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Near term opportunities for LCLS 'upgrades' . ge x,y = 0.4 m m (slice) I pk = 3.0 kA s E / E = 0.01% (slice). Recent Results! (25 of 33 undulators installed). J. Hastings for the LCLS Experimental Facilities Division June 25, 2009. Goals. Increase user access Multiplex options

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near term opportunities for lcls upgrades

Near term opportunities for LCLS 'upgrades'

gex,y = 0.4 mm (slice)

Ipk = 3.0 kA

sE/E = 0.01% (slice)

Recent Results!

(25 of 33 undulators installed)

J. Hastings for the LCLS

Experimental Facilities DivisionJune 25, 2009

goals
Goals
  • Increase user access
    • Multiplex options
      • Soft x-rays (800-2000eV) - AMO, SXR
      • Hard x-rays (up to 25 keV) – XPP, XCS, CXI, MEC
  • Performance enhancements
    • Energy range
      • Long wavelength
      • Short wavelength
    • Polarization
    • Pulse duration
    • Laser-electron beam interactions
slide4

CXI

X-ray transport tunnel

XCS

XPP

MEC

SXR

XCS Offset Monochromator

AMO

slide5

AMO, SXR, XPP, XCS, CXI, MEC

Soft X-ray mirrors

AMO

SXR

Hard X-ray mirrors

Large offset

monchromator

Instrument layout

soft x ray experiments at lcls
Soft X-ray experiments at LCLS

Soft X-Ray Offset mirror system

Typical AMO experiments are dilute samples: put re-focusing optics behind AMO: run

two experiments in ‘parallel’

(500) 800 eV – 2 keV

Beam sharing in place on a ‘12 hour basis’ (mirror deflection between AMO and SXR)

xcs large offset monochromator
XCS Large Offset Monochromator

Troika, ID10B, ESRF

Kohzu, BL24XU, Spring-8

LUSI Concept

slide10

Baseline:

  • K = 3.5
  • = 3.0 cm
  • = 8415 (4.3 GeV)

1=1.5 nm

  • Long wavelength ‘limit’:
  • K = 3.5
  • = 3.0 cm
  • = 5870 (3.0 GeV)

1=3.1 nm

lu

lu

Long wavelength limit

slide11

Si (111)

0.75-Å

1.5-Å

2nd Harmonic Afterburner

Increase hard x-ray energy reach

1.5-Å LCLS Undulator

afterburner

130 m

43 m

0.75-Å radiation using “spent” LCLS beam, and completely parasitic to LCLS operation at 1.5 Å.

Add 40-m, 2nd-harmonic tapered undulator

SLAC-PUB-10694.

0.75-Å

Parameters:

Z. Huang, S. Reiche

polarization control by crossed undulator
Polarization Control by Crossed Undulator
  • Horizontal + vertical undulators or two helical undulators
  • Polarization controlled by phase shifter, fast switch possible with pulsed dipoles at ~100 Hz

-π/2

π/4

-π/4

0

Ex +

Ey

Phase shifter

π

5π/4

π/2

π/2

  • Studies show that equal power in x & y requires L2 = 1.3LG
  • Over 80% polarization is expected at SASE saturation
  • Second undulator can be adjusted as a second-harmonic afterburner if needed

K.-J. Kim, NIMA 2000

Y. Ding & Z. Huang,PRST-AB 2008

slide15

Thin slotted foil in center of chicane

coulomb scattered e-

e-

unspoiled e-

coulomb scattered e-

15-mm thick Be foil

PRL92, 074801 (2004).

y

P. Emma, M. Cornacchia, K. Bane, Z. Huang, H. Schlarb, G. Stupakov, D. Walz (SLAC)

2Dx

x DE/E  t

slide16

2 fs fwhm

z 60 m

Genesis 1.3 FEL code

~1010 photons

x-ray Power

(<1 fs possible)

Power (GW)

slide17

SIMULATED FEL PULSES

Y. Ding

Z. Huang

1.5 Å,

3.61011 photons

Ipk = 4.8 kA

ge 0.4 µm

Simulation at 1.5 Å based on measured injector & linac beam & Elegant tracking,with CSR, at 20 pC.

Y. Ding

Z. Huang

15 Å,

2.41011 photons,

Ipk = 2.6 kA,

ge 0.4 µm

20 pC tested

J. Frisch

1.2 fs

time-slicing at 20 pC

Simulation at 15 Å based on measured injector & linac beam & Elegant tracking,with CSR & 20 pC.

Measurements and Simulations:20-pC Bunch, 14 GeV

MEASURED SLICE EMITTANCE

135 MeV

20 pC

gex = 0.14 µm

accepted in PRL

power profile at 25 m
Power profile at 25 m

Average photon number: 2.4x1011

Estimated time-bandwidth product ~ 3 times Fourier-transform limit.

slide19

30 fs

Two-Stage SASE FEL

Self-seeding

Short pulse, or narrow bandwidth, & wavelength is more stable

Moderate – new undulator line or upgrade

SLAC-PUB-9370,

TESLA-FEL-97-06E,

SLAC-PUB-9633,

SLAC-PUB-10310

30

Parameters:

C. Pellegrini

measuring bunch arrival time jitter with an rf deflector
Measuring Bunch Arrival Time Jitter with an RF Deflector

V(t)

BPM Y Position (mm)

TCAV OFF

TCAV ON

9 mm rms

110 mm rms

Dt±0.6 ps

e-

S-band (2856 MHz)

y-BPM

slope = -2.34 mm/deg

Now measure BPM jitter with deflector OFF, and then ON (at constant phase)

Timing Jitter = (110 mm)/(2.34 mm/deg) = 0.047 deg  46 fsec rms

slide22

short pulse train

800-nm modulation (few GW)

24 kA

15-25 kA

peak current enhanced x7

70 as

Peak current

z /lL

SASE FEL

4 GeV

14 GeV

Allows synchronization between laser pulse and x-ray pulse

E-SASE(applied to LCLS)

A. Zholents PRL

slide23

ESASE in the LCLS

Chicane buncher

R56 = 0.3-0.8 mm

10-GW laser

L = 0.8-2.2 m

wiggler ~3 m

10-period

4.54 GeV

z 0.02 mm

rf

gun

rf

gun

Linac-1

L  9 m

rf -25°

Linac-2

L  330 m

rf  -41°

Linac-3

L  550 m

rf  -10°

13.6 GeV

new

Linac-0

L 6 m

Linac-1

BC1

Linac-2

BC2

Linac-3

Linac-0

undulator

L 130 m

undulator

L 130 m

X

X

…existing linac

…existing linac

BC1

R5639 mm

BC2

R5625 mm

DL2

Laser Heater

Laser

Heater

DL2

R560

DL1

R56-6 mm

SLAC linac tunnel

undulator hall

New elements

esase single spike selection
ESASE single spike selection
  • Two ten-cycle lasers (second laser tunable wavelength with OPA)
  • Tapered undulator to compensate LSC and enhance contrast

E (MeV)

P(GW)

Ding, Huang, Ratner, Bucksbaum, Merdji, FEL2008

slide25

Special Thanks to:

Y. Ding, P. Emma, J. Frisch,Z. Huang, H. Loos, A. Zholents, J. Wu ……