Joe Frisch: Synchrotron radiation sources and free ... - Conferences

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XFEL Electron Beam Parameters • Energy: typically 1-20 GEV, beams are ultrarelativistic (γ>>1) • Energy spread typically < 0.1% (except in bunch compressors). • Bunch length: few femtoseconds to a few picoseconds (microns to millimeters) • Beam transverse sizes: ~100 microns • Emittance: Product of RMS size and uncorrelated RMS angular spread – ε x=π·δx·δx’, usually quoted in “pi millimeter milliradians”, or “microns”. – Invariant with linear focusing optics – Normalized emittance ε n= ε·γ is also invariant with acceleration. – Typical normalized emittances ~ 1um. – For FELs need emittance ≤ λ/(4π), • 1um emittance, gamma = 20,000 (10 GeV) -> 3Å Relativity • Lab frame – synchrotron beams are fairly long (several mm long, 100um wide). – FEL beams are ~spherical (30um long and wide). – FEL undulator is 100M long – Microbunching: 1Å bunches in a 50um transverse size beam (5x10 5 :1) (!!!) • Beam frame: (γ=10 3 -3x10 4 ) – Beams are much longer (~1M) than they are wide (~50um). – Undulator is ~3mm (shorter than the electron bunch!). – Microbunching is 3um in a 50um beam, 15:1, not so extreme. 8
Accelerators Synchrotron LINAC Accelerator Undulator Accelerator Accelerator Undulator Beam properties mostly determined by the injector. E-beam “thrown away” after undulator
Page 1 and 2: Synchrotron Radiation Sources and F
Page 3 and 4: X-ray Beam Parameters • Energy /
Page 5 and 6: Grazing incidence mirror Focusing X
Page 7: Undulator Radiation Most high brigh
Page 11 and 12: Light Source: Petra III at DESY •
Page 13 and 14: LINACS • Single pass devices •
Page 15 and 16: Electron Guns RF guns used at SLAC
Page 17 and 18: 100fs Room Temperature 200ns 10ms P
Page 19 and 20: Energy Time Initial beam Gun 6 MeV
Page 21 and 22: Bunch Compression - Wakefields •
Page 23 and 24: FELs: Gain and Coherent Emission
Page 25 and 26: Undulator as emission mechanism 25
Page 27 and 28: Self Amplified Spontaneous Emission
Page 29 and 30: � � � u p 2� � � 2 �
Page 31 and 32: Gain, Saturation and Taper LCLS Gai
Page 33 and 34: Seeding • FEL light is amplified
Page 35 and 36: Laser Seeding (ECHO) Laser fundamen
Page 37 and 38: Synchrotron Multi-User Capability S
Page 39 and 40: Future Light X-ray Sources • Most
Page 41 and 42: Low energy injector gun Recirculati
Page 43 and 44: Attosecond FELs • Operation at lo
Page 45 and 46: Laser-Plasma Accelerators - LBNL Po
Page 47 and 48: What isn’t covered here: • Almo
Page 49: Discussion • Imagine you want to

Joe Frisch: Synchrotron radiation sources and free ... - Conferences

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