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Multipacting is seen as a performance limiting phenomenon for thesuperconducting radio frequency (SRF) cavities. Numerical simulations areessential to pre-empt the experimentally observed multipacting conditions.Readily available codes(e.g. FISHPACT, MULTIPACT,CST etc.) are widely used tosimulate the phenomenon of multipacting in such cases. Most of the contemporarytwo dimensional (2D) codes are unable to detect multipacting in the ellipticalcavities because they use a simplistic secondary emission model, where aconstant value of emission kinetic energy of secondary electrons is assumed.Some three-dimensional (3D) codes, which use a more realistic and sophisticatedsecondary emission model (Furman model) by following a probability distributionfor the emission kinetic energy of secondary electrons, are able to correctlypredict the occurance of multipacting. These 3D softwares however require largedata handling and are slower than contemporary 2D codes. We have developed a 2Dcode for the multipacting analysis for axisymmetric structures, which is basedon the Furman model. Since our code is 2D, it is faster than the 3D codes. Thismakes it possible to perform an accurate multipacting analysis of multipactingwithin a resaonalble computational time, thus achieving an accuracy as good asin the case of 3D codes, but requiring significantly less computing time. Wehave used our code for determining the multipacting prone range of values forEacc in beta_g =0.61 and beta_g =0.9, 650 MHz mid-cell elliptical cavities thatwe have recently designed for the medium and high energy section of theproposed Indian Spallation Neutron Source (ISNS) project.

Multipacting studies of beta_g=0.61 and beta_g =0.9, 650 MHz Elliptical SRF Cavities