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Photon Source Parameters Print

Summary Graph of Brightness Curves for All Insertion Devices

 

Insertion Device and Bend Magnet Parameters


The ALS has four elliptically polarizing undulators, two in straight 4 and two in straight 11. All are arranged with chicanes so that two such devices can be installed to feed two independent beamlines. They can be used in a variety of polarization modes, including circular, elliptical, horizontal, and vertical. These modes can be chosen by appropriate phasing of the magnet rows. The brightness and flux curves below are shown for horizontal and circular polarization. Curves for elliptical and vertical polarization are similar to the horizontal polarization curve, but the minimum photon energy is higher.

Note: Brightness and flux were calculated at a machine energy of 1.9 GeV, 500 mA current, vertical emittance of 5x10-11 m·rad, horizontal emittance of 6.3x10-9 m·rad, and lattice parameters as listed in the Storage Ring Parameters.

 

Insertion Device Parameters

 

Device Beamline Energy Range (at 1.9 GeV) Period Length No. of Periods Operating Gap Range Effective Field Range
U30 Undulator 6.0.1 6.0.2 120-5000 eV
4000-11000 eVd		 3.0 cm 50 0.55-2.7 cm 1.5-0.13 T
U50 Undulator 8.0.1 80-3000 eV 5.0 cm 89 1.4-4.5 cm 0.85-0.10 T
U50 Undulator 7.0.1 80-3000 eV 5.0 cm 89 1.4-4.5 cm 0.85-0.10 T
U80 Undulator 12.0.1 20-1900 eV 8.0 cm 55 2.47-8.3 cm 0.80-0.07 T
U100 Undulator 9.0.1 8-1500 eV 10.0 cm 43 2.27-11.6 cm 0.98-0.05 T
U100 Undulator 10.0.1 12-1500 eV 10.0 cm 43 2.31-11.6 cm 0.80-0.05 T
EPU50 Elliptical Polarization Undulator 4.0.2 73-3000 eVa 5.0 cm 37 1.40-5.5 cm 0.86-0.10 Tb
0.58-0.10 Tc
EPU50
Elliptical Polarization Undulator		 11.0.1 75-3000 eVa 5.0 cm 36.5 1.43-5.5 cm 0.85-0.10 Tb
0.57-0.10 Tc
EPU50 Elliptical Polarization Undulator 11.0.2 71-3000 eVa 5.0 cm 37 1.38-5.5 cm 0.86-0.10 Tb
0.58-0.10 Tc
W114 Wiggler 5.0.1
5.0.2
5.0.3		 6-21 keVd 11.4 cm 29 1.25-18.0 cm 1.94-0.03 T
QEPU90 4.0.3 8-1600 eVa 9.0 cm 20.5 1.45-9.9 cm 1.18-0.06 Tb
0.78-0.06 Tc

a Elliptical polarization mode.
b Vertical field.
c Horizontal field.
d Wiggler mode