Linac overview e bong lcls fac meeting april 29 2004
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Linac Overview E. Bong LCLS FAC Meeting April 29, 2004. LCLS. COST Report – WBS3 x Fund. COST Report – WBS3 x Fund. LCLS Linac Milestones. 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.)

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Linac overview e bong lcls fac meeting april 29 2004

Linac OverviewE. BongLCLS FAC Meeting April 29, 2004

LCLS

LCLS FAC Meeting - April 29, 2004


Cost report wbs3 x fund
COST Report – WBS3 x Fund

LCLS FAC Meeting - April 29, 2004


Cost report wbs3 x fund1
COST Report – WBS3 x Fund

LCLS FAC Meeting - April 29, 2004


Lcls linac milestones
LCLS Linac Milestones

Data from LCLS Project Manpower Loaded Schedule

LCLS FAC Meeting - April 29, 2004


Nominal system design
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 (gex,y 1.2 mm)

    • Emittance preservation (<20% ‘slice’, <100% ‘projected’)

    • Final energy spread (<0.02% ‘slice’, <0.1% ‘projected’)

    • Minimal sensitivity to system ‘jitter’

    • Diagnostics integrated into design

    • Flexible operations (1.5 to 15 Å, low-charge, chirp, etc.)

    • Compatibility with other SLAC programs

use 2 compressors, 3 linacs

LCLS FAC Meeting - April 29, 2004


Nominal lcls linac parameters for 1 5 fel
Nominal LCLS Linac Parameters for 1.5-Å FEL

Single bunch, 1-nC charge, 1.2-mm slice emittance, 120-Hz repetition rate…

250 MeV

z  0.19 mm

  1.6 %

14.1 GeV

z  0.022 mm

  0.01 %

135 MeV

z  0.83 mm

  0.10 %

Linac-X

L =0.6 m

rf= -160

4.54 GeV

z  0.022 mm

  0.71 %

LCLS INJ

Linac-1

L 9 m

rf  -25°

Linac-2

L 330 m

rf  -41°

Linac-3

L 550 m

rf  -10°

undulator

L =130 m

21-1b

21-1d

21-3b

24-6d

25-1a

30-8c

X

SLAC linac

BC-1

L 6 m

R56 -39 mm

BC-2

L 22 m

R56 -25 mm

DL-1

L 12 m

R56 0

LTU

L =275 m

R56  0

research yard

SLAC linac tunnel

LCLS FAC Meeting - April 29, 2004

(RF phase: frf= 0 is at accelerating crest)


Lcls linac l1 subsystem
LCLS Linac L1 Subsystem

  • Linac Sector 21-1

  • Accelerates 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.

LCLS FAC Meeting - April 29, 2004


Lcls linac bc1 subsystem

Linac Sector 21-2a to 21-3a

Compresses a single 1-nC, 830-mm long (rms) electron bunch, at a repetition rate of 120 Hz, at 250 MeV to an rms length of 190 mm.

LCLS Linac BC1 Subsystem

LCLS 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.

LCLS Linac L2 Subsystem

LCLS FAC Meeting - April 29, 2004


Lcls linac bc2 subsystem

Linac Sector 24-7a to 24-8d.

compress a single 1-nC, 195-mm long (rms) electron bunch, at a repetition rate of 120 Hz, at 4.54 GeV to an rms length of 22 mm

LCLS Linac BC2 Subsystem

LCLS FAC Meeting - April 29, 2004


Lcls linac l3 subsystem

Linac Sector 25 to 30. Largely unmodified SLAC Linac.

LCLS Linac L3 Subsystem

LCLS FAC Meeting - April 29, 2004


Lcls linac l3 subsystem1

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 .

LCLS Linac L3 Subsystem

LCLS FAC Meeting - April 29, 2004


Lcls linac ltu subsystem schematic
LCLS Linac LTU Subsystem Schematic

LCLS FAC Meeting - April 29, 2004


Lcls linac ltu subsystem

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-mm 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 LTU Subsystem

LCLS 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

LCLS Linac E-Dump Subsystem

LCLS FAC Meeting - April 29, 2004


Lcls linac x band subsystem
LCLS Linac X-Band Subsystem Experimental Hall in new underground housing.

  • X-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.

LCLS FAC Meeting - April 29, 2004


Lcls linac challenges
LCLS Linac Challenges Experimental Hall in new underground housing.

  • RF 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 FAC Meeting - April 29, 2004


Lcls slac program compatibility
LCLS/SLAC Program Compatibility Experimental Hall in new underground housing.

  • Program Changeover Time

    • 15 minutes from LCLS to damped SLAC beam.

    • 24 hours from LCLS to undamped ESA beam.

  • Moving Chicanes

    • Articulates collinear with linac axis for straight-ahead.

  • X-Band Structure Aperture

    • 7mm, smaller than linac scrapers (16.5mm)

    • Smaller than undamped beam.

    • Moves off-axis, temporary pipe installed.

  • BPM Module Design

    • Charge Range. LCLS 0.2nC to 1nC. ESA ???

    • Two Beam e- e+ Running.

LCLS FAC Meeting - April 29, 2004


Multiple undulator expansion
Multiple Undulator Expansion Experimental Hall in new underground housing.

LCLS FAC Meeting - April 29, 2004


Lcls linac system summary
LCLS Linac System Summary Experimental Hall in new underground housing.

  • Layout and initial design of system underway.

  • Expertise on site for design and execution of modifications to existing SLAC Linac and construction of new beamlines.

  • Simplification of LEUTL chicane and experience with SPPS chicane to be applied to LCLS Chicane.

  • BPM module design challenging.

  • RF stability looks achievable.

  • Bunch length measurement required for RF feedback in R&D phase.

LCLS FAC Meeting - April 29, 2004