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MOPP104 |
Analytical Approach for Life Assessment of Pierce Type Diode Electron Gun in High Energy Electron Linear Accelerator Systems | |
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High Energy Electron linacs are used for generation of high energy X Rays towards the protection and development of humanity. Efficiency and life of Linac and, other high power microwave tube like klystrons and magnetrons solely depends upon ruggedness and reliability of the gun. The biggest threat to the vitality of electron gun is the poisoning of the metallic surfaces, other factors like evaporation of key constituents of cathode, geometrical change in cathode structure, quality of HV and LV signals also decisive to determine the life. This paper reveals the performance behavior of electron gun in a life span of 0-10 years is evaluated by the analytical interpretation of huge data collected over the period, for various Magnetron and Klystron based Linacs, of 7,9 and 15 MeV energies. Following parameters are recorded and analyzed almost on daily basis for the period: Reflected Wave, Beam Current, Vacuum current etc. The correlation of the data and the wave shapes has revealed the pattern of gradual decrement in the rate of generation of electrons from the gun in normal case. Abrupt loss of electrons has also detected in case of partial loss of vacuum level in the gun.
Keywords: Thyratron; Perce Type Diode Gun,; Linac; Resonant Cavities; Reflected Wave; Ultra High vacuum. |
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