French-Ukrainian workshop Kevin Dupraz 1 ELI-NP-GBS. Extreme Light Infrastructure Nuclear Physics Gamma Beam Source
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1 1 ELI-NP-GBS Extreme Light Infrastructure Nuclear Physics Gamma Beam Source
2 The 3 ELI s pillars 2 ELI-Beamlines In Czech Republic: Ultra-short and intense beams for interdisciplinary applications. ELI-NP In Romania: Photonuclear physics from intense gamma-source and high-power laser beams. ELI-Attosecond In Hungary: physics of ultra-short laser pulses in attosecond order.
3 ELI-NP 3 2 Lasers 10PW Gamma Source
4 E γ (kev) Production of the gamma-beam 4 Compton Scattering Gamma-ray production + Collimation Energies selection Laser E L gamma : E γ = f(θ) Electron ϕ q E e (scattered electron) E e = 50 MeV θ (mrad)
5 Accelerator configuration 5 Gamma-beam specifications: Energies γ (E γ ) : MeV Bandwidth (ΔE/E) : <0.5% Spectral density (flux) : >5000 γ/(s.ev) Linear polarization: >95% LINAC multi-bunch at 100Hz (space, cost and tunability) + Laser Beam optical Circulator (efficiency, robust )
6 Overview design 6 E e 280 MeV E e 600 MeV 2 interaction points : 1 lasers 200mJ Yb@515nm (3.5ps) per interaction point (combined for the second: 400mJ) Hybrid LINAC bands S and C (~ MeV)
7 Optical system: laser beam circulator 7 2 high-grade quality parabolic mirrors Aberration free Mirror-pair system (MPS) per pass Circulator principle Synchronization Optical plan switching Constant incident angle = small bandwidth Angle of incidence (Φ) Laser power = state of the art Waist size (ω 0 ) Free parameters = to be optimized on the gamma-ray flux Number of passes 32 passes, φ = cm
8 Circulator constraints 8 Mirror surface quality (Code V) Frozen geometry (parabolic mirrors distance) => Tight alignment (few μm, μrad) with 7 degrees of freedom (see later) MPS parallelism (< 3 μrad) Synchronization (few 100fs)
9 Optical Quality (in progress) 9 Surface deformations IP beam profile Simulated with proven method (same as Virgo) Parabolic mirrors deformations < λ/80 RMS MPS mirrors Difficult to relate surface quality to gamma-ray flux Good Bad System with nonlinear behavior => everything have to be simulated Good Bad
10 Relative flux Alignement 10 Alignment = overlap of 32 passes Degrees of freedom Injection Tilts (M0) Tilts + translations (M2) N degrees of freedom = 7 Tolerances (μrad, μm) Dedicated alignment algorithm necessary
11 Expected performances 11 Relative flux Relative flux (>95%) Simulation of the alignment algorithm => Flux maximization Circulator gain VS simple pass (loss from mirror surface not taken into account) 30
12 Synchronization tool 12
13 Synchronization (Proof of principle) 13 Synchronization repeatability = 100fs
14 Relative flux Synchronization online 14 Diamond detector Located in the gamma beam line before collimation => Synergy with superkekb Diamond detector 5x5mm 2 + Preshower + DAQ Δt (fs) Cheikh Ndiaye
15 Outlook 15 New optical system under development: LAL: design and tool development ALSYOM: opto-mechanics AMPLITUDE: lasers Laser Beam Circulator is not as easy as it was thought (challenging optics) Required performances reachable Flux > 5000γ/(s.eV) Degree of polarization > 99% Bandwidth < 0.5% Prototype delivery date: June 2015
16 16 Thank you for your attention
17 Polarisation 17 Interaction Point polarisation orientation Simulation with multilayer coatings and coating birefringence Polarization preserved during circulation (>99%) Linear Circular
18 Flux γ/(s.ev) Optimization No. passes 18 Flux
19 Flux relatif MPS parallelism 19
20 Average distance to barycenter (µm) Alignment 20 Pre-aligned at 20 μrad,μm aligned Alignment algorithm Relative flux
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