To reduce the impact of Joule heating on the spatial resolution of long magnetic lens framing cameras,this paper developed a pulse current generator based on thyristors and Marx circuits for use in solenoid long magnetic lenses,and studied the relationship between output pulse current and circuit parameters.Based on the current triggering characteristics of thyristors and the inductance characteristics of long magnetic lenses,self triggering circuits and diode freewheeling circuits were designed to reduce the cost of driving circuits and protection circuits.When the charging voltage is 200 V,the solenoid load resistance is 0.94 Ω,and the inductance is 5.25 mH,the Marx generator with four parallel circuits and four stages in series on each circuit outputs a peak pulse current of-337.5 A and a full width at half maximum of 8.89 ms.When used to excite a long magnetic lens,it can generate a pulse magnetic field with a peak value of 0.57 T and a full width at half maximum of 3.31 ms.
Marx generatorpulse currentsolenoid long magnetic lenspulsed magnetic fieldframing camera
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