Tuneable FEM system as a plasma source for biological applications
There is increasing interest in the use of microwave power for industrial applications. A pulsed tuneable microwave source is beneficial as it allows the high electromagnetic field of a high power to be applied to a target without excessive heating. The free electron maser (FEM) is the tuneable source with ability to operate across a wide range of frequencies from 8 to 20 GHz. Using higher frequencies than the common 2.45 magnetron, increases the fields obtained and also beneficial scaling effects on some applications, such as microwave induced plasmas. The paper presents the basic principles of the FEM system as well as the applications of UV.
Plasma sources using long linear microwave field applicators: main features, classification and modelling
Microwave plasma sources using elongated field applicators that extend over distances large in comparison with the free-space wavelength are in demand for many applications, mainly for the processing of large surfaces of materials that can be moved transversely with respect to the applicator. Various long applicators have been presented in the literature but no unified description is available to assist the potential user in selecting the one best suited for his or her particular needs. This paper is intended to meet this need. All applicators of this kind provide an electromagnetic wave from which originates the electric field sustaining the discharge. However, they differ in some essential aspects which reflect on their performance and on the modelling of the resulting plasma. We propose to classify these applicators first into two main categories according to the way the power flows to the plasma: (i) transmission-line applicators; and (ii) antenna applicators. Then, in each category, we need to distinguish two possible wave characters: travelling and standing. This leaves us with four systems to examine. For each of these systems, we briefly approach discharge modelling, mainly to examine the longitudinal distribution of plasma properties and establish guidelines for the methodical design and operation of these plasma sources. Finally, we evaluate the advantages and disadvantages of the four systems.
A Review on Simulated Micro-Gravity Experiment Systems of Space Robot
The characteristics of the simulated micro-gravity experiment system (SMGES) are introduced and the key problems are summarized.Six main realization methods for SMGES are introduced,including the experiment systems based on free falling objects,parabolic flight,air-bearing table,neutral buoyancy,suspension system and hardware-in-loop (HIL) simulator.The application scopes,advantages and disadvantages of each method are discussed and compared.Then we propose two realization concepts based on dynamic emulation and kinematic equivalence,and set up an experiment system to test and evaluate the key algorithms for path planning and control of space robot.