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Beamline
Page 4 of 5
Brightness, coherent flux and harmonics
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The brightness and coherent flux of the undulator source at 0.1% of the bandwidth are reported in the following table. One should keep in mind that the transmission of the beamline is of the order of 1% which was also calculated theoretically and confirmed experimentally. The transmission is maximised at around 500eV for the 600l/mm grating and at 700eV for 1200l/mm grating. Relative transmissions at different photon energies are shown in the figure where the 2.0 GeV spectra for different undulator gaps and harmonics and differnt monocromator gratings are plotted.
|
Wavelength (nm) |
3.1 |
2.1 |
1.5 |
|
Photon energy (eV) |
400 |
600 |
800 |
Brightness
[ph s-1 mm-2 mrad-2(0.1%BW)-1] |
4x1018 |
4x1018 |
4x1018 |
|
Coherent flux [ph s-1 (0.1%BW)-1] |
4x1013 |
2x1013 |
1.5x1013 |
|
Coherent beam (%) |
1 |
0.5 |
0.3 |
|
|
Last Updated on Monday, 23 March 2020 16:13
