The Linac Coherent Light Source [email protected] Linac Coherent Light Source Stanford...

SLAC On-site Review 15 October 2002SLAC On-site Review 15 October 2002 John N. Galayda, SLACJohn N. Galayda, SLAC

The Linac Coherent Light SourceThe Linac Coherent Light Source1

[email protected]@slac.stanford.edu

Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center

The Linac Coherent Light Source (LCLS)John N. Galayda, Stanford Linear Accelerator Center

15 October 2002

The Linac Coherent Light Source (LCLS)John N. Galayda, Stanford Linear Accelerator Center

15 October 2002

What will it doWhat will it do

The ProjectThe Project

ResearchResearch

User ProgramUser Program

What will it doWhat will it do

The ProjectThe Project

ResearchResearch

User ProgramUser Program





What Will It DoWhat Will It Do

The world’s The world’s first first hard x-ray laser hard x-ray laser

Unprecedented brightness, Unprecedented Unprecedented brightness, Unprecedented time resolutiontime resolution

0.8 – 8 keV SASE Free Electron Laser0.8 – 8 keV SASE Free Electron Laser

Electron beam 4.5 – 14.35 GeV, from SLAC LinacElectron beam 4.5 – 14.35 GeV, from SLAC Linac

Peak power in SASE bandwidth 8 GWPeak power in SASE bandwidth 8 GW

Peak brightness 10Peak brightness 103333 photons/(mm photons/(mm22 mr mr22 0.1%BW) 0.1%BW)

Pulse duration Pulse duration 230 femtoseconds 230 femtoseconds

Pulse repetition rate 120 HzPulse repetition rate 120 Hz

The world’s The world’s first first hard x-ray laser hard x-ray laser

Unprecedented brightness, Unprecedented Unprecedented brightness, Unprecedented time resolutiontime resolution

0.8 – 8 keV SASE Free Electron Laser0.8 – 8 keV SASE Free Electron Laser

Electron beam 4.5 – 14.35 GeV, from SLAC LinacElectron beam 4.5 – 14.35 GeV, from SLAC Linac

Peak power in SASE bandwidth 8 GWPeak power in SASE bandwidth 8 GW

Peak brightness 10Peak brightness 103333 photons/(mm photons/(mm22 mr mr22 0.1%BW) 0.1%BW)

Pulse duration Pulse duration 230 femtoseconds 230 femtoseconds

Pulse repetition rate 120 HzPulse repetition rate 120 Hz





Femtochemistry

Nanoscale Dynamics in Condensed matter

Atomic Physics

Plasma and Warm Dense Matter

Structural Studies on SingleParticles and Biomolecules

FEL Science/Technology

Program developed by international team of ~45 scientists working with accelerator and laser physics communities

Aluminum plasma

10-4 10-2 1102 10 4

classical plasma

dense plasma

high density matter

G =1

Density (g/cm-3)

G =10

G =100

t=0

t=

“the beginning.... not the end”





Lasers probe charge dynamics

• Electron Diffraction limited to ps range• LCLS will probe 200 10 fs range

• Chemical dynamics happens in fs - ps range

H2OOH + H

about 10 fs

time depends on mass

CH2I2CH2I + I

about 100 fs

FemtochemistryFemtochemistry

Requirements: High peak brightness230 fsec or shorter pulse 0.8 - 8 keV x-raysSynchronization to laser





Nanoscale Dynamics inNanoscale Dynamics in Condensed matterCondensed matter

t=0

t=

In picoseconds - milliseconds range

sample

splitter

variable delay t

Analyze contrastas f(delay time)

Requirements: Maximum transverse coherence

230 fsec pulse

<8-24 keV x-rays (3rd harmonic)

Fast Array detectors





Formation of Hollow Atoms:

h900eVAuger

=2.5fs

Multiphoton Ionization:

h

h

Giant Coulomb explosions of Xe clusters

109 atoms

h950eV

Auger

=0.1fs3p (M3)

Xe

Understanding is central to the

imaging of biomolecules

Atomic PhysicsAtomic Physics

Requirements: High peak brightness230 fsec pulse <1 keV x-raysSynchronization to fast detectors





• Creating Warm Dense Matter• Generate ≤10 eV solid density matter• Measure the fundamental nature of the matter via equation of state

• Probing resonances in HDM• Measure kinetics process, redistribution rates, kinetic models• All time scales

Plasma Physics and Warm Dense Matter

Requirements: High peak power for plasma creation230 fsec pulse or less<8 keV x-raysSynchronization to external laser





Structural Studies on Single Particles andBiomolecules

Requirements: High peak brightness

High photon density

230 fs or shorter pulses

Fast array detectors





Puls e dura tion (FWHM) 10 fs 50 fs 100 fs 230 fs

Phot ons/pu lse (100 nm spot)(R = 15%)

5x1012 8x1011 3x1011 5x1010

Sing le lyso zyme molec uleMW: 19,806

26 Å 30 Å >30 Å >30 Å

3x3x3 cl uster of lyso zymesTotal MW: 535,000

<2.0 Å 3.0 Å 6.5 Å 12 Å

Sing le RUBISCO molec uleMW: 562,000

2.6 Å 4.0 Å 20 Å 30 Å

Sing le viral capsid (TBSV)MW: ~3,000,000

<2.0 Å <2.0 Å <2.0 Å 2.4 Å

Larger protein assemblies and viruses look promising

Calculated Limits of Resolution with Relectronic = 15 %

Structural Studies on Single Particles andBiomolecules





52 m52 m43 m43 m

ee

30 m30 m

SiSi monochromator monochromator((TT = 40%) = 40%)

230 fs 10 fs

•Electron pulse compression•X-ray pulse compression•Preservation of time structure•Coherence preservation•X-ray FEL diagnostics•Pump/probe synchronization

Two-Stage Chirped-Beam SASE-FEL for High Power Femtosecond X-Ray Pulse Generation

C. Schroeder*, J. Arthur^, P. Emma^,S. Reiche*, and C. Pellegrini*

^ Stanford Linear Accelerator Center*UCLA

FEL Physics and TechnologyFEL Physics and TechnologyX-ray FEL PhysicsX-ray FEL Physics





Estimated Cost, ScheduleEstimated Cost, Schedule

$200M-$240M Total Estimated Cost $200M-$240M Total Estimated Cost rangerange

$245M-$295M Total Project Cost range$245M-$295M Total Project Cost range

Schedule:Schedule:FY2003FY2003 Authorization to begin engineering design Authorization to begin engineering design

Emphasis on injector and undulatorEmphasis on injector and undulator

FY2005 FY2005 Long-lead purchases for injector, undulatorLong-lead purchases for injector, undulator

FY2006 Construction beginsFY2006 Construction begins

January 2007 January 2007 Injector tests beginInjector tests begin

October 2007October 2007 FEL tests beginFEL tests begin

September 2008 September 2008 Construction completeConstruction complete

$200M-$240M Total Estimated Cost $200M-$240M Total Estimated Cost rangerange

$245M-$295M Total Project Cost range$245M-$295M Total Project Cost range

Schedule:Schedule:FY2003FY2003 Authorization to begin engineering design Authorization to begin engineering design

Emphasis on injector and undulatorEmphasis on injector and undulator

FY2005 FY2005 Long-lead purchases for injector, undulatorLong-lead purchases for injector, undulator

FY2006 Construction beginsFY2006 Construction begins

January 2007 January 2007 Injector tests beginInjector tests begin

October 2007October 2007 FEL tests beginFEL tests begin

September 2008 September 2008 Construction completeConstruction complete





2002 2003 2004 2005 2006 FY2008 FY2009

Preliminary SchedulePreliminary Schedule

ConstructionConstruction OperatioOperationn

DesignDesignFY2001 FY2002 FY2003 FY2004 FY2005 FY2006 FY2007

CD-1

CD-2a

CD-2b

CD-3a

CD-3b

Critical Decision 0 – Mission Need June 13, 2001Critical Decision 1 – Preliminary Baseline Range September 2002Start Project Engineering Design October 2002Critical Decision 2a – Long-Lead Procurement Budget Spring 2003Critical Decision 2b – Performance Baseline April 2004Critical Decision 3a – Start Long-Lead Procurements August 2004Fund Long-Lead Procurements October 2004Critical Decision 3b – Start Construction August 2005Fund Construction October 2005Construction Complete End of FY2008

CD-0





LCLS PED/Project OrganizationLCLS PED/Project Organization

FEL PhysicsC. Pellegrini, UCLAH. D. Nuhn, SLAC

ES&H: Ian EvansSLAC Radiation Physics:

S. Rokni, S. M ao, W . R. Nelson, A. Prinz

1.2.1Injector

Jim Clendenin, SLAC

1.2.2Linac

Vinod Bharadwaj, SLAC

1.2.3Undulator

Efim G luskin, ANL

1.2Electron Beam

Systems

1.3.1 X-ray Transport, Optics,DiagnosticsRichard Bionta, LLNL

1.3.2 X-ray Endstation SystemsJerry Hastings, SLAC-SSRL

1.3Photon Beam

Systems

1.4 Conventional FacilitiesDavid Saenz, SLAC

Project M anagem entJohn Galayda - Project Director

L. Klaisner, Chief Engineer

FEL PhysicsC. Pellegrini, UCLAH. D. Nuhn, SLAC

ES&H: Ian EvansSLAC Radiation Physics:

S. Rokni, S. M ao, W . R. Nelson, A. Prinz

1.2.1Injector

Jim Clendenin, SLAC

1.2.2Linac

Vinod Bharadwaj, SLAC

1.2.3Undulator

Efim G luskin, ANL

1.2Electron Beam

Systems

1.3.1 X-ray Transport, Optics,DiagnosticsRichard Bionta, LLNL

1.3.2 X-ray Endstation SystemsJerry Hastings, SLAC-SSRL

1.3Photon Beam

Systems

1.4 Conventional FacilitiesDavid Saenz, SLAC

Project M anagem entJohn Galayda - Project Director

L. Klaisner, Chief Engineer

UCLAUCLA

LLNLLLNL

LCLS builds onSLAC, ANL, LLNL experience:PEP-II and APS Projects





LCLS Builds on SLAC Core CompetenciesLCLS Builds on SLAC Core Competencies

MOD1

KLY-1

GTFLASERROOM

GTFRF GUN

SSRL BOOSTER RING

MOD2

KLY-2MOD3

KLY-3

GTFCONTROLROOM

8 m LaserTransport System

SSRL Injector Vault

Gun R&DBNL/SLAC/UCLA Gun has been provenas an FEL driver at BNL-ATF and ANL

Basis of KEK, Frascati FEL designs

Design verification at the SSRL Gun Test Facility Limborg, C. et al., “PARMELA versus Measurements for GTF and DUVFEL” Proceedings of the 2002 European Particle Accelerator Conference, Paris 3-7 June 2002, pp. 1786-1788

-1.5 -1 -0.5 0 0.5 10

50

100

150

Time (ps)

Pea

k C

urre

nt (

A)

Instantaneous Peak Current

5 100

1

2

Slice Emittances n (

mm

mra

d)

Slice number

300pC head tail

Spectrometer Imageof Slice Quad Scan Data





LCLS Builds on SLAC Core CompetenciesLCLS Builds on SLAC Core Competencies

Definitive work in Coherent Synchrotron Radiation theory, modeling

(After BC1)

Theory (wig OFF)Theory (wig ON)Tracking (wig OFF)Tracking (wig ON)

RR

e–

zz

coherent radiation forcoherent radiation forzz

overtaking length:overtaking length: L L00 (24 (24zzRR22))1/31/3

LL00

Z. Huang, et al. PRSTAB 5, 074401 (2002)S. Heifets, et al. SLAC-PUB-9165, 3/2002P. Emma,2002 European Part. Accel. Conf.





LCLS Builds on SLAC and UCLA Core CompetenciesLCLS Builds on SLAC and UCLA Core Competencies

Definitive work in wake field effects-Bunch Length Control

IMPEDANCE OF A RECTANGULAR BEAM TUBE WITHSMALL CORRUGATIONS.K.L.F. Bane, G. Stupakov (SLAC). SLAC-PUB-9503, Sep 2002. 18pp. Submitted to Phys.Rev.ST Accel.Beams

EM Fields created in thewake of electron bunch

Energy loss of electronsversus position in bunch

Pulse length Control in an X-ray FELBy Using Wake FieldsS. Reiche, P. Emma, C. PellegriniTo be published in the proceedings of the joint ICFA Advanced AcceleratorAnd Beam Dynamics Workshop, Chia Laguna Sardinia, 4-6 July 2002

4 fs power spike producedBy current spike, wake field





LCLS Builds on LLNL Core CompetenciesLCLS Builds on LLNL Core Competencies

•LLNL tests of damage to silicon crystal•Exposure to high- power laser with similar energy deposition•Threshold for melting 0.16 J/cm2, as predicted in model

•Fabrication/test of refractive Fresnel lens•Machined with a diamond point





LCLS Builds on ANL Core CompetenciesLCLS Builds on ANL Core Competencies

8004000-400-800Z(mm)

-2.0

-1.0

0.0

1.0

2.0

Hor

izon

tal T

raje

ctor

y(µ

)

Horizontal Trajectory

Mic

ron

s

LCLS Undulator Prototype





SLAC Building New Core CompetenciesSLAC Building New Core Competencies

9 ps9 ps 0.4 ps0.4 ps<100 fs<100 fs

50 ps50 ps

SLAC LinacSLAC Linac

1 GeV1 GeV 20-50 GeV20-50 GeV

FFTBFFTB

12-meter chicane compressor 12-meter chicane compressor 12-meter chicane compressor 12-meter chicane compressor 5-meter undulator5-meter undulator5-meter undulator5-meter undulator

Ultrafast laser/x-ray physics - the Sub-Picosecond Photon Source

The SPPS collaboration will develop experimental techniques essential to LCLS science•Synchronization•Short pulse diagnostics for x-ray beams•Control of timing and pulse length





Workshop – Experimental Opportunities with LCLS – 8-9 October 2002 Workshop – Experimental Opportunities with LCLS – 8-9 October 2002

The LCLS Project is in its initial phase with a construction start scheduled for FY 2006. The DOE is planningThe LCLS Project is in its initial phase with a construction start scheduled for FY 2006. The DOE is planningto provide specific funding for construction of experiments after Critical Decision 3 (start of LCLS to provide specific funding for construction of experiments after Critical Decision 3 (start of LCLS construction) has been taken, expected in mid 2005 calendar year. However, DOE will, starting in FY2003, construction) has been taken, expected in mid 2005 calendar year. However, DOE will, starting in FY2003, review and fund proposals for research needed to design an LCLS experiment. The purpose of this review and fund proposals for research needed to design an LCLS experiment. The purpose of this Planning Workshop is to provide prospective LCLS researchers with the information necessary to start the Planning Workshop is to provide prospective LCLS researchers with the information necessary to start the experiment planning process. It will also mark the beginning of a dialog between future LCLS experimenters experiment planning process. It will also mark the beginning of a dialog between future LCLS experimenters and the Project Team that will shape the development of the LCLS from conceptual design to running and the Project Team that will shape the development of the LCLS from conceptual design to running facility. facility.

30 Attendees, including “first Experiments” co-authors30 Attendees, including “first Experiments” co-authors Presented Proposal/Review SequencePresented Proposal/Review Sequence LCLS Scientific Advisory Committee, chaired by Roger Falcone, UCBLCLS Scientific Advisory Committee, chaired by Roger Falcone, UCB Identification of R&D needs prerequisite to proposalsIdentification of R&D needs prerequisite to proposals Timing and related diagnosticsTiming and related diagnostics DetectorsDetectors Damage studiesDamage studies

The LCLS Project is in its initial phase with a construction start scheduled for FY 2006. The DOE is planningThe LCLS Project is in its initial phase with a construction start scheduled for FY 2006. The DOE is planningto provide specific funding for construction of experiments after Critical Decision 3 (start of LCLS to provide specific funding for construction of experiments after Critical Decision 3 (start of LCLS construction) has been taken, expected in mid 2005 calendar year. However, DOE will, starting in FY2003, construction) has been taken, expected in mid 2005 calendar year. However, DOE will, starting in FY2003, review and fund proposals for research needed to design an LCLS experiment. The purpose of this review and fund proposals for research needed to design an LCLS experiment. The purpose of this Planning Workshop is to provide prospective LCLS researchers with the information necessary to start the Planning Workshop is to provide prospective LCLS researchers with the information necessary to start the experiment planning process. It will also mark the beginning of a dialog between future LCLS experimenters experiment planning process. It will also mark the beginning of a dialog between future LCLS experimenters and the Project Team that will shape the development of the LCLS from conceptual design to running and the Project Team that will shape the development of the LCLS from conceptual design to running facility. facility.

30 Attendees, including “first Experiments” co-authors30 Attendees, including “first Experiments” co-authors Presented Proposal/Review SequencePresented Proposal/Review Sequence LCLS Scientific Advisory Committee, chaired by Roger Falcone, UCBLCLS Scientific Advisory Committee, chaired by Roger Falcone, UCB Identification of R&D needs prerequisite to proposalsIdentification of R&D needs prerequisite to proposals Timing and related diagnosticsTiming and related diagnostics DetectorsDetectors Damage studiesDamage studies





LCLS Science Program based on the SSRL ModelLCLS Science Program based on the SSRL Model

Experiment Proposals will be developed by leading research Experiment Proposals will be developed by leading research teams with SSRL involvementteams with SSRL involvement

Proposals will be reviewed by the LCLS Scientific Advisory Proposals will be reviewed by the LCLS Scientific Advisory CommitteeCommittee

Research teams secure outside funding with SSRL participation Research teams secure outside funding with SSRL participation and sponsorship as appropriateand sponsorship as appropriate

SSRL will manage constructionSSRL will manage constructionProvides cost and schedule control, rationalized designProvides cost and schedule control, rationalized design

Provides basis for establishing maintenance and support Provides basis for establishing maintenance and support infrastructureinfrastructure

SSRL will partner with research teams to commission endstationsSSRL will partner with research teams to commission endstationsTransit from commissioning to general user operations with Transit from commissioning to general user operations with deliberate speeddeliberate speed

““General user” mode with beam time allocation based on SAC General user” mode with beam time allocation based on SAC recommendationsrecommendations

Experiment Proposals will be developed by leading research Experiment Proposals will be developed by leading research teams with SSRL involvementteams with SSRL involvement

Proposals will be reviewed by the LCLS Scientific Advisory Proposals will be reviewed by the LCLS Scientific Advisory CommitteeCommittee

Research teams secure outside funding with SSRL participation Research teams secure outside funding with SSRL participation and sponsorship as appropriateand sponsorship as appropriate

SSRL will manage constructionSSRL will manage constructionProvides cost and schedule control, rationalized designProvides cost and schedule control, rationalized design

Provides basis for establishing maintenance and support Provides basis for establishing maintenance and support infrastructureinfrastructure

SSRL will partner with research teams to commission endstationsSSRL will partner with research teams to commission endstationsTransit from commissioning to general user operations with Transit from commissioning to general user operations with deliberate speeddeliberate speed

““General user” mode with beam time allocation based on SAC General user” mode with beam time allocation based on SAC recommendationsrecommendations





Experiment Requirements – Repetition RateExperiment Requirements – Repetition Rate

Rate limitsRate limitsPump/probe with low-power laser – 1-10 KHzPump/probe with low-power laser – 1-10 KHz

Pump/probe with high-power laser – 10 HzPump/probe with high-power laser – 10 Hz

Insert new sample – 0.1-100 HzInsert new sample – 0.1-100 Hz

Read out imaging data ~10 MB/shot, -> 1 GB/sec @ 120 HzRead out imaging data ~10 MB/shot, -> 1 GB/sec @ 120 Hz9 TB/day!9 TB/day!

Imaging detectors matched to LCLS don’t exist today – too slowImaging detectors matched to LCLS don’t exist today – too slow

Ideal bunch structure for ultrafast physics with an Ideal bunch structure for ultrafast physics with an FELFEL

Uniform spacingUniform spacing

10-1,000 Hz, consistent with limitations above10-1,000 Hz, consistent with limitations above

Rate limitsRate limitsPump/probe with low-power laser – 1-10 KHzPump/probe with low-power laser – 1-10 KHz

Pump/probe with high-power laser – 10 HzPump/probe with high-power laser – 10 Hz

Insert new sample – 0.1-100 HzInsert new sample – 0.1-100 Hz

Read out imaging data ~10 MB/shot, -> 1 GB/sec @ 120 HzRead out imaging data ~10 MB/shot, -> 1 GB/sec @ 120 Hz9 TB/day!9 TB/day!

Imaging detectors matched to LCLS don’t exist today – too slowImaging detectors matched to LCLS don’t exist today – too slow

Ideal bunch structure for ultrafast physics with an Ideal bunch structure for ultrafast physics with an FELFEL

Uniform spacingUniform spacing

10-1,000 Hz, consistent with limitations above10-1,000 Hz, consistent with limitations above





LCLSLCLS

Now – 120 Hz, 1 bunch per shot to one endstationNow – 120 Hz, 1 bunch per shot to one endstation

Future – up to 100 bunches per shot, 120 HzFuture – up to 100 bunches per shot, 120 HzFan out to multiple endstations, 120 HzFan out to multiple endstations, 120 Hz

1-100 bunches/shot at one endstation1-100 bunches/shot at one endstation

SLAC linac was designed for 360 Hz operationSLAC linac was designed for 360 Hz operation

Now – 120 Hz, 1 bunch per shot to one endstationNow – 120 Hz, 1 bunch per shot to one endstation

Future – up to 100 bunches per shot, 120 HzFuture – up to 100 bunches per shot, 120 HzFan out to multiple endstations, 120 HzFan out to multiple endstations, 120 Hz

1-100 bunches/shot at one endstation1-100 bunches/shot at one endstation

SLAC linac was designed for 360 Hz operationSLAC linac was designed for 360 Hz operation





TESLA Pulse Structure optimized for ColliderTESLA Pulse Structure optimized for Collider

Up to 11,000 bunches per power pulse in 1 msecUp to 11,000 bunches per power pulse in 1 msec

5-10 power pulses per second5-10 power pulses per second

TDR: 1.25 Hz at each undulatorTDR: 1.25 Hz at each undulator

1 msec light, 799 msec darkness1 msec light, 799 msec darkness

CW operation of SC linacCW operation of SC linacNot in TESLA-XFEL planNot in TESLA-XFEL plan

Part of BESSY designPart of BESSY design

Higher initial cost (15 MV/m or less)Higher initial cost (15 MV/m or less)Initial cost (+ space limitations at BESSY) vs cryocooling billInitial cost (+ space limitations at BESSY) vs cryocooling bill

CW gun must be developedCW gun must be developed

Up to 11,000 bunches per power pulse in 1 msecUp to 11,000 bunches per power pulse in 1 msec

5-10 power pulses per second5-10 power pulses per second

TDR: 1.25 Hz at each undulatorTDR: 1.25 Hz at each undulator

1 msec light, 799 msec darkness1 msec light, 799 msec darkness

CW operation of SC linacCW operation of SC linacNot in TESLA-XFEL planNot in TESLA-XFEL plan

Part of BESSY designPart of BESSY design

Higher initial cost (15 MV/m or less)Higher initial cost (15 MV/m or less)Initial cost (+ space limitations at BESSY) vs cryocooling billInitial cost (+ space limitations at BESSY) vs cryocooling bill

CW gun must be developedCW gun must be developed





ConclusionConclusion

LCLS poised to start Project Engineering DesignLCLS poised to start Project Engineering DesignPED for FY2003 - Preliminary design of undulator, injector – PED for FY2003 - Preliminary design of undulator, injector – CD-2ACD-2A

LCLS Collaboration well-matched to LCLS challengesLCLS Collaboration well-matched to LCLS challengesAccelerator science and technologyAccelerator science and technology

Synchrotron radiation research and instrumentationSynchrotron radiation research and instrumentation

Project management experienceProject management experience

Experiment Program Planning underway, based on Experiment Program Planning underway, based on successful SSRL modelsuccessful SSRL model

LCLS pre-proposal R&D requests starting FY2003LCLS pre-proposal R&D requests starting FY2003

Proposals for LCLS science in FY2006-FY2006 Proposals for LCLS science in FY2006-FY2006

LCLS poised to start Project Engineering DesignLCLS poised to start Project Engineering DesignPED for FY2003 - Preliminary design of undulator, injector – PED for FY2003 - Preliminary design of undulator, injector – CD-2ACD-2A

LCLS Collaboration well-matched to LCLS challengesLCLS Collaboration well-matched to LCLS challengesAccelerator science and technologyAccelerator science and technology

Synchrotron radiation research and instrumentationSynchrotron radiation research and instrumentation

Project management experienceProject management experience

Experiment Program Planning underway, based on Experiment Program Planning underway, based on successful SSRL modelsuccessful SSRL model

LCLS pre-proposal R&D requests starting FY2003LCLS pre-proposal R&D requests starting FY2003

Proposals for LCLS science in FY2006-FY2006 Proposals for LCLS science in FY2006-FY2006





SCRF vs. Copper for an FELSCRF vs. Copper for an FEL

SCRF: SCRF: Reduced wake field for long, high-charge bunches is an HEP trade-Reduced wake field for long, high-charge bunches is an HEP trade-offoff

SCRF has SCRF has no advantageno advantage over Cu in achieving FEL goals of over Cu in achieving FEL goals ofPeak brightnessPeak brightness

Short pulse (Wake fields of Cu are employed for bunch compression)Short pulse (Wake fields of Cu are employed for bunch compression)

CopperCopperHigher transverse wake trade-off against higher gradient at low Higher transverse wake trade-off against higher gradient at low energyenergy

FEL bunch length is shortFEL bunch length is short

FEL bunch charge is lower than collider requirementsFEL bunch charge is lower than collider requirements

Transverse wakes not an issue above 250 MeVTransverse wakes not an issue above 250 MeV

Italy, Japan choosing copper linac for green-field FELsItaly, Japan choosing copper linac for green-field FELsAt least 30% cost savings compared to SCRFAt least 30% cost savings compared to SCRF

SCRF: SCRF: Reduced wake field for long, high-charge bunches is an HEP trade-Reduced wake field for long, high-charge bunches is an HEP trade-offoff

SCRF has SCRF has no advantageno advantage over Cu in achieving FEL goals of over Cu in achieving FEL goals ofPeak brightnessPeak brightness

Short pulse (Wake fields of Cu are employed for bunch compression)Short pulse (Wake fields of Cu are employed for bunch compression)

CopperCopperHigher transverse wake trade-off against higher gradient at low Higher transverse wake trade-off against higher gradient at low energyenergy

FEL bunch length is shortFEL bunch length is short

FEL bunch charge is lower than collider requirementsFEL bunch charge is lower than collider requirements

Transverse wakes not an issue above 250 MeVTransverse wakes not an issue above 250 MeV

Italy, Japan choosing copper linac for green-field FELsItaly, Japan choosing copper linac for green-field FELsAt least 30% cost savings compared to SCRFAt least 30% cost savings compared to SCRF





End of Presentation





Peak and time

averaged

brightness

of the LCLS and

other facilities

operating or

under

construction

Performance Characteristics

LEUTL

TTF FEL

LCLS Spontaneous

DESY XFEL

LCLS

TESLA





Linac CenterLine

Sector 20 Linacs

Straight AheadTune-Up Dump

Sector 21-1B

5 meters

Scale:

L0-1

L0-2

RF TransverseDeflector

EmittanceWire Scanners Energy Wire

Scanner & OTR

Matching Section

Quadrupole,typ.

RFGun

Cathode LoadLock

DL1 Bend

Linac Solenoid

Gun Solenoid

Gun-to-Linac

L0 Linacs

Linac Coherent Light Source

1992: Proposal (C. Pellegrini)1998: Preliminary Design Study Completed1999: R&D funded at $1.5M/year2001: CD-02002: Conceptual Design http://www-ssrl.slac.stanford.edu/lcls/CDR/2003: Project Engineering Design begins2005: Long-Lead Procurements begin2006: Construction begins2007: First Light2008: Project completion

SLAC Linac

Two Chicanes for bunch compression

FFTB TunnelUndulator Hall





Conventional ConstructionConventional Construction

Final Focus Test Beam ExtensionFinal Focus Test Beam Extension

Hall AHall A

TunnelTunnel

Hall BHall B

Final Focus Test Beam ExtensionFinal Focus Test Beam Extension

Hall AHall A

TunnelTunnel

Hall BHall B

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