Principles and preliminary design for a microwave active pulse compressor using an electrically-controlled ferroelectric switch are presented. The design of an 11.4 GHz, 500 MW pulse compressor with a pulse width of about 40 nsec and a compression ratio of 10 is described. It is planned to test this compressor using the Omega-P/NRL X-band magnicon.

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We present a superconducting traveling wave accelerating structure (STWA) concept, which may prove of crucial importance to the International Linear Collider. Compared to the existing TESLA cavity design, the traveling wave structure can provide ~20-40% higher accelerating gradient for the same aperture and the same peak surface RF magnetic field. The recently achieved SC structure gradient of 35 MV/m can be increased up to ~50 MV/m with the new STWA structure design. The STWA structure is supposed to be installed into the superconducting resonance ring and is fed by one or two couplers (depending on the required input power) with appropriate phase advance to excite a traveling wave inside the structure. We discuss the structure design, optimization of the parameters, tuning requirements and plans for further development.