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XFEL Technical Information Photon Beam Parameter  · 

Beam Parameters of FEL Radiation

Performance Goals for SASE FEL Radiation

The parameters on this page are extracted from the XFEL Supplement to the TESLA TDR published in Oct. 2002.

Parameter

 

Value

 
 

SASE 1

SASE 2

SASE 3

photon energy [keV]

12.4 - 4.0

12.4 - 3.1

3.1 - 0.2

wavelength [nm]

0.1 - 0.31

0.1 - 0.4

0.4 - 6.4

peak power [GW]

24

22

100 - 135

average power [W]

72

66

300 - 800

photon beam size (FWHM) [µm]

110

110

65 - 95

photon beam divergence (FWHM) [µrad]

0.8

0.8

3 - 27

bandwidth (FWHM) [%]

0.09

0.08

0.28 - 0.73

coherence time [fs]

0.3

0.3

0.3 - 1.9

pulse duration (FWHM) [fs]

100

100

100

number photon per pulse [x10^12]

1.2

1.1

20-430

average flux of photons [x10^16/s]

3.6

3.3

60-2600

peak brillance [x10^33]*

5.4

5.4

1.7 - 0.06

average brillance [x10^25]*

1.6

1.6

0.52 - 0.03

* in units of photons/(s mrad^2 mm^2 0.1% bandwidth)

Photon Beam Parameters for Spontaneous Synchrotron Radiation

Parameter

 

Value

 

photon energy [keV]

20

50

200

peak power [MW]

15

126

81

average power [W]

59

504

324

photon beam size (FWHM) [µm]

84

83

83

photon beam divergence (FWHM) [µrad]

3.5

2.9

2.5

pulse duration (FWHM) [fs]

100

100

100

number photon per pulse [x10^8]

3.3

2.8

1.1

average flux of photons [x10^13/s/0.1%]

1.3

1.1

4.4

peak brillance [x10^28]*

1.4

2.9

1.4

average brillance [10^19]*

5.8

1.2

56

* in units of photons/(s mrad^2 mm^2 0.1% bandwidth)

 

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