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Simulations of a solid graphite target for high intensity fast extracted uranium beams for the Super-FRS

Published online by Cambridge University Press:  07 July 2008

N.A. Tahir
Affiliation:
Gesellschaft für Schwerionenforschung Darmstadt, Darmstadt, Germany
H. Weick
Affiliation:
Gesellschaft für Schwerionenforschung Darmstadt, Darmstadt, Germany
A. Shutov
Affiliation:
Institute of Problems of Chemical Physics, Chernogolovka, Russia
V. Kim
Affiliation:
Institute of Problems of Chemical Physics, Chernogolovka, Russia
A. Matveichev
Affiliation:
Institute of Problems of Chemical Physics, Chernogolovka, Russia
A. Ostrik
Affiliation:
Institute of Problems of Chemical Physics, Chernogolovka, Russia
V. Sultanov
Affiliation:
Institute of Problems of Chemical Physics, Chernogolovka, Russia
I.V. Lomonosov
Affiliation:
Institute of Problems of Chemical Physics, Chernogolovka, Russia
A.R. Piriz
Affiliation:
E.T.S.I. Industriales, Universidad de Castilla-La Mancha, Ciudad Real, Spain
J.J. Lopez Cela
Affiliation:
E.T.S.I. Industriales, Universidad de Castilla-La Mancha, Ciudad Real, Spain
D.H.H. Hoffmann
Affiliation:
Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany
Corresponding
E-mail address:

Abstract

Extensive numerical simulations have been carried out to design a viable solid graphite wheel shaped production target for the super conducting fragment separator experiments (Super-FRS) at the future Facility for Antiprotons and Ion Research (FAIR) using an intense uranium beam. In this study, generation, propagation and decay of deviatoric stress waves induced by the beam in the target, have been investigated. Maximum beam intensities that the target can tolerate using different focal spot sizes that are determined by requirements of good isotope resolution and transmission of the secondary beam through the fragment separator, have been calculated. It has been reported elsewhere that the tensile strength of graphite significantly increases with temperature. To take advantage of this effect, calculations have also been done in which the target is preheated to a higher temperature, that in practice can be achieved, for example, by irradiating the target with a defocused ion beam before the experiments are performed. We report results of a few examples using an initial temperature of 2000 K. This study has shown that employing such a configuration, one may use a solid graphite production target even for the maximum intensity of the uranium beam (5 × 1011 ion per bunch) at the Super-FRS.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2008

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