In order to address the issue of significant overlap between the pulse signal height and the background noise of the detector in the detection of low-energy heavy particles using existing gas ionization chambers in miniaturized AMS systems,a new Bragg-like gas ionization chamber was developed.Under a certain reduced field strength,this ionization chamber enables electron multiplication in the vicinity of the anode,resulting in an increase in pulse signal height and effective separation from the detector background noise.Experimental measurements were conducted using 5.8 MeV alpha particles,with adjustments made to the energy of alpha particles entering the detector and systematic calibration of detector performance under different gas pressures and anode voltages(reduced field strength E/P).Through simulation calculations and system calibration,the following conclusions were drawn:the detector is suitable for energy spectrum measurement of particles,achieving an energy resolution of 2.98％.When the reduced field strength E/P at the front of the anode is approximately 5 V·mm-1·hPa-1,the pulse signal gain is approximately 7 times.
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