cavity for the Indian SpallationNeutron Source (ISNS) project. Geometry of the mid-cells is optimized using astep by step, one-dimensional optimization technique. This is followed by theoptimization of end-cells, which is done to achieve the required fieldflatness, as well as to avoid trapping of higher order modes. Calculations ofthe threshold beam current for the excitation of regenerative beam break upinstability excited by the dipole modes is also presented, which is followed bywake field calculations and estimation of its effects. Specific aspectsrelevant to design calculations for medium Beta_g cavities, compared to highBeta_g cavities are highlighted in the paper. Finally, studies are performedfor the static as well as dynamic Lorentz Force Detuning (LFD), based on whichthe stiffness design of the cavity is optimized.

On the Electromagnetic Design of a Beta_g= 0.61, 650 MHz Superconducting Radiofrequency Cavity