Correction to:Radiation Detection Technology and Methods(2024)8:1-1105.https://doi.org/10.1007/s41605-024-00463-y.In this article all authors name was missing in the springer link.It has been corrected.The original ar...Correction to:Radiation Detection Technology and Methods(2024)8:1-1105.https://doi.org/10.1007/s41605-024-00463-y.In this article all authors name was missing in the springer link.It has been corrected.The original article has been corrected.展开更多
The Circular Electron Positron Collider(CEPC)is a large scientific project initiated and hosted by China,fostered through extensive collaboration with international partners.The complex comprises four accelerators:a 3...The Circular Electron Positron Collider(CEPC)is a large scientific project initiated and hosted by China,fostered through extensive collaboration with international partners.The complex comprises four accelerators:a 30 GeV Linac,a 1.1 GeV Damping Ring,a Booster capable of achieving energies up to 180 GeV,and a Collider operating at varying energy modes(Z,W,H,and tt).The Linac and Damping Ring are situated on the surface,while the subterranean Booster and Collider are housed in a 100 km circumference underground tunnel,strategically accommodating future expansion with provisions for a potential Super Proton Proton Collider(SPPC).The CEPC primarily serves as a Higgs factory.In its baseline design with synchrotron radiation(SR)power of 30 MW per beam,it can achieve a luminosity of 5×10^(34)cm^(-2)s^(-1)per interaction point(IP),resulting in an integrated luminosity of 13 ab^(-1)for two IPs over a decade,producing 2.6 million Higgs bosons.Increasing the SR power to 50 MW per beam expands the CEPC's capability to generate 4.3 million Higgs bosons,facilitating precise measurements of Higgs coupling at sub-percent levels,exceeding the precision expected from the HL-LHC by an order of magnitude.This Technical Design Report(TDR)follows the Preliminary Conceptual Design Report(Pre-CDR,2015)and the Conceptual Design Report(CDR,2018),comprehensively detailing the machine's layout,performance metrics,physical design and analysis,technical systems design,R&D and prototyping efforts,and associated civil engineering aspects.Additionally,it includes a cost estimate and a preliminary construction timeline,establishing a framework for forthcoming engineering design phase and site selection procedures.Construction is anticipated to begin around 2027-2028,pending government approval,with an estimated duration of 8 years.The commencement of experiments and data collection could potentially be initiated in the mid-2030s.展开更多
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
Introduction Non-evaporable getter is now widely employed in many accelerators to mitigate the resistive-wall effect of the Ti-Zr-V getter coated vacuum chambers in the next generation accelerators.Methods and discuss...Introduction Non-evaporable getter is now widely employed in many accelerators to mitigate the resistive-wall effect of the Ti-Zr-V getter coated vacuum chambers in the next generation accelerators.Methods and discussions Quaternary Ti-Zr-V-Cu getter films were deposited by direct current(DC)magnetron sputtering.The DC/high frequency impedance and activation kinetics were investigated by four-probes/waveguide methods and in situ synchrotron radiation photoelectron spectroscopy(SRPES).Conclusions Compared to Ti-Zr-V films,Ti-Zr-V-Cu films showed better conductivity,which is beneficial to eliminate the resistive-wall effect.However,its initial activation temperature is above 200℃,and it needs to be activated at a higher temperature to achieve the required pumping performance.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
文摘Correction to:Radiation Detection Technology and Methods(2024)8:1-1105.https://doi.org/10.1007/s41605-024-00463-y.In this article all authors name was missing in the springer link.It has been corrected.The original article has been corrected.
基金support from diverse funding sources,including the National Key Program for S&T Research and Development of the Ministry of Science and Technology(MOST),Yifang Wang's Science Studio of the Ten Thousand Talents Project,the CAS Key Foreign Cooperation Grant,the National Natural Science Foundation of China(NSFC)Beijing Municipal Science&Technology Commission,the CAS Focused Science Grant,the IHEP Innovation Grant,the CAS Lead Special Training Programthe CAS Center for Excellence in Particle Physics,the CAS International Partnership Program,and the CAS/SAFEA International Partnership Program for Creative Research Teams.
文摘The Circular Electron Positron Collider(CEPC)is a large scientific project initiated and hosted by China,fostered through extensive collaboration with international partners.The complex comprises four accelerators:a 30 GeV Linac,a 1.1 GeV Damping Ring,a Booster capable of achieving energies up to 180 GeV,and a Collider operating at varying energy modes(Z,W,H,and tt).The Linac and Damping Ring are situated on the surface,while the subterranean Booster and Collider are housed in a 100 km circumference underground tunnel,strategically accommodating future expansion with provisions for a potential Super Proton Proton Collider(SPPC).The CEPC primarily serves as a Higgs factory.In its baseline design with synchrotron radiation(SR)power of 30 MW per beam,it can achieve a luminosity of 5×10^(34)cm^(-2)s^(-1)per interaction point(IP),resulting in an integrated luminosity of 13 ab^(-1)for two IPs over a decade,producing 2.6 million Higgs bosons.Increasing the SR power to 50 MW per beam expands the CEPC's capability to generate 4.3 million Higgs bosons,facilitating precise measurements of Higgs coupling at sub-percent levels,exceeding the precision expected from the HL-LHC by an order of magnitude.This Technical Design Report(TDR)follows the Preliminary Conceptual Design Report(Pre-CDR,2015)and the Conceptual Design Report(CDR,2018),comprehensively detailing the machine's layout,performance metrics,physical design and analysis,technical systems design,R&D and prototyping efforts,and associated civil engineering aspects.Additionally,it includes a cost estimate and a preliminary construction timeline,establishing a framework for forthcoming engineering design phase and site selection procedures.Construction is anticipated to begin around 2027-2028,pending government approval,with an estimated duration of 8 years.The commencement of experiments and data collection could potentially be initiated in the mid-2030s.
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supported by High Energy Photon Source(HEPS),a major national science and technology infrastructure,and Xie Jialin Research Fund(No.E2546HU210)National Development and Reform Commission(2017)No.2173。
文摘Introduction Non-evaporable getter is now widely employed in many accelerators to mitigate the resistive-wall effect of the Ti-Zr-V getter coated vacuum chambers in the next generation accelerators.Methods and discussions Quaternary Ti-Zr-V-Cu getter films were deposited by direct current(DC)magnetron sputtering.The DC/high frequency impedance and activation kinetics were investigated by four-probes/waveguide methods and in situ synchrotron radiation photoelectron spectroscopy(SRPES).Conclusions Compared to Ti-Zr-V films,Ti-Zr-V-Cu films showed better conductivity,which is beneficial to eliminate the resistive-wall effect.However,its initial activation temperature is above 200℃,and it needs to be activated at a higher temperature to achieve the required pumping performance.
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.
