DORIS

The 4.5 GeV storage ring DORIS III at DESY in Hamburg is a dedicated synchrotron radiation source with 9 wiggler/undulator insertion devices and several dipole beamlines. In total there are 36 beamline stations. The stored current is 140 mA of positrons in 5 bunches with a typical lifetime of 10 to 18 hours. The radiation in the extreme ultraviolet and x-ray regime is used in a broad range of applications from biology and chemistry to material science.

 

Energy

4.45

GeV

Beam Current

140

mA

Circumference

289.193

m

Harmonic Number

482

 

revolution frequency

1036652.49

Hz

Hor. Beam Emittance

410

nm rad

Vert. Beam Emittance

12

nm rad

Qx

7.18

 

Qz

4.74

 

fs

42

kHz

Rel. Energy Spread

0.11

%

Bunch Length (1σ)

19.5

mm

Momentum Compaction

0.015

 

Hor. Damping Time

2.6

msec

Long. Damping Time

1.2

msec

Mean Beta-X

9.6

m

Mean Beta-Z

13.0

m

Energy Loss p Turn

3.466

MeV

RF Frequency

499 666 500

Hz

RF Voltage

7.2

MV

synchr. phase

25.6

degree

Bending Radius

12.18

m

critical energy (bending)

16.0

keV