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Undulator Parameter Workshop, May 21-23, Undulator Parameter Workshop, May 21-23, 20032003
Heinz-Dieter Nuhn, SLAC / SSRLHeinz-Dieter Nuhn, SLAC / SSRL
Overview of Proposed Parameter ChangesOverview of Proposed Parameter Changes Nuhn@slac.stanford.eduNuhn@slac.stanford.edu
Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center
Overview of Proposed Parameter ChangesHeinz-Dieter Nuhn, SLAC / SSRL
October 24, 2003
Overview of Proposed Parameter ChangesHeinz-Dieter Nuhn, SLAC / SSRL
October 24, 2003
Calculation of On-Axis Undulator FieldCalculation of On-Axis Undulator Field Undulator PeriodUndulator Period Maximum Available Linac EnergyMaximum Available Linac Energy Undulator Gap SelectionUndulator Gap Selection New Break DistancesNew Break Distances Reduction in Focusing StrengthReduction in Focusing Strength
Calculation of On-Axis Undulator FieldCalculation of On-Axis Undulator Field Undulator PeriodUndulator Period Maximum Available Linac EnergyMaximum Available Linac Energy Undulator Gap SelectionUndulator Gap Selection New Break DistancesNew Break Distances Reduction in Focusing StrengthReduction in Focusing Strength
Undulator Parameter Workshop, May 21-23, Undulator Parameter Workshop, May 21-23, 20032003
Heinz-Dieter Nuhn, SLAC / SSRLHeinz-Dieter Nuhn, SLAC / SSRL
Overview of Proposed Parameter ChangesOverview of Proposed Parameter Changes Nuhn@slac.stanford.eduNuhn@slac.stanford.edu
Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center
IntroductionIntroductionIntroductionIntroduction
Original 6-mm gap height too small Original 6-mm gap height too small
Increase in gap can open spectral range to 1 ÅIncrease in gap can open spectral range to 1 Å
50% Power Reduction of at 1.5 Å50% Power Reduction of at 1.5 Å
Undulator field adjustment comb structureUndulator field adjustment comb structure
Power tapering after saturation replenishes powerPower tapering after saturation replenishes power
Original 6-mm gap height too small Original 6-mm gap height too small
Increase in gap can open spectral range to 1 ÅIncrease in gap can open spectral range to 1 Å
50% Power Reduction of at 1.5 Å50% Power Reduction of at 1.5 Å
Undulator field adjustment comb structureUndulator field adjustment comb structure
Power tapering after saturation replenishes powerPower tapering after saturation replenishes power
Undulator Parameter Workshop, May 21-23, Undulator Parameter Workshop, May 21-23, 20032003
Heinz-Dieter Nuhn, SLAC / SSRLHeinz-Dieter Nuhn, SLAC / SSRL
Overview of Proposed Parameter ChangesOverview of Proposed Parameter Changes Nuhn@slac.stanford.eduNuhn@slac.stanford.edu
Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center
Workshop FocusWorkshop FocusWorkshop FocusWorkshop Focus
Undulator PeriodUndulator Period
Reduction of maximum available linac energyReduction of maximum available linac energy
Undulator gap \height increaseUndulator gap \height increase
Longer break distancesLonger break distances
Weaker FODO latticeWeaker FODO lattice
Undulator PeriodUndulator Period
Reduction of maximum available linac energyReduction of maximum available linac energy
Undulator gap \height increaseUndulator gap \height increase
Longer break distancesLonger break distances
Weaker FODO latticeWeaker FODO lattice
Undulator Parameter Workshop, May 21-23, Undulator Parameter Workshop, May 21-23, 20032003
Heinz-Dieter Nuhn, SLAC / SSRLHeinz-Dieter Nuhn, SLAC / SSRL
Overview of Proposed Parameter ChangesOverview of Proposed Parameter Changes Nuhn@slac.stanford.eduNuhn@slac.stanford.edu
Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center
PresentationsPresentationsPresentationsPresentations
Charge – M. ReichanadterCharge – M. Reichanadter
Undulator design requirements – S. MiltonUndulator design requirements – S. Milton
Description of new parameters – H.-D. NuhnDescription of new parameters – H.-D. Nuhn
Status of field adjustment comb – J. NoonanStatus of field adjustment comb – J. Noonan
FEL simulation work using new parameters FEL simulation work using new parameters GENESIS 1.3 – S. ReicheGENESIS 1.3 – S. Reiche
GINGER – W.M. FawleyGINGER – W.M. Fawley
RON – R. DejusRON – R. Dejus
BBA with new parameters – P. EmmaBBA with new parameters – P. Emma
Charge – M. ReichanadterCharge – M. Reichanadter
Undulator design requirements – S. MiltonUndulator design requirements – S. Milton
Description of new parameters – H.-D. NuhnDescription of new parameters – H.-D. Nuhn
Status of field adjustment comb – J. NoonanStatus of field adjustment comb – J. Noonan
FEL simulation work using new parameters FEL simulation work using new parameters GENESIS 1.3 – S. ReicheGENESIS 1.3 – S. Reiche
GINGER – W.M. FawleyGINGER – W.M. Fawley
RON – R. DejusRON – R. Dejus
BBA with new parameters – P. EmmaBBA with new parameters – P. Emma
Undulator Parameter Workshop, May 21-23, Undulator Parameter Workshop, May 21-23, 20032003
Heinz-Dieter Nuhn, SLAC / SSRLHeinz-Dieter Nuhn, SLAC / SSRL
Overview of Proposed Parameter ChangesOverview of Proposed Parameter Changes Nuhn@slac.stanford.eduNuhn@slac.stanford.edu
Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center
Expected Workshop OutcomeExpected Workshop OutcomeExpected Workshop OutcomeExpected Workshop Outcome
Signed Document: Workshop SummarySigned Document: Workshop Summary
Target Date: Mid November 2003Target Date: Mid November 2003
PurposePurpose
Implement the new parametersImplement the new parameters
Document the changesDocument the changes
Signed Document: Workshop SummarySigned Document: Workshop Summary
Target Date: Mid November 2003Target Date: Mid November 2003
PurposePurpose
Implement the new parametersImplement the new parameters
Document the changesDocument the changes
Undulator Parameter Workshop, May 21-23, Undulator Parameter Workshop, May 21-23, 20032003
Heinz-Dieter Nuhn, SLAC / SSRLHeinz-Dieter Nuhn, SLAC / SSRL
Overview of Proposed Parameter ChangesOverview of Proposed Parameter Changes Nuhn@slac.stanford.eduNuhn@slac.stanford.edu
Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center
Halbach formula for hybrid undulator is used to Halbach formula for hybrid undulator is used to estimate relation between gap/period and on-axis estimate relation between gap/period and on-axis fieldfield
Measured prototype field 5.3% larger than estimatedMeasured prototype field 5.3% larger than estimated
Halbach formula for hybrid undulator is used to Halbach formula for hybrid undulator is used to estimate relation between gap/period and on-axis estimate relation between gap/period and on-axis fieldfield
Measured prototype field 5.3% larger than estimatedMeasured prototype field 5.3% larger than estimated
Adjusting Estimate of On-Axis Undulator FieldAdjusting Estimate of On-Axis Undulator FieldAdjusting Estimate of On-Axis Undulator FieldAdjusting Estimate of On-Axis Undulator Field
2gap gap
b cperiod periodB a e
3.44 T
5.08
1.54
a
b
c
3 cm1.325 T
6.00 mm
periodB
gap
6.35
3 cm1.325 T
mm
periodB
gap
5.08
1.5
3.6
4
2 Ta
b
c
Undulator Parameter Workshop, May 21-23, Undulator Parameter Workshop, May 21-23, 20032003
Heinz-Dieter Nuhn, SLAC / SSRLHeinz-Dieter Nuhn, SLAC / SSRL
Overview of Proposed Parameter ChangesOverview of Proposed Parameter Changes Nuhn@slac.stanford.eduNuhn@slac.stanford.edu
Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center
Undulator PeriodUndulator PeriodUndulator PeriodUndulator Period
Present undulator period length of 3 cm is near Present undulator period length of 3 cm is near optimum for shortest gain lengthoptimum for shortest gain length
Change of undulator period length would require more Change of undulator period length would require more man-power and time than available before next reviewman-power and time than available before next review
Undulator period length will be kept at Undulator period length will be kept at
uu = 3 cm = 3 cm
Present undulator period length of 3 cm is near Present undulator period length of 3 cm is near optimum for shortest gain lengthoptimum for shortest gain length
Change of undulator period length would require more Change of undulator period length would require more man-power and time than available before next reviewman-power and time than available before next review
Undulator period length will be kept at Undulator period length will be kept at
uu = 3 cm = 3 cm
Undulator Parameter Workshop, May 21-23, Undulator Parameter Workshop, May 21-23, 20032003
Heinz-Dieter Nuhn, SLAC / SSRLHeinz-Dieter Nuhn, SLAC / SSRL
Overview of Proposed Parameter ChangesOverview of Proposed Parameter Changes Nuhn@slac.stanford.eduNuhn@slac.stanford.edu
Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center
Maximum Available Linac EnergyMaximum Available Linac EnergyMaximum Available Linac EnergyMaximum Available Linac Energy
14.35 GeV has been nominal energy to reach 1.5 Å14.35 GeV has been nominal energy to reach 1.5 Å
Loss of available linac energy due toLoss of available linac energy due to Removal of linac sectionRemoval of linac section
Off-crest accelerationOff-crest acceleration
New maximum energy set to 14.1 GeV to restore New maximum energy set to 14.1 GeV to restore operational overheadoperational overhead
Requires change in K valueRequires change in K value
14.35 GeV has been nominal energy to reach 1.5 Å14.35 GeV has been nominal energy to reach 1.5 Å
Loss of available linac energy due toLoss of available linac energy due to Removal of linac sectionRemoval of linac section
Off-crest accelerationOff-crest acceleration
New maximum energy set to 14.1 GeV to restore New maximum energy set to 14.1 GeV to restore operational overheadoperational overhead
Requires change in K valueRequires change in K value
Undulator Parameter Workshop, May 21-23, Undulator Parameter Workshop, May 21-23, 20032003
Heinz-Dieter Nuhn, SLAC / SSRLHeinz-Dieter Nuhn, SLAC / SSRL
Overview of Proposed Parameter ChangesOverview of Proposed Parameter Changes Nuhn@slac.stanford.eduNuhn@slac.stanford.edu
Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center
Undulator Gap SelectionUndulator Gap SelectionUndulator Gap SelectionUndulator Gap Selection
Undulator gap height changes still possibleUndulator gap height changes still possible
Present gap height: 6 mmPresent gap height: 6 mm
Gap height corrected for measured field: 6.35 mmGap height corrected for measured field: 6.35 mm
Parameter correction for reduced maximum energyParameter correction for reduced maximum energy
Larger gap gives access to short wavelength 1.0 ÅLarger gap gives access to short wavelength 1.0 Å
Undulator gap height changes still possibleUndulator gap height changes still possible
Present gap height: 6 mmPresent gap height: 6 mm
Gap height corrected for measured field: 6.35 mmGap height corrected for measured field: 6.35 mm
Parameter correction for reduced maximum energyParameter correction for reduced maximum energy
Larger gap gives access to short wavelength 1.0 ÅLarger gap gives access to short wavelength 1.0 Å
max
6.5 mm
1.296 T
3.630
gap
B
K
14.06 GeV 1.5 Å
4.45 GeV 15.0 År
r
E
E
max
8.2 mm
1.013 T
2.838
gap
B
K
14.03 GeV 1.0 Å
11.46 GeV 1.5 Å
3.62 GeV 15.0 Å
r
r
r
E
E
E
New ParametersNew ParametersNew ParametersNew Parameters
Undulator Parameter Workshop, May 21-23, Undulator Parameter Workshop, May 21-23, 20032003
Heinz-Dieter Nuhn, SLAC / SSRLHeinz-Dieter Nuhn, SLAC / SSRL
Overview of Proposed Parameter ChangesOverview of Proposed Parameter Changes Nuhn@slac.stanford.eduNuhn@slac.stanford.edu
Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center
1.5 Å at Reduced Electron Beam Energy1.5 Å at Reduced Electron Beam Energy1.5 Å at Reduced Electron Beam Energy1.5 Å at Reduced Electron Beam Energy
With the 8.2 mm gap the 1.5 Å radiation is produced With the 8.2 mm gap the 1.5 Å radiation is produced at lower energy (14.35 GeV 11.46 GeV) and at lower energy (14.35 GeV 11.46 GeV) and smaller undulator parameter (3.711 2.838).smaller undulator parameter (3.711 2.838).
FEL output power reduced by 50 %.FEL output power reduced by 50 %.
Problem for experiments that need as large a Problem for experiments that need as large a number of photons a possible, such as imaging of number of photons a possible, such as imaging of bio-molecules.bio-molecules.
Solution: New Field Adjustment Comb allows Solution: New Field Adjustment Comb allows tapering the undulator after the saturation point.tapering the undulator after the saturation point.
Tapering by about 0.3 % over the last 30 m more Tapering by about 0.3 % over the last 30 m more than restores the lost energythan restores the lost energy
With the 8.2 mm gap the 1.5 Å radiation is produced With the 8.2 mm gap the 1.5 Å radiation is produced at lower energy (14.35 GeV 11.46 GeV) and at lower energy (14.35 GeV 11.46 GeV) and smaller undulator parameter (3.711 2.838).smaller undulator parameter (3.711 2.838).
FEL output power reduced by 50 %.FEL output power reduced by 50 %.
Problem for experiments that need as large a Problem for experiments that need as large a number of photons a possible, such as imaging of number of photons a possible, such as imaging of bio-molecules.bio-molecules.
Solution: New Field Adjustment Comb allows Solution: New Field Adjustment Comb allows tapering the undulator after the saturation point.tapering the undulator after the saturation point.
Tapering by about 0.3 % over the last 30 m more Tapering by about 0.3 % over the last 30 m more than restores the lost energythan restores the lost energy
Undulator Parameter Workshop, May 21-23, Undulator Parameter Workshop, May 21-23, 20032003
Heinz-Dieter Nuhn, SLAC / SSRLHeinz-Dieter Nuhn, SLAC / SSRL
Overview of Proposed Parameter ChangesOverview of Proposed Parameter Changes Nuhn@slac.stanford.eduNuhn@slac.stanford.edu
Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center
New Break LengthsNew Break LengthsNew Break LengthsNew Break Lengths
Separations between undulator modules (breaks) Separations between undulator modules (breaks) designed to produce slippage by integer number of optical designed to produce slippage by integer number of optical wavelength.wavelength.
Break increments for adding slippage of 1 optical Break increments for adding slippage of 1 optical wavelength is wavelength is LLBB==uu (1+K (1+K22/2). /2).
LLBB=23.7 cm (old); 15.1 cm (new)=23.7 cm (old); 15.1 cm (new)
Present design uses break pattern 1-1-2 which Present design uses break pattern 1-1-2 which corresponds to the lengths sequence corresponds to the lengths sequence 18.7 cm – 18.7 cm – 42.1 cm 18.7 cm – 18.7 cm – 42.1 cm
18.7 cm gives not enough space for quads, BPMs, etc. 18.7 cm gives not enough space for quads, BPMs, etc. 42.1 cm gives not enough space for x-ray diagnostics42.1 cm gives not enough space for x-ray diagnostics
New break pattern 3-3-4 (or 3-3-5) corresponding to lengthNew break pattern 3-3-4 (or 3-3-5) corresponding to lengthsequence 44.6 cm – 44.6 cm – 55.7 cmsequence 44.6 cm – 44.6 cm – 55.7 cm (or 44.6 cm – 44.6 cm – 70.8 cm) (or 44.6 cm – 44.6 cm – 70.8 cm)
Separations between undulator modules (breaks) Separations between undulator modules (breaks) designed to produce slippage by integer number of optical designed to produce slippage by integer number of optical wavelength.wavelength.
Break increments for adding slippage of 1 optical Break increments for adding slippage of 1 optical wavelength is wavelength is LLBB==uu (1+K (1+K22/2). /2).
LLBB=23.7 cm (old); 15.1 cm (new)=23.7 cm (old); 15.1 cm (new)
Present design uses break pattern 1-1-2 which Present design uses break pattern 1-1-2 which corresponds to the lengths sequence corresponds to the lengths sequence 18.7 cm – 18.7 cm – 42.1 cm 18.7 cm – 18.7 cm – 42.1 cm
18.7 cm gives not enough space for quads, BPMs, etc. 18.7 cm gives not enough space for quads, BPMs, etc. 42.1 cm gives not enough space for x-ray diagnostics42.1 cm gives not enough space for x-ray diagnostics
New break pattern 3-3-4 (or 3-3-5) corresponding to lengthNew break pattern 3-3-4 (or 3-3-5) corresponding to lengthsequence 44.6 cm – 44.6 cm – 55.7 cmsequence 44.6 cm – 44.6 cm – 55.7 cm (or 44.6 cm – 44.6 cm – 70.8 cm) (or 44.6 cm – 44.6 cm – 70.8 cm)
Undulator Parameter Workshop, May 21-23, Undulator Parameter Workshop, May 21-23, 20032003
Heinz-Dieter Nuhn, SLAC / SSRLHeinz-Dieter Nuhn, SLAC / SSRL
Overview of Proposed Parameter ChangesOverview of Proposed Parameter Changes Nuhn@slac.stanford.eduNuhn@slac.stanford.edu
Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center
Special Initial Break LengthsSpecial Initial Break LengthsSpecial Initial Break LengthsSpecial Initial Break Lengths
Present design uses special values for the first three Present design uses special values for the first three break lengths: break lengths: 28.1 cm – 25.6 cm – 47. 3 cm 28.1 cm – 25.6 cm – 47. 3 cmcompared to the regular values of compared to the regular values of 18.7 cm – 18.7 cm – 42.1 cm 18.7 cm – 18.7 cm – 42.1 cm
Introduced by Nikolay Vinokurov to improve the overall Introduced by Nikolay Vinokurov to improve the overall FEL gain.FEL gain.
Estimate for new special lengths isEstimate for new special lengths is 46.6 cm – 45.0 cm – 59.0 cm 46.6 cm – 45.0 cm – 59.0 cm (74.1 cm) (74.1 cm)
New numbers will be checked by simulationNew numbers will be checked by simulationwith RON and other codes.with RON and other codes.
Present design uses special values for the first three Present design uses special values for the first three break lengths: break lengths: 28.1 cm – 25.6 cm – 47. 3 cm 28.1 cm – 25.6 cm – 47. 3 cmcompared to the regular values of compared to the regular values of 18.7 cm – 18.7 cm – 42.1 cm 18.7 cm – 18.7 cm – 42.1 cm
Introduced by Nikolay Vinokurov to improve the overall Introduced by Nikolay Vinokurov to improve the overall FEL gain.FEL gain.
Estimate for new special lengths isEstimate for new special lengths is 46.6 cm – 45.0 cm – 59.0 cm 46.6 cm – 45.0 cm – 59.0 cm (74.1 cm) (74.1 cm)
New numbers will be checked by simulationNew numbers will be checked by simulationwith RON and other codes.with RON and other codes.
Undulator Parameter Workshop, May 21-23, Undulator Parameter Workshop, May 21-23, 20032003
Heinz-Dieter Nuhn, SLAC / SSRLHeinz-Dieter Nuhn, SLAC / SSRL
Overview of Proposed Parameter ChangesOverview of Proposed Parameter Changes Nuhn@slac.stanford.eduNuhn@slac.stanford.edu
Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center
UNDULATOR
3410 446
11599 mm
Horizontal Steering Coil
Vertical Steering Coil
Beam Position Monitor
557
X-Ray Diagnostics
Quadrupoles
Undulator Schematic (Regular Section)Undulator Schematic (Regular Section)Undulator Schematic (Regular Section)Undulator Schematic (Regular Section)
127184 mmTotal Length
(708)
(11750 mm)
(128845 mm)
Undulator Parameter Workshop, May 21-23, Undulator Parameter Workshop, May 21-23, 20032003
Heinz-Dieter Nuhn, SLAC / SSRLHeinz-Dieter Nuhn, SLAC / SSRL
Overview of Proposed Parameter ChangesOverview of Proposed Parameter Changes Nuhn@slac.stanford.eduNuhn@slac.stanford.edu
Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center
Reduction in Focusing StrengthReduction in Focusing StrengthReduction in Focusing StrengthReduction in Focusing Strength
Present focusing lattice uses 5-cm-long permanent Present focusing lattice uses 5-cm-long permanent quadrupoles with gradient of 106 T/m quadrupoles with gradient of 106 T/m (< (<> = 18 m at 14.35 GeV)> = 18 m at 14.35 GeV)
New undulator parameters require reduced gradient.New undulator parameters require reduced gradient.
Gradient reduced to 60 T/mGradient reduced to 60 T/m (< (<> = 30 m at 14.04 GeV)> = 30 m at 14.04 GeV)
Transverse quadrupole displacement used for steeringTransverse quadrupole displacement used for steering
Reduced gradients require larger quadrupole Reduced gradients require larger quadrupole displacement for same kick angle.displacement for same kick angle.
Beam Based Alignment procedure has been checkedBeam Based Alignment procedure has been checked
Present focusing lattice uses 5-cm-long permanent Present focusing lattice uses 5-cm-long permanent quadrupoles with gradient of 106 T/m quadrupoles with gradient of 106 T/m (< (<> = 18 m at 14.35 GeV)> = 18 m at 14.35 GeV)
New undulator parameters require reduced gradient.New undulator parameters require reduced gradient.
Gradient reduced to 60 T/mGradient reduced to 60 T/m (< (<> = 30 m at 14.04 GeV)> = 30 m at 14.04 GeV)
Transverse quadrupole displacement used for steeringTransverse quadrupole displacement used for steering
Reduced gradients require larger quadrupole Reduced gradients require larger quadrupole displacement for same kick angle.displacement for same kick angle.
Beam Based Alignment procedure has been checkedBeam Based Alignment procedure has been checked
Undulator Parameter Workshop, May 21-23, Undulator Parameter Workshop, May 21-23, 20032003
Heinz-Dieter Nuhn, SLAC / SSRLHeinz-Dieter Nuhn, SLAC / SSRL
Overview of Proposed Parameter ChangesOverview of Proposed Parameter Changes Nuhn@slac.stanford.eduNuhn@slac.stanford.edu
Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center
FODO Lattice Energy LimitationsFODO Lattice Energy Limitations
1.5 Å1.5 Å15 Å15 Å
15 Å15 Å 1.5 Å1.5 Å 1 Å1 Å
Undulator Parameter Workshop, May 21-23, Undulator Parameter Workshop, May 21-23, 20032003
Heinz-Dieter Nuhn, SLAC / SSRLHeinz-Dieter Nuhn, SLAC / SSRL
Overview of Proposed Parameter ChangesOverview of Proposed Parameter Changes Nuhn@slac.stanford.eduNuhn@slac.stanford.edu
Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center
LCLS Operating Points for 1 nC Bunch Charge (Old)LCLS Operating Points for 1 nC Bunch Charge (Old)
LCLS Operating Point at LCLS Operating Point at 1.5 Å1.5 ÅLCLS Operating Point at LCLS Operating Point at 1.5 Å1.5 ÅLCLS Operating Point at LCLS Operating Point at 15 Å15 ÅLCLS Operating Point at LCLS Operating Point at 15 Å15 Å
Undulator Parameter Workshop, May 21-23, Undulator Parameter Workshop, May 21-23, 20032003
Heinz-Dieter Nuhn, SLAC / SSRLHeinz-Dieter Nuhn, SLAC / SSRL
Overview of Proposed Parameter ChangesOverview of Proposed Parameter Changes Nuhn@slac.stanford.eduNuhn@slac.stanford.edu
Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center
LCLS Operating Points for 1 nC Bunch Charge (New)LCLS Operating Points for 1 nC Bunch Charge (New)
LCLS Operating Point at LCLS Operating Point at 1.5 Å1.5 ÅLCLS Operating Point at LCLS Operating Point at 1.5 Å1.5 Å
Operating PointOperating Point Operating PointOperating Point
Undulator Parameter Workshop, May 21-23, Undulator Parameter Workshop, May 21-23, 20032003
Heinz-Dieter Nuhn, SLAC / SSRLHeinz-Dieter Nuhn, SLAC / SSRL
Overview of Proposed Parameter ChangesOverview of Proposed Parameter Changes Nuhn@slac.stanford.eduNuhn@slac.stanford.edu
Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center
LCLS Operating Points for 1 nC Bunch Charge (New)LCLS Operating Points for 1 nC Bunch Charge (New)
LCLS Operating Point at LCLS Operating Point at 15 Å15 ÅLCLS Operating Point at LCLS Operating Point at 15 Å15 Å
Operating PointOperating Point
Operating PointOperating PointOperating PointOperating Point
Undulator Parameter Workshop, May 21-23, Undulator Parameter Workshop, May 21-23, 20032003
Heinz-Dieter Nuhn, SLAC / SSRLHeinz-Dieter Nuhn, SLAC / SSRL
Overview of Proposed Parameter ChangesOverview of Proposed Parameter Changes Nuhn@slac.stanford.eduNuhn@slac.stanford.edu
Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center
LCLS Operating Points for 1 nC Bunch Charge (New)LCLS Operating Points for 1 nC Bunch Charge (New)
LCLS Operating Point at LCLS Operating Point at 1.0 Å1.0 ÅLCLS Operating Point at LCLS Operating Point at 1.0 Å1.0 Å
Operating PointOperating Point Operating PointOperating Point
Undulator Parameter Workshop, May 21-23, Undulator Parameter Workshop, May 21-23, 20032003
Heinz-Dieter Nuhn, SLAC / SSRLHeinz-Dieter Nuhn, SLAC / SSRL
Overview of Proposed Parameter ChangesOverview of Proposed Parameter Changes Nuhn@slac.stanford.eduNuhn@slac.stanford.edu
Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center
OLD NEWUndulator Type planar hybrid planar hybridMagnet Material NdFeB NdFeBWiggle Plane horizontal horizontalGap 6 8.2
mmPeriod Length 3.0 3.0
cmPeak On-Axis Field 1.325 1.014 TK 3.71 2.84
Module Length 3.41 3.41 mNumber of Modules 33 33Initial Break Lengths 0.281,0.256,0.473 0.466,0.450,0.590 mRegular Break Lengths 0.187-0.421 0.406-0.557 mUndulator Magnet Length 112.5 112.5 mUndulator Device Length (incl. Breaks) 121.1 127.2 mUndulator Filling Factor 93 88 %
OLD NEWUndulator Type planar hybrid planar hybridMagnet Material NdFeB NdFeBWiggle Plane horizontal horizontalGap 6 8.2
mmPeriod Length 3.0 3.0
cmPeak On-Axis Field 1.325 1.014 TK 3.71 2.84
Module Length 3.41 3.41 mNumber of Modules 33 33Initial Break Lengths 0.281,0.256,0.473 0.466,0.450,0.590 mRegular Break Lengths 0.187-0.421 0.406-0.557 mUndulator Magnet Length 112.5 112.5 mUndulator Device Length (incl. Breaks) 121.1 127.2 mUndulator Filling Factor 93 88 %
Summary of Nominal Undulator Design ChangesSummary of Nominal Undulator Design Changes
Undulator Parameter Workshop, May 21-23, Undulator Parameter Workshop, May 21-23, 20032003
Heinz-Dieter Nuhn, SLAC / SSRLHeinz-Dieter Nuhn, SLAC / SSRL
Overview of Proposed Parameter ChangesOverview of Proposed Parameter Changes Nuhn@slac.stanford.eduNuhn@slac.stanford.edu
Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center
OLD NEW
Lattice Type FODO FODOMagnet Type permanent permanentNominal Magnet Length 5 5 cmQF Gradient 107 61 T/mQD Gradient -106 -60 T/mAverage Function at 1.5 Å 18.0 24.5 mLowest Usable Energy 3.17 1.84 GeV
OLD NEW
Lattice Type FODO FODOMagnet Type permanent permanentNominal Magnet Length 5 5 cmQF Gradient 107 61 T/mQD Gradient -106 -60 T/mAverage Function at 1.5 Å 18.0 24.5 mLowest Usable Energy 3.17 1.84 GeV
Summary of Nominal Focusing Lattice ChangesSummary of Nominal Focusing Lattice Changes
Undulator Parameter Workshop, May 21-23, Undulator Parameter Workshop, May 21-23, 20032003
Heinz-Dieter Nuhn, SLAC / SSRLHeinz-Dieter Nuhn, SLAC / SSRL
Overview of Proposed Parameter ChangesOverview of Proposed Parameter Changes Nuhn@slac.stanford.eduNuhn@slac.stanford.edu
Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center
At 1.0 Å OLD NEW
Electron Beam Energy - 14.04 GeV - 27483<> - 30
mRms beam radius - 36 m
At 1.0 Å OLD NEW
Electron Beam Energy - 14.04 GeV - 27483<> - 30
mRms beam radius - 36 m
Summary of Electron Beam ParametersSummary of Electron Beam Parameters
At 15 Å OLD NEW
Electron Beam Energy 4.45 3.64 GeV 8880 7096<> 7.3 8.9
mRms beam radius 35 39 m
At 15 Å OLD NEW
Electron Beam Energy 4.45 3.64 GeV 8880 7096<> 7.3 8.9
mRms beam radius 35 39 m
At 1.5 Å OLD NEW
Electron Beam Energy 14.35 11.47 GeV 28082 22439<> 18.0 24.4
mRms beam radius 28 36 m
At 1.5 Å OLD NEW
Electron Beam Energy 14.35 11.47 GeV 28082 22439<> 18.0 24.4
mRms beam radius 28 36 m
Undulator Parameter Workshop, May 21-23, Undulator Parameter Workshop, May 21-23, 20032003
Heinz-Dieter Nuhn, SLAC / SSRLHeinz-Dieter Nuhn, SLAC / SSRL
Overview of Proposed Parameter ChangesOverview of Proposed Parameter Changes Nuhn@slac.stanford.eduNuhn@slac.stanford.edu
Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center
ConclusionsConclusions
New values have been proposed forNew values have been proposed forundulator gap, undulator gap, maximum electron beam energy, maximum electron beam energy, break length pattern, and break length pattern, and quadrupole gradientsquadrupole gradients
Benefits areBenefits aremore room for vacuum chambermore room for vacuum chambermore space for diagnostics components between undulator modulesmore space for diagnostics components between undulator modulesincrease of accessible wavelength rangeincrease of accessible wavelength range
Reduction in photon number can be more than compensated by tapering Reduction in photon number can be more than compensated by tapering using the new Field Adjuster Comb.using the new Field Adjuster Comb.
New values have been proposed forNew values have been proposed forundulator gap, undulator gap, maximum electron beam energy, maximum electron beam energy, break length pattern, and break length pattern, and quadrupole gradientsquadrupole gradients
Benefits areBenefits aremore room for vacuum chambermore room for vacuum chambermore space for diagnostics components between undulator modulesmore space for diagnostics components between undulator modulesincrease of accessible wavelength rangeincrease of accessible wavelength range
Reduction in photon number can be more than compensated by tapering Reduction in photon number can be more than compensated by tapering using the new Field Adjuster Comb.using the new Field Adjuster Comb.
Undulator Parameter Workshop, May 21-23, Undulator Parameter Workshop, May 21-23, 20032003
Heinz-Dieter Nuhn, SLAC / SSRLHeinz-Dieter Nuhn, SLAC / SSRL
Overview of Proposed Parameter ChangesOverview of Proposed Parameter Changes Nuhn@slac.stanford.eduNuhn@slac.stanford.edu
Linac Coherent Light Source Stanford Synchrotron Radiation LaboratoryStanford Linear Accelerator Center
End of Presentation
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