Parameters of the accelerators / storage ring

The storage ring characteristics condition part of the performance of the whole facility. SOLEIL storage ring is extremely compact and however reserves a very large part to the most powerful Light sources. It was also designed to satisfy all categories of users, first by the choice of the nominal energy for machine operation, but also thanks to the five possible operating modes.

 

Main parameters of the storage ring

Magnetic structure  

Modified Chassman-Green Double Bend Achromat)
Energy (GeV) E 2.75

Circumference (m)

Revolution period (ns)

Revolution frequency (MHz)

  

354.097

1 181.40

0.84664

Number of cells; number of superperiods
Number x length of straight sections (m) 

  

16. 4
4 x 12 m + 12 x 7 m + 8 x 3.8 m

Betatron tunes
Chromaticities H ; V

vx; vz
ζx; ζz

18.18; 10.23
1.4; 2.3

Momentum compaction factor
1st and 2nd order

α1
α2

4.16 10-4
4.50 10-3
Energy dispersion  σE/E 1.025 10-3
Damping dispersion (ms) 

Ts

Tx = Tz

3.27

6.56

Horizontal emittance (nm.rad)

Controlled coupling (%)

 εx

3.9

1.0

Radiation loss per turn (keV)

  

944 (dipoles) + 205 ( 25 insertions)
+ 22 (parasitic modes)

Total power loss  (kW)
for 500 mA and 25 insertion devices

   585

RF voltage (MV)

Number of cavities

  

2.9

4

Filling modes
Maximum stored current (mA) / Number of bunches x bunch current (mA)

                                                                                          Uniform
                                                                                          Hybrid
                                                                                          8 bunches
                                                                                          1 bunch

  





500 (416 x 1.2)
450 (312 x 1.42 + 1 x 5)
110 ( 8 x 13.75)
20 (1 x 20.0)
Bunch length RMS (ps)  1.3 mA ; 5 mA   18; 25
Average Pressure (mbar) at 450 mA   4.0 10-10

Lifetime (h)  450 mA in hybrid filling mode
for the machine without insertion devices

   18

Injection efficiency (%)
for the machine without insertion devices

   95