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Škoro, G.P.; Back, J. J.; Bennett, J.R.J.; Brooks, S.J.; Densham, C.J.; Edgecock, R.; Loveridge, P. (2009)
Publisher: JACoW
Languages: English
Types: Part of book or chapter of book
Subjects: QC
The UK pro­gramme of high power tar­get de­vel­op­ments for a Neu­tri­no Fac­to­ry is cen­tred on the study of high-Z ma­te­ri­als (tung­sten, tan­ta­lum). A de­scrip­tion of life­time shock tests on can­di­date ma­te­ri­als is given as a part of the re­search into a solid tar­get so­lu­tion. A fast high cur­rent pulse is ap­plied to a thin wire of the sam­ple ma­te­ri­al and the life­time mea­sured from the num­ber of puls­es be­fore fail­ure. These mea­sure­ments are made at tem­per­a­tures up to ~2000 K. The stress on the wire is cal­cu­lat­ed using the LS-DY­NA code and com­pared to the stress ex­pect­ed in the real Neu­tri­no Fac­to­ry tar­get. It has been found that tan­ta­lum is too weak at these tem­per­a­tures but a tung­sten wire has reached over 26 mil­lion puls­es (equiv­a­lent to more than ten years of op­er­a­tion at the Neu­tri­no Fac­to­ry). Mea­sure­ments of the sur­face ve­loc­i­ty of the wire using a laser in­ter­fer­om­e­try sys­tem (VISAR) are in progress, which, com­bined with LS-DY­NA mod­elling, will allow the eval­u­a­tion of the con­sti­tu­tive equa­tions of the ma­te­ri­al. An ac­count is given of the op­ti­mi­sa­tion of sec­ondary pion pro­duc­tion and cap­ture in a Neu­tri­no Fac­to­ry and of the lat­est solid tar­get en­gi­neer­ing ideas.
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    • [7] J. Back, PoS NuFact08:084 (2008); arXiv: 0812.3520.
    • [8] R.Fernow et al., see the web site: http://pubweb.bnl. gov/people/fernow/icool/readme.htm
    • [9] See the ISIS web site: http://www.isis.rl.ac.uk/
    • [10] L.M. Barker, R.E. Hollenbach, J. Appl. Phys., 43(1972)4669.
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