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

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Short Wavelength Limits • Emission wavelength scales as γ 2 , but gain tends to decrease with wavelength. • Above ~20 KeV, an additional effect decreases FEL gain: The energy spread from statistics in spontaneous emission increases the beam energy spread and reduces the gain further. • For LCLS beam parameters, 25 KeV seems practical • Design studies with low emittance beams suggest energies up to ~100 KeV may be possible. • High energy X-rays put tight constraints on beam brightness and undulator quality FELs above 25 KeV are likely to be very large facilities, need to understand the science case Calculated gain length and power for 25KeV FEL using LCLS like beam parameters 40
Low energy injector gun Recirculating LINAC Accelerate on first pass Decelerate / recover energy on second pass dump FEL at TJNAL produces 14KW at 1.6um, 1KW at 250nm For an XFEL, Beam Dynamics issues with 2 very different energy beams in the same linac are challenging! Superconducting LINAC, usually operating CW mode Energy recovery from beam allows much higher average current than for a single-pass linac. 41
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 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: Future Light X-ray Sources • Most
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

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