Musings For Future Challenge FEL@IRIDE Musings For Future Challenge

Which Challenge (s) For A new Source?

With the capabilities of a FEL Flexible in wave length: IR-X or even Gamma Flexible in time duration Microseconds to Attoseconds Large rep. Rate…

And capable of providing informations on… Primakoff, U-boson production, Non linear QED…

Flexible-FEL (?) The Flexibility of FEL is a consequence of the capabilities of the e-beam source But also of its Conception in terms of the capabilities of new schemes for FEL operation (SPARC has provided an important test facility to try new schemes, in particular the seeding succesfully exported elsewhere) A suitable «Architecture» merged in an innovative conception

Making use of the «Lamp-Genius»

Integrated «architecture» S-C-LINAC structures with 3-4 GeV maximum energy   Between the two Linacs a double FEL oscillator, with a manifold role, is inserted The undulator chain can be powered by the beam operating at full energy (3-4 GeV) or less A second FEL oscillator is added for the operation in the UV region and for intra-cavity backscattering for the realization of a gamma source to be exploited for Nuclear Physics studies and the production of polarized electrons The third FEL section may operate in SASE or SEDEED mode The seeding will be achieved by exploiting a conventional seeding procedure or by using the self- seeding scheme based on a kind of oscillator-amplifier device, according to the scheme first developed in Barbini et al. “In prospects for 1 Angstrom FEL” Sag Harbor 1990

Operating region IR-X

F. Ciocci (Courtesy)

SASE-SECTION

SASE-1. 5 GeV M. Artioli, F. Ciocci, E. Di Palma, A. Doria, G. P SASE-1.5 GeV M. Artioli, F. Ciocci, E. Di Palma, A. Doria, G. P. Gallerano, E. Giovenale, L. Giannessi, P. L. Ottaviani, S. Pagnutti, A. Petralia, V. Petrillo, J.V. Rau, E. Sabia, I. Spassovsky, V. Surrenti and A. Torre

First Oscillator: Pumb & probe, bio-medical applications, X-ray Generation, Beam Heater, Two colors, Low Energy Gamma-Gamma collider

Second oscillator

FEL FOR SEEDING/PREBUNCHING linear/helical undulator with U = 4.4 cm and KU = 4.463 and two options for the Linac-delivered e-beam energy: i) Ee = 750 MeV (e = 1468) ii) Ee = 2.28GeV (e = 4462) 1120nm (3  40nm , 5  24nm) 1  13nm (3  4.4nm , 5  2.6nm)

An oscillator at 13.5 nm Dispersion /n W=1.35 mm @ 1° mirror radiator OK based modulator W=1.35 mm @ 1° mirror OK ensures control of modulation rate* Mo-Si mirrors up to 70% reflectivity (not a critical parameter) Helical OK configuration (low on axis harmonic power) Intracavity harmonic generation (as in VERDI Coherent laser) Example: Cavity length of 41.82 m for a bunch separation of 3 x 93 ns Beam size at Mirrors 1 & 1.3 mm radiator R1=18m R2=24m * G. Dattoli, L. Giannessi, P.L. Ottaviani, NIM A507 (2003) 26-30

Costs Quite a Simple rule The costs are associated with the undulators «dressed» undulator 0.2 M-euro/m

Saturation Length