The Compact Linear Accelerator for Research and Applications (CLARA) is a 250
MeV ultrabright electron beam test facility at STFC Daresbury Laboratory. A
user beam line has been designed to maximise exploitation of CLARA in a variety
of fields, including novel acceleration and new modalities of radiotherapy. In
this paper we present the specification and design of this beam line for Full
Energy Beam Exploitation (FEBE). We outline the key elements which provide
users to access ultrashort, low emittance electron bunches in two large
experiment chambers. The results of start-to-end simulations are reported which
verify the expected beam parameters delivered to these chambers. Key technical
systems are detailed, including those which facilitate combination of electron
bunches with high power laser pulses.Comment: 13 pages, 12 figure