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A plasma generator based on hollow cathode discharge(HCD)has been designed and installed on the linear magnetic device,for the researches on helium and hydrogen plasma interaction with plasma facing components.The performances of the hollow cathode source for argon/helium/hydrogen discharges will be introduced in this presentation.The plasma parameters have been measured by Langmuir probe and visible spectrometer on a linear magnetic device.It shows that this hollow cathode source has very high gas efficiency and energy efficiency.