Further high power tests of the additive manufacturing IH-type cavity

Additive manufacturing (AM) has become a powerful tool for rapid prototyping and manufacturing of complex geometries. A 433 MHz IH-DTL cavity has been constructed as a proof of concept for direct additive manufacturing of linac components. In this design, the internal drift tube structure has been produced from pure copper using AM. We present the most recent results from high-power tests with the AM IH-type structure, including additional tests with improved surfaces to reduce field emission during operation.