A Thermal Analysis Model for High Power Density Beam Stops

Virostek, S.,Oshatz, D., Staples, J.

Particle Accelerator Conference, 2001 PAC 2001 Proceedings of the 2001（2001）

LBNL

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摘要

The Lawrence Berkeley National Laboratory (LBNL) is presently designing and building the 2.5 MeV injector for the Spallation Neutron Source (SNS). The design includes various beam intercepting devices such as beam stops and slits. The target power densities can be as high as 500 kW/cm/sup 2/ with a beam stopping range of 25 to 30 microns, producing stresses well above yield in most materials. In order to analyze the induced temperatures and stresses, a finite element model has been developed. The model has been written parametrically to allow the beam characteristics, target material, dimensions, angle of incidence and mesh densities to be easily adjusted. The heat load is applied to the model through the use of a 3-dimensional table containing the calculated volumetric heat rates. The load is based on a bi-gaussian beam shape which is absorbed by the target according to a Bragg peak distribution. The results of several analyses using the SNS Front End beam are presented.

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关键词

beam handling equipment,finite element analysis,ion optics,neutron sources,nuclear bombardment targets,particle beam diagnostics,particle beam extraction,particle beam injection,proton accelerators,storage rings,thermal stresses,2.5 MeV,25 to 30 micron,Bragg peak distribution,LBNL,Lawrence Berkeley National Laboratory,SNS,SNS frontend beam,Spallation Neutron Source injector,beam characteristics,beam chopper target,beam intercepting devices,biGaussian beam shape,emittance scanner slit,finite element model,heat load,high power density beam stops,incidence angle,mesh densities,pulsed beams,slits,stresses,target material,target power densities,thermal analysis model,volumetric heat rates