Speaker
Description
For the first time, high shunt impedance at 162 MΩ/m and high group velocity at 3.1% of the speed of light are achieved simultaneously, in a normal-conducting radiofrequency (NCRF) accelerating structure at 5.7 GHz (C-band). We report our theoretical study on a novel type of traveling wave accelerating structure that operates with a 2π/3-mode. The high shunt impedance is realized by the low-loss, highly reflective ceramic insert confining the accelerating mode at the center. The high group velocity, or fast filling time of the radiofrequency (RF) wave, is made possible by the side coupling slots designed with large dimensions. As a result, this novel traveling-wave accelerating structure enhances the power efficiency significantly: first, the high shunt impedance allows providing a greater accelerating gradient with a fixed amount of RF power; second, the fast filling time allows an earlier start of the beam acceleration within each RF pulse, resulting in higher duty of beam production. We also discuss a permanent magnet assembly focusing the electron beam in the accelerating structure. The unique radiofrequency coupler design is also addressed. This work was also published as U.S. Patent App. 18/779,986.
| Working group | WG4 |
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