SOLEIL Electromagnetic Undulator

Insertion devices

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SOLEIL Electromagnetic Undulator

Description

Danfysik has made a 10,4m long Electromagnetic Elliptical Undulator HU640 for the SOLEIL Synchrotron, France

Data

Configuration:
Elliptical Electromagnetic Undulator
Period length:
640 mm
Vertical flux density:
0.11T
Horizontal flux density:
0.09T
Magnetic length of the device:
10,400 mm

10,4m long Electromagnetic Elliptical Undulator HU640 for the SOLEIL Synchrotron, France

Project start 2004. Project completion 2005.

Danfysik A/S has built a 10.4 m elliptical electromagnetic undulator with a 640 mm period lenght. The undulator is made with a fixed-gap for use in the VUV-range, delivering light between 5eV and 40eV. The horizontal and vertical field components are produced by three sets of coils in a special arrangement, allowing production of all kinds of light polarization on a fixed gap girder structure. The horizontal magnetic field is produced by one set of special double coils while the vertical field is produced by the combination of two sets of coils. These two sets of vertical field coils are shifted with respect to each other by a quarter of a period along the longitudinal direction. As the magnetic field of this undulator is created without use of iron, the field quality is dominated by the accuracy of the coil winding. All coils of a type therefore have to be identical within narrow tolerances, and also their accurate position in the undulator is essential for the performance of the device. The field strength of each coil was measured at Danfysik for the sorting of coils on the device.

Specification for the Electromagnetic Elliptical Undulator

                                                                      Specifications                     As-built
Undulator type                                            EM                                          EM
Gap range                                                   Fixed                                      Fixed
Period length                                              640 mm                                640 mm
Magnet flux density
Peak vertical flux density                           0.11 T                                    ³ 0.11 T
Peak horizontal flux density                      0.09 T                                    ³ 0.09 T
Phase error                                                 £ 4                                           £ 2.7

Field integrals on-axis (x=0):
Normal and skew first integrals £ 20×10-6 Tm £ 40×10-6 Tm
Normal and skew second integrals £ 2.8×10-4 Tm2 £ 4.6×10-4 Tm2

Link
Soleil Synchrotron