E. Bong, SLACLCLS FAC Meeting - April 29, 2004 Linac Overview E. Bong LCLS FAC Meeting April 29,...
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Transcript of E. Bong, SLACLCLS FAC Meeting - April 29, 2004 Linac Overview E. Bong LCLS FAC Meeting April 29,...
E. Bong, E. Bong, SLACSLAC LCLSLCLS FAC Meeting - April 29, 2004 FAC Meeting - April 29, 2004
Linac OverviewLinac OverviewE. BongE. Bong
LCLSLCLS FAC Meeting FAC Meeting April 29, 2004April 29, 2004
LCLSLCLS
E. Bong, E. Bong, SLACSLAC LCLSLCLS FAC Meeting - April 29, 2004 FAC Meeting - April 29, 2004
COST Report – WBS3 x FundFY FY FY FY FY
WBS DESCRIPTION 2004 2005 2006 2007 2008 TOTAL
1.3.1 System Management & Integration
PED Project Engineering 558 632 2 1192CON Project Construction 54 572 520 496 1642TOTAL 558 685 574 520 496 2833
1.3.2 Linac Controls & Power Conversion Subsyst
PED Project Engineering 1491 559 14 9 2073
CON Project Construction 71 4110 746 4927TOTAL 1562 4669 760 9 7000
1.3.3 Linac Magnets & Supports
PED Project Engineering 177 489 92 757
CON Project Construction 115 1054 983 22 2175TOTAL 292 1543 1075 22 2932
1.3.4 Linac Vacuum Subsystem
PED Project Engineering 60 125 241 13 440
CON Project Construction 1343 847 2190
TOTAL 60 125 1585 860 2630
1.3.5 Linac Electron Diagnostics
PED Project Engineering 297 289 4 590CON Project Construction 1330 220 1550TOTAL 297 1620 223 2140
1.3.6 Linac RF Subsystem
PED Project Engineering 109 271 146 7 532
CON Project Construction 1635 1203 200 3037TOTAL 109 1905 1350 206 3570
1.3.7 Linac Installation & Alignment
CON Project Construction 90 1663 2726 441 4920TOTAL 90 1663 2726 441 4920
E. Bong, E. Bong, SLACSLAC LCLSLCLS FAC Meeting - April 29, 2004 FAC Meeting - April 29, 2004
COST Report – WBS3 x FundFY FY FY FY FY
WBS DESCRIPTION 2004 2005 2006 2007 2008 TOTAL
2.3.2 Linac Controls & Power Conversion Subsyst
SPR Project Spares 97 97TOTAL 97 97
2.3.3 Linac Magnets & Supports
SPR Project Spares 129 18 147TOTAL 129 18 147
2.3.4 Linac Vacuum Subsystem
SPR Project Spares 72 72PRE Pre-Operations 73 73
TOTAL 145 145
2.3.5 Linac Electron Diagnostics
SPR Project Spares 225 4 230TOTAL 225 4 230
2.3.6 Linac RF Subsystem
SPR Project Spares 517 240 757TOTAL 517 240 757
2.3.7 Linac System Commissioning
PRE Pre-Operations 49 440 488
TOTAL 49 440 488
E. Bong, E. Bong, SLACSLAC LCLSLCLS FAC Meeting - April 29, 2004 FAC Meeting - April 29, 2004
LCLS Linac MilestonesACT TITLE ES / EF ACT TITLE ES / EF
MSC_LN005 CRIT: Start Procurement of X-Band Klystron 10/13/2004 MS3_LN025 Component Installation Completed - L03 9/28/2007
MSC_LN000 CRIT: Start Linac Cableplant Installation Procmt 7/13/2005 MS3_LN030 System Commissioning Completed - BC1 12/27/2007
MSB_090 Shutdown of FFTB Operations 6/1/2006 MS3_LN035 Component Installation Completed - LTU 12/27/2007
MS3_LN000 Component Installation Completed - L01 10/31/2006 MSB_155 Start BC2 Commissioning 1/31/2008
MS3_LN005 Component Installation Completed - BC1 10/31/2006 MS3_LN040 System Commissioning Completed - L02 4/30/2008
MSB_040 Front End Enclosure Beneficial Occupancy 4/12/2007 MS3_LN045 System Commissioning Completed - BC2 4/30/2008
MSB_077 First Beam on Linac Axis 6/29/2007 MSB_160 Start LTU Commissioning 5/1/2008
MSB_030 Beam Transport Hall Beneficial Occupancy 7/2/2007 MS3_LN052 First Beam into Undulator 5/30/2008
MSB_045 Beam Dump Beneficial Occupancy 7/2/2007 MS3_LN050 System Commissioning Completed - L03 5/30/2008
MSB_150 Start BC1 Commissioning 9/28/2007 MS3_LN055 Component Installation Completed - E-Dump 5/30/2008
MS3_LN010 System Commissioning Completed - L01 9/28/2007 MS3_LN060 System Commissioning Completed - LTU 7/31/2008
MS3_LN015 Component Installation Completed - L02 9/28/2007 MSB_170 Start Beam Dump Commissioning 8/1/2008
MS3_LN020 Component Installation Completed - BC2 9/28/2007 MS3_LN065 System Commissioning Completed - E-Dump 8/29/2008
Data from LCLS Project Manpower Loaded Schedule
E. Bong, E. Bong, SLACSLAC LCLSLCLS FAC Meeting - April 29, 2004 FAC Meeting - April 29, 2004
Nominal System Design
1.5-Å SASE FEL Linac:Requirements
Acceleration to 14.3 GeV (4.5 GeV min.)Bunch compression to 3.4 kA (x,y 1.2 m)Emittance preservation (<20% ‘slice’, <100% ‘projected’)Final energy spread (<0.02% ‘slice’, <0.1% ‘projected’)Minimal sensitivity to system ‘jitter’Diagnostics integrated into designFlexible operations (1.5 to 15 Å, low-charge, chirp, etc.)Compatibility with other SLAC programs
use 2 compressors, 3 linacsuse 2 compressors, 3 linacs
E. Bong, E. Bong, SLACSLAC LCLSLCLS FAC Meeting - April 29, 2004 FAC Meeting - April 29, 2004
Nominal Nominal LCLSLCLS Linac Parameters for 1.5- Linac Parameters for 1.5-Å FELÅ FEL
Single bunch, 1-nC charge, 1.2-Single bunch, 1-nC charge, 1.2-m m sliceslice emittance, 120-Hz repetition rate… emittance, 120-Hz repetition rate…
SLAC linac tunnelSLAC linac tunnel research yardresearch yard
Linac-1Linac-1L L 9 m9 m
rf rf 25°25°
Linac-2Linac-2L L 330 m330 mrf rf 41°41°
Linac-3Linac-3L L 550 m550 mrf rf 10°10°
BC-1BC-1L L 6 m6 m
RR5656 39 mm39 mm
BC-2BC-2L L 22 m22 m
RR5656 25 mm25 mm LTULTUL L =275 m=275 mRR56 56 0 0
DL-1DL-1L L 12 m12 mRR56 56 0 0
undulatorundulatorL L =130 m=130 m
135 MeV135 MeVz z 0.83 mm 0.83 mm 0.10 %0.10 %
250 MeV250 MeVz z 0.19 mm 0.19 mm 1.6 %1.6 %
4.54 GeV4.54 GeVz z 0.022 mm 0.022 mm 0.71 %0.71 %
14.1 GeV14.1 GeVz z 0.022 mm 0.022 mm 0.01 %0.01 %
SLAC linacSLAC linac
LCLS INJ
LCLS INJ
21-1b21-1b21-1d21-1d XX
Linac-Linac-XXL L =0.6 m=0.6 mrfrf= =
21-3b21-3b24-6d24-6d
25-1a25-1a30-8c30-8c
E. Bong, E. Bong, SLACSLAC LCLSLCLS FAC Meeting - April 29, 2004 FAC Meeting - April 29, 2004
LCLS Linac L1 Subsystem
Linac Sector 21-1Accelerates a single 1-nC, 10-ps long electron bunch, at a repetition rate of 120 Hz, from 135 MeV to 250 MeV. Introduces energy chirp to allow bunch compression in BC1. X-Band linearizes energy spread.
Transverse Slice Emittance Growth <4% both planesS-Band Phase -25° wrt crestX-Band Phase -160° wrt crestX-Band Decelerating Voltage -19Mv at crest
E. Bong, E. Bong, SLACSLAC LCLSLCLS FAC Meeting - April 29, 2004 FAC Meeting - April 29, 2004
LCLS Linac BC1 Subsystem
Parameter Description Symbol Value Unit
Initial to final electron energy E 250 MeV
Initial and final bunch length (rms) z 830 - 190 m
Active length of system L 6.3 m
Relative energy spread of e bunch (rms)
E /E 1.6 %
Bend angle of chicane dipoles |q B | 4.82 deg
Nominal |R 56| (and operational range) |R 56| 39 (15 to 65) mm
Length of chicane dipoles L B 20.32 cm
Linac Sector 21-2a to 21-3aCompresses a single 1-nC, 830-m long (rms) electron bunch, at a repetition rate of 120 Hz, at 250 MeV to an rms length of 190 m.
E. Bong, E. Bong, SLACSLAC LCLSLCLS FAC Meeting - April 29, 2004 FAC Meeting - April 29, 2004
LCLS Linac L2 Subsystem
Linac Sector 21-3b to 24-6d. Largely unmodified SLAC Linac.Accelerates a single 1-nC, 0.2-mm long electron bunch, at a repetition rate of 120 Hz, from 250 MeV to 4.5 GeV . Energy chirps the bunch to allow compression in BC2.
Parameter Description Symbol Value Unit
Initial to final electron energy E 0.25 to 4.54 GeV
Bunch length (rms) z 195 m
Active length of system L 329 m
Relative energy spread of e bunch (rms)
E /E 1.6 to 0.7 %
RF phase of S-band sections s
4 S-deg
S-band voltage at crest (not incl. ~15% overhead) DV 5.7 GV
S-band mean phase stability (rms) D 0.07 deg-S
S-band mean amplitude stability (rms) DV /V 0 0.1 %
E. Bong, E. Bong, SLACSLAC LCLSLCLS FAC Meeting - April 29, 2004 FAC Meeting - April 29, 2004
LCLS Linac BC2 Subsystem
Linac Sector 24-7a to 24-8d.compress a single 1-nC, 195-m long (rms) electron bunch, at a repetition rate of 120 Hz, at 4.54 GeV to an rms length of 22 m
Parameter Description Symbol Value Unit
Nominal electron energy E 4.54 GeV
Initial and final bunch length (rms) z 190 - 22 m
Active length of system L 22.5 m
Relative energy spread of e bunch (rms)
E /E 0.7 %
Bend angle of each chicane dipole |q B | 1.98 deg
Nominal |R 56| (and operational range) |R 56| 25 (10 to 50) mm
Length of chicane dipoles L B 50 cm
E. Bong, E. Bong, SLACSLAC LCLSLCLS FAC Meeting - April 29, 2004 FAC Meeting - April 29, 2004
LCLS Linac L3 Subsystem
Linac Sector 25 to 30. Largely unmodified SLAC Linac.
E. Bong, E. Bong, SLACSLAC LCLSLCLS FAC Meeting - April 29, 2004 FAC Meeting - April 29, 2004
LCLS Linac L3 Subsystem
Linac Sector 25 to 30. Largely unmodified SLAC Linac.Accelerates a single 1-nC, 0.02-mm long electron bunch, at a repetition rate of 120 Hz, from 4.5 GeV to 14.3 GeV .
Parameter Description Symbol Value Unit
Initial to final electron energy E 4.54 to 14 GeV
Bunch length (rms) z 22 m
Active length of system L 553 m
Relative energy spread of e bunch (rms)
E /E 0.7 to 0.01 %
RF phase of S-band sections s
10 or 0 S-deg
S-band voltage at crest (not incl. ~15% overhead) DV 9.9 GV
S-band mean phase stability (rms) D 0.15 deg-S
S-band mean amplitude stability (rms) DV /V 0 0.08 %
E. Bong, E. Bong, SLACSLAC LCLSLCLS FAC Meeting - April 29, 2004 FAC Meeting - April 29, 2004
LCLS Linac LTU Subsystem Schematic
E. Bong, E. Bong, SLACSLAC LCLSLCLS FAC Meeting - April 29, 2004 FAC Meeting - April 29, 2004
LCLS Linac LTU Subsystem
Parameter Description Symbol Value Unit
Electron energy range E 4.5 to 14 GeV
Bunch length (rms) z 22 m
Active length of system L 342 m
Relative energy spread of e bunch (rms)
E /E 0.01 %
Bend angle of each of 4 horizontal dipoles |q B | 0.5 deg
Bend angle of each of 2 vertical dipoles |q y | 2.3 mrad
New Beamline extending from FFTB muon plug wall in SLAC BSY, across research yard in new housing to FEL undulator.Transports a 1-nC, 20-m long (rms) electron bunch, at a repetition rate of 120 Hz, at 14 GeV to the LCLS FEL undulator.Includes energy and emittance diagnostics, energy collimation, bunch length diagnostics and undulator launch feedback.
E. Bong, E. Bong, SLACSLAC LCLSLCLS FAC Meeting - April 29, 2004 FAC Meeting - April 29, 2004
LCLS Linac E-Dump Subsystem
New Beamline located between exit of Undulator and Near Experimental Hall in new underground housing.Separates electron beam from X-Ray FEL beam directs beam to dump.Includes energy and energy spread measurement capability to 10-4
E. Bong, E. Bong, SLACSLAC LCLSLCLS FAC Meeting - April 29, 2004 FAC Meeting - April 29, 2004
LCLS Linac X-Band SubsystemX-Band located in L1 just up-stream of BC1 bunch compressor.Linearizes energy gradient prior to bunch compression to minimize CSR instability.1 x XL-4 klystron feeding 1 NLC-type accelerating structure.
ParameterLCLS
(Nom)
NLCTA
(Nom)Units
Structure Length 60 60 cm
Structure Voltage 19 30 MV
Phase -160 - deg
Klystron Power 21 50 MW
Repetition Rate 120 60 Hz
Duty Cycle 0.1 1.6 s
E. Bong, E. Bong, SLACSLAC LCLSLCLS FAC Meeting - April 29, 2004 FAC Meeting - April 29, 2004
LCLS Linac ChallengesRF Stability (See R. Akre talk)
Existing system phase and amplitude stable to requirements over several seconds.Require bunch length and energy feedback to meet requirements over longer time scales.
Bunch Length Measurement & Feedback (See P. Krejcik talk)Bunch length measurement in R&D at SPPS.
Epics/SLAC Controls System Compatibility (See Controls breakout talks)Require Epics system to access SLC control system in order to operate existing equipment required for LCLS.SLC control system needs to access EPICS system to operate LCLS upgraded equipment required in high power beam operations.
Articulated Bunch Compressors (See P. Emma talk)Articulation required for R56 tuning for full range of beam charge.Simplification of LUTL bend chamber design to reduce design challenge.
BPM Module Design (See P. Krejcik talk)Measurement of full range of beam charge required.Two beam e+ e- beam operations place additional challenge on module design.
E. Bong, E. Bong, SLACSLAC LCLSLCLS FAC Meeting - April 29, 2004 FAC Meeting - April 29, 2004
LCLS/SLAC Program Compatibility
Program Changeover Time15 minutes from LCLS to damped SLAC beam.24 hours from LCLS to undamped ESA beam.
Moving ChicanesArticulates collinear with linac axis for straight-ahead.
X-Band Structure Aperture7mm, smaller than linac scrapers (16.5mm)Smaller than undamped beam.Moves off-axis, temporary pipe installed.
BPM Module DesignCharge Range. LCLS 0.2nC to 1nC. ESA ???Two Beam e- e+ Running.
E. Bong, E. Bong, SLACSLAC LCLSLCLS FAC Meeting - April 29, 2004 FAC Meeting - April 29, 2004
Multiple Undulator ExpansionMultiple Undulator Expansion
E. Bong, E. Bong, SLACSLAC LCLSLCLS FAC Meeting - April 29, 2004 FAC Meeting - April 29, 2004
LCLS Linac System SummaryLCLS Linac System Summary
Layout and initial design of system underway.Layout and initial design of system underway.
Expertise on site for design and execution of Expertise on site for design and execution of modifications to existing SLAC Linac and modifications to existing SLAC Linac and construction of new beamlines.construction of new beamlines.
Simplification of LEUTL chicane and experience Simplification of LEUTL chicane and experience with SPPS chicane to be applied to LCLS Chicane.with SPPS chicane to be applied to LCLS Chicane.
BPM module design challenging.BPM module design challenging.
RF stability looks achievable.RF stability looks achievable.
Bunch length measurement required for RF Bunch length measurement required for RF feedback in R&D phase.feedback in R&D phase.