Abstract
In this work, we present a low-power RF characterization of a novel TM <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">01</inf> X-band mode launcher for the new generation of high-brightness RF photo-injectors. The proposed structure employs a fourfold symmetry in order to minimize both the dipole and the quadrupole fields that could cause an emittance growth in the early stages of the acceleration process. A "cold" model aluminum structure, comprising two mode launchers connected by a central 62 mm-long circular waveguide, was fabricated by milling aluminum blocks, assembled and measured in back-to-back configuration. The low-power RF test, performed at the Istituto Nazionale di Fisica Nucleare Laboratori Nazionali del Sud (INFN-LNS), validated both the numerical simulations and the quality of the fabrication. An oxygen-free high-conductivity copper version of the device is being manufactured for high-power and ultra-high-vacuum tests that are planned to be conducted at the Stanford Linear Accelerator Center (SLAC).
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