The LCLS LCLS X X- -Ray FEL and Ray FEL and The Related R&D - - PowerPoint PPT Presentation

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The LCLS LCLS X X- -Ray FEL and Ray FEL and The Related R&D at the SPPS Related R&D at the SPPS TJNAF TJNAF January 30, 2004 January 30, 2004 P. Emma, SLAC P. Emma, SLAC Sub- -Picosecond Pulse Source Picosecond Pulse Source

slide-1
SLIDE 1

The The LCLS LCLS X X-

  • Ray FEL and

Ray FEL and Related R&D at the Related R&D at the SPPS SPPS

TJNAF TJNAF

January 30, 2004 January 30, 2004

  • P. Emma,
  • P. Emma, SLAC

SLAC

Sub-Picosecond Pulse Source Sub Sub-

  • Picosecond Pulse Source

Picosecond Pulse Source

slide-2
SLIDE 2

Linac Coherent Light Source ( Linac Coherent Light Source (LCLS LCLS) )

  • 14

14-

  • GeV electrons

GeV electrons

  • 1.2

1.2-

  • µ

µm emittance m emittance

  • 200

200-

  • fsec FWHM pulse

fsec FWHM pulse

  • 2

2× ×10 1033

33 peak brightness

peak brightness*

* * photons/sec/mm * photons/sec/mm2

2/mrad

/mrad2

2/0.1%

/0.1%-

  • BW

BW

new bunch compressors new bunch compressors new bunch compressors 120-m undulator in research yard 120 120-

  • m undulator in research yard

m undulator in research yard new RF-gun at 2-km point new RF new RF-

  • gun at 2

gun at 2-

  • km point

km point SASE radiation at 1.5 Å SASE radiation at 1.5 Å SASE radiation at 1.5 Å

4 4th

th-

  • Generation

Generation X X-

  • ray SASE

ray SASE FEL Based on FEL Based on SLAC SLAC Linac Linac

slide-3
SLIDE 3

Linac Coherent Light Source

Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center

LCLS - Estimated Cost, Schedule LCLS LCLS -

  • Estimated Cost, Schedule

Estimated Cost, Schedule

$220M-$260M Total Estimated Cost range $265M-$315M Total Project Cost range

FY2005 Long-lead purchases for injector, undulator FY2006 Construction begins FY2007 FEL Commissioning begins September 2008 Construction complete – operations begins

  • J. Galayda
  • J. Galayda

2002 2002 2003 2003 2004 2004 2005 2005 2006 2006 FY2008 FY2008 FY2009 FY2009

Construction

Operation Operation

FY2001 FY2001 FY2002 FY2002 FY2003 FY2003 FY2004 FY2004 FY2005 FY2005 FY2006 FY2006 FY2007 FY2007

CD CD-

  • 1

1 CD CD-

  • 2a

2a CD CD-

  • 2b

2b CD CD-

  • 3a

3a CD CD-

  • 3b

3b CD CD-

Title I Title I Design Design Complete Complete XFEL XFEL Commissioning Commissioning

CD CD-

  • 4

4

slide-4
SLIDE 4

LCLS – Current Layout and Future Expansion Capacity LCLS LCLS – – Current Layout and Future Expansion Capacity Current Layout and Future Expansion Capacity

Transport Transport Undulator Undulator Hall A Hall A Tunnel Tunnel Hall B Hall B 3 Beams/mirror 3 Beams/mirror Expansion Expansion

  • J. Galayda
  • J. Galayda
slide-5
SLIDE 5

Coulomb Explosion of Lysozyme (50 fs) Coulomb Explosion of Lysozyme (50 fs)

  • J. Hajdu
  • J. Hajdu

Atomic and Atomic and molecular molecular dynamics occur dynamics occur at the at the fsec fsec-

  • scale

scale

slide-6
SLIDE 6

Exploit Exploit Position Position-

  • Time

Time Correlation on Correlation on e

e−

− bunch at Chicane Center

bunch at Chicane Center 0.1 mm (300 fs) rms 0.1 mm (300 fs) rms Access to Access to time time coordinate coordinate along bunch along bunch 2.6 mm rms 2.6 mm rms x x, horizontal pos. (mm)

, horizontal pos. (mm)

z z, longitudinal position (mm)

, longitudinal position (mm) 50 50 µ µm m

LCLS LCLS BC2 bunch compressor chicane BC2 bunch compressor chicane (similar in other machines) (similar in other machines)

slide-7
SLIDE 7

Add thin slotted foil in center of chicane Add thin slotted foil in center of chicane

2∆ 2∆x x y y e e−

−

x x ∝ ∝ ∆ ∆E E/ /E E ∝ ∝ t t

coulomb coulomb scattered scattered e e−

−

unspoiled unspoiled e e−

−

coulomb coulomb scattered scattered e e−

−

15 15-

  • µ

µm thick Be foil m thick Be foil

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

Stupakov, D. Walz, PRL PRL

slide-8
SLIDE 8

Track 200k macro Track 200k macro-

  • particles through entire

particles through entire LCLS LCLS up to 14.3 GeV up to 14.3 GeV 200 fs 200 fs

∆ ∆E E/ /E E

slide-9
SLIDE 9

2 fs fwhm 2 fs fwhm

z z ≈ ≈ 60 m 60 m x x-

  • ray

ray Power Power

Power (GW) Power (GW)

Genesis 1.3 Genesis 1.3 FEL code FEL code

slide-10
SLIDE 10

Saldin, Schneidmiller, Yurkov Saldin, Saldin, Schneidmiller, Schneidmiller, Yurkov Yurkov

FEL instability needs very “ FEL instability needs very “cold cold” ” e

e−

− beams (small

beams (small ε ε and and E E-

  • spread)

spread) Such a cold beam is subject to other “undesirable” instabilities Such a cold beam is subject to other “undesirable” instabilities in the in the accelerator ( accelerator (CSR CSR, Longitudinal Space , Longitudinal Space-

  • Charge=

Charge=LSC LSC, wakefields) , wakefields)

Micro Micro-

  • Bunching Instabilities

Bunching Instabilities

LCLS LCLS simulations simulations (M. Borland) (M. Borland)

t t

current modulation current modulation

1% 1% 10% 10% Gain=10 Gain=10 Z(k)

slide-11
SLIDE 11

How cold is the photo How cold is the photo-

  • injector beam?

injector beam?

Parmela Simulation Parmela Simulation TTF measurement TTF measurement simulation simulation measured measured ∆ ∆E E/ /E E 3 keV 3 keV ∆ ∆t t (sec) (sec)

  • H. Schlarb, M. Huening
  • H. Schlarb, M. Huening

3 keV, accelerated to 14 GeV, and compressed 3 keV, accelerated to 14 GeV, and compressed × ×36 36 ⇒ ⇒ 3/14 3/14× ×10 106

6×

×36 < 36 < 1 1× ×10 10−

−5 5

Too small to be useful in FEL (no effect on FEL gain when < Too small to be useful in FEL (no effect on FEL gain when <1 1× ×10 10−

−4 4)

)

slide-12
SLIDE 12

Laser Heater for Landau Damping Laser Heater for Landau Damping

2 cm 2 cm 10 cm 10 cm 10 cm 10 cm 50 cm 50 cm ~120 cm ~120 cm θ θ ≈ ≈ 5.7 5.7º º 10 per. undulator 10 per. undulator 800 nm, 1.2 MW 800 nm, 1.2 MW

Laser Laser-

  • electron interaction in undulator induces energy

electron interaction in undulator induces energy modulation (at 800 nm) modulation (at 800 nm) ⇒ ⇒ 40 keV rms 40 keV rms Inside weak chicane for laser access and time Inside weak chicane for laser access and time-

  • coordinate

coordinate smearing (Emittance growth negligible) smearing (Emittance growth negligible)

  • Z. Huang, M. Borland (ANL), P. Emma, J. Wu,
  • Z. Huang, M. Borland (ANL), P. Emma, J. Wu, R. Carr,
  • R. Carr, C. Limborg, G. Stupakov, J. Welch
  • C. Limborg, G. Stupakov, J. Welch
slide-13
SLIDE 13

laser spot much bigger than laser spot much bigger than e

e−

− spot

laser spot similar to laser spot similar to e

e−

− spot

spot spot

P P0

0 = 1.2 MW

= 1.2 MW w w0

0 = 350

= 350 µ µm m matched spot matched spot σ σx

x, ,y y ≈

≈ 200 200 µ µm m P P0

0 = 37 MW

= 37 MW w w0

0 ≈

≈ 3 mm 3 mm large laser spot large laser spot σ σx

x, ,y y ≈

≈ 200 200 µ µm m +60 keV +60 keV − −60 keV 60 keV

In Chicane In Chicane In Chicane

800 800 nm nm

800 800-

  • nm structure then gets smeared by chicane:

nm structure then gets smeared by chicane: ∆ ∆σ σz

z ≈

≈ 〈 〈x x' '2

2〉

〉1/2

1/2 |

|η ηx

x|

| >> >>

  • 50

50

0mc2 keV

0.005 0.01 0.015 V keV

1

40 keV rms 40 keV rms small spot small spot large spot large spot

slide-14
SLIDE 14

The GOOD The GOOD ( (w w0

0 = 350

= 350 µ µm, m, P P0

0 = 1.2 MW),

= 1.2 MW), and and the UGLY (no heater) the UGLY (no heater) the BAD the BAD ( ( w w0

0 = 3 mm,

= 3 mm, P P0

0 = 37 MW),

= 37 MW), small spot small spot double double-

  • horn

horn no heater no heater

Final long. phase Final long. phase space at 14 GeV for space at 14 GeV for initial 15 initial 15-

  • µ

µm, 1% seed

m, 1% seed

slide-15
SLIDE 15

−40 −20 20 40 2 4 6 8 10 12 14 16 18

σE/E0 (×104) z (µm)

(a) (b) (c) −40 −20 20 40 2 4 6 8 10 12 14 16 18

σE/E0 (×104) z (µm)

(a) (b) (c)

(a) (a) No heater No heater (b) (b) w w0

0 = 3 mm,

= 3 mm, P P0

0 = 37 MW

= 37 MW (c) (c) w w0

0 = 350

= 350 µ µm, m, P P0

0 = 1.2 MW

= 1.2 MW

Sliced final Sliced final energy spread in energy spread in FEL at 14 GeV FEL at 14 GeV

1 2 3 4 Σ∆f104 4 5 6 FEL Power Gain Length Ming Xie scaling Ming Xie scaling

λ λ0

0 = 15

= 15 µ µm, m, ∆ ∆I/I I/I0

0 = 1%

= 1%

to be published in PRSTAB to be published in PRSTAB

slide-16
SLIDE 16

Damping Ring Damping Ring ( (γε γε ≈ ≈ 30 30 µ µm) m)

add 14-meter chicane compressor in linac at 1/3-point (9 GeV) add 14 add 14-

  • meter chicane compressor

meter chicane compressor in linac at 1/3 in linac at 1/3-

  • point (9 GeV)

point (9 GeV) 1.1 mm 1.1 mm σ σz

z ≈

≈ 50 50 µ µm m σ σz

z ≈

≈ 12 12 µ µm m σ σz

z ≈

≈ 6 mm 6 mm SLAC Linac SLAC Linac

1 GeV 1 GeV 30 GeV 30 GeV FFTB FFTB RTL RTL

0.1 0.2 0.3 5 10 15 20 25 30 z /mm I /kA Ipk = 30.631 kA σz= 28.0 µm (FWHM: 24.6 µm, Gauss: 11.0 µm) 0.5 1 1.5 2 −2 2 4 ∆E/〈E〉 /% n/103 σE/〈E〉=1.51% (FWHM: 4.33%) 0.1 0.2 0.3 −2 2 4 z /mm ∆E/〈E〉 /% 〈E〉 = 28.493 GeV, Ne = 2.133×1010 ppb

Short Bunch Generation in the SLAC Linac Short Bunch Generation in the SLAC Linac

30 kA 30 kA 80 fsec 80 fsec FWHM FWHM

Existing bends compress to Existing bends compress to 40 fsec 40 fsec ~1.5 Å ~1.5 Å

compression by factor of compression by factor of 500 500

  • P. Emma
  • P. Emma et al.

et al., PAC’01 , PAC’01

slide-17
SLIDE 17

0.1 0.2 0.3 5 10 15 20 25 30 z /mm I /kA σz= 28.0 µm 1 2 −2 2 4 ∆E/〈E〉 /% n/103 σE/〈E〉=1.509 % 0.1 0.2 0.3 −2 2 4 z /mm ∆E/〈E〉 /% 〈E〉=28.492 GeV, Ne=2.133×1010 ppb

12 12 µ µm m 1.5 % 1.5 %

−20 20 0.02 0.04 0.06 z /mm I /kA σz= 6.0000 mm 2 4 −0.2 0.2 0.4 δ /% n/103 σE/〈E〉=0.0800 % −10 10 20 −0.3 −0.2 −0.1 0.1 0.2 0.3 z /mm δ /% 〈E〉 = 1.19000 GeV, Ne = 2.200×1010 ppb

6 mm 6 mm 0.08 % 0.08 %

energy energy profile profile phase phase space space temporal temporal profile profile 1.19 GeV 1.19 GeV

Particle tracking in 2D… Particle tracking in 2D…

−20 20 0.02 0.04 0.06 z /mm I /kA σz= 6.00 mm 1 2 3 −3 −2 −1 1 2 3 ∆E/〈E〉 /% n/103 σE/〈E〉=1.160 % −20 20 −3 −2 −1 1 2 3 z /mm ∆E/〈E〉 /% 〈E〉=1.189 GeV, Ne=2.200×1010 ppb

6 mm 6 mm 1.2 % 1.2 %

−2 2 4 0.05 0.1 0.15 0.2 0.25 0.3 z /mm I /kA σz= 1.158 mm 1 2 −2 −1 1 2 ∆E/〈E〉 /% n/103 σE/〈E〉=1.071 % −2 2 4 −2 −1 1 2 z /mm ∆E/〈E〉 /% 〈E〉=1.189 GeV, Ne=2.133×1010 ppb

1.2 mm 1.2 mm 1.1 % 1.1 %

−2 2 4 0.05 0.1 0.15 0.2 0.25 0.3 z /mm I /kA σz= 1.158 mm 2 4 −6 −4 −2 2 4 6 ∆E/〈E〉 /% n/103 σE/〈E〉=1.59 % −2 2 4 −5 5 z /mm ∆E/〈E〉 /% 〈E〉=9.001 GeV, Ne=2.133×1010 ppb

1.2 mm 1.2 mm 1.6 % 1.6 %

0.2 0.4 2 4 6 8 10 z /mm I /kA σz= 55.5 µm 1 2 3 −2 2 4 6 ∆E/〈E〉 /% n/103 σE/〈E〉=1.561 % 0.2 0.4 −2 2 4 z /mm ∆E/〈E〉 /% 〈E〉=9.004 GeV, Ne=2.133×1010 ppb

50 50 µ µm m 1.6 % 1.6 %

0.2 0.4 2 4 6 8 10 z /mm I /kA σz= 55.5 µm 1 2 −2 2 4 ∆E/〈E〉 /% n/103 σE/〈E〉=1.515 % 0.2 0.4 −2 2 4 z /mm ∆E/〈E〉 /% 〈E〉=28.487 GeV, Ne=2.133×1010 ppb

50 50 µ µm m 1.5 % 1.5 %

1.19 GeV 1.19 GeV 1.19 GeV 1.19 GeV 9 GeV 9 GeV 9 GeV 9 GeV 28 GeV 28 GeV 28 GeV 28 GeV

slide-18
SLIDE 18

Linac and FFTB Hall Linac and FFTB Hall

add undulator to FFTB hall at end of linac add undulator to FFTB add undulator to FFTB hall at end of linac hall at end of linac SLAC linac SLAC linac

slide-19
SLIDE 19

Undulator, Undulator, view upstream view upstream

Dave Fritz, Soo Lee, David Reis Dave Fritz, Soo Lee, David Reis

Undulator parameters: Undulator parameters: L Lu

u ≈

≈ 2.5 m, 2.5 m, λ λu

u =

= 8.5 cm, 8.5 cm, K K ≈ ≈ 4.3, 4.3, B B ≈ ≈ 0.55 T, 0.55 T, N Np

p ≈

≈ 30 30

slide-20
SLIDE 20

Source comparisons Source comparisons

Peak Peak brightness** brightness** Pulse length Pulse length (fsec) (fsec) Average flux Average flux (photons/sec) (photons/sec) Photons per Photons per pulse per pulse per 0.1% BW 0.1% BW

  • Rep. Rate
  • Rep. Rate

(Hz) (Hz) Table top Table top laser plasma laser plasma

1 1× ×10 109

9

500 500 1 1× ×10 106

6

100 100 1 1× ×10 104

4

ESRF ESRF

1 1× ×10 1024

24

8 8× ×10 104

4

3 3× ×10 1010

10

3 3× ×10 107

7

900 900

ALS* (streak ALS* (streak camera) camera)

5 5× ×10 1017

17

4 4× ×10 104

4

2 2× ×10 108

8

2 2× ×10 104

4

1 1× ×10 104

4

ALS slicing ALS slicing (undulator) (undulator)

1 1× ×10 1017

17

(6 (6× ×10 1019

19)

) 100 100 1 1× ×10 105

5

(3 (3× ×10 104

4)

) 10 10 (300) (300) 1 1× ×10 104

4

SPPS SPPS

1 1× ×10 1025

25

80 80 2 2× ×10 107

7

2 2× ×10 106

6

10 10

** ** photons/sec/mm photons/sec/mm2

2/mrad

/mrad2

2/0.1%

/0.1%-

  • bw

bw * streak camera resolution 1 psec, dqe 0.01

  • J. Hastings
  • J. Hastings

* streak camera resolution 1 psec, dqe 0.01

slide-21
SLIDE 21

UC Berkeley DESY

Roger W. Falcone Jochen Schneider Aaron Lindenberg Thomas Tschentscher Donnacha Lowney Horst Schulte-Schrepping Andrew MacPhee

APS Argonne Nat’l Lab BioCARS

Dennis Mills Keith Moffat Reinhard Pahl MSD Argonne National Lab Paul Fuoss Brian Stephenson

  • U. of Michigan

SLAC

David Reis Paul Emma Philip H. Bucksbaum Patrick Krejcik Adrian Cavalieri Holger Schlarb (DESY) Soo Lee John Arthur David Fritz Sean Brennan Matthew F. DeCamp Roman Tatchyn Jerome Hastings Kelly Gafney

NSLS Copenhagen University

  • D. Peter Siddons

Jens Als-Nielsen Chi-Chang Kao

Uppsala University

Janos Hajdu

Lund University

David van der Spoel Jörgen Larsson Richard W. Lee Ola Synnergren Henry Chapman Tue Hansen Carl Calleman Magnus Bergh

Chalmers University of Technology

Gosta Huldt Richard Neutze

ESRF

  • F. Sette

ESRF

  • F. Sette

SPPS Collaboration SPPS Collaboration

Sub-Picosecond Pulse Source Sub Sub-

  • Picosecond Pulse Source

Picosecond Pulse Source

slide-22
SLIDE 22

R&D at SPPS Towards LCLS R&D at SPPS Towards LCLS

  • Wakefields of micro

Wakefields of micro-

  • bunch in RF structures

bunch in RF structures

  • Develop bunch length diagnostics

Develop bunch length diagnostics

  • RF phase and voltage stability of linac

RF phase and voltage stability of linac

  • Emittance growth in compressor chicane (CSR)

Emittance growth in compressor chicane (CSR)

slide-23
SLIDE 23

φ φ1

1 (deg)

(deg)

Chicane energy constant Chicane energy constant to <5 MeV (0.06%) rms to <5 MeV (0.06%) rms

Wakefield Wakefield energy energy-

  • loss used

loss used to confirm bunch to confirm bunch length… length…

  • K. Bane
  • K. Bane et al.

et al., PAC’03 , PAC’03

slide-24
SLIDE 24

Bunch length confirmed with strong Bunch length confirmed with strong wakefield wakefield-

  • induced

induced energy loss of 1870 energy loss of 1870-

  • m of SLAC linac:

m of SLAC linac: σ σz

zmin

min ≈

≈ 50 50 µ µm. m.

slide-25
SLIDE 25

Far Far-

  • Infrared Detection of Wakefields from Ultra

Infrared Detection of Wakefields from Ultra-

  • Short Bunches

Short Bunches

Linac RF phase (chirp) Linac RF phase (chirp)

  • H. Schlarb (DESY),
  • H. Schlarb (DESY), et al

et al. .

slide-26
SLIDE 26

Bunch length is also measured with transverse Bunch length is also measured with transverse deflecting rf deflecting rf : : σ σz

z ≈

≈ 50 to 70 50 to 70 µ µm m

28 GeV 28 GeV 50 50 µ µm m

62 62 µ µm rms bunch length m rms bunch length

deflector deflector

OFF OFF

σ σy

y2 2 (arb)

(arb)

  • R. Akre
  • R. Akre et al.

et al., EPAC’02 , EPAC’02

deflector deflector

ON ON rf phase (deg) rf phase (deg)

slide-27
SLIDE 27
  • P. Muggli, M. Hogan
  • P. Muggli, M. Hogan
slide-28
SLIDE 28

80 fs rms 80 fs rms (15 kA) (15 kA)

slide-29
SLIDE 29

SLAC Linac SLAC Linac

1 GeV 1 GeV 30 GeV 30 GeV 9 GeV 9 GeV

e e−

− Energy (MeV)

Energy (MeV)

BPM

Linac Phase Stability Estimate Based on Energy Jitter in Chicane Linac Phase Stability Estimate Based on Energy Jitter in Chicane

〈 〈∆ ∆φ φ 2

2〉

〉1/2

1/2 < 0.1 deg (100 fs)

< 0.1 deg (100 fs)

σ σE

E/E

/E0

0 ≈

≈ 0.06% 0.06%

slide-30
SLIDE 30

Chicane Parameters Chicane Parameters

14.3 m 14.3 m

  • L. Bentson
  • L. Bentson et al.

et al., PAC’01 , PAC’01

slide-31
SLIDE 31

e e−

−

14 14-

  • m chicane in

m chicane in sector sector-

  • 10 of

10 of SLAC linac SLAC linac

slide-32
SLIDE 32

Small ‘tweaker’ quads included Small ‘tweaker’ quads included to control residual to control residual x x-

  • dispersion.

dispersion. Last Y Last Y-

  • chamber was copper

chamber was copper coated to limit resistive coated to limit resistive-

  • wake.

wake. Vacuum chamber too large Vacuum chamber too large for CSR shielding… for CSR shielding… ( (π πσ σz

zR

R1/2

1/2)

)2/3

2/3 ≈

≈ 8 mm << 8 mm << r r

slide-33
SLIDE 33

Dispersion is measured by energy variations correlated with BPM Dispersion is measured by energy variations correlated with BPM readings readings

Z Z/m /m

tweaker quads tweaker quads

slide-34
SLIDE 34

Four wire Four wire-

  • scanners

scanners within 60 m of end within 60 m of end

  • f chicane
  • f chicane —

— used used to measure to measure x x-

  • emittance.

emittance. Emittance Emittance measured with measured with precision of 2 precision of 2-

  • 4%,

4%,

  • ver <1 hour.
  • ver <1 hour.

β βx

x = 5 m

= 5 m

slide-35
SLIDE 35

Horizontal beta function through chicane effects Horizontal beta function through chicane effects emittance growth… has been matched and verified: emittance growth… has been matched and verified:

β βx

x (m)

(m) α αx

x

ζ ζx

x

Design: Design: 47.2 47.2 − −2.03 2.03 − −2.17 2.17 ± ± 0.08 0.08 1.000 1.000 Measured: Measured: 50.6 50.6 ± ± 1.7 1.7 1.002 1.002 ± ± 0.003 0.003

slide-36
SLIDE 36

Residual Residual x x-

  • dispersion (and its angle) is precision

dispersion (and its angle) is precision minimized using ‘tweaker’ quads in the chicane minimized using ‘tweaker’ quads in the chicane Linear comb. of tweaker quads Linear comb. of tweaker quads

slide-37
SLIDE 37

CSR simulations with 1D model (unshielded) CSR simulations with 1D model (unshielded)

(good agreement with 3D (good agreement with 3D-

  • model studied by F. Stulle

model studied by F. Stulle -

  • DESY)

DESY) FWHM/2.35 FWHM/2.35 ≈ ≈ 35 35 µ µm m 3.4 nC 3.4 nC 9 kA 9 kA 0.3 kA 0.3 kA

slide-38
SLIDE 38

CSR simulations (1D) along chicane CSR simulations (1D) along chicane

~10% ~10% ~20% ~20% ISR ISR = Incoherent Synch. = Incoherent Synch. Rad Rad. .

slide-39
SLIDE 39

All 4 individual beam sizes with asymmetric All 4 individual beam sizes with asymmetric-

  • gaussian fits

gaussian fits

wire-3 wire-1 wire-2 wire-4

chicane-OFF chicane-ON chicane chicane-

  • OFF

OFF chicane chicane-

  • ON

ON

wire wire-

  • 1

1 wire wire-

  • 2

2 wire wire-

  • 4

4 wire wire-

  • 3

3

σ σx

x =

= 263 263 µ µm m σ σx

x =

= 335 335 µ µm m σ σx

x =

= 80 80 µ µm m σ σx

x =

= 90 90 µ µm m σ σx

x =

= 113 113 µ µm m σ σx

x =

= 142 142 µ µm m σ σx

x =

= 205 205 µ µm m σ σx

x =

= 245 245 µ µm m

slide-40
SLIDE 40

Chicane Chicane OFF OFF Chicane Chicane ON ON

γε γεx

x = 34.2

= 34.2 ± ± 0.7 0.7 µ µm m γε γεx

x = 27.6

= 27.6 ± ± 0.6 0.6 µ µm m

slide-41
SLIDE 41

Bend Bend-

  • Plane Emittance: Chicane

Plane Emittance: Chicane ON ON and and OFF OFF

Bend Bend-

  • plane

plane emittance emittance data is data is consistent consistent with with calculations calculations and sets and sets upper limit upper limit

  • n CSR
  • n CSR

effect effect

  • P. Emma
  • P. Emma et al.

et al., PAC’03 , PAC’03

slide-42
SLIDE 42

Concluding Remarks Concluding Remarks

Emittance growth consistent with Emittance growth consistent with calculations, but no calculations, but no rad

  • rad. measurements

. measurements SPPS SPPS will run until will run until LCLS LCLS displaces the displaces the beamline in ~2007 beamline in ~2007 LCLS LCLS will begin operation at end of 2008 will begin operation at end of 2008 Spontaneous device can be added to Spontaneous device can be added to LCLS LCLS to allow to allow Super Super-

  • SPPS

SPPS in long in long-

  • term

term Thanks Alex and Lia for invitation Thanks Alex and Lia for invitation