FEL and linac plans at MAX IV laboratory
Francesca CurbisAccelerator Physics, Lund University
MAX IV laboratory
1/31/2013F.Curbis, FEL plans at MAX IV laboratory ------ CLIC workshop, High gradient day
1.5 GeV ring (96 m)
3 GeV Storage ring (528 m)
Short Pulse Facility (SPF)
(Free Electron Laser) ?
Linear accelerator (ca 250 m long)
The MAX IV project
F.Curbis, FEL plans at MAX IV laboratory ------ CLIC workshop, High gradient day
MAX IV accelerators
1/31/2013
SPF hallLinac tunnel
F.Curbis, FEL plans at MAX IV laboratory ------ CLIC workshop, High gradient dayMAX IV site July 2012
Buildings
1/31/20131/31/2013F.Curbis, Linac and FEL plans at MAX IV laboratory ------ CLIC workshop, High gradient dayMAX IV site July 2012
Buildings
1/31/2013F.Curbis, FEL plans at MAX IV laboratory ------ CLIC workshop, High gradient day
Klystron tunnel
BC2 & undulator hall
F.Curbis, FEL plans at MAX IV laboratory ------ CLIC workshop, High gradient day
MAV IV injector
1/31/2013
Photo cathode RF-gun (1.6 cell, Cu, UCLA-Radiabeam/Elettra type) SPFThermionic RF-gun (BaO, MAX-lab type) Ring injection
39 S-band structuresSLEDDouble-coupled (2 pcs/klystron)100 Hz
Double achromat Bunch compressors (”self linearising” with T566+ sextupoles for tuning): positive (fixed) R56, compression varied with RF phase
Linac layout
1/31/2013F.Curbis, Linac and FEL plans at MAX IV laboratory ------ CLIC workshop, High gradient day
L2A L2B L3A L3B
L4A L4B L7A L7B L8A
L8B
L18B BC2
3000 MeV
Extraction1.5 GeV
Extraction3 GeV
Photo cathode RF gun
Kicker & septum
Kicker & septum
SPF
Diagnostics
DiagnosticsL18A
L0 L1A L1B
BC1260 MeV
F.Curbis, FEL plans at MAX IV laboratory ------ CLIC workshop, High gradient day
Two possible operation modes
1/31/2013
high Ipeak -SPF I ~ 18 kA (100 pC)Δt ~ 10 fs FWHM
ɛ ~ 2.5 mm mrad dE/E ~ 0.25 %
FEL kick of, 24th of October 2012, Sara Thorin
low ɛ -FEL
ɛ ~ 0.45 mm mrad (slice)dE/E ~ 0.025 %
Δt ~ 20 fs FWHM
I ~ 3.5 kA
Background/ motivation
• Why a FEL in Lund?– Many years of development in CHG, linac
technology, RF guns, photocathodes & lasers, bunch compressors, MAX IV linac
– Swedish strong user community – Agreement between MAX IV laboratory, Uppsala U,
Stockholm U, SLU, FEL center Stockholm-Uppsala, Lund Laser Center for a X-ray FEL
– Steering committee Swedish scientific case
1/31/2013F.Curbis, FEL plans at MAX IV laboratory ------ CLIC workshop, High gradient day
Two scenarios for a FEL
1/31/2013F.Curbis, FEL plans at MAX IV laboratory ------ CLIC workshop, High gradient day
10 m
28 m
50 m 36 m
FemtoMAX
“Quick” FEL
“Full” FEL
Keep energy 1 nm
SPF beam
Presented by S. Werin at Workshop on the Science and Technology of 4th Generation Light Sources Based on Superconducting Technology, Stockholm , 26-27 November 2012
Increase energy1 Å
Improved beam
The “quick” FEL
1/31/2013F.Curbis, FEL plans at MAX IV laboratory ------ CLIC workshop, High gradient day
10 m
28 m
50 m 36 m
FemtoMAX
“Quick” FELFull FEL
Emittance (norm) 0.5 mm mRad
Peak current 2.5 kA
Pulse length (FWHM) 20 fs
Energy spread 2.5e-4
Energy 3.5 GeV
4.2 KeV (3 Å)1.5 1011 ph/pulse
100 Hz
1D model estimate
Presented by S. Werin at Workshop on the Science and Technology of 4th Generation Light Sources Based on Superconducting Technology, Stockholm , 26-27 November 2012
The “full” FEL
1/31/2013F.Curbis, FEL plans at MAX IV laboratory ------ CLIC workshop, High gradient day
28 m
50 m 36 m
FemtoMAX
+1 GeV
Wavelength 2 ÅFlux >1012 ph/pulsePeak power ~ 100 GWStability by seeding Focus 1 um (beamline)Tapering
Energy 4 GeV (g=7827)Energy spread (sE/E) 2*10-4
Emittance, norm 0.15 mm mRadUndulator period 16 mmUndulator K 1.6Photon wavelength <3 ÅBeta (average) 7 mCurrent, peak 3 kA
0 20 40 60 80 100 120 1400
100200300400500600
Power(GW)
Length (m)
Pow
er (G
W)
seed taperundulators beamline
~80 m ~75 m ~150 m
Presented by S. Werin at Workshop on the Science and Technology of 4th Generation Light Sources Based on Superconducting Technology, Stockholm , 26-27 November 2012
Path to the “full” FEL
• Parameter space under investigation• Start-to-end simulations being initiated– Investigations on the RF gun, bunch compressors,
FEL schemes (self seeding, tapering)
• Linac extension not defined (S-band? X-band?)
1/31/2013F.Curbis, FEL plans at MAX IV laboratory ------ CLIC workshop, High gradient day
1/31/2013F.Curbis, FEL plans at MAX IV laboratory ------ CLIC workshop, High gradient day
Thanks for your attention
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