SLAC On-site Review 15 October SLAC On-site Review 15 October 2002 2002 John N. Galayda, SLAC John N. Galayda, SLAC The Linac Coherent Light Source The Linac Coherent Light Source 1 [email protected][email protected]Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center The Linac Coherent Light Source (LCLS) John N. Galayda, Stanford Linear Accelerator Center 15 October 2002 What will it do What will it do The Project The Project Research Research User Program User Program
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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
Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center
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
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 Source12
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
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 Source14
Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center
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
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 Source16
Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center
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
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 Source18
Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center
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
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 Source19
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
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 Source21
Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center
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
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 Source22
Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center
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
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 Source23
Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center
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
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 Source25
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
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
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 Source26
Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center
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
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
Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center
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
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 Source28