Wake Fields
The electrons from the klystron build up the driving field. The driven particles also generate a field, called the wakefield. For strong wakefields high frequencies are used, which also allow higher field strengths. A small dielectrically loaded waveguide or coupled cavity waveguides are used instead of large waveguides with small drift tubes.
At the end all fields are absorbed by a dummy load or cavity losses.
Read more about this topic: Linear Particle Accelerator
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