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The Pulsed RF Heating (PRFH) is the well known effect in the development ofhigh gradient accelerating cavities. There is a lot of research dedicated tothe tolerable strength of electromagnetic field and the correspondingtemperature rise leading to the surface degradation and cavity performanceviolation. To provide high quality of electron bunches, RF gun cavities operatein electron sources with high electric, and hence, magnetic RF fields. Being atthe safe side with respect to cavity surface degradation, related to the PRFHresult for S band in essentially transient thermal deformations, leading to thecavity frequency shift and quality factor change even within a few microsecondsin the RF pulse. Thermo-elastic deformations consist of slow heat propagationfrom the cavity surface and fast elastic wave propagation from the very thinheated surface layer inside the cavity body with different in five orderstypical velocities. For simulations of PRFH effects for more or less practicalcavity design we can get results only in direct numerical simulations withcertified software like ANSYS. The critical issue for such direct simulationsis to combine in a single model the possibility of correct description for suchqualitatively different process and to prove the reasonable precision ofsimulations. This report describes the procedure for simulation of PRFH relatedtransient thermo-elastic deformations in S band cavities. The results of testsimulations are presented to show the relative precision of simulations.

Procedure of simulations for Evaluations of Transient Parameters Stability for RF Cavities Due to Effects of Pulsed RF Heating