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

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Bunch Compression – Harmonic structure for linearization On crest Off crest BC1 2.8 GHz 11.4 GHz Use of harmonic RF eliminates first order curvature Greatly improves final electron pulse shape Bunch shape with harmonic compression Bunch shape with no harmonic compression 20
Bunch Compression - Wakefields • When an electron bunch propagates through a LINAC it generates “wakefields”. • Transverse wakes can kick the tail of the bunch relative to the head. – This is a problem as it can cause emittance growth – Minimized by keeping beam centered in the structure • Longidudinal wakes decelerate the tail of the bunch. – This is actually an advantage: Can cancel the energy chirp put on the beam for compression. LCLS, After second bunch compressor ΔE/E = 0.4% LCLS at undulator ΔE/E = 0.06% Longitudinal wakes much smaller in superconducting linacs: Need to limit chirp <strong>and</strong> have larger bunch compressor Puts more stringent requirements on RF stability 21
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 and 8: Undulator Radiation Most high brigh
Page 9 and 10: Accelerators Synchrotron LINAC Acce
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: Energy Time Initial beam Gun 6 MeV
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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