Lab Report TEMF - TU Darmstadt
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1 Institut für Theorie Elektromagnetischer Felder Lab Report TEMF - TU Darmstadt W. Ackermann, R. Hampel, M. Kunze T. Lau, W.F.O. Müller, S. Setzer, T. Weiland, I. Zagorodnov TESLA Collaboration Meeting DESY, Zeuthen, 1/21/4 Technische Universität Darmstadt, Fachbereich Elektrotechnik und Informationstechnik Schloßgartenstr.. 8, Darmstadt, Germany weiland@temf temf.tu-darmstadt.de,
2 Outline Wakefield Simulations for the PITZ-Injector (W. Ackermann, S. Setzer) Wakefields in the 3 rd Harmonic Structure (I. Zagorodnov) 1
3 2 Handover ASTRA MAFIA Gun Layout
4 ASTRA ASTRA to MAFIA Interface fast & efficient no interaction between boundary and beam MAFIA full set of Maxwells equations interaction with surrounding structures limited by cpu time & memory z Interface z 3
5 Parameters used for Simulations (1) 4 Solenoid Settings Bz = 175 mt, z =.275 m RF-Gun Settings E Acc = 42 MV/m, ϕ = 33 Bunch Parameters T FWHM x,y RMS Q = 1 nc Rise B z (r=) / mt = 2 ps, T = 5 ps (Flat-Top) =.5 mm 5. Macroparticles Mag. Fluxdensity on axis These parameters result in minimum transverse EMSY
6 5 Parameters used for Simulations (2) 15 Transverse Emittance calculated with ASTRA 1 5 EMSY x,y-emittance / π mm-mrad
7 Interface Validation (1): Drift Tube 6 x-emittance / π mm-mrad Comparison without Space Charge Zoom on next slide ASTRA (Complete run) MAFIA (Bunch from ASTRA) ASTRA (Bunch from MAFIA)
8 Interface Validation (1): Drift Tube Emittance / π mm-mrad Comparison without Space Charge 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)
9 Interface Validation (2): Drift Tube 8 x-emittance / π mm-mrad Comparison including Space Charge 3 cm Tube ASTRA (Complete run) MAFIA (Bunch from ASTRA) ASTRA (Bunch from MAFIA) Zoom on next slide
10 Interface Validation (2): Drift Tube 3.5 Comparison including Space Charge Emittance / π mm-mrad Deviations caused by different space charge calculation methods 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) ε =.91 π mm mrad 9
11 1 x-emittance / π mm-mrad Influence of Diagnostic Doublecross (1) Cross without Mirror ( mm Beam Offset) ASTRA (Up to diagnostic cross) MAFIA (Bunch from ASTRA) ASTRA (Bunch from MAFIA) Zoom on next slide
12 Influence of Diagnostic Doublecross (1) Cross without Mirror ( mm Beam Offset) x-emittance / π mm-mrad ε = ASTRA (Up to diagnostic cross) MAFIA (Bunch from ASTRA) ASTRA (Bunch from MAFIA).79 π mm mrad
13 12 Model of Laser Mirror Influence of Laser Mirror Laser 12.5 mm - offset 18.5 mm x Beam z
14 13 x-emittance / π mm-mrad Influence of Diagnostic Doublecross (2) Cross with Mirror ( mm Beam Offset) ASTRA (Up to diagnostic cross) MAFIA (Bunch from ASTRA) ASTRA (Bunch from MAFIA)
15 14 x-emittance / π mm-mrad Influence of Diagnostic Doublecross (3) Cross with Mirror (1 mm Beam Offset) ASTRA (Up to diagnostic cross) MAFIA (Bunch from ASTRA) ASTRA (Bunch from MAFIA)
16 15 x-emittance / π mm-mrad Influence of Diagnostic Doublecross (4) Cross with Mirror (2 mm Beam Offset) ASTRA (Up to diagnostic cross) MAFIA (Bunch from ASTRA) ASTRA (Bunch from MAFIA)
17 16 x-emittance / π mm-mrad Influence of Diagnostic Doublecross (5) Cross with Mirror (3 mm Beam Offset) ASTRA (Up to diagnostic cross) MAFIA (Bunch from ASTRA) ASTRA (Bunch from MAFIA)
18 17 x-emittance / π mm-mrad Influence of Diagnostic Doublecross (6) Cross with Mirror (4 mm Beam Offset) ASTRA (Up to diagnostic cross) MAFIA (Bunch from ASTRA) ASTRA (Bunch from MAFIA)
19 Influence of Diagnostic Doublecross (7) Summary: Influence of Beam Offset on x-emittance x-emittance / π mm-mrad ? 2 mm 1 mm 3 mm mm ASTRA MAFIA (Bunch from ASTRA) ASTRA (Bunch from MAFIA) Diagnostic Cross, no Mirror 4 mm ε x =.655 π mm mrad 18
20 Influence of Diagnostic Doublecross (8) Summary: Influence of Beam Offset on y-emittance y-emittance / π mm-mrad ASTRA MAFIA (Bunch from ASTRA) ASTRA (Bunch from MAFIA) Diagnostic Cross, no Mirror 4 mm mm ε y =.295 π mm mrad 19
21 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) 2 Validated by reference runs (with and without Space Charge) Simulation results Optimal simulation parameters used (min. EMSY) Effect of the diagnostic doublecross on the transverse beam EMSY (1.618 m) is about.8 π mm mmrad Effect of the laser mirror on the transverse beam emittance depends on the beam offset 4 mm Offset causes emittance EMSY ε x =.655 π mm mrad ; ε y =.295 π mm mrad
22 Outline Wakefield Simulations for the PITZ-Injector (W. Ackermann, S. Setzer) Wakefields in the 3 rd Harmonic Structure (I. Zagorodnov) 21
23 22 Wake functions of the 3 rd Harmonic Section
24 23 r / cm Geometry z / cm
25 Long Range Wake Function W V / pc 5 Z T Ω 2 x σ = 1mm s / cm 14 i= π w () s = 2 θ () s Kicos( fi s) c f i /GHz K /(V/pC) i f i, GHz K /(V/pC) i f / GHz
26 25 LOLA Cavity LOLA RF deflecting cavity to measure the bunch length at the end of the linac σ y
27 Wake Function of the LOLA Cavity 26 W V / pc σ = 1mm short range long range s/ cm The short-range (dashed line) and long-range (dot-dashed line) longitudinal wake functions
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