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High power ($\sim 100$ kW) industrial electron linear accelerators (linacs)are used for irradiation applications e.g., for pasteurization of foodproducts, disinfection of medical waste, etc. We propose that high powerelectron beam from such an industrial linac can be first passed through anundulator to generate powerful terahertz (THz) radiation, and the spentelectron beam coming out of the undulator can still be used for industrialapplications. This will enhance the utilisation of a high power industriallinac. We have performed calculation of spontaneous emission in the undulatorto show that for typical parameters, continuous terahertz radiation havingpower of the order of $\mu$W can be produced, which may be useful for manyscientific applications.

Terahertz radiation source using an industrial electron linear accelerator