辐射环境残余气体分析仪的研制与应用OA

To satisfy the online monitoring demands of high-radiation vacuum facilities including synchrotron radiation devices and fusion reactors,conventional residual gas analyzers(RGAs)fail to achieve long-term stable operation.A split radiation-hardened RGA was developed and its structural design,performance and engineering applicability were systematically investigated in this work.The quadrupole probe and other core components were placed in high-radiation regions,and the electronic unit was remotely connected through long cables to reduce radiation damage.Performance tests following GB/Z 42625-2023 showed that the ion source sensitivity was 2.04×10–6 A/Pa.The system could recognize H2,He,N2,Kr,Xe,Ar and other standard gases,whose characteristic peaks agreed well with theoretical mass-to-charge ratios.Gamma irradiation experiments were implemented at 100 Gy/h,with cumulative doses of 5250 Gy on the probe and 300 Gy on electronics.The electron multiplier exhibited persistent gain degradation under prolonged irradiation,and elevated working voltage could not restore its original performance.On-site experiments were conducted on a SSRF beamline at 50 Gy/h and 6.27×10–6 Pa for real-time gas monitoring under beam-on and beam-off conditions.Significant desorption occurred during beam operation accompanied by the increased CO and CO2 partial pressures,and all partial pressures decreased after beam cutoff.Experimental results confirmed that the proposed RGA could realize reliable gas measurement under strong radiation and characterize the combined effect of photon-stimulated and electron-stimulated desorption.This work offered a long-duration online residual gas monitoring scheme for synchrotron light sources,fusion reactors and high-energy accelerators.