Comparison of electroplated and hand painted cathodes on self magnetic pinch radiographic diode operation

The repeatability of the radiographic performance of the Self Magnetic Pinch (SMP) diode is crucial to its use in Hydrodynamic experiments [1]. Years of experience of operation at AWE have shown that its repeatability is dependant upon the build quality of the diode, this includes component initial design, manufacture, storage, preparation and installation. A program of work is being undertaken to enhance repeatability of the diode preparation process. As part of this program an electroplating method to prepare the cathode is being investigated. Reported here is work carried out to investigate the surface finish that can be achieved from both traditionally hand painted and electroplated cathodes as well as the results of an experimental series carried out to compare the performance of cathodes prepared using the two techniques.