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Description
The FERMI seeded free-electron laser (FEL), located at the Elettra laboratory in Trieste, is a 4th-generation light source operating in the vacuum ultraviolet to soft X-rays range. In order to extend the FEL spectral range to shorter wavelengths, an increase in the linear accelerator (linac) energy from 1.5 to 2.0 GeV is required. S-band HG module is designed to fulfil the upgrade requirement of 30 MV/m accelerating gradient with the breakdown rate (BDR) in the range of low 10-8 bpp/m. One HG module consists of two HG structures, 3.0 m in length, and one Spherical Pulse Compressor (SPC). The 1st HG module is successfully commissioned at the FERMI linac up to an accelerating gradient of 27 MV/m with the BDR of around 5 x 10-8 bpp/m. In this paper, we share the commissiong experience of the HG module from installation, conditioning, high power operation, and commissioning with the beam.
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