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THz radiation is one of the most appealing portion of the electromagnetic spectrum in terms of multi-disciplinary use in basic science and technology. Beyond the numerous applications, a great interest is its potential for future, compact linear accelerators. Conventional radio-frequency accelerating structures operating at the S and C band can reach gradients up to 30 - 50MV/m, respectively; higher accelerating gradients, of the order of 100MV/m, have been obtained with X-band cavities. THz-based accelerating structures enable operation at even higher gradient, potentially up to the GV/m scale, holding great potential for their application to free-electron lasers and linear colliders, for instance. Here we present electromagnetic and beam dynamics studies about the use of a dielectric loaded waveguide to accelerate electron bunches by mean of a narrow-band multi-cycle THz pulse. The excitation of the accelerating structure by the THz pulse and the bunch acceleration in the excited field are investigated through CST Microwave Studio and GPT simulations.

Electromagnetic and beam dynamics studies for high gradient accelerators at terahertz frequencies / Marongiu, M.; Chiadroni, E.; Croia, M.; Ferrario, M.; Ficcadenti, L.; Lupi, S.; Martinelli, V.; Mostacci, A.; Pompili, R.; Tofani, S.. - In: JOURNAL OF PHYSICS. CONFERENCE SERIES. - ISSN 1742-6588. - 1596:1(2020). ((Intervento presentato al convegno 4th European Advanced Accelerator Concepts Workshop, EAAC 2019 tenutosi a Isola d'Elba, Italia [10.1088/1742-6596/1596/1/012029].

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