Machine Parameters PETRA III (Design Values)

Electron energy

6.0 GeV

Circumference of the storage ring

2304 m

Number of buckets

3840

Number of bunches

960, 480, 60 or 40

Bunch separation

8 ns, 16 ns 128 ns or 192 ns

Electron beam current

100 mA (top-up mode)

Horizontal electron beam emittance

1.2 nmrad (rms)

Coupling factor

1%

Vertical electron beam emittance

0.012 nmrad (rms)

Electron beam energy spread

0.1% (rms)

Curvature radius of bending magnets

22.92 m (new part of the ring)

Magnetic field of bending magnet

0.873 T (new part of the ring)

Critical photon energy from bending magnets

20.9 keV (new part of the ring)

General Parameters

Energy:

6 GeV

Circumference:

2304 m

RF:

499,564 MHZ

Revolution Time:

7.685 μsec

Revolution Frequency:

130,1 kHz

Horizontal Emittance:

1.2 nmrad

Emittance Ratio:

1 %

Electron Beam Current:

100 mA

Electron Beam Charge:

769 nC

Number of electrons:

4,8 10^12

Electron Energy Loss per Turn from Dipoles:

1,149 MeV

Overall electron Energy Loss per Turn:

4,66 MeV

Radiation Power (Old Octant Dipoles):

52,3 kW

Radiation Power (New Octant Dipoles):

62,5 kW

Radiation Power (Damping Wigglers):

351 kW

Bunch Number (Multi Bunch Mode):

960, 480

Bunch Number (Time resolved Mode):

40, 60

Electron Beam Lifetime (Multi Bunch Mode):

13 h

Electron Beam Lifetime (Time resolved Mode):

1 h


Lattice Parameters

Number of Sectors:

8 Octants

Number of DBA Cells in new Octant:

9

DBA Cell Length:

23.012 m

FODO Cell Length:

14.400 m

Straight Sections for two canted 2m Undulators:

5

Straight Sections for 5m Undulators:

3

Straight Sections for 20m Undulator:

1


Beam Size Parameters

Horizontal Emittance:

1.2 nmrad

Vertical Emittance:

12 pmrad

Emittance Ratio:

1 %

Horizontal Beam Size at 5m Undulator (high ß Section):

141,5 μm

Vertical Beam Size at 5m Undulator (high ß Section):

4,9 μm

Horizontal Beam Size at 5m Undulator (low ß Section):

34.6 μm

Vertical Beam Size at 5m Undulator (low ß Section):

6.3 μm

Horizontal Beam Size at 10m Undulator:

141.6 μm

Vertical Beam Size at 10m Undulator:

6.6 μm

Horizontal Beam Divergence at 5m Undulator (high ß Section):

7.1 μrad

Vertical Beam Divergence at 5m Undulator (high ß Section):

2.1 μrad

Horizontal Beam Divergence at 5m Undulator (low ß Section):

28.9 μrad

Vertical Beam Divergence at 5m Undulator (low ß Section):

1.6 μrad

Horizontal Beam Divergence at 10m Undulator:

7.1 μrad

Vertical Beam Divergence at 10m Undulator:

1.5 μrad


Optics Parameters

Horizontal Tune:

37.26

Vertical Tune:

33.20

Momentum Compaction Factor:

1.20 10^-4

Horizontal Chromaticity:

-

Vertical Chromaticity:

-

Horizontal ß Function at 5m Undulator (high ß Section):

20.01 m/rad

Vertical ß Function at 5m Undulator (high ß Section):

2.36 m/rad

Horizontal ß Function at 5m Undulator (low ß Section):

1.20 m/rad

Vertical ß Function at 5m Undulator (low ß Section):

3.95 m/rad

Horizontal ß Function at 20m Undulator:

20.12 m/rad

Vertical ß Function at 20m Undulator:

3.39 m/rad

Horizontal Damping Time:

19.75 msec

Vertical Damping Time:

19.75 msec


RF Parameters

RF:

499.564 MHZ

Harmonic Number:

3840

Bunch Length (rms):

13,2 mm

Bunch Length (rms):

44 psec

Energy Spread (rms):

1,27 10^-3

Synchrotron Frequency:

6,37 kHz

Synchrotron Tune:

0,049

Longitudinal Damping Time:

9,84 msec


Vacuum Parameters

Vertical Undulator Chamber Aperture:

7 mm


Magnet Parameters

Dipoles in new Octant

Number:

18

Length:

1 m

Angle:

2,5 °

Radius:

22,918 m

Field:

0,8733 T

Field Error (delta B)/B:

0,0005

Critical Energy:

20.907 keV


Quadrupoles in new Octant

Number:

68 and 16

Length:

440 and 720 mm

Aperture:

35 mm

Gradient (max.):

21 T/m

k:

1,049 m^-2

Field Error (delta k)/k:

0,004


Dipoles in old Octants

Number:

196

Length:

5,378 m

Angle:

1,607 °

Radius:

191,73 m

Field:

0,10439 T

Field Error (delta B)/B:

0,0005

Critical Energy:

2,499 keV


Quadrupoles in old Octants

Length:

704 and 1042 mm

Aperture:

50 mm

Gradient (max.):

15 T/m

k:

0,749 m^-2

Field Error (delta k)/k:

0,004


Sextupoles in old Octants

Length:

286 mm

Aperture:

50 mm

Gradient:

300 T/m^2

m:

14,99 m^-3


Power Supply Parameters


Damping Wiggler Parameters

Number of Wigglers:

20

Maximal Field Strength:

1,5 T

Overall Length:

80 m

Radiation Power:

351 kW


Alignment Tolerances

Dipoles (new Octant)

in x:

100 μm

in z:

100 μm

in s:

500 μm


Quadrupoles (new Octant)

in x:

100 μm

in z:

100 μm

in s:

500 μm


Dipoles (old Octants)

in x:

250 μm

in z:

250 μm

in s:

500 μm


Quadrupoles (old Octants)

in x:

250 μm

in z:

250 μm

in s:

500 μm


Sextupoles (old Octants)

in x:

250 μm

in z:

250 μm

in s:

500 μm


BPMs

in x:

200 μm

in z:

200 μm

in s:

500 μm