2. Schmidt T, Imhof A, Ingold G, et al. A fixed gap APPLE II undulator for SLS[C]//SYNCHROTRON RADIATION INSTRUMENTATION: Ninth International Conference on Synchrotron Radiation Instrumentation. AIP Publishing, 2007, 879(1): 400-403.
[3]
3. Tanaka T, Kitamura H. Figure-8 undulator as an insertion device with linear polarization and low on-axis power density[J]. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1995, 364(2): 368-373.
[4]
4. Qiao S, Ma D, Feng D, et al. Knot undulator to generate linearly polarized photons with low on-axis power density[J]. Review of Scientific Instruments, 2009, 80(8): 0851081-0851084.
[5]
5. Chubar O, Elleaume P, Chavanne J. A three-dimensional magnetostatics computer code for insertion devices[J]. Journal of synchrotron radiation, 1998, 5(3): 481-484.