Laser wakefield accelerators can be an alternative to huge linear accelerators and cyclotrons. Electron bunches with 150-200 MeV energies are needed for Very High Energy Electron radiotherapy. Injection of electrons and their acceleration take place when the focused laser beam interacts with a gas plasma target. We utilise a combined laser micromachining technology with short-pulse and ultra-short-pulse lasers to manufacture complex gas nozzles in fused silica. TW-class lasers are able to accelerate electrons to high energies in a very short distance. A stable operation with electron energy around 3 MeV was demonstrated at a 1 kHz repetition rate. Flexibility in 3D carving within fused silica with lasers allows tailoring plasma targets to particular beams of ultra-high intensity lasers and achieving high energy of accelerated electrons with low energy spread and divergence. Electron energy above 100 MeV could be achieved using new kHz-class OPCPA lasers operating at pulse energy >50 mJ.
Optical-fiber based pulsed source of correlated photons is proposed and investigated experimentally. Characteristics and operation of the source is discussed. Single photon generation rate up to 460 000 photons/s at ~925 nm wavelength is demonstrated experimentally.
We present a new interferometric technique for gas jets density characterization employing a Wollaston shearing interferometer. The distinctive feature of this setup is the double pass of the probe beam through the gas target facilitated by a relay-imaging object arm that images the object on itself and preserves the spatial information. The double pass results in two-fold increase of sensitivity at the same time as the relay-imaging enables the characterization of gas jets with arbitrary gas density distribution by tomographic reconstruction. The capabilities of the double-pass Wollaston interferometer are demonstrated by tomographic density reconstruction of rotationally non-symmetric gas jets that are used as gas targets for the betatron X-ray source at ELI-Beamlines.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.