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    ACCULLINA-2 - fragment separator of the new generation

  • In March 2017 ACCULINNA-2, basic setup for radioactive ion beam production was put into operation at U400M heavy ion accelerator. The design parameters of this setup were confirmed experimentally. The first beams of radioactive nuclei were produced in 15Ne + Be fragmentation reaction. They are of 25 times higher intensity if compared with ACCULINNA-1 separator which has been in operation in the FLNR since 1996. This project was started in September 2011 in cooperation with SIGMAPHI French company. ACCULINNA-2 separator is a basis for future research of light exotic nuclei in the vicinity of nucleon drip line.


    On April 13,2017 the FLNR Scientific Seminar devoted to this remarkable event was held in the Laboratory under the chairmanship of Academician Yu.Ts.Oganessian, FLNR Scientific Leader. Some members of JINR Directorate took part in the event as well.

    The results of the test experiments were reported by S.A.Krupko. A.S.Fomichev and L.V.Grigorenko presented the new setup first experiments program as well as a plan for further development of the FLNR exotic nuclei experimental facilities for the current and the next seven year periods. State of affairs of U400M accelerator upgrade as ACCULINNA-2 high intensity primary beam source were discussed (G.G.Gulbekian, B.N.Gikal, S.L.Bogomolov)

    Academician V.A.Matveev congratulated the FLNR researchers on the success.

  • In pictures

  • Yu.Ts.Oganessian





  • ACCULINNA-2, in-flight fragment separator belongs to the third generation of the DRIBs facilities. It is to be installed on a primary beam line of the upgraded cyclotron U400M and will be more powerful instrument for production of secondary 6-60 A•MeV RIBs. The new separator is the first stage facility in the process of production of high quality beams of radioactive nuclei with energy of 10-100 keV suitable for applied works in solid-state physics and for injection into an ion trap for mass-spectrometry and/or charge radii measurements. Practical realization of the new DRIBs-3 ISOL facility, i.e., injection of the low energy (10-30 keV) RIBs into the upgraded variable energy cyclotron U400R for the further acceleration up to 5-20 A•MeV is the main goal.

  • Layout of the new fragment separator ACCULINNA-2 in the U-400M cyclotron hall.

  • Characteristics of existing, and new in-flight RIB separators
    (ΔΩ and Δp/p are angular and momentum acceptances, Rp/Δp is the first-order momentum resolution when 1 mm object size is assumed)

    ΔΩ, msr 0.9 / 5.8 5.0 / 8.0 8.0 0.32 / 5.0 1.0
    Δp/p, % ± 2.5 / ± 3.0 ± 3.0 / 6.0 ± 5.5 ± 2.0 / 5.0 ± 5.0
    Rp/Δp 1000 / 2000 1500 / 3300 2915 8600 / 3050 2200
    Bρ, Tm 3.2 / 3.9 5.76 / 9.0 6.0 18 / 18 3.2 - 4.3
    Length, m 21 / 38 27 / 77 35 74 / 140 19(42)
    E, AMeV 10÷40 / 6÷60 50÷90 / 350 110÷160 220÷1000/1500 40÷80

    Additional RIB Filter No / RF-kicker RF-kicker /
    S-form &
    RF- kicker
    S-form / Preseparator Wien Filter

    ACCULINNA-2 will be compatible with RIPS: it’s more extended and operating at low energy domain ERIB ~ 6-60 AMeV with ZRIB = 1-36
    • • inexpensive project / conditions to work with tritium target / experience

  • The scientific program of ACCULINNA-2 fragment separator presupposes the extensive use of the advantages of low energy RIBs (E ~ 6-60 A MeV), cryogenic gaseous targets (including tritium) and modern technique for the study of light exotic nuclei with Z<36.

  • Project status and prospects

  • ACCULINNA-2 construction progress >>>

  • W. Beeckman et al., Status of ACCULINNA-2 RIB Fragment Separator HRS Workshop, GSI, November 2015

  • The possible proposed experiments at ACCULINNA-2 are aimed at the studies of the structure of proton rich nuclei 12O,16,17Ne, 19Mg, 26,27S and extremely neutron rich isotopes like 7H, 10He, 11Li, 16Be,19C.

  • References
    • Fragment separator ACCULINNA-2. Letter of intent, ACCULINNA collaboration. Version: 10.5, May 20, 2010.
      download: [ pdf] (3 854Mb)
    • Long-range plans for research with radioactive ion beams at JINR. A.S. Fomichev, A.A. Bezbakh, V. Chudoba, et al.
      download: [ pdf] (343kb)
    • First experiments at the ACCULINNA-2 fragment separator. A.S. Fomichev
      download: [ pptx] (19 2483Mb)

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