Beam Source Development


High Duty Cycle, High Gradient Photoinjector Guns Manufactured with Solid Freeform Fabrication

The development of inexpensive, very high-duty cycle, high gradient photoinjectors is critical for the next generation of accelerator systems, such as X-ray free-electron lasers (FELs), inverse Compton scattering (ICS) sources, energy recovery linear accelerators (ERLs), injectors for linear colliders, and a variety of industrial systems for homeland security applications.  A key issue for high average power, normal conducting, photoinjectors is efficient structure cooling. The fabrication of current state-of-the-art high average power photoinjectors relies on conventional design and fabrication techniques requiring a multitude of braze joints and limited cooling channel geometries.


RadiaBeam is investigating a novel fabrication technique which will allow complex, conformal cooling channels to be integrated into photoinjector guns and other RF structures.  Optimization of solid freeform fabrication (SFF) for copper RF components will be followed by the construction and testing of a prototype photoinjector with enhanced thermal handling features possible only through the use of SFF.  Two different types of photoinjector guns with different specifications and applications are currently being produced by RadiaBeam using this technique.