Improving the brilliance of accelerator light source by developing a strong magnetic field superconducting undulator with extremely short period length

• Main Authors: Chen, Sei-Da, 陳思達
• Other Authors: Hwang, Ching-Shiang
• Format: Others
• Language: en_US
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/47721752394303383311

博士 === 國立交通大學 === 電子物理系所 === 103 === Insertion devices play important rule in synchrotron accelerator facility. By designing different kind of insertion devices (ID), the spectrum of the synchrotron radiation from the insertion deices can provide a variety of high brilliance and variable polarized photon spectrum. Therefore, the insertion devices can promote the synchrotron accelerator facility to provide a great diversity of synchrotron light for many kinds of application experiments. An important future development is to improve the brilliance and efficiency by developing undulator with new materials to increasing the magnetic flux density in an extremely short period, and this is the main purpose of this study. New technologies about superconducting materials, like the NbTi-wire, YBCO-wire and YBCO-bulk, having potential to produce higher magnetic field of an undulator, were considered. Hereinafter, the medium energy accelerator facility can have the enhanced brilliance and the improved energy of hard x-ray. In other words, the beam energy can be lower down, and the construction price of the accelerator facility hence decreases. On another aspect, developing various polarized high field undulator is also one main purpose of this study. It was considered to improve the efficiency by employing the property of circular polarized light. In this study, the improvement of theory of synchrotron radiation, superconducting magnet design, manufacture, measurement and analyzing were all mentioned. For the development of undulator: first, the development of superconducting elliptical polarized undulator was discussed; then, the YBCO-bulk material was introduced to make a stagger undulator, which is in a preliminary stage; a high field magnetizing system was constructed for the research of YBCO-bulk undulator. Meanwhile, some new points of view about spectrum were proposed based on the study work of the theory of synchrotron radiation. Besides, one issue about Terawatt (TW) X-ray free electron laser was also discussed by analyzing transverse photon beam distribution.