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Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22. June 2014

Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

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Page 1: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

Lecture 6. New FEL Schemes and Challenges

X-Ray Free Electron Lasers

Igor Zagorodnov

Deutsches Elektronen Synchrotron

TU Darmstadt, Fachbereich 1822. June 2014

Page 2: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 2

Contents

Motivation Self-seeding scheme Nonlinear harmonic generation High-gain harmonic generation (HGHG) Echo-enabled harmonic generation (EEHG) Harmonic lasing Purified SASE scheme (pSASE) Energy spread cooling scheme Table-top FEL Outlook

Page 3: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 3

electrons

radiation

Motivation

Longitudinal profile with large statical fluctuations

Transverse profile is coherent

Coherence

Page 4: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 4

Motivation

Coherence

Cooperation length: lc ~ /4πρ (slippage length within one gain length)

FEL spectrum

c/2πlc

c/lb

FEL power

2πlc

lb

seed

Page 5: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 5

Self-seeding scheme

J. Feldhaus et al, Opt.Comm. 140, p.341 (1997)

G.Geloni et al, DESY 10-033 (2010)

SASE in the first undulator monochromator filters the

radiation „seeded“ amplification in the

second undulator

Grating monochromator

Gas cell monochromator

SASE

SASE-FEL

electronen

radiation

amplifiermonochromator

0

( )S

Page 6: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 6

Non-linear harmonic generation

Higher harmonics in undulator (spontaneous radiation)

Spectral density in forward direction.The absolute bandwidth is the same

Page 7: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 7

Non-linear harmonic generation

0[ ]cos

2

cK JJ EdW e

dt

2

8( ) sin(2 )w

uz uk

z t v t t zz v t

0 cos2

cKEdW e

dt

2 2

0 12 2[ ]

4 2 4 2

K KJJ J J

K K

Higher harmonics in FEL radiation

01

[ ]( )

4xr

cK JJdE z j

dz

0

1( )4xr

cKdE z j

dz

Coupling factor in Lecture 3?

Page 8: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 8

Non-linear harmonic generationA steady energy transfer?

0

0

( )0

cos( ) cos( )

cos( ) cos( )2

2u z u z

x x u

u u

ik v t ik v ti t ikz t

dW Kev E ec k z E kz t

dt

KEec kz t k z kz t k z

KEec e e e e

0( , ) cos( )xE z t E kz t ( ) cos( )x uK

v z c k z

The electron energy changes as described by the equation

2

8( ) sin(2 )w

uz z uk

z t v t v k t

Page 9: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 9

Nonlinear harmonic generation

sine ( )iY inn

n

J Y e

2

8w

u

kk

Y 2 z uv k t

2

8sin(2 )( )0

2

wz uku z u z uz

i v k tik v t ik v ti kv tKEdWec e e e e

dt

01( ) ( )

2u zi k k v t in

n nn

KEdWec e J Y J Y e

dt

Page 10: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 10

Nonlinear harmonic generation

01( ) ( ) cos( )

2 n nn

KEdWec J Y J Y

dt

(2 1)u z u zk k v t n k n k v t t

(2 1) 0u zd

k n k vdt

A steady energy transfer?

1 11

2 1u

z

k

k n

2 1 11

2 1n n

2

8w

u

kk

Y

2

1 21

22u K

Page 11: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 11

Nonlinear harmonic generation

2 1 1[ ] ( ) ( )n n n n nJJ J Y J Y 2

2(2 1)

4 2n

KY n

K

Effective coupling factors

Page 12: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 12

Nonlinear harmonic generation

2 1 1[ ] ( ) ( )n n n n nJJ J Y J Y 2

2(2 1)

4 2n

KY n

K

K = 1 K = 3 K = 10

Ratio of power gain length at the n-th harmonic to that at the fundamental:

1( ) 2 3

(1) 2[ ]

[ ]

n

n

L JJ

L n JJ

Page 13: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 13

Nonlinear harmonic generation

ˆ , 1, 2,...ˆ n nd

n Ndz

Normalized high-gain FEL model

ˆ ˆ( )ˆ

ninx

dE e

dz

11

2ˆ mN

iz

m

j eN

2 2

02

[ ]e rm c

EeK JJ

0

ˆ xx

EE

E

1ˆ ˆ( )

ˆ x zdE z j

dz

z z

Page 14: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 14

Nonlinear harmonic generation

ˆˆj

jd

dz

(1) (3) 3ˆ ˆ ˆ( )ˆ

n ni inx x

dE e E e

dz

(1)1

ˆ ˆ( )ˆ x zdE z j

dz

2(3) 3

31

ˆ ˆ( )ˆ x z

KdE z j

dz K

11

1

2 2

m

m

Ni

zm

i

j eN

e b

1

2 23 3ˆ(3) (3) (1)3 3

31 1 1

3ˆ ˆ ˆ( ) 3 ( ) ( )2ˆ

i zx x in

d K i KE z i E z E z e

K Kdz

33

1

2ˆ mN

iz

m

j eN

Page 15: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 15

Nonlinear harmonic generation

Page 16: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 16

Nonlinear harmonic generation

Near saturation, roughly 1% of the power of fundamental is emitted in the third harmonic

Spectrum has the same width as that of the fundamental

The maximal power is decreasing function of harmonic number

Nonlinear harmonics have larger statistical power fluctuations from shot to shot

Page 17: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 17

High-gain harmonic generation (HGHG)

energy modulation with frequency ω conversion in density modulations coherent radiation with frequency nω in radiator section

large energy spread

6n

/s

/s /s

Page 18: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 18

High-gain harmonic generation (HGHG)

in modulator energy changes phase remains approx. the same

0 0sinA

0 0 0 0 0 0( , ) ( ( , )) ( sin )f f f A

0 0 0 0 0( , ) ( )f f

Page 19: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 19

High-gain harmonic generation (HGHG)

in chicane higher energy particles are bent less than lower energy particles

energy of particles remains approx. the same

0 1 56k R

Page 20: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 20

High-gain harmonic generation (HGHG)

0 1 56 0 0

0 0 1 56 0

sin0 0 0 0

0 1 56 0 0 0

( , )

( )

( ) ( )

ih ihh

ih k R A

ih im ihk Rm

m

b e d d e f

d d e f

d e e J hk R A d e f

Page 21: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 21

High-gain harmonic generation (HGHG)

1 56 01 56 0 0 0( ) ( )ihk Rh hb J hk R A d f

2022

0 0( ) ~f e

21 561

21 56( )hk R

h hb J hk R A e

1 56 1.2hk R A h 561

1.2R

k A

2

0.72(1.2 )

h

Ah hb J h e

h A

h

Page 22: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 22

High-gain harmonic generation (HGHG)

L.H.Yu et al, PRL 91, 074801 (2003)

HGHG was demonstrated at the third harmonic of 800 nm

temporally coherent radiation

Page 23: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 23

Echo-enabled harmonic generation

G. Stupakov, PRL 102, 074801 (2009)

Page 24: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 24

Echo-enabled harmonic generation

Page 25: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 25

Echo-enabled harmonic generation

Page 26: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 26

Echo-enabled harmonic generation

For HGHG

210.721 30.7 hA

hb eh

For EEHG

11 3h

F Ab

h

Page 27: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 27

Echo-enabled harmonic generation

the first laser produces energy modulation the first chicane is strong, rotates phase space the second laser produces again energy modulation The second chicane converts the energy modulation in

density modulation

G. Stupakov, PRL 102, 074801 (2009)

Page 28: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 28

Echo-enabled harmonic generation

D.Xiang et al, PRL 108, 024802 (2012)

experiment for EEHGonly the second laser ON

both lasers ON

Page 29: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 29

Harmonic lasing

non-linear harmonicgeneration

harmoniclasing

ˆˆj

jd

dz

( )ˆ ˆˆ

nh hinx

h

dE e

dz

2( )

1

ˆ ˆ( )ˆ

h hx zh

KdE z j

dz K

ˆˆj

jd

dz

( )ˆ ˆˆ

nh hinx

dE e

dz

2( )

1

ˆ ˆ( )ˆ

h hx zh

KdE z j

dz K

Page 30: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 30

Harmonic lasing

retuned to fundamental

harmonic only

Page 31: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 31

Harmonic lasing

retuned to fundamental

harmonic only

Page 32: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 32

Harmonic lasing

Page 33: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 33

Purified SASE scheme

U1 U2 U3 … … U7 U8 U9 U10 U11 U12 U13 … U18

K = 2, λ1 =0.6 nm

6 GeV K=6.3,λ1 =4.2 nm

λ1 =0.6 nm

Page 34: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 34

Purified SASE scheme

U1 U2 U3 … … U7 U8 U9 U10 U11 U12 U13 … U18

K = 2, λ1 =0.6 nm

6 GeV K=6.3,λ1 =4.2 nm

λ1 =0.6 nm

At the exit of U10

At the exit of U11

At the exit of U9

2πlc≈1 fs

At the exit of U12

2πlc≈ 4~ 5 fs

Page 35: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 35

Energy spread cooling schemeH.Deng , arXiv:1305.7041 (2013)

16x R

0( ) (1 )K x K x

Page 36: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 36

Energy spread cooling scheme1

2 200 12 2

u K

2

21

22u K

22 00 16

0

20

0 16 020

1

12 2

2

ur

K R

KR

K

21

2 2u

rK

Page 37: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 37

Energy spread cooling scheme

20

0 16 0202

rK

RK

Two electrons through modulator

0 0 0 0, ,

0 0, ,

2 ud

kdz

0

4 4 ru uN N

0 0 0 0 0sinA A

0 2A

2

0 016 20 0 0

21 1

2

uN A KR

K

Page 38: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 38

Energy spread cooling scheme

20 0

16 200 0

21 1

2

uN A KR

K

-1m

16 mR

30b

H.Deng , arXiv:1305.7041 (2013)

Page 39: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 39

Energy spread cooling scheme

H.Deng , arXiv:1305.7041 (2013)

Page 40: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 40

Energy spread cooling scheme

1D simulations 3D simulations

H.Deng , arXiv:1305.7041 (2013)

Page 41: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

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Table-top FEL

External injection

Page 42: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 42

Table-top FEL

“Bubble” regime

Page 43: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 43

Table-top FEL

M.Fuchs et al, Nature Physics 5, 826(2009)

H.-P. Schlenvoigt et al, Nature Physics 4, 130 (2008)

λ=740 nm

λ=17 nmspontaneous undulator radiation with laser-plasma accelerator

Page 44: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 44

Table-top FEL

M.Fuchs et al, Nature Physics 5, 826(2009) no FEL radiation so far

Page 45: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 45

European XFEL

3rd SR generation

2nd SR generation

1st SRs

Outlook

Growth of brillance of X-ray and growth of computer power

Page 46: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 46

Outlook

Saturation?Wavelength of radiation

λ= 0.25 AMaRIE (Los Alamos)concept

Q. R. Marksteiner, FEL 2011, TUPA28, 2011

λ=0.5 A

Page 47: Lecture 6. New FEL Schemes and Challenges X-Ray Free Electron Lasers Igor Zagorodnov Deutsches Elektronen Synchrotron TU Darmstadt, Fachbereich 18 22

PD Dr. Igor Zagorodnov| X-Ray Free Electron Lasers. Lecture 6 | 22. June 2014 | Seite 47

Outlook

shorter wave length

shorter radiation pulses

higher brilliance

longitudinal coherence

compact facilities

„Meine Vision für DESY ist dass wir die deutsche Nobelpreisschmiede werden.“

Professor Helmut Dosch (Film „Licht der Zukunft“)