LCLS Parameters

Undulator Type

planar NdFe:B

planar NdFe:B

Wavelength

15

1.5

Å

Norm. RMS Emittance

1.2

1.2

mm mrad

Peak Current

3.4

3.4

kA

Electron Energy E

4.54

14.35

GeV

Average b -Function

7.3

18

m/rad

s _E/E (X-rays)

0.47

0.13

%

Pulse Duration (FWHM)

230

230

fs

Pulses per macropulse

1

1

Repetition Rate

120

120

Hz

Undulator Period

3.0

3.0

cm

Peak Field

1.32

1.32

T

FEL parameter r

1.45

0.50

10^-3

Power Gain Length

1.3

4.7

m

Saturation Length

27

86

m

Peak Power

19

8

GW

Average Power

0.61

0.25

W

Coherent Energy per Pulse

2.6

2.3

mJ

Coherent Photons per Pulse

27.9

1.1

10¹²

Peak Brightness

0.64

8.5

10³² **

Average Brightness

0.2

2.7

10²²**

Transverse RMS Photon Beam Size

40

33

µm

Transverse RMS Photon Beam Divergence

3.4

0.42

µrad