1
Tessa CharlesAustralian Synchrotron / Monash University
Bunch Compression Schemes for X-band FELs
2
AXXS (Australian X-band X-ray Source)
• Upgrade the storage ring with an MBA lattice with e < 1 nm rad, in the existing tunnel with the same source points.
• Build a 3 GeV x-band linac to inject a low emittance beam into the storage ring.
• Use a second x-band linac to generate a 6 GeV beam for an XFEL.
CLIC Workshop 2015 – Tessa Charles - 2
• Comparison of bunch compression schemes– Magnetic Chicane (most FELs)– Double Achromat (e.g. MAX IV)– Harmonic Linearization – Optical Linearization
Today’s talk• Why these schemes• Preliminary simulation results
Bunch compressors we’re considering
CLIC Workshop 2015 – Tessa Charles - 3
Magnetic Chicane
R56 <0, T566 >0
δE
z
Chirped, linearized beam
Compressed beam
CLIC Workshop 2015 – Tessa Charles - 4
AXXS (Australian X-band X-ray Source) - Two Designs
1. Base line design: S-band with X-band structure for linearizing before BC1
2. Alternative design being considered: X-band the whole way
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
S-band~40 MV/m6 x 4 m
X-band~65 MV/m4 x 0.75 m
X-band~65 MV/m90 x 0.75 m
~150 m
GunInjector
BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band~65 MV/m10 x 0.75 m
X-band~65 MV/m4 x 0.75 m
X-band~65 MV/m90 x 0.75 m
~110 m
BC1
CLIC Workshop 2015 – Tessa Charles - 5
AXXS (Australian X-band X-ray Source)
CLIC Workshop 2015 – Tessa Charles - 6
How to linearize the longitudinal phase space?
Harmonic vs Optical
linearization
CLIC Workshop 2015 – Tessa Charles - 7
All X-band design
• One way to linearize the longitudinal phase - Optical linearization
CLIC Workshop 2015 – Tessa Charles - 8
Optical Linearization - Theoretical description
Optimal compression =>
When higher order terms are considered…
Bunch length after compression (to 1st order):
Y. Sun et al. Phys. Rev. ST Accel. Beams 17, 110703 (2014)
CLIC Workshop 2015 – Tessa Charles - 9
Optical Linearization - Choosing R56, T566 & U5666
CLIC Workshop 2015 – Tessa Charles - 10
Optical Linearization
Linac1 end /BC1 entrance
BC1 end
Linac2 end /BC2 entrance
BC2 end
Y. Sun et al. Phys. Rev. ST Accel. Beams 17, 110703 (2014)
CLIC Workshop 2015 – Tessa Charles - 11
Optical Linearization
Y. Sun et al. Phys. Rev. ST Accel. Beams 17, 110703 (2014)
T566 = 80 mm R56 = 17 mm
CLIC Workshop 2015 – Tessa Charles - 12
Positive R56 & positive T566 Self Linearizing
BC1: R56 = 3.23 cm T566 = 9.26 cm
BC2: R56 = 2.6 c m T566 = -17.8 cm
MAX IV
Detailed Design Report on the MAX IV Facility (2010)
CLIC Workshop 2015 – Tessa Charles - 13
Preliminary Simulation Results
Four simulations of linac compression schemes compared.
A work in progress
CLIC Workshop 2015 – Tessa Charles - 14
01 – BASE LINE DESIGNInc. 12 GHz linearizer
CLIC Workshop 2015 – Tessa Charles - 15
S band with X band structure for linearizing before BC1
Base line design (S-band w X-band linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
S-band~40 MV/m
X-band~65 MV/m
X-band~65 MV/m
X-band12 GHz
Initial beam parameters:
• mec (pCentral) = 257.65• Q = 2.5x10-10 C• Bunch length (rms) = 2.64 ps
Simulations based of Andrea Latina’s elegant files.
CLIC Workshop 2015 – Tessa Charles - 16
S band with X band structure for linearizing before BC1
Base line design (S-band w X-band linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
S-band~40 MV/m
X-band~65 MV/m
X-band~65 MV/m
X-band12 GHz
CLIC Workshop 2015 – Tessa Charles – 17
S band with X band structure for linearizing before BC1
Base line design (S-band w X-band linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
S-band~40 MV/m
X-band~65 MV/m
X-band~65 MV/m
X-band12 GHz
CLIC Workshop 2015 – Tessa Charles - 18
S band with X band structure for linearizing before BC1
Base line design (S-band w X-band linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
S-band~40 MV/m
X-band~65 MV/m
X-band~65 MV/m
X-band12 GHz
CLIC Workshop 2015 – Tessa Charles - 19
S band with X band structure for linearizing before BC1
Base line design (S-band w X-band linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
S-band~40 MV/m
X-band~65 MV/m
X-band~65 MV/m
X-band12 GHz
CLIC Workshop 2015 – Tessa Charles - 20
S band with X band structure for linearizing before BC1
Base line design (S-band w X-band linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
S-band~40 MV/m
X-band~65 MV/m
X-band~65 MV/m
X-band12 GHz
CLIC Workshop 2015 – Tessa Charles - 21
S band with X band structure for linearizing before BC1
Base line design (S-band w X-band linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
S-band~40 MV/m
X-band~65 MV/m
X-band~65 MV/m
X-band12 GHz
Compression Ratio after BC1: 8.34
CLIC Workshop 2015 – Tessa Charles - 22
S band with X band structure for linearizing before BC1
Base line design (S-band w X-band linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
S-band~40 MV/m
X-band~65 MV/m
X-band~65 MV/m
X-band12 GHz
CLIC Workshop 2015 – Tessa Charles - 23
S band with X band structure for linearizing before BC1
Base line design (S-band w X-band linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
S-band~40 MV/m
X-band~65 MV/m
X-band~65 MV/m
X-band12 GHz
CLIC Workshop 2015 – Tessa Charles - 24
Base line design (S-band w X-band linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
S-band~40 MV/m
X-band~65 MV/m
X-band~65 MV/m
X-band12 GHz
CLIC Workshop 2015 – Tessa Charles - 25
Base line design (S-band w X-band linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
S-band~40 MV/m
X-band~65 MV/m
X-band~65 MV/m
X-band12 GHz
CLIC Workshop 2015 – Tessa Charles - 26
Base line design (S-band w X-band linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
S-band~40 MV/m
X-band~65 MV/m
X-band~65 MV/m
X-band12 GHz
CLIC Workshop 2015 – Tessa Charles - 27
S band with X band structure for linearizing before BC1
Base line design (S-band w X-band linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
S-band~40 MV/m
X-band~65 MV/m
X-band~65 MV/m
X-band12 GHz
CLIC Workshop 2015 – Tessa Charles - 28
Base line design (S-band w X-band linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
S-band~40 MV/m
X-band~65 MV/m
X-band~65 MV/m
X-band12 GHz
End of linac: Compression Ratio: 100.80
CLIC Workshop 2015 – Tessa Charles - 29
Base line design (S-band w X-band linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
S-band~40 MV/m
X-band~65 MV/m
X-band~65 MV/m
X-band12 GHz
CLIC Workshop 2015 – Tessa Charles - 30
Base line design (S-band w X-band linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
S-band~40 MV/m
X-band~65 MV/m
X-band~65 MV/m
X-band12 GHz
CLIC Workshop 2015 – Tessa Charles - 31
02 – ALL X-BAND Without a harmonic linearizer
CLIC Workshop 2015 – Tessa Charles - 32
CLIC Workshop 2015 – Tessa Charles - 33
02 All X-band (w/o harmonic linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band~65 MV/m
X-band~65 MV/m
X-band~65 MV/m
02 All X-band (w/o harmonic linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band~65 MV/m
X-band~65 MV/m
X-band~65 MV/m
CLIC Workshop 2015 – Tessa Charles - 34
02 All X-band (w/o harmonic linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band~65 MV/m
X-band~65 MV/m
X-band~65 MV/m
CLIC Workshop 2015 – Tessa Charles - 35
02 All X-band (w/o harmonic linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band~65 MV/m
X-band~65 MV/m
X-band~65 MV/m
CLIC Workshop 2015 – Tessa Charles - 36
02 All X-band (w/o harmonic linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band~65 MV/m
X-band~65 MV/m
X-band~65 MV/m
CLIC Workshop 2015 – Tessa Charles - 37
02 All X-band (w/o harmonic linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band~65 MV/m
X-band~65 MV/m
X-band~65 MV/m
CLIC Workshop 2015 – Tessa Charles - 38
Compression Ratio after BC1: 9.35
02 All X-band (w/o harmonic linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band~65 MV/m
X-band~65 MV/m
X-band~65 MV/m
CLIC Workshop 2015 – Tessa Charles - 39
02 All X-band (w/o harmonic linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band~65 MV/m
X-band~65 MV/m
X-band~65 MV/m
CLIC Workshop 2015 – Tessa Charles - 40
02 All X-band (w/o harmonic linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band~65 MV/m
X-band~65 MV/m
X-band~65 MV/m
CLIC Workshop 2015 – Tessa Charles - 41
02 All X-band (w/o harmonic linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band~65 MV/m
X-band~65 MV/m
X-band~65 MV/m
CLIC Workshop 2015 – Tessa Charles - 42
02 All X-band (w/o harmonic linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band~65 MV/m
X-band~65 MV/m
X-band~65 MV/m
CLIC Workshop 2015 – Tessa Charles - 43
02 All X-band (w/o harmonic linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band~65 MV/m
X-band~65 MV/m
X-band~65 MV/m
CLIC Workshop 2015 – Tessa Charles - 44
02 All X-band (w/o harmonic linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band~65 MV/m
X-band~65 MV/m
X-band~65 MV/m
CLIC Workshop 2015 – Tessa Charles - 45
End of linac: Compression Ratio: 93.52
02 All X-band (w/o harmonic linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band~65 MV/m
X-band~65 MV/m
X-band~65 MV/m
CLIC Workshop 2015 – Tessa Charles - 46
02 All X-band (w/o harmonic linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band~65 MV/m
X-band~65 MV/m
X-band~65 MV/m
CLIC Workshop 2015 – Tessa Charles - 47
Optics not yet optimized
Compression Ratio: 93.52
02 All X-band (w/o harmonic linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band~65 MV/m
X-band~65 MV/m
X-band~65 MV/m
CLIC Workshop 2015 – Tessa Charles - 48
03 – ALL X-BAND Inc. 24 GHz linearizer
CLIC Workshop 2015 – Tessa Charles - 49
03 All X-band (24GHz linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band12 GHz
X-band~65 MV/m
X-band~65 MV/m
X-band24 GHz
CLIC Workshop 2015 – Tessa Charles - 50
03 All X-band (24GHz linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band12 GHz
X-band~65 MV/m
X-band~65 MV/m
X-band24 GHz
CLIC Workshop 2015 – Tessa Charles - 51
03 All X-band (24GHz linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band12 GHz
X-band~65 MV/m
X-band~65 MV/m
X-band24 GHz
CLIC Workshop 2015 – Tessa Charles - 52
03 All X-band (24GHz linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band12 GHz
X-band~65 MV/m
X-band~65 MV/m
X-band24 GHz
CLIC Workshop 2015 – Tessa Charles - 53
03 All X-band (24GHz linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band12 GHz
X-band~65 MV/m
X-band~65 MV/m
X-band24 GHz
CLIC Workshop 2015 – Tessa Charles - 54
CLIC Workshop 2015 – Tessa Charles - 55
Compression Ratio after BC1: 10.19
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band12 GHz
X-band~65 MV/m
X-band~65 MV/m
X-band24 GHz
03 All X-band (24GHz linearizer)
03 All X-band (24GHz linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band12 GHz
X-band~65 MV/m
X-band~65 MV/m
X-band24 GHz
CLIC Workshop 2015 – Tessa Charles - 56
03 All X-band (24GHz linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band12 GHz
X-band~65 MV/m
X-band~65 MV/m
X-band24 GHz
CLIC Workshop 2015 – Tessa Charles - 57
03 All X-band (24GHz linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band12 GHz
X-band~65 MV/m
X-band~65 MV/m
X-band24 GHz
CLIC Workshop 2015 – Tessa Charles - 58
03 All X-band (24GHz linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band12 GHz
X-band~65 MV/m
X-band~65 MV/m
X-band24 GHz
CLIC Workshop 2015 – Tessa Charles - 59
03 All X-band (24GHz linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band12 GHz
X-band~65 MV/m
X-band~65 MV/m
X-band24 GHz
CLIC Workshop 2015 – Tessa Charles - 60
03 All X-band (24GHz linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band12 GHz
X-band~65 MV/m
X-band~65 MV/m
X-band24 GHz
CLIC Workshop 2015 – Tessa Charles - 61
03 All X-band (24GHz linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band12 GHz
X-band~65 MV/m
X-band~65 MV/m
X-band24 GHz
End of linac:
Compression Ratio: 103.86
CLIC Workshop 2015 – Tessa Charles - 62
03 All X-band (24GHz linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band12 GHz
X-band~65 MV/m
X-band~65 MV/m
X-band24 GHz
Along the length of the linac
CLIC Workshop 2015 – Tessa Charles - 63
04 – ALL X-BAND Inc. 36 GHz linearizer
CLIC Workshop 2015 – Tessa Charles - 64
04 All X-band (36 GHz linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band12 GHz
X-band~65 MV/m
X-band~65 MV/m
X-band36 GHz
CLIC Workshop 2015 – Tessa Charles - 65
04 All X-band (36 GHz linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band12 GHz
X-band~65 MV/m
X-band~65 MV/m
X-band36 GHz
CLIC Workshop 2015 – Tessa Charles - 66
04 All X-band (36 GHz linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band12 GHz
X-band~65 MV/m
X-band~65 MV/m
X-band36 GHz
CLIC Workshop 2015 – Tessa Charles - 67
04 All X-band (36 GHz linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band12 GHz
X-band~65 MV/m
X-band~65 MV/m
X-band36 GHz
CLIC Workshop 2015 – Tessa Charles - 68
04 All X-band (36 GHz linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band12 GHz
X-band~65 MV/m
X-band~65 MV/m
X-band36 GHz
CLIC Workshop 2015 – Tessa Charles - 69
04 All X-band (36 GHz linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band12 GHz
X-band~65 MV/m
X-band~65 MV/m
X-band36 GHz
Compression Ratio after BC1: 52.65
CLIC Workshop 2015 – Tessa Charles - 70
04 All X-band (36 GHz linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band12 GHz
X-band~65 MV/m
X-band~65 MV/m
X-band36 GHz
CLIC Workshop 2015 – Tessa Charles - 71
04 All X-band (36 GHz linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band12 GHz
X-band~65 MV/m
X-band~65 MV/m
X-band36 GHz
CLIC Workshop 2015 – Tessa Charles - 72
04 All X-band (36 GHz linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band12 GHz
X-band~65 MV/m
X-band~65 MV/m
X-band36 GHz
CLIC Workshop 2015 – Tessa Charles - 73
04 All X-band (36 GHz linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band12 GHz
X-band~65 MV/m
X-band~65 MV/m
X-band36 GHz
CLIC Workshop 2015 – Tessa Charles - 74
04 All X-band (36 GHz linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band12 GHz
X-band~65 MV/m
X-band~65 MV/m
X-band36 GHz
CLIC Workshop 2015 – Tessa Charles - 75
04 All X-band (36 GHz linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band12 GHz
X-band~65 MV/m
X-band~65 MV/m
X-band36 GHz
CLIC Workshop 2015 – Tessa Charles - 76
End of linac:Compression Ratio: 110.98
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band12 GHz
X-band~65 MV/m
X-band~65 MV/m
X-band36 GHz
04 All X-band (36 GHz linearizer)
CLIC Workshop 2015 – Tessa Charles - 77
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band12 GHz
X-band~65 MV/m
X-band~65 MV/m
X-band36 GHz
Along the length of the linac:
04 All X-band (36 GHz linearizer)
CLIC Workshop 2015 – Tessa Charles - 78
04 All X-band (36 GHz linearizer)
Gun Injector BC1 BC2Dogleg
Linac2
UndulatorLinac
1
Experimental Station
X-band12 GHz
X-band~65 MV/m
X-band~65 MV/m
X-band36 GHz
Along the length of the linac:
CLIC Workshop 2015 – Tessa Charles - 79
Comparison of the 4 simulated scenarios
End of linac comparison
CLIC Workshop 2015 – Tessa Charles - 80
01 S-band w X-band linearizer (Base line) 02 all X-band w/o linearizer
03 all X-band w 24 GHz linearizer 04 all X-band w 36 GHz linearizer
Where to from here…
• Further optimization of chicane simulations and inclusions of additional effects (CSR) & optimize optics
• Look into beam parameters optimal for photon production
• Investigate optical linearization in chicanes
• Investigate optical linearization in double achromats
CLIC Workshop 2015 – Tessa Charles - 81
Thank you
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