RESEARCH ON OUR SITE
 
 

Optics

Sources & accelerators Contents > Accelerators > Optics
Structure : modified Chasman-Green (Double Bend)

Nominal energy (GeV)

E

2.75

Circumference (m)

C

354.097

Revolution period (ns) / frequency(MHz)

 

1 181.40 / 0.84664

Nb of cells ; nb of superperiods

Nb x straight section length (m)

 

 

16 ; 4

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

Betatron tunes

νx ; νz

18.2 ; 10.3

Momentum compaction

α1

α2

4.38 10-4

4.49 10-3

Energy dispersion

σE/E

1.016 10-3

Damping time (ms)

τs

τx = τz

3.27

6.56

Emittance (nm.rad)

εx

3.74

Radiation loss per turn* (keV)

 

944 + 184 (IDs) + 22 (paras. modes)

Total power loss (500 mA)* (kW)

 

575

Bunch length** (ps)

σl

13.8

bx (m) maximum value

 

27

bz (m) maximum value

 

17

Dispersion function maximum value (m)

  ηx

0.28

Vacuum vessel aperture except IDs (mm)

H x V

70 x 25

*Phase 2: Estimated value for 21 insertion devices

** Phase 2: Natural bunch length for a RF voltage of 4.0 MV Optimised value versus Touschek lifetime criterium, corresponding to an energy acceptance of 5.23%.

Chromaticity correction and dynamic aperture

Normalized natural chromaticity

- 2.88 ; - 2.21

Nb of sextupoles/nb of families

120/10

Half on-momentum dynamic aperture (H)

- 34 ; + 30

Half on-momentum dynamic aperture (V)

± 25

Lattice
 
 
 Des sections droites supplémentaires sont créées en déplaçant les deux quadrupôles doublets situés entre les deux aimants de courbure de la cellule DB.
Accueil