1. FEL and linac plans at MAX IV laboratory
Francesca Curbis
Accelerator Physics, Lund University
MAX IV laboratory

2. Short Pulse Facility (SPF) Linear accelerator (ca 250 m long)
The MAX IV project
Short Pulse Facility (SPF)
(Free Electron Laser) ?
1.5 GeV ring (96 m)
Linear accelerator (ca 250 m long)
3 GeV Storage ring (528 m)
F.Curbis, FEL plans at MAX IV laboratory CLIC workshop, High gradient day
1/31/2013

3. MAX IV accelerators Linac tunnel SPF hall
F.Curbis, FEL plans at MAX IV laboratory CLIC workshop, High gradient day
1/31/2013

4. Buildings Buildings BC2 & undulator hall Klystron tunnel
MAX IV site July 2012
MAX IV site July 2012
F.Curbis, FEL plans at MAX IV laboratory CLIC workshop, High gradient day
F.Curbis, Linac and FEL plans at MAX IV laboratory CLIC workshop, High gradient day
F.Curbis, FEL plans at MAX IV laboratory CLIC workshop, High gradient day
1/31/2013
1/31/2013
1/31/2013

5. MAV IV injector
Photo cathode RF-gun (1.6 cell, Cu, UCLA-Radiabeam/Elettra type)  SPF
Thermionic RF-gun (BaO, MAX-lab type)  Ring injection
39 S-band structures
SLED
Double-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
F.Curbis, FEL plans at MAX IV laboratory CLIC workshop, High gradient day
1/31/2013

6. Linac layout
L2A
L2B
L3A
L3B L0
L1A
L1B
Diagnostics
BC1 260 MeV
Photo cathode RF gun
Extraction 1.5 GeV
L4A
L4B
L7A
L7B
L8A
Kicker & septum
L8B
Extraction 3 GeV
SPF
L18A
L18B
BC2
3000 MeV
Diagnostics
Kicker & septum
F.Curbis, Linac and FEL plans at MAX IV laboratory CLIC workshop, High gradient day
1/31/2013

7. Two possible operation modes
I ~ 3.5 kA
high Ipeak -SPF
low ɛ -FEL
I ~ 18 kA (100 pC)
Δt ~ 20 fs FWHM
Δt ~ 10 fs FWHM
ɛ ~ 0.45 mm mrad (slice)
ɛ ~ 2.5 mm mrad
dE/E ~ 0.25 %
dE/E ~ %
FEL kick of, 24th of October 2012, Sara Thorin
F.Curbis, FEL plans at MAX IV laboratory CLIC workshop, High gradient day
1/31/2013

8. 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
F.Curbis, FEL plans at MAX IV laboratory CLIC workshop, High gradient day
1/31/2013

9. Two scenarios for a FEL Keep energy 1 nm SPF beam Increase energy 1 Å
Improved beam
10 m
28 m
FemtoMAX
“Quick” FEL
50 m
36 m
“Full” FEL
Presented by S. Werin at Workshop on the Science and Technology of 4th Generation Light Sources Based on Superconducting Technology, Stockholm , November 2012
F.Curbis, FEL plans at MAX IV laboratory CLIC workshop, High gradient day
1/31/2013

10. The “quick” FEL 1D model estimate Full FEL 4.2 KeV (3 Å)
FemtoMAX
“Quick” FEL
50 m
36 m
Full FEL
1D model estimate
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)
ph/pulse
100 Hz
Presented by S. Werin at Workshop on the Science and Technology of 4th Generation Light Sources Based on Superconducting Technology, Stockholm , November 2012
F.Curbis, FEL plans at MAX IV laboratory CLIC workshop, High gradient day
1/31/2013

11. The “full” FEL Wavelength 2 Å Flux >1012 ph/pulse
Presented by S. Werin at Workshop on the Science and Technology of 4th Generation Light Sources Based on Superconducting Technology, Stockholm , November 2012
28 m
FemtoMAX
50 m
36 m
undulators
seed
taper
beamline
+1 GeV
~80 m
~75 m
~150 m
Energy
4 GeV (g=7827)
Energy spread (sE/E)
2*10-4
Emittance, norm
0.15 mm mRad
Undulator period
16 mm
Undulator K
1.6
Photon wavelength
<3 Å
Beta (average)
7 m
Current, peak
3 kA
Wavelength 2 Å
Flux >1012 ph/pulse
Peak power ~ 100 GW
Stability by seeding
Focus 1 um (beamline)
Tapering
F.Curbis, FEL plans at MAX IV laboratory CLIC workshop, High gradient day
1/31/2013

12. 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?)
F.Curbis, FEL plans at MAX IV laboratory CLIC workshop, High gradient day
1/31/2013

13. Thanks for your attention
F.Curbis, FEL plans at MAX IV laboratory CLIC workshop, High gradient day
1/31/2013