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SEEDING EXPERIMENTS AT SPARC

SEEDING EXPERIMENTS AT SPARC. Luca Giannessi ENEA C.R. Frascati On behalf of the SPARC collaboration. I nternational Conference on Charged and Neutral Particles Channeling Phenomena, 4-8 October 2010, Ferrara, Italy. Contributors.

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SEEDING EXPERIMENTS AT SPARC

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  1. SEEDING EXPERIMENTS AT SPARC Luca Giannessi ENEAC.R. Frascati On behalf of the SPARC collaboration International Conference on Charged and Neutral Particles Channeling Phenomena, 4-8 October 2010, Ferrara, Italy

  2. Contributors L.G., A. Petralia, G. Dattoli, F. Ciocci, M. Del Franco, M. Quattromini, C. Ronsivalle, E. Sabia, I. Spassovsky, V. Surrenti ENEA C.R. Frascati, IT. D. Filippetto, G. Di Pirro, G. Gatti, M. Bellaveglia, R. Boni, D. Alesini, M. Castellano, E. Chiadroni, L. Cultrera, M. Ferrario, L. Ficcadenti, A. Gallo, A, Ghigo, E. Pace, B. Spataro, C. Vaccarezza, INFN-LNF, IT. A. Bacci, V. Petrillo, A.R. Rossi, L. Serafini INFN-MI, IT. M. Serluca, M. Moreno INFN-Roma I, IT. L. Poletto, F. Frassetto CNR-IFN, IT. J.V. Rau, V. Rossi Albertini ISM-CNR, IT. A. Cianchi, UN-Roma II TV, IT. A. Mostacci, M Migliorati, L. Palumbo, Un. Roma La Sapienza, IT. G. Marcus, P. Musumeci, J. Rosenzweig, UCLA, CA, USA. S. Spampinati, ST, IT and University of Nova Gorica, Nova Gorica, M. Labat, F. Briquez, M. E. Couprie, SOLEIL, FR. B. Carré, M. Bougeard, D. Garzella CEA Saclay, DSM/DRECAM, FR. G. Lambert LOA, FR. C.Vicario PSI, CH. L. Giannessi, Channeling 2010

  3. Ti:Sa Regenerative Amplifier HHG generation Chamber In vacuum spectrometer 550-40nm Periscope & injection chicane + MUR Seeded SPARC Layout L. Giannessi, Channeling 2010

  4. GAS Cell Focusing mirrors Infrared Infrared to Undulators Dec. 2007 Differential vacuum L. Giannessi, Channeling 2010

  5. Seeded Operation FEL Amplifier FEL Amplifier FEL Amplifier Seed Seed Seed    FEL Harmonic Generation Seed 1 2= 1/n, n=2 Modulator Radiator • Seed Sources: • 400 nm in BBO crystal (high seed energy) • 266 nm & 160 nm generated in gas • Cascaded FEL tested with both seed configurations L. Giannessi, Channeling 2010

  6. FEL Amplifier Seed  Seed @ 266 nm generated in Ar, ~50 nJ (±20nJ)6 UM 266 nmSpectrometer slit @ 5 um - CCD saturated with nb filter @ 266nm, 17% T Amplification ≈ 20x L. Giannessi, Channeling 2010

  7. Delay line Adjustable delay up to 4m Delay line Scan

  8. FEL Harmonic Generation Seed 1 2= 1/n, n=2 Modulator Radiator Cascaded FEL • Seed @ 266 nm, 50 nJ 5-4-3 UM tuned @ 266 nm – 1-2-3 UM tuned @133 nm L. Giannessi, Channeling 2010

  9. FEL Harmonic Generation FEL Harmonic Generation Seed Seed 1 1 2= 1/n, n=2 2= 1/n, n=2 Modulator Modulator Radiator Radiator L. Giannessi, Channeling 2010

  10. (2010/06/04) Seed @ 160nm • Seed intensity & SASE too low to be detected at the spectrometer (< 1 nJ) Seeded FEL – 4 nJ The seed @ 266 measured 1 day before shows the same double peak structure L. Giannessi, Channeling 2010

  11. Effect of high intensity seed Seed Energy < 0.5 uJ ~ 0.7 uJ ~ 3 uJ GENESIS Simulation ~ 9 uJ L. Giannessi, Channeling 2010

  12. Seeded FEL: field intensity above saturation Simulation with Perseo(www.perseo.enea.it) L. Giannessi, Channeling 2010

  13. Bunching coefficients in the front side of the pulse Expected very efficient generation of high order harmonics L. Giannessi, Channeling 2010

  14. Harmonic pulse Harmonic emission suppressed by energy spread Harmonics in a Superradiant pulse • Short bunching peaks on the pulse front side at the higher order harmonics • Dynamics for non-linear harmonic evolution “faster” by the harmonic factor n. (i.e. Lg,n ~ Lg /n ) • Short bursts of harmonic radiation • Pulse structre preserved by the “solitary wave” behavior of this solution L. Giannessi, Channeling 2010

  15. High harmonics down to 37 nm 11h 10h 9h 8h 7h 6h 5h 4h 3h 2h 1h Observation of 11° harmonic at 37nm Measured energy per pulse, spot size & and bandwidth of the first 11° harmonics L. Giannessi, Channeling 2010

  16. High intensity seed in a cascaded configuration Effect of high intensity seed Seed 1= 400nm 2= 200 nm Modulator Radiator 3° harmonic of the radiator (66nm ~ 100 nJ) SPECTRUM @ 200 nm Energy jitter mainly due to e-beam energy jitter L. Giannessi, Channeling 2010

  17. Correlations Large energy jitter –> large energy fluctuations Indication of saturation @200 nm Correlation Energy – Spot size Correlation Energy – Linewidth Structure in the spectrum Redshift L. Giannessi, Channeling 2010

  18. 3h of the radiator 66 nm L. Giannessi, Channeling 2010

  19. 37 nm Conclusions (From Channeling 2006) ok • SPARC represents a unique opportunity for studying single pass FEL and FEL cascades in seeded mode • Conventional lasers and FEL are merged in a single device • New experiments are foreseen in the next future • The harmonic cascade • Multistage cascade and the Fresh Bunch injection technique • Superradance in a cascade and the harmonic cascade • FEL amplification from a gas HHG source/harmonic generation • These new schemes extend the foreseen SPARC spectral range to 44nm - 500 nm The experience resulting from those experiments will provide the confidence to extend the seeded FEL cascade wavelength operation range in higher beam energy devices as SPARX ok In progress true

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