Experiments using extreme parameters of the NovoFEL radiationV. V. Kubarev, Ya. V. Getmanov, O. A. Shevchenko, E. N. Chesnokov, P. V. Koshlyakov and L. N. KrasnoperovEPJ Web Conf., 195 (2018) 07004DOI: https://doi.org/10.1051/epjconf/201819507004