1. Musings For Future Challenge
Musings
For Future Challenge

2. Which Challenge (s) For A new Source?

3. 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…

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

5. 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

6. Making use of the «Lamp-Genius»

7. 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

8. Operating region
IR-X

9. F. Ciocci (Courtesy)

10. SASE-SECTION

11. 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

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

14. Second oscillator

15. 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)

16. An oscillator at 13.5 nm Dispersion /n W=1.35 mm @ 1° mirror radiator
OK based modulator
W=1.35 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 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

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

18. Saturation Length