Plasma diagnostics were carried out in a theta-pinch device to investigate the applicability for plasma– material interaction under fusion-like conditions. A series of triple probe diagnostics show that the plasma is sustained for approximately 80 ls at each pulse, with 3.0 (10) m 3 plasma density and up to 40 eV electron temperature when a 32 lF main capacitor is discharged at 20 kV. In order ...

A three-dimensional full-wave code is newly employed to investigate the plasma production by Ion-Cyclotron Range of Frequency (ICRF) waves on GAMMA 10. The spatial structure of the excited wave fields are calculated for two types of ICRF antennas (Double Half-Turn and Nagoya Type-III) in the central cell. The plasma production by ICRF waves depends on the wave excitation in the plasma. Eigenmod...

Radio-frequency ~rf! inductively coupled planar plasma ~ICP! provides a better way to generate spatially confined high density gas discharge plasmas for microelectronics processing. Commercial processing equipment using this technique is currently available, but is limited in size to 20 cm in diameter by problems with plasma uniformity and antenna dielectric window erosion. We have developed a ...

By means of the study on electromagnetic (EM) waves propagating along the plasma column, it is found that the radiation of a plasma column is caused by two kinds of operation modes. The first one is a guided mode which leads to a surface current radiation, and its operation condition is obtained by boundary conditions and physical properties of plasma. The second one is a leaky mode which resul...

Inter-digital line antennas are being used to test the feasibility of lower hybrid current drive in MST. The antennas use !/4 resonators and launch slow waves at 800 MHz with n|| ~ 7.5. Routine operation has been achieved with a good impedance match between antenna and plasma. High power antenna design improvements include larger vacuum feedthroughs, better impedance matching, and rf instrument...

We present SCENIC simulations of aW7X 4He plasma with 1% Hminority and with an antenna model close to the design foreseen for the W7X ICRF antenna [1, 2]. A high mirror and a standard equilibrium are considered. The injected wave frequency is fixed at 33.8 MHz and 39.6MHz respectively and only fundamental minority heating is considered. Included in this calculation is a new realistic model of t...

The radiation characteristic of plasma antenna is investigated by using the finite-difference time-domain (FDTD) approach in this paper. Through using FDTD method, we study the propagation of electromagnetic wave in free space in stretched coordinate. And the iterative equations of Maxwell equation are derived. In order to validate the correctness of this method, we simulate the process of elec...

Antenna Miniaturization Using Fractals Richa Garg, AP ECE Deptt., [email protected], J.C.D.C.O.E., Sirsa ABSTRACTThe use of fractal geometry in designing antenna has been a resent topic of interest. Fractal shape has their own unique characteristics that the improved antenna performance can be achieved without degrading the antenna properties. Modern telecommunication system requires antenn...

in this paper a new uwb textile slot antenna has been designed with high precision. this work aimed to makecloser steps towards real wearability by investigating the possibilities of designing wearable uwb antenna wheretextile materials are used for the substrate as well as the conducting parts of the designed antenna. the antenna iscomposed of three textile layers: the top and bottom are condu...

The operational lifetime of a radio-frequency ~rf! ion source is generally governed by the length of time the insulating structure protecting the antenna survives during exposure to the plasma. Coating the antenna with a thin layer of insulating material is a common means of extending the life of such antennas. When low-power/low-duty factor rf excitation is employed, antenna lifetimes of sever...