Status of VPU development for PAL-XFEL
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PAL-XFEL is planning to install second hard X-ray undulator line (HX2) to meet the high beamtime demand from the users. The photon energy range for the second hard X-ray beam line is from 2 to 11 keV which is lower than the first hard X-ray photon energy range (2~ 20 keV). The required undulator parameters are 35 mm period, max K eff =3.48 at 9.00 mm gap, ~3.0 m magnetic length with phase error less than 5 degrees. In addition to the existing conventional undulator design, horizontal gap vertical polarized undulator (HGVPU) concept is also being considered. HGVPU is well developed by the LCLS-II team and applied in the LCLS-II. In this report, we summarize the VPU design for PAL-XFEL HX2, and analyze the results of the prototyping.
