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Liquid Electronuclear Target

#1444


Model of Liquid Electronuclear Target with Supersonic Wind Shutter

Tech Area / Field

  • PHY-PFA/Particles, Fields and Accelerator Physics/Physics

Status
3 Approved without Funding

Registration date
26.01.1999

Leading Institute
ITEF (ITEP), Russia, Moscow

Project summary

The goal of the project being proposed is experimental and analytical substantiation of the liquid electronuclear target with supersonic wind shutter for Accelerator Driven Systems, ADS. ADS is considered as a real opportunity to increase nuclear power generation safety through development of nuclear reactors which operate in subcritical mode and transmute the fuel cycle long-lived radioactive waste. The ADS concept was elaborated on the basis of technologies that have been developed for military-purpose nuclear material production.

The present proposal relates to one of the key ADS component - electronuclear target which absorbs the energy of the medium energy proton beam generated in accelerator and converts it into neutrons.

One of the target’s primary function is also to separate the accelerator’s evacuated internal space from volumes of the target and blanket per se which are under pressure.

The function of complete absorption and removal of the beam power in the order of hundreds megawatts with proton energy in the order of 1 GeV calls for setting up a stable steady flow of the coolant within the distance of no less than 1–2 m which is nontrivial problem because of the possible effects of instability, cavitation, discontinuity in the flow cross-section, etc. Origination of these effects could be facilitated by high vacuum within target’s volume.

The separation function of the target and evacuated ion line volumes assumes either existence of the “first wal” or development of another device that ensures its accomplishment. The solid first wall is one of the facility’s prime component that provides security on the one hand, and one of the most thermomechanical- and radiation-stressed component on the other hand. The possible way out of this conflict lies in developing the supersonic wind shutter device between target and evacuated ion line instead of a solid wall. This shutter device will lower the pressure by approximately two orders of magnitude, from ~ 0.1 physical atmosphere in the target to ~ 10-3 physical atmosphere in the evacuated ion line which is acceptable for accelerator’s evacuation system.

On the basis of gas- and hydraulic dynamic workbenches a combined experimental workbench will be constructed - a model of the liquid electronuclear target with supersonic wind shutter, experimental studies of the gas and liquid flow in the model will be conducted, distributions of the main hydrodynamic and heat-physical parameters of flows and related channels geometry dependence will be measured. Related calculations and comparison with experiment will be made using computer programs for numeric analysis of the gas and liquid flows in channels. On the basis of obtained experimental and calculation data recomendations will be elaborated for designing a prototype of the full-scale electronuclear target.

Potential role of foreign collaborators: Concerned foreign collaborators will participate in developing the program of experimental and calculation studies and analysis of results of these studies.


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