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- University of LisbonPT1.3k papers
- Universidade Técnica de LisboaPT388 papers
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- European Organization for Nuclear ResearchCH202 papers
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7 papers · 2 filters
Effect of the frequency chirp on laser wakefield acceleration
V. B. Pathak, J. Vieira, R. A. Fonseca +1
The role of laser frequency chirps in the laser wakefield accelerator is examined. We show that in the linear regime, the evolution of the laser pulse length is affected by the fre…
Scaling of spontaneous rotation with temperature and plasma current in tokamaks
F. I. Parra, M. F. F. Nave, A. A. Schekochihin +6
Using theoretical arguments, a simple scaling law for the size of the intrinsic rotation observed in tokamaks in the absence of momentum injection is found: the velocity generated…
Gyrokinetic simulations of the tearing instability
R. Numata, W. Dorland, G. G. Howes +3
Linear gyrokinetic simulations covering the collisional -- collisionless transitional regime of the tearing instability are performed. It is shown that the growth rate scaling with…
Magnetic control of particle-injection in plasma based accelerators
J. Vieira, S. F. Martins, V. B. Pathak +3
The use of an external transverse magnetic field to trigger and to control electron self-injection in laser- and particle-beam driven wakefield accelerators is examined analyticall…
Non-invasive characterization of transverse beam emittance of electrons from a laser-plasma wakefield accelerator in the bubble regime using betatron x-ray radiation
S. Kneip, C. McGuffey, J. L. Martins +17
We propose and use a technique to measure the transverse emittance of a laser-wakefield accelerated beam of relativistic electrons. The technique is based on the simultaneous measu…
On the influence that the ground electrode diameter has in the propulsion efficiency of an asymmetric capacitor in nitrogen gas
Alexandre A. Martins, Mario J. Pinheiro
In this work the propulsion force developed in an asymmetric capacitor will be calculated for three different diameters of the ground electrode. The used ion source is a small diam…