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John N. Galayda
LCLS Commissioning Workshop
22 September 2004 Welcome/Charge
Welcome to the Workshop
•LCLS Status
•Since the January Workshop
•Charge
John N. Galayda
LCLS Commissioning Workshop
22 September 2004 Welcome/Charge
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
LCLS Commissioning Workshop
22 September 2004 Welcome/Charge
Capacity- 30068,300 GSF Total150-Seat Auditorium
John N. Galayda
LCLS Commissioning Workshop
22 September 2004 Welcome/Charge
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
LCLS Commissioning Workshop
22 September 2004 Welcome/Charge
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
LCLS Commissioning Workshop
22 September 2004 Welcome/Charge
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
LCLS Commissioning Workshop
22 September 2004 Welcome/Charge
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
LCLS Commissioning Workshop
22 September 2004 Welcome/Charge
Welcome! Thanks for Coming!
John N. Galayda
LCLS Commissioning Workshop
22 September 2004 Welcome/Charge
End of Presentation