The development of the Half Wave Resonator (HWR010) is based on the China ADS project. The HWR010 operates at 162.5 MHz and can provide more than 0.78 MV of accelerating voltage per cavity for proton with opt=0.10. Th...The development of the Half Wave Resonator (HWR010) is based on the China ADS project. The HWR010 operates at 162.5 MHz and can provide more than 0.78 MV of accelerating voltage per cavity for proton with opt=0.10. The goal of the RF properties is to get a lower heat load and a higher accelerating gradient, which are determined by a higher R/Q0 and lower peak surface fields (Bpk/Eacc and Epk/Eacc). In order to optimize the HWR geometry parameters, CST-MWS is used to conduct the RF simulation. The optimized RF parameters are show in Table 1.展开更多
Multicell superconducting radio frequency(SRF)elliptical cavities are proposed for efficient acceleration of proton beam in the Chinese initiative Accelerator Driven Subcritical System(CiADS).
The cavity design including RF design and multi-physics analysis of the RFQ for the CAFe(Chinese Accelerator Facility for super-heavy Elements)project have been completed by the end of 2019.
A Quarter Wave Resonator(QWR)has been designed for the HIAF(High Intensity heavy ion Accelerator Facility)project.Working at 81.25 MHz,the QWR accelerates heavy ion beams from 0.8 to 5.3 MeV in the high Intensity heav...A Quarter Wave Resonator(QWR)has been designed for the HIAF(High Intensity heavy ion Accelerator Facility)project.Working at 81.25 MHz,the QWR accelerates heavy ion beams from 0.8 to 5.3 MeV in the high Intensity heavy ion superconducting LINAC section of HIAF.展开更多
In 2018,detailed studies on RF induced plasma for the in-situ cleaning of the HWR cavity were conducted to improve the performance of the cavity.For the purpose of cleaning the HWR cavities in cryomodule,an apparatus ...In 2018,detailed studies on RF induced plasma for the in-situ cleaning of the HWR cavity were conducted to improve the performance of the cavity.For the purpose of cleaning the HWR cavities in cryomodule,an apparatus for the discharge experiments was designed at room temperature,which duplicates the assembly of cavities inside cryomodule,where the FPC was used for power coupling.展开更多
SRF cavities are the common accelerating structures for many accelerators nowadays.Since a series of external loads on the resonator walls predetermine the main working conditions of the SC cavities,the detailed inves...SRF cavities are the common accelerating structures for many accelerators nowadays.Since a series of external loads on the resonator walls predetermine the main working conditions of the SC cavities,the detailed investigation of their mechanical properties should be conducted in parallel with the main RF design.The effects of very high electromagnetic fields that result in strong Lorentz forces and the pressure on cavity walls from the helium tank that also deforms the cavity shape,the tuning scheme resulting in the change of accelerating field profile and mechanical eigen resonance of cavities which are the main source of the microphonics must be taken into account during integrated design of the resonator and its liquid helium vessel.展开更多
The pilot ADS project hosted by IMP and IHEP,which aims to produce a CW proton beam with beam current 10 mA@25 MeV,has successfully ejected out a pulsed proton beam with beam current 12.6 mA@26.1 MeV.It has four cryom...The pilot ADS project hosted by IMP and IHEP,which aims to produce a CW proton beam with beam current 10 mA@25 MeV,has successfully ejected out a pulsed proton beam with beam current 12.6 mA@26.1 MeV.It has four cryomodules,totally 22 superconducting cavities.The first two cryomodules,each consists of six Half Wave Resonators(HWRs)with=0.1,have the same structure.The third cryomodule is made up of five tapered HWRs with=0.15.The first three cryomodules are supplied by IMP and the fourth one by IHEP,which consists of five elliptical cavities with=0.21.This paper will show some interesting results about cavity string assembling in cleanroom and the onset of field emission.展开更多
Field emission occurred in superconducting radio-frequency(SRF)cavities is the major obstacle of the accelerators operating at high gradient,which partly caused by the inner surface contamination,such as the hydrocarb...Field emission occurred in superconducting radio-frequency(SRF)cavities is the major obstacle of the accelerators operating at high gradient,which partly caused by the inner surface contamination,such as the hydrocarbons and the absorbed residual gas.The plasma processing can be an effective method to solve the field emission issues.The properties of low temperature glow discharge,which was argon plasma with the chemically reactive oxygen,were investigated for the SRF cavities used for CADS project.展开更多
The high power superconducting radiofrequency(SRF)input coupler is the connecting part between the SRF cavity and the RF transmission line.With the RF power transferred through the coupler,the SRF cavity can built up ...The high power superconducting radiofrequency(SRF)input coupler is the connecting part between the SRF cavity and the RF transmission line.With the RF power transferred through the coupler,the SRF cavity can built up the electromagnetic field and then accelerate the beams.In addition to this RF transmission function,it also has to serve as a vacuum barrier for the SRF cavity vacuum.The HWR010 coupler which designed by IHEP is a single ceramic window coupler.展开更多
文摘The development of the Half Wave Resonator (HWR010) is based on the China ADS project. The HWR010 operates at 162.5 MHz and can provide more than 0.78 MV of accelerating voltage per cavity for proton with opt=0.10. The goal of the RF properties is to get a lower heat load and a higher accelerating gradient, which are determined by a higher R/Q0 and lower peak surface fields (Bpk/Eacc and Epk/Eacc). In order to optimize the HWR geometry parameters, CST-MWS is used to conduct the RF simulation. The optimized RF parameters are show in Table 1.
文摘Multicell superconducting radio frequency(SRF)elliptical cavities are proposed for efficient acceleration of proton beam in the Chinese initiative Accelerator Driven Subcritical System(CiADS).
文摘The cavity design including RF design and multi-physics analysis of the RFQ for the CAFe(Chinese Accelerator Facility for super-heavy Elements)project have been completed by the end of 2019.
文摘A Quarter Wave Resonator(QWR)has been designed for the HIAF(High Intensity heavy ion Accelerator Facility)project.Working at 81.25 MHz,the QWR accelerates heavy ion beams from 0.8 to 5.3 MeV in the high Intensity heavy ion superconducting LINAC section of HIAF.
文摘In 2018,detailed studies on RF induced plasma for the in-situ cleaning of the HWR cavity were conducted to improve the performance of the cavity.For the purpose of cleaning the HWR cavities in cryomodule,an apparatus for the discharge experiments was designed at room temperature,which duplicates the assembly of cavities inside cryomodule,where the FPC was used for power coupling.
文摘SRF cavities are the common accelerating structures for many accelerators nowadays.Since a series of external loads on the resonator walls predetermine the main working conditions of the SC cavities,the detailed investigation of their mechanical properties should be conducted in parallel with the main RF design.The effects of very high electromagnetic fields that result in strong Lorentz forces and the pressure on cavity walls from the helium tank that also deforms the cavity shape,the tuning scheme resulting in the change of accelerating field profile and mechanical eigen resonance of cavities which are the main source of the microphonics must be taken into account during integrated design of the resonator and its liquid helium vessel.
文摘The pilot ADS project hosted by IMP and IHEP,which aims to produce a CW proton beam with beam current 10 mA@25 MeV,has successfully ejected out a pulsed proton beam with beam current 12.6 mA@26.1 MeV.It has four cryomodules,totally 22 superconducting cavities.The first two cryomodules,each consists of six Half Wave Resonators(HWRs)with=0.1,have the same structure.The third cryomodule is made up of five tapered HWRs with=0.15.The first three cryomodules are supplied by IMP and the fourth one by IHEP,which consists of five elliptical cavities with=0.21.This paper will show some interesting results about cavity string assembling in cleanroom and the onset of field emission.
文摘Field emission occurred in superconducting radio-frequency(SRF)cavities is the major obstacle of the accelerators operating at high gradient,which partly caused by the inner surface contamination,such as the hydrocarbons and the absorbed residual gas.The plasma processing can be an effective method to solve the field emission issues.The properties of low temperature glow discharge,which was argon plasma with the chemically reactive oxygen,were investigated for the SRF cavities used for CADS project.
文摘The high power superconducting radiofrequency(SRF)input coupler is the connecting part between the SRF cavity and the RF transmission line.With the RF power transferred through the coupler,the SRF cavity can built up the electromagnetic field and then accelerate the beams.In addition to this RF transmission function,it also has to serve as a vacuum barrier for the SRF cavity vacuum.The HWR010 coupler which designed by IHEP is a single ceramic window coupler.
