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Simulation for TW FEL @ LCLS-II. Tor’s question on the undulator length in the TW FEL senario SASE FEL undulator length 9, 10, and 11: 9 – 38.72 m, 10 – 43.136 m, 11 – 47.552 m FEL energy 8, 13, and 18 keV - PowerPoint PPT Presentation
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SIMULATION FOR TW FEL @ LCLS-II
Tor’s question on the undulator length in the TW FEL senario
SASE FEL undulator length 9, 10, and 11:9 – 38.72 m, 10 – 43.136 m, 11 – 47.552 m
FEL energy 8, 13, and 18 keV
LCLS-II Undulator: period 3.2 cm, each undulator magnetic section is 3.4 m, and break length is 1 mElectron bunch
4 kA peak current, 0.3 mm-mrad emittance, and 1.3 MeV slice energy spread13 & 18 keV FEL: electron bunch temporal profile: ideal flattop 8 keV FEL: electron bunch temporal profile: start-to-end
FEL and Beam Phys. Dept. (ARD/SLAC), J. Wu, [email protected]
SIMULATION FOR TW FEL @ LCLS-II
8 keV FEL through a single crystal 0.1 mm thick C(400) with 1.2E-05 (FWHM) bandwidthThe FEL centered @ 1.50205 Å
FEL and Beam Phys. Dept. (ARD/SLAC), J. Wu, [email protected]
SASE S-2-E beam, horns lase strongly
SIMULATION FOR TW FEL @ LCLS-II
8 keV FEL through a single crystal 0.1 mm thick C(400): 1.2E-05 (FWHM) bandwidth with Bragg angle 57o
The FEL centered @ 1.50205 Å
FEL and Beam Phys. Dept. (ARD/SLAC), J. Wu, [email protected]
Seed
SIMULATION FOR TW FEL @ LCLS-II
8 keV FEL through an 1.2E-05 (FWHM) bandwidthThe FEL centered @ 1.50205 Å
FEL and Beam Phys. Dept. (ARD/SLAC), J. Wu, [email protected]
Seeded TW: Taper profile for 5 MW seed
SIMULATION FOR TW FEL @ LCLS-II
SASE FEL in the seed bandwidth: Gamma-distribution
FEL and Beam Phys. Dept. (ARD/SLAC), J. Wu, [email protected]
Seeded TW
EEM
EEE
MMEp
MM
exp1)(
)(1
SIMULATION FOR TW FEL @ LCLS-II
13 keV FEL through a single crystal 0.1 mm thick C(400) with 1.2E-05 (FWHM) bandwidthThe FEL centered @ 0.9547 Å
FEL and Beam Phys. Dept. (ARD/SLAC), J. Wu, [email protected]
SASE
SIMULATION FOR TW FEL @ LCLS-II
13 keV FEL through a single crystal 0.1 mm thick C(400): 1.2E-05 (FWHM) bandwidth with Bragg angle 32o
The FEL centered @ 0.9547 Å
FEL and Beam Phys. Dept. (ARD/SLAC), J. Wu, [email protected]
Seed
SIMULATION FOR TW FEL @ LCLS-II
13 keV FEL through a 1.2E-05 (FWHM) bandwidthThe FEL centered @ 0.9547 Å
FEL and Beam Phys. Dept. (ARD/SLAC), J. Wu, [email protected]
Seeded TW: Taper profile for 1 MW seed
SIMULATION FOR TW FEL @ LCLS-II
SASE FEL in the seed bandwidth: Gamma-distribution
FEL and Beam Phys. Dept. (ARD/SLAC), J. Wu, [email protected]
Seeded TW
EEM
EEE
MMEp
MM
exp1)(
)(1
Seeded TW: Taper profile for 1 MW seed
SIMULATION FOR TW FEL @ LCLS-II
18 keV FEL through a single crystal 0.1 mm thick C(400) with 2.5E-05 (FWHM) bandwidthThe FEL centered @ 0.6898 Å
FEL and Beam Phys. Dept. (ARD/SLAC), J. Wu, [email protected]
SASE
SIMULATION FOR TW FEL @ LCLS-II
18 keV FEL through a single crystal 0.1 mm thick C(400): 2.5E-05 (FWHM) bandwidth with Bragg angle 23o
The FEL centered @ 0.6898 Å
FEL and Beam Phys. Dept. (ARD/SLAC), J. Wu, [email protected]
Seed
Need be improved, but electron beam will determine
Seeded TW: Taper profile for 1 MW seed
SIMULATION FOR TW FEL @ LCLS-II
18 keV FEL through a 2.5E-05 (FWHM) bandwidthThe FEL centered @ 0.6898 Å
FEL and Beam Phys. Dept. (ARD/SLAC), J. Wu, [email protected]
SIMULATION FOR TW FEL @ LCLS-II
SASE FEL in the seed bandwidth: Gamma-distribution
FEL and Beam Phys. Dept. (ARD/SLAC), J. Wu, [email protected]
EEM
EEE
MMEp
MM
exp1)(
)(1
Seeded TW: Taper profile for 1 MW seed
SIMULATION FOR TW FEL @ LCLS-II
Fundamental 6 keV 3rd harmonic @ 18 keV (in progress), but let us look at 8 keV case
FEL and Beam Phys. Dept. (ARD/SLAC), J. Wu, [email protected]
8 keV: ideal (blue)
ideal 3rd harmonic (x 30) (red)
start-to-end (green)
SIMULATION FOR TW FEL @ LCLS-II
8 vs 13, ideal vs s-2-e
8 keV: ideal (blue) start-to-end (green)
13 keV: ideal (red)
FEL and Beam Phys. Dept. (ARD/SLAC), J. Wu, [email protected]
SIMULATION FOR TW FEL @ LCLS-II
Summary
The next episode:Optimize for 150 m long TW undulatorAny optimization on the break length between the undulator sections
FEL and Beam Phys. Dept. (ARD/SLAC), J. Wu, [email protected]
FEL power (keV)
SASEUndulator
Length (m)
TWUndulator
Length (m)
Seed power (MW)
Power @ 100 m
± rms (TW)
Power @ 150 m
± rms (TW)
Power @ 200 m
± rms (TW)
8 39 200 5 0.815 ± 0.048
1.204 ± 0.091
1.245 ± 0.097
13 43 200 1 0.395 ± 0.039
0.870 ± 0.095
1.305 ± 0.155
18 48 200 1 0.189 ± 0.002
0.495 ± 0.010
0.673 ± 0.022
