For the R&D of the target station of C-ADS, especially for the conceptual design and feasibility verification of the initiative dense gravity-driven granular flow driven target, a special-purpose program which is ...For the R&D of the target station of C-ADS, especially for the conceptual design and feasibility verification of the initiative dense gravity-driven granular flow driven target, a special-purpose program which is accurate and with a sufficiently high efficiency is needed.展开更多
Both proton beam energy and target parameters play dominant roles on the neutron production multiplicity for a spallation neutron source target. The neutron production multiplicity is undoubtedly the most interesting ...Both proton beam energy and target parameters play dominant roles on the neutron production multiplicity for a spallation neutron source target. The neutron production multiplicity is undoubtedly the most interesting quantity for spallation target designers. In addition to neutron multiplicity, the beam energy cost per neutron is also an important parameter when designing an ADS facility.展开更多
The China-ADS project is a strategic plan launched by the Chinese Academy of Sciences to solve the nuclear waste problem and the resource problem for nuclear power in China. Under its long-term plan, it will last unti...The China-ADS project is a strategic plan launched by the Chinese Academy of Sciences to solve the nuclear waste problem and the resource problem for nuclear power in China. Under its long-term plan, it will last until about 2040. In order to achieve the extremely high reliability and availability required for the C-ADS accelerator, a fault tolerant strategy has been implanted. The failure effects of key elements such as the RF cavities and focusing elements in different locations of the injector-I part have been studied and schemes of compensation based on the local compensation-rematch method have been proposed. In addition, error analysis has been carried out to check the reliability of this method compared with the uncompensated situation, and it is found to be very effective. As the injector-I testing facility is coming into operation, it is possible to check and improve the compensation-rematch method with the beam testing experiment before the main linac operation.展开更多
The China ADS（C-ADS） project proposes to build a 1000 MW Accelerator Driven sub-critical System around 2032. The accelerator will work in CW mode with 10 mA in beam current and 1.5 GeV in final beam energy. The lina...The China ADS（C-ADS） project proposes to build a 1000 MW Accelerator Driven sub-critical System around 2032. The accelerator will work in CW mode with 10 mA in beam current and 1.5 GeV in final beam energy. The linac is composed of two major sections： the injector section and the main linac section. There are two diferent schemes for the injector section. The Injector-scheme is based on a 325 MHz RFQ and superconducting spoke cavities of the same RF frequency and the Injector-scheme is based on a 162.5 MHz RFQ and superconducting HWR cavities of the same frequency. The main linac design will be diferent for diferent injector choices. The two diferent designs for the main linac have been studied according to the beam characteristics from the diferent injector schemes.展开更多
The ADS accelerator in China is a Continuous-Wave （CW） proton linac with 1.5 GeV beam energy, 10 mA Imam current, and 15 MW beam power. To meet the extremely low beam loss rate and high reliability requirements, it ...The ADS accelerator in China is a Continuous-Wave （CW） proton linac with 1.5 GeV beam energy, 10 mA Imam current, and 15 MW beam power. To meet the extremely low beam loss rate and high reliability requirements, it is very important to study the beam halo caused by beam mismatch, which is one major sources of beam loss. To avoid envelope instability, the phase advances per period are all smaller than 90 degrees in the main linac design. In this paper, simulation results of the emittanee growth and the envelope oscillations caused by mismatch in the main linac sect;ion are presented. To meet the emittanee growth requirement, the transverse and longitudinal mismatch factors should be smaller than 0.4 and 0.3, respectively.展开更多
The linac to the transmuter beam transport line （LTBT） connecting the end of the linac to the spallation target is a critical sub-system in the accelerator driven system （ADS）. It has the function of transporting ...The linac to the transmuter beam transport line （LTBT） connecting the end of the linac to the spallation target is a critical sub-system in the accelerator driven system （ADS）. It has the function of transporting the accel-erated high power proton beam to the target with a beam footprint satisfying the special requirements of the minor actinide （MA） transmuter. In this paper, a preliminary conceptual design of the hurling magnet to transmuter beam transport section （HTBT）, as a part of the LTBT, for the China ADS （C-ADS） system is proposed and developed. In this design, a novel hurling magnet with a two dimensional amplitude modulation （AM） of 1 kHz and scanning of more than 10 kHz at 360 in transverse directions is used to realize a 300 mm diameter uniform distribution of beam on target. The preliminary beam optics design of C-ADS HTBT optimized to minimize the beam loss on the vacuum chamber and the radiation damage caused by back-scattering neutrons will be reported.展开更多
The injector of C-ADS （Chinese Accelerator Driven Sub-critical System） project is a high current, fully super-conducting proton accelerator. Meanwhile, a BLM system is indispensable for this facility, especially in ...The injector of C-ADS （Chinese Accelerator Driven Sub-critical System） project is a high current, fully super-conducting proton accelerator. Meanwhile, a BLM system is indispensable for this facility, especially in low energy segments. This paper presents some basic simulations for 10 MeV proton by Monte Carlo program FLUKA, as well as the distributions on different secondary particles in three aspects： angular, energy spectrum, and current. These results are beneficial to selecting the detector type and its location and determining its dynamic range matching different requirements for both fast and slow beam loss. Furthermore, in this paper the major impact of the background is also analyzed, such as superconducting cavity X radiation and radiation caused by material activation. This work is meaningful in BLM system research.展开更多
In a long-term planning for neutrino experiments in China, a medium baseline neutrino beam is proposed which uses a continue wave（CW） superconducting linac of 15 MW in beam power as the proton driver. The linac will...In a long-term planning for neutrino experiments in China, a medium baseline neutrino beam is proposed which uses a continue wave（CW） superconducting linac of 15 MW in beam power as the proton driver. The linac will be based on the technologies which are under development by the China-ADS project, namely it is also composed of a3.2 Me V normal conducting RFQ and five different types of superconducting cavities. However, the design philosophy is quite different from the China-ADS linac because of the much weaker requirement on reliability here. The nominal design energy and current are 1.5 Ge V and 10 m A, respectively. The general considerations and preliminary results on the physics design will be presented here. In addition, the alternative designs such as 2.0 Ge V and 2.5 Ge V, which may be required by the general design, can be easily extended from the nominal one.展开更多
文摘For the R&D of the target station of C-ADS, especially for the conceptual design and feasibility verification of the initiative dense gravity-driven granular flow driven target, a special-purpose program which is accurate and with a sufficiently high efficiency is needed.
文摘Both proton beam energy and target parameters play dominant roles on the neutron production multiplicity for a spallation neutron source target. The neutron production multiplicity is undoubtedly the most interesting quantity for spallation target designers. In addition to neutron multiplicity, the beam energy cost per neutron is also an important parameter when designing an ADS facility.
基金Supported by National Natural Science Foundation of China(Projects 11235012,11475201)the China ADS Project(XDA03020000)
文摘The China-ADS project is a strategic plan launched by the Chinese Academy of Sciences to solve the nuclear waste problem and the resource problem for nuclear power in China. Under its long-term plan, it will last until about 2040. In order to achieve the extremely high reliability and availability required for the C-ADS accelerator, a fault tolerant strategy has been implanted. The failure effects of key elements such as the RF cavities and focusing elements in different locations of the injector-I part have been studied and schemes of compensation based on the local compensation-rematch method have been proposed. In addition, error analysis has been carried out to check the reliability of this method compared with the uncompensated situation, and it is found to be very effective. As the injector-I testing facility is coming into operation, it is possible to check and improve the compensation-rematch method with the beam testing experiment before the main linac operation.
文摘The China ADS（C-ADS） project proposes to build a 1000 MW Accelerator Driven sub-critical System around 2032. The accelerator will work in CW mode with 10 mA in beam current and 1.5 GeV in final beam energy. The linac is composed of two major sections： the injector section and the main linac section. There are two diferent schemes for the injector section. The Injector-scheme is based on a 325 MHz RFQ and superconducting spoke cavities of the same RF frequency and the Injector-scheme is based on a 162.5 MHz RFQ and superconducting HWR cavities of the same frequency. The main linac design will be diferent for diferent injector choices. The two diferent designs for the main linac have been studied according to the beam characteristics from the diferent injector schemes.
基金Supported by China ADS Project(XDA03020000)National Natural Science Foundation of China(11235012)
文摘The ADS accelerator in China is a Continuous-Wave （CW） proton linac with 1.5 GeV beam energy, 10 mA Imam current, and 15 MW beam power. To meet the extremely low beam loss rate and high reliability requirements, it is very important to study the beam halo caused by beam mismatch, which is one major sources of beam loss. To avoid envelope instability, the phase advances per period are all smaller than 90 degrees in the main linac design. In this paper, simulation results of the emittanee growth and the envelope oscillations caused by mismatch in the main linac sect;ion are presented. To meet the emittanee growth requirement, the transverse and longitudinal mismatch factors should be smaller than 0.4 and 0.3, respectively.
基金Supported by National Natural Science Foundation of China (11045003, 10975150)
文摘The linac to the transmuter beam transport line （LTBT） connecting the end of the linac to the spallation target is a critical sub-system in the accelerator driven system （ADS）. It has the function of transporting the accel-erated high power proton beam to the target with a beam footprint satisfying the special requirements of the minor actinide （MA） transmuter. In this paper, a preliminary conceptual design of the hurling magnet to transmuter beam transport section （HTBT）, as a part of the LTBT, for the China ADS （C-ADS） system is proposed and developed. In this design, a novel hurling magnet with a two dimensional amplitude modulation （AM） of 1 kHz and scanning of more than 10 kHz at 360 in transverse directions is used to realize a 300 mm diameter uniform distribution of beam on target. The preliminary beam optics design of C-ADS HTBT optimized to minimize the beam loss on the vacuum chamber and the radiation damage caused by back-scattering neutrons will be reported.
文摘The injector of C-ADS （Chinese Accelerator Driven Sub-critical System） project is a high current, fully super-conducting proton accelerator. Meanwhile, a BLM system is indispensable for this facility, especially in low energy segments. This paper presents some basic simulations for 10 MeV proton by Monte Carlo program FLUKA, as well as the distributions on different secondary particles in three aspects： angular, energy spectrum, and current. These results are beneficial to selecting the detector type and its location and determining its dynamic range matching different requirements for both fast and slow beam loss. Furthermore, in this paper the major impact of the background is also analyzed, such as superconducting cavity X radiation and radiation caused by material activation. This work is meaningful in BLM system research.
基金Supported by National Natural Science Foundation of China(11375122,91126003,11235012)
文摘In a long-term planning for neutrino experiments in China, a medium baseline neutrino beam is proposed which uses a continue wave（CW） superconducting linac of 15 MW in beam power as the proton driver. The linac will be based on the technologies which are under development by the China-ADS project, namely it is also composed of a3.2 Me V normal conducting RFQ and five different types of superconducting cavities. However, the design philosophy is quite different from the China-ADS linac because of the much weaker requirement on reliability here. The nominal design energy and current are 1.5 Ge V and 10 m A, respectively. The general considerations and preliminary results on the physics design will be presented here. In addition, the alternative designs such as 2.0 Ge V and 2.5 Ge V, which may be required by the general design, can be easily extended from the nominal one.
