Download presentation

Presentation is loading. Please wait.

1
**A Free Electron Laser Project at LNF**

Massimo Ferrario INFN - LNF & the SPARC/X Team prova

2
**Synchrotron Radiation Free Electron Laser (FEL) **

Outline Atomic Laser Synchrotron Radiation Free Electron Laser (FEL) SPARC - SPARXINO - SPARX Applications prova

3
**Light Amplification by Stimulated Emission of Radiation**

Atomic Laser Light Amplification by Stimulated Emission of Radiation Spontaneous Emission Stimulated Emission prova

4
**Properties of Stimulated Emission**

The photon which is emitted in the stimulated emission process is identical to the incoming photon. They both have: 1. Identical wavelengths - Monochromaticity. 2. Identical directions in space - Directionality. 3. Identical phase - Coherence. prova

5
prova

6
**1. Well known and proven technology. 2. One Laser One Color. **

Atomic Laser 1. Well known and proven technology. 2. One Laser One Color. 3. Limited by Mirrors ==> No X rays. prova

7
Cosmic MASER

8
**Synchrotron Radiation**

prova

9
**Charged particle moving on a circle**

Radiation Simulator – T. prova

10
Pulse Duration prova

11
**Cut-Off Frequency of the Spectrum**

Revolution Frequency N Cut-Off Frequency of the Spectrum prova

12
prova

13
Undulator Radiation prova

14
Undulator Radiation The electron trajectory is determined by the undulator field and the electron energy The electron trajectory is inside the radiation cone if prova

15
**Relativistic Mirrors TUNABILITY Counter propagating pseudo-radiation**

Compton back-scattered radiation in the moving mirror frame Doppler effect in the laboratory frame TUNABILITY prova

16
**Radiation Simulator – T. Shintake, @ http://www-xfel. spring8. or**

prova

17
Nu = 5 { { { { { Due to the finite duration the radiation is not monochromatic but contains a frequency spectrum which is obtained by Fourier transformation of a truncated plane wave prova

18
Spectral Intensity Line width prova

19
**WE NEED micro-BUNCHING !**

Peak power of accelerated charge: different electrons radiate indepedently hence the total power depends linearly on the number Ne of electrons per bunch: Incoherent Spontaneous Radiation Power: Coherent Stimulated Radiation Power: WE NEED micro-BUNCHING ! prova

20
prova

21
High Gain FEL Consider“seeding”by an external light source with wavelength r The light wave is co-propagating with the relativistic electron beam Energy exchange occurs only if there is transverse motion prova

22
**if the flight time delay is exactly one radiation period:**

After one wiggler period the electron sees the radiation with the same phase if the flight time delay is exactly one radiation period: In a resonant and randomly phased electron beam, nearly one half electrons absorb energy and half lose enrgy, with no net gain The particles bunch around a phase for which there is no coupling with the radiation prova

23
**Newton Lorentz Equations**

Question: can there be a continuous energy transfer from electron beam to light wave? Answer: We need a Self Consistent Treatment Newton Lorentz Equations Maxwell Equations l /2 t>0 t=0 Optical potential prova

24
**Result: collective instability, exponential growth of radiation power.**

The electron beam acts as a dielectric medium which slows down the phase velocity of the ponderomotive field compared to the average electron longitudinal velocity. Hence resonant electrons bunch around a phase corresponding to gain. The particles within a micro-bunch radiate coherently. The resulting strong radiationfield enhances the micro-bunching even further. Result: collective instability, exponential growth of radiation power. Even if there is no external seeding: Self Amplified Spontaneous Emission prova

25
**SASE Saturation Results**

LEUTL APS/ANL 385 nm September 2000 Since September 2000: 3 SASE FEL’s demonstrate saturation TTF-FEL DESY 98 nm VISA ATF/BNL 840 nm March 2001 prova

26
TTF FEL LEUTLE prova

27
**SASE Longitudinal coherence**

ζ independent processes Slippage length The radiation “slips” over the electrons for a distance Nurad prova

28
SASE Courtesy L. Giannessi (Perseo in 1D mode prova

29
prova

30
SEEDING Courtesy L. Giannessi (Perseo in 1D mode prova

31
prova

32
prova

33
**High Brightness Electron Beams**

prova

34
**Linear Accelerators PRINCIPIO:**

Le particelle emesse da un filamento vengono accelerate dal campo elettrico longitudinale generato da elettrodi susseguenti. prova

35
**Linear Radio-Frequency Accelerators**

fascio Campo elettrico prova

36
**Electron Photo-Injector**

prova

37
**SPARC - SPARXINO - SPARX**

prova

38
prova

39
**GENESIS simulation of the SPARC SASE-FEL**

Radiation power growth along the 530 nm prova

40
SPARC DESY BNL UCLA SLAC UE MOU EUROFEL prova

41
prova

42
**SPARC Injector + DAFNE Linac a <10 nm SASE FEL source at LNF**

SPARXINO a <10 nm SASE FEL source at LNF Energy [GeV] cr [nm] I = 1 kA K = 3 e = 0.1 % n=4 n=1 prova

43
The FEL Applications prova

44
**Scientific case: new research frontiers in**

Atomic, molecular and cluster physics Plasma and warm dense matter Condensed matter physics Material science Femtosecond chemistry Life science Single Biological molecules and clusters Imaging/holography Micro and nano lithography Short Pulses prova

45
**Free Electron Lasers: applicazioni**

diminuire la lunghezza d’onda (λ-> raggi X) Impulsi ultra-corti aumentare potenza media (per λ nell’ IR-UV) Applicazioni mediche e industriali Struttura della materia,ad es. Dinamica delle molecole, reazioni chimiche prova

46
**used spark photography to freeze this ‘ultra-fast’ process**

E. Muybridge at L. Stanford in 1878 disagree whether all feet leave the ground during gallop… E. Muybridge used spark photography to freeze this ‘ultra-fast’ process E. Muybridge, Animals in Motion, ed. L. S. Brown (Dover Pub. Co., New York 1957) Courtesy Paul Emma (SLAC). prova

47
prova

48
**Coulomb Explosion of Lysozyme (50 fs)**

Single Molecule Imaging with Intense X-rays Atomic and molecular dynamics occur at the fsec-scale J. Hajdu, Uppsala U. prova

49
**X-FEL based on last 1-km of existing SLAC linac**

LCLS at SLAC Å X-FEL based on last 1-km of existing SLAC linac prova

50
**TESLA XFEL at DESY 0.85-60 Å X-FEL Integrated into linear collider**

user facility Å multiple undulators X-FEL Integrated into linear collider prova

51
prova

52
THE END

Similar presentations

Presentation is loading. Please wait....

OK

1

1

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google