• The schemes examined by the four working groups are:
• The laser wakefield accelerator (LWFA) in which a plasma wave is driven in the wake of an intense laser pulse; WG1 coordinators: Arnd Specka (CNRS), Dan Gordon (NRL), Carl Schroeder (LBNL)
• The plasma wakefield accelerator (PWFA) in which a plasma wave is driven in the wake of a high current particle bunch; WG2 coordinators: Allen Calwell (MPP), Mark Hogan (SLAC), Edda Gschwendtner (CERN)
• The dielectric wakefield accelerator (DWA) in which wakefields are driven in a dielectric tube by a high current particle bunch; WG3 coordinators: John Power (ANL), Paolo Craievich (PSI), Philippe piot (FermiLab)
• The direct laser accelerator (DLA) in which the accelerating field is driven by a short laser pulse in a dielectric structure; WG4 coordinators: Joel England (SLAC) , Joshua McNeur (U Erlangen) , Bruce Carlsten (LANL)
• Charge to the working groups:
• Identify scientific and technological bottlenecks of each scheme and their possible solutions to produce a TeV lepton collider.
• Detailed charge:
• Identify parameters/elements necessary for the scheme
• Determine to what extend they have been proved and demonstrated
• Evaluate likelihood and timescales for testing/proving solutions
• Identify key experiments to be performed
• Identify existing or new facilities to perform key experiments
• Identify realistic time scales
• Identify panorama, what is in the making?
