THE ROTATING WING DRUM - AN APPARATUS FOR ION-BEAM TREATMENT OF POWDERS

In order to study ion implantation effects in irradiated powders a rot ating wing-drum apparatus has been constructed. It consists of a conic al vessel with wings inside which hosts the powder. The vessel is rota ted. The wings lift the powder grains which then drop down through the ion beam line and are hit by the ions. This process is repeated until statistically a homogeneous ion beam treatment is achieved. Setup and features of this technique for agitating powder in an ion beam are de scribed in detail, including different wing drums and an implantation chamber in which the wing drum is mounted. Problems with powder loss a nd sputtering of the drum rearside are discussed. As an example, resul ts of gold ion implantation and deposition on alumina powder are prese nted.