Subterahertz Radiation from Corrugated Pipe

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1 Subterahertz Radiation from Corrugated Pipe Self-Consistent Simulation of Longitudinal Dynamics Igor Zagorodnov Mini-workshop on THz option at PITZ (pithz) Zeuthen 22. September 215

2 Problem fomulation. Relativistic bunch. Igor Zagorodnov Mini-workshop on THz option at PITZ (pithz) 22. September 215 Seite 2

3 Problem fomulation. Low energy Igor Zagorodnov Mini-workshop on THz option at PITZ (pithz) 22. September 215 Seite 3

4 Problem fomulation. Geometry Pipe radius, mm 2 Pipe length, m.5-2 Corrugation depth, mm.5 Corrugation period, mm.4 Corrugation gap, mm.2 Gausiian bunch rms, mm.1-.3(*8) Igor Zagorodnov Mini-workshop on THz option at PITZ (pithz) 22. September 215 Seite 4

5 Code modification Wakefield code ECHO (with resistivity) Particle-in-Cell code ECHO-PIC (only longitudinal dynamics) Igor Zagorodnov Mini-workshop on THz option at PITZ (pithz) 22. September 215 Seite 5

6 Short bunch. High charge. High Energy Pipe length, m.5 Bunch enegry, MeV 14 Gausian bunch rms, mm.1 Charge, nc 1 Igor Zagorodnov Mini-workshop on THz option at PITZ (pithz) 22. September 215 Seite 6

7 Short bunch. High charge. High Energy 2 [ev/m] 5 x 16 1nC 14 GeV [A] σ.1 mm Igor Zagorodnov Mini-workshop on THz option at PITZ (pithz) 22. September 215 Seite 7

8 Short bunch. High charge. High Energy 1nC 14 GeV σ.1 mm [MeV] [mj] [m] Igor Zagorodnov Mini-workshop on THz option at PITZ (pithz) 22. September 215 Seite 8

9 Short bunch. High charge. Low Energy Pipe length, m.5 Bunch enegry, MeV 5-2 Gausian bunch rms, mm.1 Charge, nc 1 Igor Zagorodnov Mini-workshop on THz option at PITZ (pithz) 22. September 215 Seite 9

10 Short bunch. High charge. Low Energy 1nC σ.1 mm 2 MeV 1 MeV 5 MeV [mj] [m] [m] [m] Igor Zagorodnov Mini-workshop on THz option at PITZ (pithz) 22. September 215 Seite 1

11 Short bunch. High charge. Low Energy 1nC σ.1 mm 12 A [ev] 4 x MeV 1 x 16 5 MeV -1 [A] Igor Zagorodnov Mini-workshop on THz option at PITZ (pithz) 22. September 215 Seite 11

12 Short bunch. High charge. Low Energy Longitudinal electric field component 1nC σ.1 mm 1 MeV.3 THz 5 MeV Igor Zagorodnov Mini-workshop on THz option at PITZ (pithz) 22. September 215 Seite 12

13 Short bunch. Low charge. Low Energy Pipe length, m.5 Bunch enegry, MeV 5-2 Gausian bunch rms, mm.1 Charge, nc.4 Igor Zagorodnov Mini-workshop on THz option at PITZ (pithz) 22. September 215 Seite 13

14 Short bunch. Low charge. Low Energy 4 pc σ.1 mm 48 A 2.5 x [mj] 2 MeV 2.2 µj 2.5 x MeV [mj] 2.5 x MeV [mj] [m] [m] [m] Igor Zagorodnov Mini-workshop on THz option at PITZ (pithz) 22. September 215 Seite 14

15 Short bunch. Low charge. Low Energy 4 pc σ.1 mm 48 A [ev] 2 x MeV 2 x MeV * [A] A Igor Zagorodnov Mini-workshop on THz option at PITZ (pithz) 22. September 215 Seite 15

16 Short bunch. Low charge. Low Energy Longitudinal electric field component 1 MeV 5 MeV.3 THz Igor Zagorodnov Mini-workshop on THz option at PITZ (pithz) 22. September 215 Seite 16

17 Middle bunch. Middle charge. Low Energy Pipe length, m.5 Bunch enegry, MeV 1 Gausian bunch rms, mm.3 Charge, nc.12 Igor Zagorodnov Mini-workshop on THz option at PITZ (pithz) 22. September 215 Seite 17

18 Middle bunch. Middle charge. Low Energy 1 x [mj] 12 pc σ.3 mm 1 MeV 1 x 15 [ev] 48 A 6.55 µj [m] [A] 48 A Igor Zagorodnov Mini-workshop on THz option at PITZ (pithz) 22. September 215 Seite 18

19 Middle bunch. Middle charge. Low Energy Longitudinal electric field component.3 THz Igor Zagorodnov Mini-workshop on THz option at PITZ (pithz) 22. September 215 Seite 19

20 Premodulated bunch (from M. Krasilnikov) no Lyot filter Lyot: 6 mm YLF Lyot: 16 mm YLF Lyot: 4 mm YVO 4 FWHM = 2.5 ps FWHM = 4 ps FWHM = 7 ps FWHM ~ 16 ps without shaper 2 5 ps 2 5 ps 2 5 ps 2 5 ps edges ~ 2ps edges ~ 3ps edges ~ 6 ps ~ 14 ps with shaper (13 crystals) 2 4 ps ~ 2 3 ps ~ 19 ps 2 5 ps 2 5 ps 2 5 ps 2 5 ps Edges of the flat-top pulses are slightly shorter than FWHM of the Gaussian pulse (measured without shaper) Smoothening of the Modulations in the flat-top region of the pulse I. Will, G. Klemz Increasing the flexibility in pulse shape of a Yb:YAG photocathode laser Igor Zagorodnov Mini-workshop on THz option at PITZ (pithz) 22. September 215 Seite 2

21 Premodulated bunch. 6 microbunches Pipe length, m.5 Bunch enegry, MeV 5 Gausian bunch rms, mm.3*6 Charge, nc.12*6 [A] Igor Zagorodnov Mini-workshop on THz option at PITZ (pithz) 22. September 215 Seite 21

22 Premodulated bunch. 6 microbunches MeV 6 12 pc [mj] 5 x 15 [ev] 48 A [A] σ.3 mm [m] Microbunching spacing.93 mm Igor Zagorodnov Mini-workshop on THz option at PITZ (pithz) 22. September 215 Seite 22

23 Premodulated bunch. 6 microbunches Longitudinal electric field component.35 THz 5 MeV Igor Zagorodnov Mini-workshop on THz option at PITZ (pithz) 22. September 215 Seite 23

24 Premodulated bunch. 8 microbunches.15.1 [mj] 5 MeV.35 THz 14 µj.5 2MeV.3THz Microbunching spacing.93 mm [m] Igor Zagorodnov Mini-workshop on THz option at PITZ (pithz) 22. September 215 Seite 24

25 Premodulated bunch. 8 microbunches Pipe length, m Bunch enegry, MeV 5 Gausian bunch rms, mm.3*8 Charge, nc.12*8 [A] Igor Zagorodnov Mini-workshop on THz option at PITZ (pithz) 22. September 215 Seite 25

26 Premodulated bunch. 8 microbunches 2 MeV [ev] [ev] 5 MeV [A] [A] Microbunching spacing.93 mm Igor Zagorodnov Mini-workshop on THz option at PITZ (pithz) 22. September 215 Seite 26

27 Premodulated bunch. 8 microbunches [mj] MeV.35 THz 145 µj Microbunching spacing.88mm [m] Igor Zagorodnov Mini-workshop on THz option at PITZ (pithz) 22. September 215 Seite 27

28 Premodulated bunch. 8 microbunches Pipe length, m 2 Bunch enegry, MeV 8 Gausian bunch rms, mm.3*8 Charge, nc.12*8 Igor Zagorodnov Mini-workshop on THz option at PITZ (pithz) 22. September 215 Seite 28

29 Premodulated bunch. 8 microbunches [mj] 8 MeV.33 THz 41 µj MeV.3 THz 125 µj Microbunching spacing.93 mm [m] Igor Zagorodnov Mini-workshop on THz option at PITZ (pithz) 22. September 215 Seite 29

30 Premodulated bunch. 8 microbunches Longitudinal electric field component.33 THz 8 MeV Igor Zagorodnov Mini-workshop on THz option at PITZ (pithz) 22. September 215 Seite 3

31 Summary Charge, [pc] Beam energy, [MeV] RMS length, Number of bunches Pipe Length [m] Field energy, [uj] Frequency, [THz] * * * Igor Zagorodnov Mini-workshop on THz option at PITZ (pithz) 22. September 215 Seite 31

32 Summary To consider: - transverse dynamics, - tapering, resonance condition, - resistivity (already implemented in code), - rectangular pipe (wakefield code available), - start from shot noise, - start with short driving bunch, - optimal prebunching, optimal energy. Igor Zagorodnov Mini-workshop on THz option at PITZ (pithz) 22. September 215 Seite 32

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