The Advanced Photon Source has developed the innovative horizontal gap vertical polarization undulator (HGVPU) for the Linac Coherent Light Source-II (LCLS-II) x-ray free-electron laser project at the SLAC National Accelerator Laboratory. The APS transferred the complete documentation on the HGVPU to Lawrence Berkeley National Laboratory (LBNL), where 34 of the devices will be fabricated for the LCLS-II.

The APS is now tasked with helping on inspection, testing, and tuning of 14 HGVPUs, and delivery of the successfully tested HGVPUs to SLAC.

In the photo, Lawrence Berkeley National Laboratory engineer Kyle McCombs shows members of the APS HGVPU team how to use the HGVPU pole-height tuning fixture developed by LBNL. From left: Isaac Vasserman of the Argonne Accelerator Systems Division Mechanical Devices Group (ASD-MD) in the APS, John TerHAAR (ASD-MD), Kyle McCombs (LBNL Engineering), and Joseph Xu (ASD-MD). HGVPU device number 18 fabricated by Keller Technology Corporation is in the background.