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Journals and Conferences
Urinary stress incontinence was treated by the Marshall-Marchetti-Kranz (MMK) procedure in 42 and by Burch coloposuspension in 44 women. All were assessed preoperatively and for greater than 1 year postoperatively, both clinically and by urodynamic tests. Cure of incontinence was achieved to a similar extent by both procedures, in 71% after the MMK and 79%… (More)
The European project OPTHER - Optically Driven THz Amplifiers, is focused on the realization of a THz amplifier. This device aims to overcome the actual limitations of THz sources in terms of emitted power, opening the way to the use of THz in monitoring security systems. Two alternative schemes are under study for amplification. In the first one (THz drive… (More)
Submillimeter wave radiation, which is also referred to as terahertz radiation, has not been extensively explored until recently due to a lack of reliable components and devices in this frequency range. Current advances in technology have made it possible to explore this portion of the electromagnetic spectrum, and to create innovative imaging and sensing… (More)
The OPTHER (OPtically Driven TeraHertz AmplifiERs) project represents a considerable advancement in the field of high frequency amplification. The design and realization of a THz amplifier within this project is a consolidation of efforts at the international level from the main players of the European research, academy and industry in vacuum electronics.… (More)
For the design of a high efficiency MBK the calculation of the properties of resonant cavities is critical. A method of moments can be used to find these properties quickly and to a known accuracy.
This paper describes the status of the OPTHER (OPtically driven TeraHertz AmplifiERs) project and progress toward the THz amplifier realization. This project represents a considerable advancement in the field of high frequency amplification. The design and realization of a THz amplifier within this project is a consolidation of efforts at the international… (More)
Currently, klystrons employing monotonic bunching offer efficiencies on the order of 70%. Through the use of the core oscillation electron bunching mechanism, numerical simulations have predicted klystrons with efficiencies up to 90%. In this paper, we present PIC simulations of such geometries operating at a frequency of 800 MHz, with efficiencies up to… (More)
Thales Electron Devices has been developing and manufacturing 10MW L-band vertical Multi Beam Klystrons (TH1801) for TTF, FLASH and PITZ machines at DESY for more than 10 years. At this point, 8 tubes have been installed at DESY with more than 80 000 hours of cumulated RF operation. All over these years, THALES has been collecting data on MBK tubes behavior… (More)
The design of klystrons has long been a manual process guided by experience. However, with well-defined specifications and sufficiently rapid simulation methods, it is a good candidate process for automatic optimization techniques. In this paper, such a technique is evaluated and refined using klystron specific techniques, leading to several designs (with… (More)
A 263 GHz gyrotron dedicated to Dynamic Nuclear Polarization (DNP) enhanced Nuclear Magnetic Resonance (NMR) spectroscopy has been designed by EPFL and manufactured by Thales. With this device, we have demonstrated an output power up to 160 W in continuous wave. Design and main experimental results are discussed in this paper.