EUPRAXIA-PISA JUNE 2016 e-Beam-Laser M. Artioli, G. Dattoli, F. Nguyen and S. Pagnutti

We are trying to go Towards «Bonsai» FEL

Whatever we do…oscillators, SASE…

Get a fast and reliable description embedding the beam with the «laser environment»

Fel benchmarking-codes Genesis, Prometeo, Medusa, Perseo

What are the elements characterizing a FEL A) Gain B) Saturation intensity C) output radiation

GAIN Def.

… gain

Energy Spread, emittance … Gain reduction effects

FEL-oscillator dynamics We can adjust power in this way electrons photons short undulator Gain and output power dependance!

Round Trip evolution The FEL Intracavity evolution can be characterized using formulae closely symilar to those of conventional laser devices

SASE-PIVOTAL –PARAMETERS Pierce parameter and Gain length

SASE & HARMONIC GENERATION

Segmented undulators

Exotic undulators, Biorthogonal, Tapered…

FEL-short pulses Gain and output power dependance! short undulator electrons photons short undulator Gain and output power dependance!

Very Short pulses,Single spike, slippage dominance P SP = 1.−𝑒𝑥𝑝 −1.7 𝜋 𝜇 𝑐 𝑃 𝐹   𝑁 𝑢 =400, 𝜆 𝑢 =2.8 𝑐𝑚, 𝐾=2.14, 𝐸=123.9 𝑀𝑒𝑣, 𝐼 𝑒 =265.6 𝐴, 𝜎 𝜖 =1.3∙ 10 −3 , 𝜀=0.4 𝑚𝑚∙𝑚𝑟𝑎𝑑, 𝛽=2.0 𝜎 𝑏 =4.5 𝜇𝑚 𝜌 𝑑 =6.2 (−3) 𝜆 𝑠 =783.74 𝜇 𝑚

Summary of what has been done WP6 A) Set up of the PARSIFEL code B) Study of FEL single spike operation (Numerical) C) Case study Parsifel & beam accelerated parameters D) Beam transport and large emittance spread E) Transverse Gradient Undulators F) Hiring with EUPRAXIA funds

Beam Transport Large energy spread

WP6 slide: from F.Nguyen & G. Dattoli In advanced phase Simulation & Modeling Tools benchmarking: comparison among different semi-analytical and full numerical FEL codes (see also the presentation from G.Dattoli & M.Artioli) FEL power growth comparison between two cases (blue, such as SPARC, red, with LWFA) WP6 present core task Report on the state-of-the-art short period undulators and case studies on undulators based on novel technologies: simulation and design Assi sul grafico?!?!?!? Synergies with WP5 Joint study of the beam parameters, extraction and manipulation  their impact on the FEL power growth

TGU Field distribution

Single spike operation and scaling relations