ADTF spoke cavity cryomodule concept

Abstract

The Accelerator Driven Test Facility (ADTF) is being developed as a reactor concepts test bed for transmutation of nuclear waste. A 13.3 mA continuous-wave (CW) proton beam will be accelerated to 600 MeV and impinged on a spallation target. The subsequent neutron shower is used to create a nuclear reaction within a subcritical assembly of waste material that reduces the waste half-life from the order of 10 5 years to 10 2 years. Additionally, significant energy is produced that can be used to generate electrical power.The ADTF proton accelerator consists of room-temperature (RT) structures that accelerate the beam to 6.7-MeV and superconducting (SC) elements that boost the beam's energy to 600-MeV. Traditional SC elliptical cavities experience structural difficulties at low energies due to their geometry. Therefore, stiff-structured SC spoke cavities have been adopted for the energy range between 6.7 and 109 MeV. Elliptical cavities are used at the higher energies. This paper describes a multi-spoke-cavity cryomodule concept for ADTF.

Updating the CSNS injector linac to 250 MeV with superconducting double-spoke cavities

“…The main parameters for the elements distribution are described as follows. The distance between two cavities is reserved as 300 mm for the installation of the helium tank and the tuner with reference to the design of ProjectX [15] and ADTF [16], in which 240 mm and 300 mm are reserved, respectively; 500 mm on both sides of the cryomodules are reserved for temperature transition. Because the quadrupoles are used as transverse focusing elements in the upstream DTL sections, it is a natural choice to use quadrupoles as transverse elements in the superconducting section.…”