Specifications

Insertion Device

Undulators: ID1 and ID2
Type	APPLE-II permanent magnets
Period [mm]	100
Number of periods	20
Polarisation	linear horizontal, linear vertical, elliptical
Minumim gap [mm]	14
Fundamental wavelength [nm] *
at E = 0.9 GeV	1026
at E = 1.5 GeV	405
at E = 2.0 GeV	212
Dispersive section
Type	Electromagnetic, 3 poles magnet
Length [cm]	50
Max field [T]	0.8
Power supply current [A]	3 ÷ 300

*Maximum wavelength for gap = 14 mm, phase = 0, for typical electron energies E

Elettra parameters during SR-FEL operations

Beam energy [GeV]	0.75 - 1.8
Normalized emittance*
► x direction [mm mrad]	3.2
► y direction [mm mrad]	0.2
Number of bunches	1 - 4
Max current per bunch [mA]	6
Energy spread**	0.12% ÷ 0.20%
Bunch length [ps]**	25 ÷ 30
Peak current [A]**	~ 80
Beam dimensions***
► σx [mm]	0.11
► σy [mm]	0.026

*at 1.0 GeV electron energy;
**at 0.9 GeV electron energy, 6 mA stored current;
***at 0.9 GeV electron energy.

Seed laser system

Laser systems
SAM mode-locked fiber laser oscillator	FemtoFiber pro IR, Toptica Photonics
Ti:Sa regenerative amplifier	Legend HE, Coherent Inc.
Amplifier parameters
Repetition Rate [Hz]	1 ÷ 1000
Fundamental emission wavelength [nm]	780
Energy per pulse [mJ]	2.5
Pulse duration [fs, FWHM]	100
Harmonics used for seeding*	2nd, 3rd

*Harmonic generation stages are performed in BBO crystals