First operation of the TTF2 injector with beam

Jean-Paul CarneiroDESY Hamburg

TESLA COLLABORATION MEETING

DESY Hamburg, 16 Sept 2003

TTF2 INJECTOR SCHEMATIC

Jean-Paul Carneiro FIRST OPERATION OF THE TTF2 INJECTOR WITH BEAM

BC 2

(1) From P.Piot, EPAC 2002, p. 1798(2) From S. Schreiber, private communication

ACC 1 DOUBLET S. H. TRIPLET RF GUN+ SOLENOIDES

dump

Bunch Charge 1 nC OKLaser Diameter 3 mm (uniform) OKLaser pulse length 20 ps flat top + 3 ps rise time 20 ps flat top + 6 ps rise time Solenoid Bmax 163 mT OKPhase Gun 34 Deg OKField Cathode 40 MV/m OKACC1 (cav 1 to 4) 12.5 MV/m 15 MV/mACC1 (cav 5 to 8) 20 MV/m 15 MV/mPhase ACC1 -10.8 Deg (w.r.t max energy) on crestACC39 14 MV/m not presentPhase ACC39 183.0 Deg (w.r.t max energy) not present

Nominal Operation (1) First Operation (2)

STOP SIMULATIONS AT Z =19 M

Jean-Paul Carneiro FIRST OPERATION OF THE TTF2 INJECTOR WITH BEAM

TTF2 LASER (ASTRA GENERATOR OUTPUTS, 2E5 p.)

• Transverse distribution : uniform, r = 1.5 mm• Longitudinal distribution : uniform, L=20 ps with ~5 ps rise times• Thermal emittance : 55 keV

From TELSA-FEL 97-01 (K. Floettmann) : mradmm63.03

12

2 ,20

,

rmsnkin

rmsncm

Er

Longitudinal distribution Transverse distribution

-30 -20 -10 0 10 20 300

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Time [ps]

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Jean-Paul Carneiro FIRST OPERATION OF THE TTF2 INJECTOR WITH BEAM

PHASE SCAN OF TESLA XFEL WITH ASTRA

• TTF2 NOMINAL : 40 MV/m, 0.163 T, L = 20 ps + 3 ps rise time, r =1.5 mm (plot presented at the S2E Workshop, DESY ZEUTHEN, AUG-2002, http://www.desy.de/s2e)

-10 -5 0 5 100

0.2

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1

RF GUN LAUNCH PHASE [DEG]

CH

AR

GE

[nC

]SPACE CHARGE OFFSPACE CHARGE ON

SPACE CHARGE ON & OFFZERO-CROSSING = - 6 DEG

ENERGY AND ENERGY SPREAD

Jean-Paul Carneiro FIRST OPERATION OF THE TTF2 INJECTOR WITH BEAM

0 5 10 15 200

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]

FIRST OPERATIONNOMINAL

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Z [m]

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tal E

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[Me

V]

FIRST OPERATIONNOMINAL

Jean-Paul Carneiro FIRST OPERATION OF THE TTF2 INJECTOR WITH BEAM

LONG. PHASE SPACE AT Z=19 M (END INJECTOR)

TAILTAIL

HEAD

HEAD

TAIL

NOMINAL FIRST OPERATION

EMITTANCE AND ENVELOPE

Jean-Paul Carneiro FIRST OPERATION OF THE TTF2 INJECTOR WITH BEAM

0 5 10 15 200

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[mm

] FIRST OPERATIONNOMINAL

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m-m

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FIRST OPERATIONNOMINAL

Jean-Paul Carneiro FIRST OPERATION OF THE TTF2 INJECTOR WITH BEAM

BUNCH LENGTH

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t [m

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First OperationNominal

Jean-Paul Carneiro FIRST OPERATION OF THE TTF2 INJECTOR WITH BEAM

SPOT AND TRANSVERSE PHASE SPACE (AT Z =19 M)

Jean-Paul Carneiro FIRST OPERATION OF THE TTF2 INJECTOR WITH BEAM

SLICE EMITTANCE AND RMS SIZE (19 M)

-6 -4 -2 0 2 4 60

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RM

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MIT

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NC

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m-m

rad

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FIRST OPERATIONNOMINAL

-6 -4 -2 0 2 4 60

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m]

FIRST OPERATIONNOMINAL

Jean-Paul Carneiro FIRST OPERATION OF THE TTF2 INJECTOR WITH BEAM

CURRENT DISTRIBUTION (AT Z =19 M)

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Z [mm]

Cu

rre

nt [

A]

FIRST OPERATIONNOMINAL

Jean-Paul Carneiro FIRST OPERATION OF THE TTF2 INJECTOR WITH BEAM

CONCLUSION

• CHARGE 1 nC 1 nC• MOMEMTUN 121.7 MeV/c 134.05 MeV/c• ENERGY SPREAD 0.9 [%] 0.2 [%]• RMS EMITTANCE 1.28 [mm-mrad] 1.75 [mm-mrad] • RMS SIZE 0.41 [mm] 0.41 [mm]• BUNCH LENGTH 1.88 [mm] 2.1 [mm]• PEAK CURRENT ~ 60 [A] ~ 40 [A]• SLICE EMITTANCE ~ 1 [mm-mrad] ~ 1 [mm-mrad]

NOMINAL FIRST OPERATION