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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 six elliptically polarizing undulators, two in straight 4, two in straight 11, and one each in straights 6 and 7. 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 40 x 10-12 m·rad, horizontal emittance of 2.0 x 10-9 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

120–5000 eV

4000–11000 eVd

30 mm 50 5.5–27 mm 1.5–0.13 T
U50 Undulator 8.0.1 80–3000 eV 50 mm 89 14–45 mm 0.85–0.10 T
U80 Undulator 12.0.1 20–1900 eV 80 mm 55 24.7–83 mm 0.80–0.07 T
U100 Undulator 9.0.1 8–1500 eV 100 mm 43 22.7–116 mm 0.98–0.05 T
U100 Undulator 10.0.1 12–1500 eV 100 mm 43 23.1–116 mm 0.80–0.05 T
EPU35 Elliptical Polarization Undulator 6.0.2

265–4000 eVa

35 mm 52.5 12–40 mm 0.71–0.06 T
EPU50 Elliptical Polarization Undulator 4.0.2

73–3000 eVa

50 mm 37 14–55 mm

0.80–0.10 Tb

0.58–0.10 Tc

EPU50 Elliptical Polarization Undulator 11.0.1

75–3000 eVa

50 mm 36.5 14.3–55 mm

0.85–0.10 Tb

0.57–0.10 Tc

EPU50 Elliptical Polarization Undulator 11.0.2

71–3000 eVa

50 mm 37 13.8–55 mm

0.86–0.10 Tb

0.58–0.10 Tc

EPU70 Elliptical Polarization Undulator 7.0.2

16–2000 eVa

70 mm 26.5 12.5–75 mm 1.18–0.07 T
W114 Wiggler 5.0.1
5.0.2
5.0.3

6–21 keVd

114 mm 29 12.5–180 mm 1.94–0.03 T
QEPU90 4.0.3

8–1600 eVa

90 mm 20.5 14.5–99 mm

1.18–0.06 Tb

0.78–0.06 Tc

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