Singel pass FELs for ERL. X-RAY FELS BASED ON ERL FACILITIES A. Meseck, C. Mayes F. Löhl G. Hoffstätter.

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Presentation transcript:

Singel pass FELs for ERL

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

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.

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

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

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

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

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

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

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]

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