TTF2 Start-to-End Simulations Jean-Paul Carneiro DESY Hamburg TESLA COLLABORATION MEETING

TTF2 Start-to-End Simulations

Jean-Paul CarneiroDESY Hamburg

TESLA COLLABORATION MEETING

DESY Zeuthen, 22 Jan 2004

S2E simulation web site (TTF1, TTF2, XFEL)

Start-to-End Simulations TTF1, TTF2 and XFEL•TTF1• Start-to-End Simulations of SASE FEL at the TESLA Test Facility, Phase 1.

•TTF2 • Optimized version (6.4 nm, 1GeV) • Operation wihout 3.9 GHz cavity : Case 0.5 nC, 4 ps sigma, magnetic compression• Operation without 3.9 GHz cavity : Case 1.0 nC, 4 ps sigma, velocity bunching • Operation without 3.9 GHz cavity : Case 1.0 nC, 20 ps flat top, velocity bunching

• XFEL • Benchmark S2E workshop, August 2003 (20.5 GeV, 3 chicanes, 12 kA peak)• Revised version of the S2E workshop benchmark with 5 kA peak• Benchmark ESFRI XFEL workshop, October 2003 (20.0 GeV, 2 chicanes, 5 kA)

Last Updated: 13 January 2004

Content Owner: J.-P. Carneiro, DESY

Page Editor: J.-P. Carneiro, DESY

http://www.desy.de/s2e-simu

http://desyntwww.desy.de/S2E/TESLAXFEL_files.htm



TTF2 / Case 0.5 C, 4 ps laser pulse, magnetic compression (E. Schneidmiller proposal, Optics optimization by N. Golubeva)

Jean-Paul Carneiro TTF2 Start-to-End Simulations

Case No CSR, No Wakefields, ASTRA+ELEGANT, 100k particules, 1000 slices.

BC2 BC3ACC2

RF GUN

ACC3 ACC4 ACC5 ACC6 ACC7

UNDULATOR

%5.0σ

mm 1.4zσ

MeV 124

%32.0σ

mm51.0zσ

MeV 374

%27.0σ

mm37.0zσ

MeV 439

ACC1

LASER 4 ps sigma RMS, 3 mm uniformRF GUN 40 MV/m , 31 DegSOLENOIDS 0.163 TACC1 8 × 14 MV/m, 8 × -8.5 Deg w.r.t on crestBC2 18 Deg

ACC2 & ACC3 15.31 MV/m, 78 DegBC3 3.8 DegACC4 7.85 MV/m, 90 DegACC5, ACC6 & ACC7 offUNDULATOR ???


TTF2 / Case 0.5 C, 4 ps laser pulse, magnetic compression

-4 -3 -2 -1 0 1 2 3 40

5

10

15

20

25

30

35

40

45

50Current Distribution Z=13.59 METERS / 500 pC Case

Z [mm]

Cur

rent

[A

]

TAIL HEAD

END INJECTOR (13.59 m) / RMS Bunch Length ~ 1.4 mm


-4 -3 -2 -1 0 1 2 3 40

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5Slice Emittance Z=13.59 METERS / 500 pC Case

Z [mm]

Em

ittan

ce [

mm

-mra

d]

TAIL HEAD

X

Y


END INJECTOR (13.59 m) / Projected RMS Emittance ~ 1.6 mm-mrad


-4 -3 -2 -1 0 1 2 3 40

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1Slice RMS size Z=13.59 METERS / 500 pC Case

Z [mm]

RM

S s

ize

[mm

]

TAIL HEAD

x

y


END INJECTOR (13.59 m) / Projected RMS Size ~ 0.36 mm



END INJECTOR (13.59 m) / Total Energy 124.25 MeV


-4 -3 -2 -1 0 1 2 3 40

1

2

3

4

5

6

7

8

9

10Slice Energy Spread Z=13.59 METERS / 500 pC Case

Z [mm]

Ene

rgy

Spr

ead

[keV

/c]

TAIL HEAD


END INJECTOR (13.59 m) / Total Energy Spread ~ 626 keV


-1.4 -1.2 -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.40

200

400

600

800

1000

1200

1400Current Distribution Z=13.59 METERS / 500 pC Case

Z [mm]

Cur

rent

[A

]

TAIL HEAD

0.31 0.315 0.32 0.325 0.33 0.335 0.34 0.345 0.35 0.355 0.360

200

400

600

800

1000

1200

1400Current Distribution End Linac/ 500 pC Case

Z [mm]

Cur

rent

[A

]

ZOOM CURRENT DISTRIBUTION


ENTRANCE ONDULATOR

50 µm / 1.3 kA


-1.4 -1.2 -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.40

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5Slice Emittance End Linac / 500 pC Case

Z [mm]

Em

ittan

ce [

mm

-mra

d]

TAIL HEAD

X

Y

0.31 0.315 0.32 0.325 0.33 0.335 0.34 0.345 0.35 0.355 0.360

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2Slice Emittance End Linac / 500 pC Case

Z [mm]E

mitt

ance

[m

m-m

rad]

ZOOM SLICE EMITTANCE

X

Y


1.2 mm-mrad

ENTRANCE ONDULATOR


-1.4 -1.2 -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.40

100

200

300

400

500

600Slice Energy Spread End Linac / 500 pC Case

Z [mm]

Ene

rgy

Spr

ead

[keV

/c]

TAIL HEAD

0.31 0.315 0.32 0.325 0.33 0.335 0.34 0.345 0.35 0.355 0.360

100

200

300

400

500

600Slice Energy Spread End Linac / 500 pC Case

Z [mm]

Ene

rgy

Spr

ead

[keV

/c]

ZOOM SLICE ENERGY SPREAD


~ 200 keV

ENTRANCE ONDULATOR



ENTRANCE ONDULATOR


-1.4 -1.2 -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.40

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4Slice RMS size End Linac / 500 pC Case

Z [mm]

RM

S s

ize

[mm

]

TAIL HEAD

x

y

0.31 0.315 0.32 0.325 0.33 0.335 0.34 0.345 0.35 0.355 0.360

0.05

0.1

0.15

0.2

0.25Slice RMS size End Linac / 500 pC Case

Z [mm]

RM

S s

ize

[mm

]

ZOOM SLICE SIZE

x

y

TTF2 / Case 0.5 C, 4 ps laser pulse, magnetic compression (E. Schneidmiller proposal)

ENTRANCE ONDULATOR

Jean-Paul Carneiro

RESUME Case 0.5 nC


• Peak Current : 1.3 kA Saturation at λ = 31 nm Slice Emittance : 1.2 mm-mrad Saturation Length L ~ 11 m Slice Energy Spread : 200 keV Saturation Power P ~ 1.8 GW Total Energy : 439 MeV

For this configuration (No CSR effects, No Space Charge from BC2 to end linac, No Wakefields :

If energy increases to 1 GeV λ = 6.1 nm, L ~ 19 m, P ~ 2.3 GW

} From PARMS B. Faatz

• Case 500pc looks promising. Need to add CSR, Wakefields effects and Space Charge in the linac.

Jean-Paul Carneiro

ACC 1 DOUBLET RF GUN+ SOLENOIDES

dump

Bunch Charge 1 nCLaser Diameter 3 mm (uniform)Laser pulse length Case 4 ps gaussian and 20 ps flat topSolenoid Bmax 163 mTPhase Gun ~ 31 DegField Cathode 40 MV/mACC1 (cav 1 to 8) 14 MV/mPhases ACC1 Change Phase First Cavity and run other 7 cavities at max energy.

STOP SIMULATIONS AT Z =13.59 M

TTF2 Velocity Bunching(K. Floettmann proposal)



TTF2 Velocity Bunching

-30 -20 -10 0 10 20 300

500

1000

1500

2000

Time [ps]P

op

ula

tion

-15 -10 -5 0 5 10 150

500

1000

1500

2000

2500

Time [ps]

Po

pu

latio

n

Case 4 ps sigma RMS4 ps RMS laser pulse cut at 3 sigma

Therm. Emit. 0.55 eV

Case 20 ps flat top4 ps RMS laser pulse cut at 3 sigma

Therm. Emit. 0.55 eV



-140 -120 -100 -80 -60 -40 -20 00.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2

2.2

Phase First Cavity [Deg]

RM

S B

unch

Len

gth

z [

mm

]

Velocity Bunching Case 4 ps RMS Laser Pulse

-140 -120 -100 -80 -60 -40 -20 00

0.5

1

1.5

2

2.5

3

Phase First Cavity [Deg]R

MS

Bun

ch L

engt

h

z [m

m]

Velocity Bunching Case 20 ps Flat Top Laser Pulse

END INJECTOR (13.59 m)

Case 4 ps Case 20 ps



-140 -120 -100 -80 -60 -40 -20 0108

110

112

114

116

118

120

122

124

126


Mom

entu

m [

Mev

/c]


-140 -120 -100 -80 -60 -40 -20 0108

110

112

114

116

118

120

122

124

126

Phase First Cavity [Deg]M

omen

tum

[M

ev/c

]






-140 -120 -100 -80 -60 -40 -20 00

500

1000

Ene

rgy

Spr

ead

[keV

]



-140 -120 -100 -80 -60 -40 -20 00

0.5

1

Ene

rgy

Spr

ead

[%]

Energy Spread [keV]Energy Spread [%]

-140 -120 -100 -80 -60 -40 -20 0100

200

300

400

500

600

Ene

rgy

Spr

ead

[keV

]



-140 -120 -100 -80 -60 -40 -20 00.1

0.2

0.3

0.4

0.5

0.6

Ene

rgy

Spr

ead

[%]

Energy Spread [keV]Energy Spread [%]





-140 -120 -100 -80 -60 -40 -20 00

10

20

30

40

50

60


RM

S E

mitt

ance

(

x= x )

[m

m-m

rad]


-140 -120 -100 -80 -60 -40 -20 00

10

20

30

40

50

60

70

80

90


MS

Em

ittan

ce (

x=

x ) [

mm

-mra

d]






-140 -120 -100 -80 -60 -40 -20 00

0.5

1

1.5

2

2.5

3

3.5

4


MS

Tra

nsve

rse

Siz

e (

x=

y ) [

mm

]


-140 -120 -100 -80 -60 -40 -20 00

0.5

1

1.5

2

2.5

3

3.5

4


RM

S T

rans

vers

e S

ize

( x=

y )

[m

m]






-140 -120 -100 -80 -60 -40 -20 050

100

150

200

250

300

350

400


Long

itudi

nal E

mitt

ance

(

z ) [

keV

-mm

]


-140 -120 -100 -80 -60 -40 -20 0100

150

200

250

300

350

400

450

500

550

600

Phase First Cavity [Deg]Lo

ngitu

dina

l Em

ittan

ce (

z )

[

keV

-mm

]






• Case 4 ps Phase -92 Deg



• Case 20 ps Phase -91 Deg


• Velocity Bunching needs much more studies (s2e, jitter,…)

RESUME Velocity Bunching

Documents

TTF2 Start-to-End Simulations Jean-Paul Carneiro DESY Hamburg TESLA COLLABORATION MEETING