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 EBS Parameters
EBS Parameters
The table below lays out the detailed parameters of the ESRF Extremely Brilliant Source.

Parameters 
ESRFEBS 
Lattice 
Energy [GeV] 
6 

Circumference [m] 
843.977 

Number of cells 
32 

Natural horizontal emittance [pm.rad] 
133 

Operational emittance (H/V) [pm] 
110/5 

Energy loss per turn [MeV] 
2.5 

Energy loss from IDs [MeV] 
0.5 

Horizontal tune 
76.21 

Vertical tune 
27.34 

Longitudinal tune 
0.00366 

Horizontal damping time [ms] 
8.76 

Vertical damping time [ms] 
13.4 

Longitudinal damping time [ms] 
9.13 

Horizontal natural chromaticity 
109 

Vertical natural chromaticity 
82 

Momentum compaction 
8.5E05 

Energy spread 
9.3E4 

Beam current (multibunch) [mA] 
200 

Horizontal emittance growth at 200mA [%] 
2.5 

Vertical emittance [pm.rad] 
5 

Bunch length [ps] 
13 

Lifetime [h] 
18 



RF 
RF Voltage [MV] 
6.5 

RF frequency [MHz] 
352.374 

Harmonic number 
992 

Synchrotron frequency [kHz] 
1.30 

Number of fivecell cavities 
0 

Number of monocell cavities 
14 

Total RF power (incl. 10% transmission loss and energy loss from IDs) [kW] 
1012 

RF power per cavity [kW] 
72 

Copper loss per cavity [kW] 
23 

Cavity coupling 
2.8 
ID source 


Undulator (U18) 
Period [mm] 
18 

Length [m] 
2 

Kmax 
1.68 

Minimum gap (IVU) [mm] 
6 

Minimum gap (U) [mm] 
11 



10keV 
Horizontal source size [µm] 
30.4 

Vertical source size [µm] 
5.11 

Horizontal beam divergence [µrad] 
7.38 

Vertical source divergence [µrad] 
6.1 

Brilliance [phot/s/0.1%/mm^2/mrad^2] 
6.6E+21 

On axis angular flux [ phot/s/0.1%/mrad^2] 
1.82E+19 



30keV 
Horizontal source size [µm] 
30.3 

Vertical source size [µm] 
4.2 

Horizontal beam divergence [µrad] 
6.3 

Vertical source divergence [µrad] 
4.7 

Brilliance [phot/s/0.1%/mm^2/mrad^2] 
3.56E+21 

On axis angular flux [ phot/s/0.1%/mrad^2] 
6.00E+18 



50keV 
Horizontal source size [µm] 
30.3 

Vertical source size [µm] 
4 

Horizontal beam divergence [µrad] 
6.1 

Vertical source divergence [µrad] 
4.5 

Brilliance [phot/s/0.1%/mm^2/mrad^2] 
1.37E+21 

On axis angular flux [ phot/s/0.1%/mrad^2] 
6.00E+18 

On axis angular flux [ phot/s/0.1%/mrad^2] 
1.96E+18 



BM source 
Magnetic field [T] 
0.47 to 1.1 

Horizontal beta at BM [m] 
1.88 

Horizontal dispersion [mm] 
18.48 

Vertical beta at BM [m] 
2.52 

Horizontal beam size at BM [µm] 
23.4 

Vertical beam size at BM [µm] 
3.55 

Horizontal beam divergence at BM [µrad] 
24.2 

Vertical beam divergence at BM [µrad] 
3.06 



Modes 


16bunch 
Beam current [mA] 
90 

Bunch intensity [mA] 
5.62 

Horizontal emittance growth at 5.62mA [%] 
15 

Vertical emittance [pm.rad] 
5 

Bunch length [ps] 
31 

Lifetime [h] 
1.75 

Energy spread 
0.0012 



4bunch 
Beam current [mA] 
40 

Bunch intensity [mA] 
10 

Horizontal emittance growth at 10mA [%] 
20 

Vertical emittance [pm.rad] 
20 

Bunch length [ps] 
37 

Lifetime [h] 
2.4 

Energy spread 
0.0015 