In my research, I use intense laser-plasma interactions to create new kinds of compact particle accelerators and X-ray light sources, and I exploit the unique properties of these sources to explore the physics of extreme conditions.
Particle accelerators are well known as important tools of scientific discovery, but they are large and expensive machines. The laser wakefield acceleration technique I research now allows high-energy particle and X-ray beams to be produced in a university size laboratory. Using these accelerators we can now produce multi-GeV electron beams in a plasma accelerator just a few centimetres long (something which a conventional accelerator can only achieve in one hundred metres or more).
The unique properties of the beams that laser wakefield accelerators produce, together with their co-location and easy synchronization with other high-power laser sources, are now helping to drive a new generation of experiments. These experiments aim to understand how matter behaves under extreme conditions – extremely high temperatures, densities and electromagnetic field intensities compared to anything found on Earth, but conditions that are surprisingly common and important throughout the universe.
et al., Excitation and Control of Plasma Wakefields by Multiple Laser Pulses, Physical Review Letters, ISSN:1079-7114
et al., Highly efficient angularly resolving x-ray spectrometer optimized for absorption measurements with collimated sources, Review of Scientific Instruments, ISSN:1089-7623
et al., 2017, Spectral and spatial characterisation of laser-driven positron beams, Plasma Physics and Controlled Fusion, Vol:59, ISSN:0741-3335
et al., 2016, Ionization injection effects in x-ray spectra generated by betatron oscillations in a laser wakefield accelerator, Plasma Physics and Controlled Fusion, Vol:58, ISSN:0741-3335
et al., 2016, Tomography of human trabecular bone with a laser-wakefield driven x-ray source, Plasma Physics and Controlled Fusion, Vol:58, ISSN:0741-3335