抗强干扰快速测量真空规管及仪器的研究

托卡马克装置中存在强磁场、强电场,放电过程中真空度变化迅速。为满足这种特殊环境的真空测量要求,开展了抗强干扰快速测量真空规及仪器的研究。快规使用平板电极结构,在普通热阴极电离规管的基础上增加了调制极;仪器电路除完成稳发射、为加速极供电、离子流放大等基本功能外,它可以提供更大的灯丝电流,为调制极提供周期性脉冲电压,离子流和电子流放大器、调制/解调电路和锁相环电路相互配合,确保快速准确测量。仪器的主控制单元以微处理器为核心,可以设定系统运行的相关参数,离子流、发射电流、灯丝电流可供主控单元采集,以配合完成自动调整和相应控制。

Research on a fast ionization gauge and its instrument with strong anti-interference

Strong magnetic and electric fields are existed in tokamak device and its vessel pressure changes rapidly during discharging.To meet the vacuum measurement requirement of the special environment,research on a fast ionization gauge and its instrument with strong anti-interference was carried out.The fast gauge adopted a plate electrode structure and a control grid was added based on ordinary hot cathode ionization gauge.Besides basic functions,such as providing stable electron emission,acceleration grid voltage,ion flow amplification etc.,this instrument can provide a larger filament current and cycle pulsed voltage for control grid.By means of ion flow and electron flow amplifier,modulator/demodulator and phase-locked loop circuits,the measurement is quick and accurate.The main control unit of this system is microprocessor that outputs instructions,sets some operation parameters and performs automatic adjustment and control.