Experimental Study On Ion Trap Miniaturized Circuit Of ¹⁹⁹Hg⁺ Microwave Frequency Standard

Ion trap microwave atomic frequency standard is a highly combined product of physics and electronics.By using of the electric and magnetic fields applied on the storage device,which called ion trap,ions are confined in a very narrow space.So in addition to the weak effect of the confined field,the trapped ions rarely affected by other external interference.Mercury ion microwave frequency standard is a micro-wave frequency standard developed based on ion trap technology which uses 199Hg+as a working substance.It has many advantages,such as,the 19Hg+ ions confined in Lamb-Dicke region having no First-order Doppler frequency shift;the large mass of 199Hg+ ions reducing the Second-order frequency shift;the large clock transition energy level(～40.5GHz)and narrow line width causing high Q value of the clock transition line(～1012);the insensitive clock transition energy level to the environ-mental variables of temperature and magnetic field and so on.In addition,the mi-crowave frequency standard of mercury ion uses 202Hg+ isotope spectrum lamp as the pumping light source,which has the advantages of simple structure,good relia-bility and being miniaturized.The study of mercury microwave frequency standard in our laboratory has en-tered the stage of miniaturization and engineering.In this paper,the miniaturized circuits for trapping ions in high performance mercury ion microwave frequency standards are developed.The main work is as follows:1.Design of a low power consumption high voltage RF signal generator,the working frequency of the circuit is about 1MHz and the peak to peak value of the output ranges from 100V to 1710V.As the trapping field applied to mercury ion mi-crowave frequency standards,it can achieve the stably trapped mercury ions.At the same time,the circuit has the advantages of high efficiency,small vo-lume(76mm*68mm*58mm)and small power consumption(3.36W),and can meet the engineering requirement of miniaturization of mercury ion microwave frequency standards.2.Design a low power atomic furnace which can control its temperature pre-cisely,and we also measure the stability of the circuit and the control precision of the temperature,the Hg pressure in ion trap,we find out the atomic furnace temperature control precision is 0.20C,the overall circuit power consumption is about 4W.3.The circuit of the electron gun is improved,and the output voltage of the MOC8204M Optocoupler is controlled by the TTL level and the power consumption is about 4W.4.The miniaturized RF field circuit,temperature control circuit and electron gun furnace atomic circuit are all applied to find the fluorescence signal in Mercury ion microwave frequency standard,and we have found the clock transition fluorescence signal.Through signal analysis we find the RF circuit can trap 199Hg+ ion effectively.