E. Bong, SLACLCLS FAC Meeting - April 29, 2004 Linac Overview E. Bong LCLS FAC Meeting April 29, 2004 LCLS

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


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


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


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


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


2.3.6 Linac RF Subsystem


2.3.7 Linac System Commissioning

PRE Pre-Operations 49 440 488

TOTAL 49 440 488


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


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


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


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


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.



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.


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


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 %


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


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


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



Linac Sector 25 to 30. Largely unmodified SLAC Linac.



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 .


Initial to final electron energy E 4.54 to 14 GeV




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 %


LCLS Linac LTU Subsystem Schematic


LCLS Linac LTU Subsystem


Electron energy range E 4.5 to 14 GeV




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.


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


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


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.


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.


Multiple Undulator ExpansionMultiple Undulator Expansion


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.

Documents

E. Bong, SLACLCLS FAC Meeting - April 29, 2004 Linac Overview E. Bong LCLS FAC Meeting April 29, 2004 LCLS