lab report temf - tu darmstadt · 4 temf, tu darmstadt tesla meeting, desy, zeuthen, 01/21/04...
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Institut fürTheorie Elektromagnetischer Felder
TechnischeTechnische UniversitätUniversität Darmstadt, Darmstadt, FachbereichFachbereich ElektrotechnikElektrotechnik und und InformationstechnikInformationstechnikSchloßgartenstrSchloßgartenstr. 8, 64289 Darmstadt, Germany. 8, 64289 Darmstadt, Germanyweilandweiland@@temftemf..tutu--darmstadtdarmstadt.de, www.TEMF.de.de, www.TEMF.de
Lab ReportTEMF - TU DarmstadtW. Ackermann, R. Hampel, M. Kunze
T. Lau, W.F.O. Müller, S. Setzer, T. Weiland, I. Zagorodnov
TESLA Collaboration MeetingDESY, Zeuthen, 01/21/04
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4Outline
• Wakefield Simulations for the PITZ-Injector(W. Ackermann, S. Setzer)
• Wakefields in the 3rd Harmonic Structure (I. Zagorodnov)
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4Gun Layout
MAFIA
ASTRA
Handover
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4ASTRA to MAFIA Interface
• ASTRA♦ fast & efficient♦ no interaction between boundary and beam
• MAFIA♦ full set of Maxwells equations♦ interaction with surrounding structures♦ limited by cpu time & memory
z
z
Interface
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4Parameters used for Simulations (1)
AccE = 42 MV/m, = 33°ϕ
• RF-Gun Settings
zB 175 mT, z = 0.275 m=
• Solenoid Settings
These parameters resultin minimum
transverse emittance @ EMSY
Mag. Fluxdensity on axis
0.0 0.2 0.4 0.6 0.80
255075
100125150175
Bz(r
=0) /
mT
z / m
FWHM Rise
RMS
20 ps, 5 ps (Flat-Top)x,y = 0.5 mmQ = 1 nC
T T= =• Bunch Parameters
50.000 Macroparticles
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4Parameters used for Simulations (2)
Transverse Emittance calculated with ASTRA
0.0 0.5 1.0 1.5 2.00
5
10
15
x,y-
Em
ittan
ce / π
mm
-mra
d
z / m
EMSY
1.852
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4Interface Validation (1): Drift Tube
0.0 0.5 1.0 1.5 2.00.0
0.1
0.2
0.3
0.4
0.5 ASTRA (Complete run) MAFIA (Bunch from ASTRA) ASTRA (Bunch from MAFIA)
x-E
mitt
ance
/ π
mm
-mra
d
z / m
Zoom onnext slide
Comparison without Space Charge
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4Interface Validation (1): Drift Tube
0.6 0.8 1.0 1.2 1.4 1.60.27
0.28
0.29
0.30
0.31 X-Emittance ASTRA Y-Emittance ASTRA X-Emittance MAFIA (Bunch from ASTRA) Y-Emittance MAFIA (Bunch from ASTRA) X-Emittance ASTRA (Bunch from MAFIA) Y-Emittance ASTRA (Bunch from MAFIA)
E
mitt
ance
/ π
mm
-mra
d
z / m
Comparison without Space Charge
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4Interface Validation (2): Drift Tube
0.0 0.5 1.0 1.5 2.00
5
10
15 ASTRA (Complete run) MAFIA (Bunch from ASTRA) ASTRA (Bunch from MAFIA)
x-E
mitt
ance
/ π
mm
-mra
d
z / m
Zoom onnext slide
Comparison including Space Charge
30 cmTube
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4Interface Validation (2): Drift Tube
0.6 0.8 1.0 1.2 1.4 1.61.5
2.0
2.5
3.0
3.5 X-Emittance ASTRA Y-Emittance ASTRA X-Emittance MAFIA (Bunch from ASTRA) Y-Emittance MAFIA (Bunch from ASTRA) X-Emittance ASTRA (Bunch from MAFIA) Y-Emittance ASTRA (Bunch from MAFIA)
Em
ittan
ce / π
mm
-mra
d
z / m
Comparison including Space Charge
Deviations caused by different space charge calculation methods
∆ε = 0.091 π mm mrad
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4Influence of Diagnostic Doublecross (1)
0.0 0.5 1.0 1.5 2.00
5
10
15 ASTRA (Up to diagnostic cross) MAFIA (Bunch from ASTRA) ASTRA (Bunch from MAFIA)
x-E
mitt
ance
/ π
mm
-mra
d
z / m
Cross without Mirror (0 mm Beam Offset)
Zoom onnext slide
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4Influence of Diagnostic Doublecross (1)
Cross without Mirror (0 mm Beam Offset)
0.079 π mm mradε∆ =
0.6 0.8 1.0 1.2 1.4 1.6
2.0
2.5
3.0 ASTRA (Up to diagnostic cross) MAFIA (Bunch from ASTRA) ASTRA (Bunch from MAFIA)
x-
Em
ittan
ce / π
mm
-mra
d
z / m
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4Influence of Laser Mirror
• Model of Laser Mirror
Laser
12.5 mm - offset 18.5 mm
Beam
x
z
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4Influence of Diagnostic Doublecross (2)
0.0 0.5 1.0 1.5 2.00
5
10
15 ASTRA (Up to diagnostic cross) MAFIA (Bunch from ASTRA) ASTRA (Bunch from MAFIA)
x-E
mitt
ance
/ π
mm
-mra
d
z / m
Cross with Mirror (0 mm Beam Offset)
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4Influence of Diagnostic Doublecross (3)
0.0 0.5 1.0 1.5 2.00
5
10
15 ASTRA (Up to diagnostic cross) MAFIA (Bunch from ASTRA) ASTRA (Bunch from MAFIA)
x-E
mitt
ance
/ π
mm
-mra
d
z / m
Cross with Mirror (1 mm Beam Offset)
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15
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4Influence of Diagnostic Doublecross (4)
0.0 0.5 1.0 1.5 2.00
5
10
15 ASTRA (Up to diagnostic cross) MAFIA (Bunch from ASTRA) ASTRA (Bunch from MAFIA)
x-E
mitt
ance
/ π
mm
-mra
d
z / m
Cross with Mirror (2 mm Beam Offset)
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4Influence of Diagnostic Doublecross (5)
0.0 0.5 1.0 1.5 2.00
5
10
15 ASTRA (Up to diagnostic cross) MAFIA (Bunch from ASTRA) ASTRA (Bunch from MAFIA)
x-E
mitt
ance
/ π
mm
-mra
d
z / m
Cross with Mirror (3 mm Beam Offset)
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4Influence of Diagnostic Doublecross (6)
0.0 0.5 1.0 1.5 2.00
5
10
15 ASTRA (Up to diagnostic cross) MAFIA (Bunch from ASTRA) ASTRA (Bunch from MAFIA)
x-E
mitt
ance
/ π
mm
-mra
d
z / m
Cross with Mirror (4 mm Beam Offset)
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4
0.6 0.8 1.0 1.2 1.4 1.6
2.0
2.5
3.0
ASTRA MAFIA (Bunch from ASTRA) ASTRA (Bunch from MAFIA)
Diagnostic Cross, no Mirror
x-E
mitt
ance
/ π
mm
-mra
d
z / m
4 mm
0 mm1 mm
2 mm
3 mm
?
Summary: Influence of Beam Offset on x-Emittance
∆εx
= 0.
655 π
mm
mra
d
Influence of Diagnostic Doublecross (7)
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4Influence of Diagnostic Doublecross (8)
4 mm
0 mm
Summary: Influence of Beam Offset on y-Emittance
0.6 0.8 1.0 1.2 1.4 1.6
2.0
2.5
3.0
ASTRA MAFIA (Bunch from ASTRA) ASTRA (Bunch from MAFIA)
Diagnostic Cross, no Mirror
y-E
mitt
ance
/ π
mm
-mra
d
z / m
∆εy
= 0.
295 π
mm
mra
d
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4
• „ MAFIA ↔ ASTRA“ interface implemented♦ MAFIA TS3 bunch can be used as starting condition for ASTRA at
any position along the beam line (and vice versa)
♦ Validated by reference runs (with and without Space Charge)
• Simulation results♦ Optimal simulation parameters used
(min. emittance @ EMSY)
♦ Effect of the diagnostic doublecross on the transverse beam emittance @ EMSY (1.618 m) is about 0.08 π mm mmrad
♦ Effect of the laser mirror on the transverse beam emittance depends on the beam offset
♦ 4 mm Offset causes emittance growth @ EMSY∆εx = 0.655 π mm mrad ; ∆εy = 0.295 π mm mrad
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4Outline
• Wakefield Simulations for the PITZ-Injector(W. Ackermann, S. Setzer)
• Wakefields in the 3rd Harmonic Structure(I. Zagorodnov)
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22
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4Wake functions of the3rd Harmonic Section
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4Geometry
1460 1470 1480 1490 1500 1510-4
-2
0
2
4
/z cm
/r cm
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4Long Range Wake Function
0 20 40 60 80 100
-100
-50
0
500
||
/W
V pC
/s cm0 5 10 15 200
0.5
1
1.5
2x 10130
||ZT Ω
/f G H z14
||1
2( ) 2 ( ) cos( )i ii
w s s K f scπθ
=
= ∑
1mmσ =
if /GHz 3.90 5.65 5.73 6.97 7.54 7.69 8.65
iK /(V/pC) 18.3 0.73 0.61 0.20 7.44 3.08 0.22
if , GHz 9.98 10.7 11.6 12.5 13.9 15.3 16.3
iK /(V/pC) 0.63 0.72 2.08 0.60 1.25 0.34 0.41
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4LOLA Cavity
σσyy
LOLA RF deflecting cavity to measure the bunch length at
the end of the linac
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4Wake Function of the LOLA Cavity
0 0.5 1 1.5 2 2.5-250
-200
-150
-100
-50
00
||
/WV pC
/s cm
1mmσ =
short range−
long range−
The short-range (dashed line) and long-range (dot-dashed line) longitudinal wake functions
Lab ReportTEMF - TU DarmstadtOutlineGun LayoutASTRA to MAFIA InterfaceParameters used for Simulations (1)Parameters used for Simulations (2)Interface Validation (1): Drift TubeInterface Validation (1): Drift TubeInterface Validation (2): Drift TubeInterface Validation (2): Drift TubeInfluence of Diagnostic Doublecross (1)Influence of Diagnostic Doublecross (1)Influence of Laser MirrorInfluence of Diagnostic Doublecross (2)Influence of Diagnostic Doublecross (3)Influence of Diagnostic Doublecross (4)Influence of Diagnostic Doublecross (5)Influence of Diagnostic Doublecross (6)Influence of Diagnostic Doublecross (7)Influence of Diagnostic Doublecross (8)OutlineWake functions of the3rd Harmonic SectionGeometryLong Range Wake FunctionLOLA CavityWake Function of the LOLA Cavity