Abstract
Pohang Accelerator Laboratory (PAL) is developing an Elliptically Polarized Undulator (EPU) to produce polarized synchrotron radiation at Pohang Light Source (PLS). The EPU6 is an Apple-II type elliptical undulator, which changes the polarization of the field by translating the quadrant arrays. The PLS EPU6 features a period of 6 cm, a minimum gap of 19 mm, 25 full field periods, a maximum vertical flux density of 0.69 T, a maximum horizontal flux density of 0.46 T, and 1575 mm total magnetic structure length. The EPU6 is optimized for highly polarized synchrotron radiation from 117 to 1500 eV at 2.5 GeV electron energy. Using correction coils to compensate the orbit drift in the undulator increased the estimated photon flux by 15% compared to the case without the compensation.
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