john n. galayda lcls commissioning [email protected] 22 september 2004...

John N. Galayda

LCLS Commissioning Workshop

[email protected]

22 September 2004 Welcome/Charge

Welcome to the Workshop

•LCLS Status

•Since the January Workshop

•Charge

John N. Galayda


[email protected]


Linac-to-Undulator (227m)

UndulatorHall (175m)Beam Dump (40M)Front End (29m)

NearExpt.Hall

X-rayTransport(250m)

FarExpt.Hall

2nd Undulator Line

3rd Undulator Line

John N. Galayda


[email protected]


Capacity- 30068,300 GSF Total150-Seat Auditorium

John N. Galayda


[email protected]


LCLS - Estimated Cost, ScheduleLCLS - Estimated Cost, Schedule

$273M Total Estimated Cost (includes $59.7M contingency)

$315M Total Project CostFY2005 Long-lead purchases for injector, undulatorFY2006 Construction beginsFY2008 Q2 FEL Commissioning begins September 2008 Construction complete – operations begin

2002 2003 2004 2005 2006 FY2008 FY2009

Construction Operation

FY2001 FY2002 FY2003 FY2004 FY2005 FY2006 FY2007

CD-1 CD-2a CD-2b

CD-3a

CD-3bCD-0Title IDesignComplete

XFELCommissioning

CD-4

Project Engineering Design Long-LeadProcurement

LCLS Undulator Diagnostics WorkshopLCLS Undulator Diagnostics Workshop John N. Galayda, SLACJohn N. Galayda, SLAC

Opening Comments and Charge 19 January 2004Opening Comments and Charge 19 January 2004 [email protected]

Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center

Challenges for Diagnostics in the Undulator ChannelChallenges for Diagnostics in the Undulator Channel

Tolerances on Trajectory are Tight for SASE at 1.5ÅTolerances on Trajectory are Tight for SASE at 1.5ÅBeam-based alignment, RFBPMs must deliver a good Beam-based alignment, RFBPMs must deliver a good trajectorytrajectory

Tolerance on K of an undulator is around 1.5 x 10Tolerance on K of an undulator is around 1.5 x 10-4-4

Equivalent to 50 micron vertical misplacementEquivalent to 50 micron vertical misplacement

This displacement does little to the electron opticsThis displacement does little to the electron optics

This displacement does little to the spontaneous spectrum This displacement does little to the spontaneous spectrum of 1 und.of 1 und.

Piezo end tuners provide adjustment equivalent to K~ 4x10Piezo end tuners provide adjustment equivalent to K~ 4x10--

44

Radiation Damage to Undulators is a ConcernRadiation Damage to Undulators is a ConcernInterlocks will be implemented but tolerable losses are lowInterlocks will be implemented but tolerable losses are low

Can the diagnostics identify a damaged undulator?Can the diagnostics identify a damaged undulator?

Tolerances on Trajectory are Tight for SASE at 1.5ÅTolerances on Trajectory are Tight for SASE at 1.5ÅBeam-based alignment, RFBPMs must deliver a good Beam-based alignment, RFBPMs must deliver a good trajectorytrajectory

Tolerance on K of an undulator is around 1.5 x 10Tolerance on K of an undulator is around 1.5 x 10-4-4

Equivalent to 50 micron vertical misplacementEquivalent to 50 micron vertical misplacement

This displacement does little to the electron opticsThis displacement does little to the electron optics

This displacement does little to the spontaneous spectrum This displacement does little to the spontaneous spectrum of 1 und.of 1 und.

Piezo end tuners provide adjustment equivalent to K~ 4x10Piezo end tuners provide adjustment equivalent to K~ 4x10--

44

Radiation Damage to Undulators is a ConcernRadiation Damage to Undulators is a ConcernInterlocks will be implemented but tolerable losses are lowInterlocks will be implemented but tolerable losses are low

Can the diagnostics identify a damaged undulator?Can the diagnostics identify a damaged undulator?

LCLS Undulator Diagnostics WorkshopLCLS Undulator Diagnostics Workshop John N. Galayda, SLACJohn N. Galayda, SLAC

Opening Comments and Charge 19 January 2004Opening Comments and Charge 19 January 2004 [email protected]

Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center

Charge – Will the Undulator Diagnostics Serve Commissioning and Operations Needs for the LCLS?Will the Undulator Diagnostics Serve Commissioning and Operations Needs for the LCLS? Charge – Will the Undulator Diagnostics Serve Commissioning and Operations Needs for the LCLS?Will the Undulator Diagnostics Serve Commissioning and Operations Needs for the LCLS?

CommissioningCommissioningCan diagnostics be used to troubleshoot the new hardware?Can diagnostics be used to troubleshoot the new hardware?Can diagnostics be used to guide path to saturation?Can diagnostics be used to guide path to saturation?

OperationsOperationsWill the diagnostics permit simple and speedy troubleshooting?Will the diagnostics permit simple and speedy troubleshooting?Reliability/Availability goals of the LCLS will be those of a light Reliability/Availability goals of the LCLS will be those of a light source source

Light diagnostics are crucialLight diagnostics are crucialCan the diagnostics survive at high power?Can the diagnostics survive at high power?If not, are we placing too heavy a reliance on data taken with low If not, are we placing too heavy a reliance on data taken with low charge?charge?

What are the alternatives?What are the alternatives?Variable gap?Variable gap?Rollaway undulators?Rollaway undulators?

Do we have redundant diagnostics capability where appropriate?Do we have redundant diagnostics capability where appropriate?Diagnostics that check the diagnosticsDiagnostics that check the diagnostics

CommissioningCommissioningCan diagnostics be used to troubleshoot the new hardware?Can diagnostics be used to troubleshoot the new hardware?Can diagnostics be used to guide path to saturation?Can diagnostics be used to guide path to saturation?

OperationsOperationsWill the diagnostics permit simple and speedy troubleshooting?Will the diagnostics permit simple and speedy troubleshooting?Reliability/Availability goals of the LCLS will be those of a light Reliability/Availability goals of the LCLS will be those of a light source source

Light diagnostics are crucialLight diagnostics are crucialCan the diagnostics survive at high power?Can the diagnostics survive at high power?If not, are we placing too heavy a reliance on data taken with low If not, are we placing too heavy a reliance on data taken with low charge?charge?

What are the alternatives?What are the alternatives?Variable gap?Variable gap?Rollaway undulators?Rollaway undulators?

Do we have redundant diagnostics capability where appropriate?Do we have redundant diagnostics capability where appropriate?Diagnostics that check the diagnosticsDiagnostics that check the diagnostics

John N. Galayda


[email protected]


Since the January Workshop

K adjustment in undulators implemented by “canted” poles – Adjustment range 0.56%

achieved by horizontal translation of undulator

We took the extra step to “rollaway” undulators

Electromagnet quadrupoles to be in baselineBeam-based alignment via 20% strength variation

Coarse steering by cam movers under und. + quads

Fine steering by dipole trims on quads

John N. Galayda


[email protected]


Undulator Diagnostics

Wire scanners/CTR monitors every 3rd undulator

NO inter-undulator x-ray diagnostics

End-of-undulator spectrometer as x-ray pulse length diagnostic

Subject of DESY/SLAC XFEL2004 workshophttp://www-ssrl.slac.stanford.edu/lcls/xfel2004/index.html

Improved understanding of spontaneous radiationshallow-angle reflection in beam pipe

Ideas for spectrometric diagnostics

John N. Galayda


[email protected]


Charge is Expanded:

Will the LCLS Diagnostics Serve Commissioning and Operations Needs for the LCLS?Will the LCLS Diagnostics Serve Commissioning and Operations Needs for the LCLS?

Last workshop we assumed the electron beam to be completely understood upstream of Last workshop we assumed the electron beam to be completely understood upstream of the undulatorthe undulator

This time we expand scope to consider start-to-end diagnosticsThis time we expand scope to consider start-to-end diagnosticsGoal: diagnostics to guide us from gun to SASE to characterization of x-ray beamGoal: diagnostics to guide us from gun to SASE to characterization of x-ray beamDiagnostics to understand the beam in detailDiagnostics to understand the beam in detailDiagnostics for feedback control (fluence, bunch length, etc.)Diagnostics for feedback control (fluence, bunch length, etc.)Diagnostics to troubleshoot problems along entire electron beam pathDiagnostics to troubleshoot problems along entire electron beam pathWe’d love to measure gain versus z for poor gain- was a blind spotWe’d love to measure gain versus z for poor gain- was a blind spotDo end-of-undulator x-ray diagnostics look like a viable commissioning/operation tool?Do end-of-undulator x-ray diagnostics look like a viable commissioning/operation tool?Alternative approaches to be considered?Alternative approaches to be considered?

Lock-in on modulation of electron beam properties?Lock-in on modulation of electron beam properties?Other ideas?Other ideas?

Diagnostics to provide data required for x-ray experimentsDiagnostics to provide data required for x-ray experimentsA recent concern of mine: diagnostics for wake field effects in undulator channelA recent concern of mine: diagnostics for wake field effects in undulator channel

John N. Galayda


[email protected]


Welcome! Thanks for Coming!

John N. Galayda


[email protected]


End of Presentation

john n. galayda lcls commissioning [email protected] 22 september 2004...

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