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TUPSA070 |
The Development of Field Emission Cathodes for Particle Accelerators by Pressing Pyrolytic Graphite With a Triple Carbonate | |
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Today the materials for cathodes with high current density and long work time usable in particle accelerators' electron guns are in demand. A perspective method for creating such cathodes is implanting alkaline and alkaline earth metals into carbon structures in order to lower the work function*. In our research, the goal was to refine the technology for creating a composite, in which graphite and emission active elements form an intercalated compound**, where molecular layers of graphite alternate with molecular layers of barium, strontium and calcium, and these materials' oxides are concentrated inside interlayer caverns. To achieve this, a mixture of fine grained pyrolytic graphite and triple carbonate of alkaline earth metals (Ba, Sr, Ca) CO3 is pressed together without binder compound at different pressure. The specimens 2x1x1 mm are obtained in result. A composite material is obtained as a result of this research, and the work range of processing pressures allowing to create cathodes from such a material, is determined.
* Sheshin E.P., The surface structure and field emission properties of carbon materials, Dolgoprudnyj, MIPT, 2011, P. 126. ** Dresselhaus M.S., Dresselhaus G. (2002). Intercalation compounds of graphite. Advances in Physics 51: 1. |
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WEPSB076 |
The Development and Application of Injectors Free Electrons | |
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Electronic injectors (or electron accelerators with the output of the electron beam into the atmosphere or other media) have been known, since the 20-ies of XX century. However, only the recent achievements of electronic and vacuum technology have allowed progress in the creation of industrial designs of injectors. To date, this large stationary devices that use is usually powerful thermionic cathodes. Currently, such injectors are used in many industries and medicine. Such as: 1) processing and curing of polymer materials and coatings; 2) disinfection and sterilization of medical devices; 3) neutralization of waste, both industrial and human activity; 4) Processing of food products from cereal to meat, increases the shelf life of their times; 5) many other applications. Electron beams are especially needed for applications such as they maximally and optimally structure without changing the material and affect the crystalline structure of the gene processed materials. There is growing demand for mobile and relatively low-voltage injector (U = 200-1000kV) and power up to 1kW. In our department we created a prototype of such a device with a very worthy performance*, which will be the prototype for the development of a new class of relatively small-sized electron injectors.
* N.N. Chadaev, E.P. Sheshin Compact electron injector with cathodes made from carbon materials." Proceedings of the 56th Conf. MIPT, "Physical and Quantum Electronics", Dolgoprudny, 2013 pp. 63-64. |
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