Introduction The pumping performance of getter materials has becoming one of the hotspots in accelerator field.The recovery of pumping performance after air venting,also called aging effect,is important for applicatio...Introduction The pumping performance of getter materials has becoming one of the hotspots in accelerator field.The recovery of pumping performance after air venting,also called aging effect,is important for applications in accelerators.Materials and methods In this work,we investigated the aging effect of Ti-V-Zr-Hf-and Ti-V-Zr-coated copper tubular chambers,and the effect of initial air exposure time on the aging properties.The samples presented hierarchically micro/nano-structures and showed a featured aging curve,giving about 9 effective pumping cycles.Conclusion The pumping performance is inversely correlated with air exposure time suggesting that the getter coated cham-bers should be properly preserved before applied as a"pump".展开更多
Background In High Energy Photon Source(HEPS)the beam vacuum pipes employ TiZrVHf non-evaporable getter(NEG)coatings in order to meet the operation requirements.In many occasions it is inevitable to bring the sectors ...Background In High Energy Photon Source(HEPS)the beam vacuum pipes employ TiZrVHf non-evaporable getter(NEG)coatings in order to meet the operation requirements.In many occasions it is inevitable to bring the sectors to atmosphere in order to open detectors,insert or change faulty parts.Consequently,NEG coatings will be saturated and followed with activation to restore the vacuum.Such an intervention would require heating up the whole sector to hundreds of degree and last from 2 to 4 weeks.Purpose Therefore,a Neon venting system is developed in HEPS in order to perform fast interventions without losing much of the performance of the activated NEG coating.Methods Preliminary experiments has been carried out to test the venting with Neon of different purity by comparing pumping speed lost and vacuum recovery before and after Neon venting.Results Results show that Neon with ultrahigh purity(purified by NEG cartridge purifier)could preserve full pumping performance of the NEG coated pipes.Neon with 6 N purity could preserve half pumping performance of the NEG coated pipes,but vacuum could be fully restored in only 2 days.Neon with 5 N purity could saturate the NEG coated pipes,leading to full pumping performance lost.Therefore,Neon with 6 N purity or above is promising in applications of efficient operations in HEPS.展开更多
基金supported by High Energy Photon Source(HEPS),a major national science and technology infrastructureprovided by National Development and Reform Commission(Grant No.发改高技(2017)2173号)
文摘Introduction The pumping performance of getter materials has becoming one of the hotspots in accelerator field.The recovery of pumping performance after air venting,also called aging effect,is important for applications in accelerators.Materials and methods In this work,we investigated the aging effect of Ti-V-Zr-Hf-and Ti-V-Zr-coated copper tubular chambers,and the effect of initial air exposure time on the aging properties.The samples presented hierarchically micro/nano-structures and showed a featured aging curve,giving about 9 effective pumping cycles.Conclusion The pumping performance is inversely correlated with air exposure time suggesting that the getter coated cham-bers should be properly preserved before applied as a"pump".
基金The funding was provided by National Development and Reform Commission Grand No.((2017)2173).
文摘Background In High Energy Photon Source(HEPS)the beam vacuum pipes employ TiZrVHf non-evaporable getter(NEG)coatings in order to meet the operation requirements.In many occasions it is inevitable to bring the sectors to atmosphere in order to open detectors,insert or change faulty parts.Consequently,NEG coatings will be saturated and followed with activation to restore the vacuum.Such an intervention would require heating up the whole sector to hundreds of degree and last from 2 to 4 weeks.Purpose Therefore,a Neon venting system is developed in HEPS in order to perform fast interventions without losing much of the performance of the activated NEG coating.Methods Preliminary experiments has been carried out to test the venting with Neon of different purity by comparing pumping speed lost and vacuum recovery before and after Neon venting.Results Results show that Neon with ultrahigh purity(purified by NEG cartridge purifier)could preserve full pumping performance of the NEG coated pipes.Neon with 6 N purity could preserve half pumping performance of the NEG coated pipes,but vacuum could be fully restored in only 2 days.Neon with 5 N purity could saturate the NEG coated pipes,leading to full pumping performance lost.Therefore,Neon with 6 N purity or above is promising in applications of efficient operations in HEPS.
