Strong terahertz fields: interaction with condensed matter and electron acceleration Yu.A. Sergeev, I.V. Oladyshkin, S.B. Bodrov, A.I. Korytin, M.D. Tokman, S.V. Kuzikov, A.A. Vikharev and A.N. Stepanov EPJ Web Conf., 149 (2017) 05009 Published online: 04 August 2017 DOI: 10.1051/epjconf/201714905009