Abstract
The 10 MeV accelerator-driven subcritical system (ADS) Injector I test stand at Institute of High Energy Physics (IHEP) is a testing facility dedicated to demonstrate one of the two injector design schemes [Injector Scheme-I, which works at 325 MHz], for the ADS project in China. The injector is composed of two parts, the linac part and the beam dump line. The former is designed on the basis of 325 MHz four-vane type copper structure radio frequency quadrupole and superconducting (SC) spoke cavities with beta = 0.12. The latter is designed to transport the beamcoming out of the SC section of the linac to the beam dump, where the beam transverse profile is fairly enlarged and unformed to simplify the beam target design. The SC section consists of two cryomodules with 14 beta = 0.12 Spoke cavities, 14 solenoid and 14 BPMs in total. The first challenge in the physics design comes from the necessary space required for the cryomodule separation where the periodical lattice is destroyed at a relatively lower energy of similar to 5 MeV. Another challenge is the beam dump line design, as it will be the first beam dump line being built by using a step field magnet for the transverse beam expansion and uniformity in the world. This paper gives an overview of the physics design study together with the design principles and machine construction considerations. The results of an optimized design, fabrication status and end to end simulations including machine errors are presented.
Highlights
China ADS project is developing the concept and design of a 1.5 GeV high intensity superconducting (SC) linac with the aim of building a demonstration facility for the accelerator-driven subcritical system (ADS) in multiple phases lasting about 20 years
The paper present the physics design and the fabrication status of the ADS Injector I test stand in Institute of High Energy Physics (IHEP)
90% duty factor had been achieved with 92% beam transmission out of the radio frequency quadrupole (RFQ)
Summary
China ADS project is developing the concept and design of a 1.5 GeV high intensity superconducting (SC) linac with the aim of building a demonstration facility for the accelerator-driven subcritical system (ADS) in multiple phases lasting about 20 years. The driver linac will be operating in continuous wave (cw) mode and delivering 15 MW beam power eventually. The linac includes two major sections: the injector section and the main linac section. The injectors accelerate the proton beams up to 10 MeV and the main linac boosts the energy from 10 MeV up to 1.5 GeV. To satisfy the restricted stability and reliability command [1] of the linac in the lower energy part, there will be two identical injectors operating paralleled backing up for each other. Two different design schemes for the injectors are proposed [2,3], with scheme I (so-called Injector I) based on 325 MHz
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