1. Singel pass FELs for ERL

2. X-RAY FELS BASED ON ERL FACILITIES A. Meseck, C. Mayes F. Löhl G. Hoffstätter

3. Common knowledge: ERL can drive FEL-Oscillators If we can compress the bunch about a factor of 10 and assume no-recovery: Cornell ERL can drive: - a SASE-FEL in hard x-ray regime by utilizing a modified current enhancement technique. - a high power radiation of soft x-ray FEL: Using the fresh bunch technique, a radiator following a regular EEHG FEL can deliver soft X-rays. - a high power radiation of hard x-ray FEL: Using an oscillator as the radiator in an Echo enabled FEL, a following radiator can deliver hard x-rays.

4. Calculated Electron beam (Chris) bunch charge:0.1nC bunch length:60µm Beam energy:5GeV (chirped) Energy spread:0.32MeV Normalized emittance:0.6/0.3µm 200A

5. Cornell ERL can drive a SASE-FEL in hard x-ray regime by utilizing a modified current enhancement technique. current enhancement

6. Helical Undulator + Phase shifter Nonlinear Harmonic Generation fundamental 3 rd harmonic

9. FELProperties ( saturation length: 48m) Photon Energy [keV]: 2.75667 Pulse Energy [mJ]: 0.00563476 # Photons: 1.27753e+10 Effective Peak Power [GW]: 0.0301728 RMS Pulse Length [fs]: 74.5023 RMS Radius [micron]: 54.8423 RMS Divergence Angle [micro-rad]: 6.99564 RMS Bandwidth [%]: 0.11741 Peak Spectral Flux [#ph/pulse/0.1% bw]: 1.08809e+10 Peak Brightness [#ph/s/mm^2/mrad^2/0.1% bw]: 1.60004e+28 Avg Brightness per pulse [#h/s/mm^2/mrad^2/0.1% bw]: 2.98806e+15

10. Using the fresh bunch technique, a radiator following a regular EEHG FEL can deliver high power radiation of soft x-rays.

12. FELProperties (Saturation length: 38m) Photon Energy [keV]: 0.372187 Pulse Energy [mJ]: 0.0102175 # Photons: 1.71579e+11 Effective Peak Power [GW]: 0.220669 RMS Pulse Length [fs]: 18.472 RMS Radius [micron]: 74.8133 RMS Divergence Angle [micro-rad]: 11.1797 RMS Bandwidth [%]:0.0201966 Peak Spectral Flux [#ph/pulse/0.1% bw]: 8.49541e+11 Peak Brightness [#ph/s/mm^2/mrad^2/0.1% bw]: 1.06017e+30 Avg Brightness per pulse [#ph/s/mm^2/mrad^2/0.1% bw]:4.90884e+16

13. Using an oscillator as the radiator in an Echo enabled FEL, a following radiator can deliver radiation pulses of hard x-rays. The stored power in the resonator. It has to be filled with as much radiation as necessary to ensure that the undisturbed electrons modulated in the oscillator will emit enough power to replace the losses in the actual pass. P [W]

15. FELProperties (Saturation length: 10m) Photon Energy [keV]: 3.19387 Pulse Energy [mJ]: 0.000352517 # Photons: 6.89831e+08 Effective Peak Power [GW]: 0.00127671 RMS Pulse Length [fs]: 110.153 RMS Radius [micron]: 50.5324 RMS Divergence Angle [micro-rad]: 4.17639 RMS Bandwidth [%]: 0.0195302 Peak Spectral Flux [#ph/pulse/0.1% bw]: 3.53212e+09 Peak Brightness [#ph/s/mm^2/mrad^2/0.1% bw]: 1.16096e+28 Avg Brightness per pulse [#ph/s/mm^2/mrad^2/0.1% bw]: 3.20557e+15