Operated by Los Alamos National Security, LLC for NNSA Dmitry Yu. Shchegolkov, Evgenya I. Simakov Los Alamos National Laboratory, Los Alamos, NM DWA as a possible MaRIE afterburner AWA outreach meeting via ReadyTalk June 5th, 2014

Operated by Los Alamos National Security, LLC for NNSA MaRIE Matter-Radiation Interactions in Extremes is going to be a LANL future signature facility. MaRIE will have an X-ray FEL. Currently the design of the accelerator for the FEL is the main research task. The required parameters are:  electron bunch charges of 0.1 to 1 nC;  normalized rms emittances of 0.1 to 1 mmmrad;  and rms energy spreads of less than 0.1%. Due to space availability constraints the electron energy is restricted by 12 GeV with the state-of-the-art accelerator technology. Any future upgrade will look into advanced accelerator techniques. We have a project at LANL (ending 09/2015) to assess feasibility of a DWA as an afterburner to boost the electron energy by a few GeV.

Operated by Los Alamos National Security, LLC for NNSA Why DWA? Higher accelerating gradients can be withstood. The DWA can be fed by a lower energy higher charge electron beam creating a high transformer ratio wakefield. Small energy spread can be achieved by proper shaping of the accelerated beam.

Operated by Los Alamos National Security, LLC for NNSA Approximate dimensions: High transformer ratio wake: DWA with a double-triangular drive bunch and a trapezoidal witness bunch ΔE/E Exactly the same phenomena, that causes the dominant energy spread effect in beams in conventional linacs can be used to generate extraordinary gradients and small energy spreads in the dielectric structures via wakefield acceleration.

Operated by Los Alamos National Security, LLC for NNSA Our interest in AWA 1.the ability to shape the beam current with a transverse mask and an emittance-exchanger; 2.the wakefield high transformer ratio for a double triangular beam; 3.and that a number of parasitic effects which are hard to account for in numerical simulations, including space charge and synchrotron radiation effects and a beam break-up instability due to dipole wakefield modes, can be reasonably mitigated or tolerated. We want to demonstrate experimentally: