Trace-space reconstruction of low-emittance electron beams through betatron radiation in laser-plasma accelerators

Nuclear Instruments and Methods in Physics Research Section A:

et al. 2018

Self Cite

The plasma-based acceleration is an encouraging technique to overcome the limits of the accelerating gradient in the conventional RF acceleration. A plasma accelerator is able to provide accelerating fields up to hundreds of GeV/m, paving the way to accelerate particles to several MeV over a short distance (below the millimetre range).Here the characteristics of preliminary electron beams obtained with the self-injection mechanism produced with the FLAME high-power laser at the SPARC LAB test facility are shown.In detail, with an energy laser on focus of 1.5 J and a pulse temporal length (FWHM) of 40 f s, we obtained an electron plasma density due to laser ionization of about 6 × 10 18 cm −3 , electron energy up to 350 MeV and beam charge in the range (50 − 100) pC.

“…Electrons produced with the FLAME laser were mainly used to perform diagnostic tests, based on betatron [23,24] and optical transition radiation [25,26,27].…”

Section: Conclusion and Future Developmentsmentioning

confidence: 99%

Characterization of self-injected electron beams from LWFA experiments at SPARC_LAB

Costa

Nuclear Instruments and Methods in Physics Research Section A:

et al. 2018

Self Cite

“…These choices are motivated by the fact EPJ Web of Conferences 167, 01003 (2018) https://doi.org/10.1051/epjconf/201816701003 PPLA 2017 that the main concern here is to study the transverse dynamics of the laser beam under consideration which undergoes relativistic self-focusing. The expression of the laser normalized potential we take into account is: (11) where the pump depletion length is L pd = cτω…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…In the following we develop a calculation referring to an experiment of Laser Wakefield Acceleration (LWFA) performed at the SPARC-LAB test facility through the interaction of the ultrashort ultraintense T i : S a laser FLAME with a He gas-jet target [11,12]. The initial normalized vector potential relative to the experiment was a 0 ∼ 4, corresponding to a laser pulse of energy 1J, duration τ = 30 f s and focal spot radius 6 ± 1 µm, equivalent to σ 0 = 8.5 µm in Eq.…”

Section: Comparison With Current Experimentsmentioning

confidence: 99%

Ray optics hamiltonian approach to relativistic self focusing of ultraintense lasers in underdense plasmas

Curcio

et al. 2018

EPJ Web of Conferences

“…Indeed, the possibility to reach power densities larger than 10 19 W/cm 2 at the femtosecond level has been exploited in many fields of research: astrophysics in the laboratory [1], high energy density experiments [2], electromagnetic wave sources [3][4][5] and novel schemes for particle acceleration [6]. The dream of a table-top accelerator, both for e − and p + , has attracted many people working in the plasma field, but, even though compact accelerating systems have been already demonstrated [7][8][9][10], the produced charged particle beams are still affected by shot-by-shot instabilities.…”

Section: Introductionmentioning

confidence: 99%

Novel Single-Shot Diagnostics for Electrons from Laser-Plasma Interaction at SPARC_LAB

Botton

et al. 2017

QuBS

Nowadays, plasma wakefield acceleration is the most promising acceleration technique for compact and cheap accelerators, needed in several fields, e.g., novel compact light sources for industrial and medical applications. Indeed, the high electric field available in plasma structures (>100 GV/m) allows for accelerating electrons at the GeV energy scale in a few centimeters. Nevertheless, this approach still suffers from shot-to-shot instabilities, mostly related to experimental parameter fluctuations, e.g., laser intensity and plasma density. Therefore, single shot diagnostics are crucial in order to properly understand the acceleration mechanism. In this regard, at the SPARC_LAB Test Facility, we have developed two diagnostic tools to investigate properties of electrons coming from high intensity laser-matter interaction: one relying on Electro Optical Sampling (EOS) for the measurement of the temporal profile of the electric field carried by fast electrons generated by a high intensity laser hitting a solid target, the other one based on Optical Transition Radiation (OTR) for single shot measurements of the transverse emittance. In this work, the basic principles of both diagnostics will be presented as well as the experimental results achieved by means of the SPARC high brightness photo-injector and the high power laser FLAME.