The next major step towards the modern SRF ERL was
taken at Jefferson Lab’s (JLab) IR and UV FEL [6, 7]. This is
a SRF ERL operation in a CW mode, with recovery in the
same cell, and a current record of up to 10 mA was achieved
at energy of up to 100 MeV. This ERL will be described in
greater detail later on.