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

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