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

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Brilliance Comparison X10 8 X10 5 28
� � � u p 2� � � 2 � � 1� K 2 2 � � � � Undulators for XFELs • Alternating magnetic field, wavelength of a few cm. – Shorter wavelength allows operation with lower energy electron beams (if they have enough brightness) – Short wavelength undulators require narrow gaps -> alignment <strong>and</strong> wakefield problems • For XFELs, generally want as high a “K” as practical – Provides higher gain <strong>and</strong> efficiency – High K -> higher e-beam energy • Very tight tolerances: ~10 micron orbit in LCLS Beam Based Alignment of LCLS undulator H. Loos Fixed Gap Undulator: Simple, high fields, good tolerances. Need to change beam energy to change wavelength Adjustable gap Undulator: Can change wavelength with fixed e-beam energy: allows multiple undulators fed from a single linac. K � eB�u 2�m c LCLS fixed-gap undulator LCLS_II Test variable gap undulator 29 e
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 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: Self Amplified Spontaneous Emission
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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