Generation of ionizing radiation from lithium niobate crystals

7th International Conference Radiation-thermal Effects and Processes in Inorganic Materials

材料科学;物理学

Orlikov, L.N.^1 ; Orlikov, N.L.^1 ; Arestov, S.I.^1 ; Mambetova, K.M.^1 ; Shandarov, S.M.^1

Electronic Devices Department, Tomsk State University of Control Systems and Radioelectronics, Russia^1

关键词: Crystal surfaces;    Electric strength;    Electron currents;    Heating and cooling;    Lithium niobate crystal;    Local strengths;    Plasma formations;    Target materials;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/168/1/012074/pdf
DOI  :  10.1088/1757-899X/168/1/012074

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The work done experimentally explores generation of electron and x-ray radiation in the process of heating and cooling monolithic and iron-doped crystals of lithium niobate. Iron doping to the concentrations in the range of 1023m3was carried out by adding ferric oxide into the melt during the process of crystal growth. The research into radiation generation was performed at 1-10 Pa. The speed of heating from -10 to 1070C was 10-20 degrees a minute. Current pulses appeared at 17, 38, 56, 94, 98, 100, 105, 106, 1070C with the interval of 1-3 minutes. The obtained electron current increased in direct proportion to the crystal surface area. The maximum current was 3mA at the design voltage 11 kV on the crystal with 14,5x10,5x10 mm3surface area. The article describes the possibility to control the start of generation by introducing priming pulse. The results achieved are explained by the domain repolarization while heating the crystal and the appearance of electric field local strength. Bias and overcharge currents contribute to the appearance of electric strength, which stimulates breakdown and plasma formation. X-ray radiation appears both at the stage of discharge formation and during electron deceleration on gas and target material.