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LCLS Project Overview. What is the LCLS ? Transition from 3 rd generation light sources to x-ray free-electron lasers The SASE principle and linac-driven free-electron lasers Performance Accomplishments R&D and construction plan. What is the LCLS ?. Single pass Free-Electron Lasers

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lcls project overview
LCLS Project Overview
  • What is the LCLS ?
  • Transition from 3rd generation light sources to x-ray free-electron lasers
  • The SASE principle and linac-driven free-electron lasers
  • Performance
  • Accomplishments
  • R&D and construction plan
what is the lcls
What is the LCLS ?
  • Single pass Free-Electron Lasers
  • Uses SLAC Linac
  • 1.5 - 15 Å (0.5-5 Å in 3rd harmonic)
  • Peak brightness 10 orders of magnitude above Advanced Photon Source (APS)
  • Time averaged brightness 2-4 orders of magnitude above APS
  • Sub-picosecond pulses
  • Fully transversely coherent radiation
  • Design and R&D studies, a ANL-BNL-LANL-LLNL-SLAC-UCLA collaboration
  • The X-ray FEL is a powerful tool to explore matter and fundamental physics.
the sase principle and linac driven free electron lasers
Main components of a SASE FEL

A bright electron source (photo-injector)

A bunch compression system

A linear accelerator

An undulator

The photon beamlines

The experimental areas

The SASE principle and linac-driven free-electron lasers
sase fels
SASE FELs

SASE FEL theory well developed

and verified by simulations and experiments

  • FEL radiation starts from noise in spontaneous radiation
  • Transverse radiation electric field modulates the energy and bunches the electrons within an optical wavelength
  • Exponential build-up of radiation along undulator length

Saturation

Exponential Gain Regime

Undulator Regime

0.9 fs

1 % of X-Ray Pulse

0.2 fs

Electron BunchMicro-Bunching

main parameters
Wavelength 1.5 Å

(range 1.5-15 Å, 1st harm)

Electron energy 14.35 GeV (range 14.35-4.54)

Bunch length 230 fsec (full)

1012 coherent photons/pulse

Undulator length 120 m

Undulator gap 6 mm

Saturation peak power

9 GW

Peak brightness

1.2 1033

Average brightness

4.2 1022

Main parameters
light source performance chart
Light source performance chart

Average

Peak

Peak and time

averaged

brightness

of the LCLS and other facilities,

operating or

planned

other fel based light sources are being tested built or planned
Other FEL based light sources are being tested, built or planned
  • The TESLA Test Facility (TTF) at DESY
    • Lasing with gain ~3000 observed at 80-180 nm
  • X-ray FEL TESLA at DESY (associated with the linear collider project)
    • CDR being written
  • Source Development Laboratory (SDL) at BNL-NSLS
    • Electron beam testing
  • Harmonic Generation (HGHG) experiment successful at BNL-ATF
  • VISA experiment at BNL-ATF
    • Study the FEL radiation with beam characteristics and tolerances close to those of the LCLS
  • FELs under study in Japan, Italy, England and Germany (BESSY II)
  • LEUTL at ANL-APS
    • First observation of saturation
fel experiment
FEL experiment
  • A crucial milestone in FEL physics was reached when the LEUTL experiment measured large amplification and evidence of saturation last summer at 530 and 385 nm
slide11

6D particle tracking through LCLS accelerator

150 MeV

250 MeV

Energy deviation along electron bunch

Transverse cross section of electron beam

250 MeV

4.54 GeV

14.3 GeV

how to achieve a short bunch
How to achieve a short bunch
  • The simulation tool was used to optimize the electron beam in 6-dimensional phase space
    • Preservation of transverse electron brightness leads to shorter undulator and more relaxed tolerances
    • Mechanism for achieving short electron bunches (230 fs) confirmed by the simulations
    • Even shorter bunches can compromise transverse electron brightness

230 fs bunch length is the result of optimization in all 6 dimensions

x ray optics transport simulations

watts

c m2

watts

c m2

watts

c m2

watts

c m2

x 1015

x 1017

x 1017

x 1015

Power Density

Time

Domain

Frequency

Domain

Power Density

1.94

Temporal

Transform

1.73

0

0

w0-400/fs

w0

w0+400/fs

2

4

0

6

Time, femtoseconds

frequency

0

150

Spatial

Transform

Power Density

Power Density

1.94

1.73

0

0

-325

-10

304

-150

0

150

Wavenumber, mm-1

Transverse position, microns

X-ray optics transport simulations

Viewer

GINGER output:

Tables of electric field values

at undulator exit

at different times

viewer

R, mm

Transformation to

Frequency Domain

Propagation

to arbitrary

z

slide14

LCLS Undulator Hall and Experimental Area Layout

FFTB hall for undulator and diagnostics

Hall A:

Atomic Physics

Warm Dense Matter

X-Ray Physics

Hall B:

Nanoscale Dynamics

Femtochemistry

Biological Imaging

conceptual design report
Conceptual Design Report
  • Conceptual Design Report is on schedule
  • First draft contributions are being reviewed
  • Goal is to have it ready, in draft form, by early summer 2001
summary
Summary
  • Substantial progress made in most areas
  • Experimental confirmation of the photo-injector brightness is the most important short term goal
    • Program is receiving strong support from SLAC
  • Integration photo-injector/FEL physics/x-ray optics to continue
    • Realistic x-ray FEL characteristics, tolerances, match to the experiments
  • X-ray optics to address detailed requirements of the “first experiments”
  • Focus on CDR for the next 6-8 months
  • Preparation for Lehman Review