The characteristics of a stable discharge at atmospheric pressure is investigated.The plasma source consisted of two closely spaced parallel-plated perforated electrodes, driven by a radio frequency power to generate a uniform cold plasma in Helium at atmospheric pressure. Both alpha and gamma modes were clearly observed. The hollow cathode effects were found in the discharge. The influence of the dielectric barrier on the discharge was also investigated by utilizing a surface-anodized aluminium electrode as the anode.

Surface modification of polypropylene membrane by argon (Ar) plasma-induced graft polymerization with hydrophilic monomer [acrylic acid (AA) in this work] was investigated. It was found that both the distance of the membrane from the Ar plasma center and the plasma power had a strong influence on the surface modification, hydrophilicity and graft yield (GY) of the treated membrane. Results suggest that remote plasma treatment with a proper sample position, plasma power and graft polymerization leads to a membrane surface with not only less damage, but also more permanent hydrophilicity, than direct plasma treatment does. By analyzing the morphology and the chemical composition of the membrane surface by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS), as well as Fourier transform infrared attenuated total reflection spectroscopy (FTIR-ATR) respectively, a possible mechanism was tentatively revealed.

4 n e w technique for wall conditioning with a permanent magnetic field has been tested and developed on t h e HT-7 superconducting tokamak by ion cyclotron range frequency wave injection. T h e operation ranges for conditioning and recycling was investigated with different working gas ( 0 2 , He), toroidal field (0.1-2.5 T) and r f powers. T h e experimental results show that its cleaning efficiency is about three times higher than that o f glow discharge cleaning. This n e w technique has been used daily during experiments.

A new solid waste disposal technology setup with DC arc plasma is presented. Being different from conventional combustion or burning such as incineration, it is based on a process called controlled high-temperature pyrolysis, the thermal destruction and recovery process. The results of vitrification of the circuit board is presented. The properties of vitrified product including hardness and leaching test results are presented. The final product (vitrified material) and air emission from the plasma treatment is environmentally acceptable.

A novel atmospheric plasma device developed in this paper. which is more effective and convenient to study the plasma-initiated polymerization (PIP) than conventional setup. The structure and mechanism of the device is introduced. Some plasma-initiated polymerization experiments are carried out on the device. and the conversion of -AA (Acrylic acid) and -111 (Acryl amide) atmospheric (N2) plasma polymerization are respectively 89% and 94% after 120 11 post polymerization, whereby IR spectra of the product (AX. .All). Our PIP result are confirmed.