Now, Dino Jaroszynski of Strathclyde University in the UK, together with colleagues at Friedrich-Schiller-Universität in Jena, Germany, and Stellenbosch University in South Africa are the first to have combined a laser-driven plasma wakefield accelerator with an undulator to make a compact source of synchrotron radiation.
The team’s wakefield accelerator can accelerate electrons to 1 GeV, which can create X-ray synchrotron radiation with a very narrow bandwidth. What's more, the wavelength of the radiation can be tuned from the far infrared (terahertz frequencies) to hard X-rays by simply changing the energy of the electron beam.
Such technique, such as plasma wakefield, laser-plasma wakefield, and dielectric wakefield, are show more promises of being a feasible technique for new acceleration scheme. The next few years should be very interesting, especially if the delay in the ILC might cause some people to start thinking of other accelerating structures.