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The main aim of this experiment is to demonstrate that a high brightness electron beam can be accelerated by a plasma wave without any significant degradation of its quality. Motivations of the technical choices are made and expected performances are reported.

Generation of high brightness electron beams from plasma-based accelerators – STATUS

The bzndo of the electron bunch field is electro-optically encoded into a Ti: Sa laser, having fs rms pulse length, directly derived from the photocathode’s laser.

The bunch profile information is spatially retrieved, i.

In particular, we used the EOS for a single-shot direct visualization bano the time profile of a comb-like electron beam, consisting of two bunches, about fs rms long, sub-picosecond spaced with a total charge of pC. The ratio of the maximum accelerating field behind the driving beam bunch and the maximum decelerating field inside the driving beam bunch is defined as Transformer Ratio, a key parameter that determines the energy gain in particle acceleration.


We investigate the transformer ratio for different shapes of a single driving bunch. A complete map of the transformer ratio is obtained by varying: It is found bahdo the transformer ratio critically depends on the bunch shape and on the density ratio.


Moreover both in the linear as well as in the non-linear regime the theoretical limit of 2 for the transformer ratio of a single symmetric bunch can be exceeded using asymmetric bunches in the linear regime as well as symmetric bunches in nonlinear regime. Plasma wakefield acceleration is the most promising acceleration technique known nowadays, able to provide very high accelerating fields 10— GV m -1enabling acceleration of electrons to GeV energy in few centimetres.

However, the quality of the electron bunches accelerated with this technique is still not comparable with that of conventional accelerators; radiofrequency-based accelerators, in fact, are limited in the accelerating field 10— MV m -1 requiring therefore kilometric distances to reach the GeV energies, but can provide very bright electron bunches.


Combining high brightness electron bunches from 203 accelerators and high accelerating fields reachable with plasmas could be a good compromise allowing to further accelerate high brightness electron bunches coming from LINAC while preserving electron beam quality.

Following the idea of plasma wave resonant excitation driven by a train of short bunches, we have started to study the requirements in terms of plasma for SPARC-LAB.

In particular, here we focus fib the ionization process; we show a simplified model to study the evolution of plasma induced by discharge, very useful to design the discharge circuit able to fully ionize the gas and bring the plasma at the needed temperature and density. The laser pulse, 25 f s long, focused down to 65 microns into the capillary is injected ahead of the dirb, drives a weakly non-linear plasma wave with wavelength of about microns.


A proper phasing of the two pulses allows acceleration of electrons from the injection energy of MeV up to about MeV for a 8 cm long capillary.

Installation of the beam lines is foreseen by the end figb and first tests starting in mid Comb beams are sub-picosecond, high-brightness electron bunch trains generated via the velocity bunching technique. Such bunch trains can be used to drive tunable and narrow band THz sources, FELs and plasma wake field accelerators.

The goal of the external injection experiment at SPARC-LAB is to demonstrate the possibility to accelerate a high furb electron beam, produced by a conventional accelerator, by exploiting the wakefields generated in an underdense plasma by a high power laser pulse, without degradating too much its emittance and energy spread.

Plasma wave resonant excitation driven by a train of short bunches: We discuss here the production of trains of two-color FEL radiation pulses driven by a comb-like electron beam. A train of two short fs electron bunches, almost overlapped in time, with a two-level energy distribution, has fidb injected in the SPARC undulator, resulting into FEL pulses at two characteristic frequencies with multi-peaked time structure.

Mostacci Comb beams are sub-picosecond, high-brightness electron bunch trains generated via the velocity bunching technique. Enrica Chiadroni We discuss here the production of trains of two-color FEL radiation pulses driven by a comb-like electron beam.