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Title: The Munich Accelerator for Fission Fragments MAFF

Abstract

The layout and status of MAFF at the Munich high flux reactor FRM-II is described. At MAFF 1014 fissions/s will be induced by thermal neutrons in a target with approx. 1 g of 235U. The situation is compared to the SPIRAL2 facility where 1014 fissions/s are expected by fast neutron fission in a target containing 5100 g of 238U. A comparison of the yields of SPIRAL2 and MAFF is performed to show the complementarity of the two ISOL-facilities for fission fragments. MAFF has approximately five times the beam intensities of SPIRAL2 for short-lived fission isotopes with lifetimes shorter than 5 s and thus will focus on the most neutron-rich nuclei, while SPIRAL2 has better perspectives for the more intense, less neutron-rich post-accelerated beams.A problem that also deserves attention is the production of {alpha} emitters, in particular plutonium. Here MAFF has the advantage to contain the Pu-producing 238U only as impurity not as the main fissile system. If SPIRAL2 would use 235U instead of 238U this problematic issue could be avoided at the cost of a further reduction in intensity of very neutron-rich fission fragments by a factor of 10. Finally new physics close to the classically doubly-magic nuclei 78Ni andmore » 132Sn is described.« less

Authors:
; ; ; ; ; ; ; ; ;  [1];  [2]; ; ; ; ;  [3];  [2]; ;  [4]; more »;  [5] « less
  1. LMU Munich, Department f. Physik, Am Coulombwall 1, 85748 Garching (Germany)
  2. (Germany)
  3. TU Munich, Physik-Department E12, 85748 Garching (Germany)
  4. Maier-Leibnitz-Labor f. Kern- und Teilchenphysik, Am Coulombwall 6, 85748 Garching (Germany)
  5. TU Munich, ZWE FRM-II, 85748 Garching (Germany)
Publication Date:
OSTI Identifier:
20719743
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 802; Journal Issue: 1; Conference: ENS'05: International symposium on exotic nuclear systems, Debrecen (Hungary), 20-25 Jun 2005; Other Information: DOI: 10.1063/1.2140620; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ACCELERATORS; FAST NEUTRONS; FISSION; FISSION FRAGMENTS; FRM-II REACTOR; MAGIC NUCLEI; NEUTRON-RICH ISOTOPES; NICKEL 78; PLUTONIUM; RADIOACTIVE ION BEAMS; THERMAL NEUTRONS; TIN 132; URANIUM 235; URANIUM 238

Citation Formats

Habs, D., Gross, M., Assmann, W., Beck, L., Grossmann, R., Maier, H.-J., Schumann, M., Sewtz, M., Szerypo, J., Thirolf, P.G., Maier-Leibnitz-Labor f. Kern- und Teilchenphysik, Am Coulombwall 6, 85748 Garching, Kruecken, R., Faestermann, T., Maier-Komor, P., Nebel, F., Zech, E., Maier-Leibnitz-Labor f. Kern- und Teilchenphysik, Am Coulombwall 6, 85748 Garching, Hartung, P., Stoepler, R., Juettner, Ph., and Tralmer, F.L.. The Munich Accelerator for Fission Fragments MAFF. United States: N. p., 2005. Web. doi:10.1063/1.2140620.
Habs, D., Gross, M., Assmann, W., Beck, L., Grossmann, R., Maier, H.-J., Schumann, M., Sewtz, M., Szerypo, J., Thirolf, P.G., Maier-Leibnitz-Labor f. Kern- und Teilchenphysik, Am Coulombwall 6, 85748 Garching, Kruecken, R., Faestermann, T., Maier-Komor, P., Nebel, F., Zech, E., Maier-Leibnitz-Labor f. Kern- und Teilchenphysik, Am Coulombwall 6, 85748 Garching, Hartung, P., Stoepler, R., Juettner, Ph., & Tralmer, F.L.. The Munich Accelerator for Fission Fragments MAFF. United States. doi:10.1063/1.2140620.
Habs, D., Gross, M., Assmann, W., Beck, L., Grossmann, R., Maier, H.-J., Schumann, M., Sewtz, M., Szerypo, J., Thirolf, P.G., Maier-Leibnitz-Labor f. Kern- und Teilchenphysik, Am Coulombwall 6, 85748 Garching, Kruecken, R., Faestermann, T., Maier-Komor, P., Nebel, F., Zech, E., Maier-Leibnitz-Labor f. Kern- und Teilchenphysik, Am Coulombwall 6, 85748 Garching, Hartung, P., Stoepler, R., Juettner, Ph., and Tralmer, F.L.. Mon . "The Munich Accelerator for Fission Fragments MAFF". United States. doi:10.1063/1.2140620.
@article{osti_20719743,
title = {The Munich Accelerator for Fission Fragments MAFF},
author = {Habs, D. and Gross, M. and Assmann, W. and Beck, L. and Grossmann, R. and Maier, H.-J. and Schumann, M. and Sewtz, M. and Szerypo, J. and Thirolf, P.G. and Maier-Leibnitz-Labor f. Kern- und Teilchenphysik, Am Coulombwall 6, 85748 Garching and Kruecken, R. and Faestermann, T. and Maier-Komor, P. and Nebel, F. and Zech, E. and Maier-Leibnitz-Labor f. Kern- und Teilchenphysik, Am Coulombwall 6, 85748 Garching and Hartung, P. and Stoepler, R. and Juettner, Ph. and Tralmer, F.L.},
abstractNote = {The layout and status of MAFF at the Munich high flux reactor FRM-II is described. At MAFF 1014 fissions/s will be induced by thermal neutrons in a target with approx. 1 g of 235U. The situation is compared to the SPIRAL2 facility where 1014 fissions/s are expected by fast neutron fission in a target containing 5100 g of 238U. A comparison of the yields of SPIRAL2 and MAFF is performed to show the complementarity of the two ISOL-facilities for fission fragments. MAFF has approximately five times the beam intensities of SPIRAL2 for short-lived fission isotopes with lifetimes shorter than 5 s and thus will focus on the most neutron-rich nuclei, while SPIRAL2 has better perspectives for the more intense, less neutron-rich post-accelerated beams.A problem that also deserves attention is the production of {alpha} emitters, in particular plutonium. Here MAFF has the advantage to contain the Pu-producing 238U only as impurity not as the main fissile system. If SPIRAL2 would use 235U instead of 238U this problematic issue could be avoided at the cost of a further reduction in intensity of very neutron-rich fission fragments by a factor of 10. Finally new physics close to the classically doubly-magic nuclei 78Ni and 132Sn is described.},
doi = {10.1063/1.2140620},
journal = {AIP Conference Proceedings},
number = 1,
volume = 802,
place = {United States},
year = {Mon Nov 21 00:00:00 EST 2005},
month = {Mon Nov 21 00:00:00 EST 2005}
}
  • An accelerator (MAFF) for the new Munich high flux reactor FRM-II is under design in order to deliver intense beams of very neutron-rich fission fragments of up to 10{sup 12} particles per second with final energies between 3.7 and 5.9 MeV/u to perform experiments for the production of heavy elements. To obtain an efficient acceleration in a short LINAC, charge breeding of the 1{sup +}-ion beam from the reactor to a q/A{>=}0.16 is required. New measurements with an electron cyclotron resonance ion source (ECRIS) have shown that the requirements for a low duty cycle LINAC (10%) can be fulfilled bymore » the ECRIS. To reach a high flexibility in the final energy with a small number of structures, new kinds of IH-structures are under development at the Munich tandem laboratory.« less
  • At the new Munich high-flux reactor FRM-II, which is currently under construction and will have properties similar to the ILL reactor, a fission fragment accelerator - similar to the former Grenoble PIAFE project - is under design and will be able to provide very intense ion beams of neutron-rich nuclei. A status report of this project is given with emphasis on new developments concerning the in-pile part of the arrangement.
  • A system of computers connected by a local area network (ARCNET) controls the Munich accelerator facility. This includes ion sources, the tandem accelerator, the beam transport system, the gas handling plant, parts of experimental setup and also an ion source test bench. ARCNET is a deterministic multi-master network with arbitrary topology, using coax cables and optical fibers. Crates with single board computers and I/O-boards (analog, parallel or serial digital), dependent on the devices being controlled, are distributed all over the building. Personal computers serve as user interfaces. The LAN communication protocol is a client/server protocol. Communication language and programming languagemore » for the single board computers is Forth. The user mode drivers in the personal computers are also written in Forth. The tools for the operators are MS-Windows applications, programmed in Forth, C++ or Visual Basic. Links to MS-Office applications are available, too.« less
  • The Munich MP tandem accelerator is in operation since 1970. Now it is equipped with a NEC Pelletron charging system and HVEC stainless steel tubes. The negative ion injector and the high energy extension with the analyzing system were completely reconstructed. Also the instrumentation was improved continuously. The tandem is used in an increasing degree not only for nuclear and atomic physics, but also for biological and material science work.