PISTIL, a reactivity modulation device to probe the transfer function of the nuclear reactor CROCUSYifeng Jiang, Benoit Geslot, Vincent Lamirand, Pierre Leconte, Daniel Godat, Laurent Braun, Pavel Frajtag, Christine Coquelet-Pascal and Andreas PautzEPJ Web Conf., 253 (2021) 04007DOI: https://doi.org/10.1051/epjconf/202125304007