Two color FEL experiment

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Presentation transcript:

Two color FEL experiment F. Villa on behalf of Sparc_lab

Outline Scientific case Linac operation FEL results Conclusions F. Villa

Scientific motivation Two color FELs are greatly discussed in literature for several applications (i.e. pump-probe) They are limited by the natural bandwidth of the FEL amplifier Two-bunches electron beam with given time and energy separation Tailoring the time and frequency separation of the FEL pulses Linac settings: laser comb technique in the velocity bunching Explore FEL dynamics Sub-ps FEL pulse at two different frequencies Two color FEL radiation at two different times One color FEL radiation at two different times F. Villa

Electron comb generation seed CPA 0.09 ps rms 3rd HG ~50 uJ 266 nm 4.27 ps αBBO crystal e-tot ~160 pC F. Villa

Measure Linac working points Simulation

FEL diagnostics Resolution 1.2 nm Spectral window: 200-840 nm Chamber VI Filter Wheel Chamber Filters Resolution 1.2 nm Spectral window: 200-840 nm Undulator VI Fiber IR spectrometer Movable Mirror Joulemeter Energy range 1pJ – 1 nJ Grenouille Time-bandwidth product <10 Spectral resolution 0.7 nm Time window 1 ps F. Villa

FEL spectra -85.6 Quasi single spike regime -88.6 -87.6

FEL time modulations spectrum time (autocorr.) 110 fs FEL radiation Energy (MeV) E. spread (%) Length (fs) Charge (pC) 1st bunch 92.52 (.03) 0.174 (.005) 147 (2) 82.2 (1.6) 2nd bunch 93.59 (.03) 0.317 (.005) 283 (3) 77.9 (1.6) Whole beam 93.04 (.03) 0.631 (.003) 305 (4) 160 (3) spectrum time (autocorr.) 110 fs FEL radiation Electron Δλ (nm) Time duration rms (fs) Time separation (fs) 18 (4) 77 (5) 110 (26) Energy separation (MeV) 1.07 (0.05) Time separation (ps) 0.42 (0.03)

FEL tunability ΔE (MeV) 1.01 (0.03) Δλ (nm) 20.7 (1.7) ΔEth (MeV) 1.07 (0.09) ΔE (MeV) 1.14 (0.06) Δλ (nm) 26 (3) ΔEth (MeV) 1.35 (0.14) F. Villa

SASE spectrum instability -88.6 F. Villa

Conclusions Two pulse electron beam FEL light Next developments: tunable in time and energy separation capable of FEL emission Shorter or equal to the FEL coherence length (quasi-single spike regime) FEL light characterization of FEL radiation spectrum production of train of short FEL pulses Next developments: FEL Seeding for better spectrum stability New laser technique for laser comb generation F. Villa