Characterization of soft X-ray undulator for the Siam Photon Source

An undulator for production of intense soft X-rays has been constructed for the Siam Photon Source (SPS). The device, named U60, is being characterized and prepared for installation. It is a pure permanent magnet planar undulator, consisting of 41 magnetic periods, with 60 mm period length. Utilization of the undulator radiation in the photon energy range of 30–900 eV is planned. Magnetic field mapping of the undulator has been carried out using a Hall probe. The measured magnetic fields are used to estimate field errors and perturbations of the undulator on the electron beam dynamics in the storage ring. Compensation schemes for the perturbation are investigated.