DEVELOPMENT OF A FOURIER-TRANSFORM IOC CYCLOTRON RECONANCE MASS SPECETROMOTER FOR ISOTOPIC ANALYSIS

本项目的目的是建造一台离子回旋共振质谱仪，用来评定等谱测量的精度。该仪器具有以下特点：(1)采用永磁体获得强度为0.3特斯拉的均匀磁场。(2)真空系统由高真空扩散泵组成。最终真空度为10℃~(-7)帕斯卡。(3)使用商用波列发生器和DERECT数字合成器PEINCIPLE进行离子激发。(4)采用可变漏气阀对进气处理系统进行扩展。直接的目标离子将是残留气体物种。(5)商用AVILABLE附加电路板用于实现信号的模数转换和系统控制脉冲的产生。(6)商用AVAILABLE用于微型计算机的软件促进了实验控制程序和测量程序的开发。软件最初是为使用微型计算机作为FFT分析器而开发的。

THE PURPOSE OF THE PROJECT IS TO CONSTRUCT THE ION CYCLOTRON RESONANCE MASS SPECTROMETER BY WHICH THE PRECISION IN ISOTOPRERATION MEASUREMENT CANBE EVALUATED WECOMPLETED THE MACHINE FEATURED AS FOLLOWS.(1) A PERMANENT MAGNET IS IS ADOPTED TO OBTAIN THE HOMOGENEOUS MAGNETIC FEILD WITH THE STRENGTH OF 0.3 TESLA. THE POLE GAP WAS 40 MM.(2) THE VACUUM SYSTEM WAS COMPOSED OF THE HIGH VCAPACITY OIL DIFFUSION PUMP. THE ULTIMATE VACUUM WAS 10^<-7>PASCAL.(3) A COMMERCIAL WAVE GENERA TOR WITH THE DERECT DIGITAL SYNTHESIZER PEINCIPLE WAS USED FOR EXCITATION OF IONS.(4) A VARIABLE GAS LEAK VALVE WAS ADOPTED FOR FUTURE EXPANSION OF INLET GAS HANDLING SYSTEM. THE IMMEDIATE TARGET IONS WOUD BE THE RESIDUAL GAS SPECIES.^<12>CO AND^<13>CO.(5) COMMERCIALLY AVALILABLE ADD-ON CIRCUIT BOARDS FOR MICROCOMPUTER WERE UTILISED FOR REALISATION OF THE FUNCTION OF ANALOG-TO-DEGITAL CONVERSION OF THE SIGNAL AND CONTROL PULSE GENERATION OF THE SYSTEM.(6) A SOFTWAREPACKAGE COMMERCIALLY AVAILABEL FOR MICROCOMPUTER FACILITATED THE DEVELOPMENT OF THE CONTROL AND MEASUREMENT PROGRAM FOR THE EXPERIMENT THE SOFTWARE WAS ORIGINALLY DEVELOPED FOR USING THE MICROCOMPUTER AS THE FFT ANALYSER.