The position effect of the photoelectron multiplier tube （PMT） of the electromagnetic calorimeter （ECAL） of Alpha Magnetic Spectrometer-02 （AMS-02） has been studied with beam-test data. The reconstructed deposit...The position effect of the photoelectron multiplier tube （PMT） of the electromagnetic calorimeter （ECAL） of Alpha Magnetic Spectrometer-02 （AMS-02） has been studied with beam-test data. The reconstructed deposited energy in a layer versus incidence position in the cell can be described by Gaussian distribution, maximum and minimum value can be obtained when the particle passes across the center and the edge of a cell respectively. The distribution can be used to correct the effect of incidence position on energy reconstruction. Much better energy resolution was acquired be got with the correction, for 100 GeV electrons, energy resolution improved from 3% to 2%.展开更多
基金Supported by National Natural Science Foundation of China (10805050)
文摘The position effect of the photoelectron multiplier tube （PMT） of the electromagnetic calorimeter （ECAL） of Alpha Magnetic Spectrometer-02 （AMS-02） has been studied with beam-test data. The reconstructed deposited energy in a layer versus incidence position in the cell can be described by Gaussian distribution, maximum and minimum value can be obtained when the particle passes across the center and the edge of a cell respectively. The distribution can be used to correct the effect of incidence position on energy reconstruction. Much better energy resolution was acquired be got with the correction, for 100 GeV electrons, energy resolution improved from 3% to 2%.
