DEVELOPMENT OF IVUN AT POHANG ACCELERATOR LABORATORY

摘要

Pohang Accelerator Laboratory (PAL) is developing In Vacuum Undulator (IVU). With operating experience of in vacuum revolver undulator from SPring8 and conventional IVU from ADC, the first IVU with 22.3 mm magnetic period will be developed which has 1.8 m magnetic length and 2.2 m flange to flange length which will be installed in the PLS storage ring. The IVU will be equipped with online built-in magnetic measurement for the end regions to assess the accuracy of the assembly, any degradation coming from the radiation damage or high temperature. In this report, the design issues related to the vacuum system, measurement system, and other engineering problems of the IVU will be discussed.