Superconducting Undulators

Superconducting insertion devices are very attractive for synchrotron light sources. For a given gap and period length, higher fields can be reached in respect to permanent magnet insertion devices thus permitting to reach higher photon fluxes.

BNG started the development of superconducting insertion devices in 2007 in collaboration with the insertion devices group at the ANKA light source in KIT Karlsruhe.

During the past 2 years we developed and tested several small scale magnet prototypes to familiarize with the technology. At the moment we are completing the fabrication of a 1.5 m long cryogen free unit for ANKA.

Overview - Superconducting Undulators

SCU15 NbTi Undulatur für KIT

SCU15 NbTi demonstrator

Nb3Sn Undulator mockup

 

 

SCU15 NbTi Undulatur für KIT

Customer: KIT,
Karlsruhe Institute of Technology

Start of project: 2007 (in progress)


SCU15 is a 15 mm period length, 100.5 full periods long NbTi undulator with the addition of one period at each side of the magnet, which is used to adjust the end field distribution.

The specifications of the magnet are shown in the table below. The mechanical tolerances of SCU15 are very strict and specified in a functional way. The electron beam must not experience a phase shift of more than 3.5 degrees as it propagates through the undulator. For the case that this goal cannot be reached by the control of mechanical tolerances only, a magnetic shimming system is forseen.

The shimming concept is very specific and has been tested on a short mockup with the same geometrical characteristics as the SCU15 shows. SCU15 is a dry magnet cooled by means of 4 cryocoolers and is designed for a beam heat load of 4W.

 

Technical Data:

Units Value
Period length mm 15
Number of full periods 100.5
Max field on axis with 5 mm gap T 1.5
Max field in the coils T 2.4
Minimum gap mm 5
Operating gap mm 8
Gap at beam injection mm 25
K value at 5 mm gap >2
Design beam heat load W 4

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