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Recent experiments in ASDEX Upgrade aimed at improving the physics base for ITER and DEMO to aid the design and prepare operation. In order to increase its exhaust capabilities and operational flexibility a new bulk W divertor as well as an adjustable cryo-pump had been installed prior to the 2014 campaign. In experiments with high field side pellet injection central electron densities twice as high...
The MAST programme and upgrades are aimed at using MAST's capabilities and parameter ranges to address specific issues for ITER physics, help find solutions for DEMO (in particular plasma exhaust) and develop a credible physics basis for possible ST-based Component Test Facilities/Fusion Nuclear Science Facilities (CTF/FNSF). MAST is also aimed to provide an attractive access point for scientists...
A compact shallow etched distributed diffraction grating waveguide demultiplexer has been demonstrated in silicon-on-insulator for coarse wavelength demultiplexing applications. The device supports 4 channels with 20nm channel spacing.
A shallow-etched, distributed grating is proposed as a wavelength demultiplexer. Modeling results predict up to 79% efficiency over a 60 nm wavelength range. Device fabrication and measurements are presented
This paper provides an overview and update of a specialized frequency reference system for the NASA Deep Space Network (DSN) to support Ka-band radio science experiments with the Cassini spacecraft, currently orbiting Saturn. Three major components, a hydrogen maser, stabilized fiber-optic distribution assembly (SFODA), and 10 Kelvin cryocooled sapphire oscillator (10K CSO) and frequency-lock-loop,...
A new timing system has been developed for the NASA deep space network (DSN) and is currently in the final stages of integration, testing and implementation in all three DSN sites. The DSN is a distributed antenna network for deep space communication, whose facilities are continuously engaged in spacecraft tracking, very long baseline interferometry (VLBI) or radio astronomy activities. Its primary...
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