Initial version of ACCULINNA fragment separator started operation in 1996. In 2002 during the upgrade ACCULINNA extended into low-background area. In 2007, after 11 years of successful operation of ACCULINNA, the project of a new in-flight fragment separator ACCULINNA-2 at the U-400M cyclotron in FLNR, JINR is being proposed to upgrade the research done at the existing separator ACCULINNA. The new separator offer high intensity RIBs with Z=1÷36 in the lowest energy range (10–50 MeV/amu) attainable for in-flight separators.


  • Fragment separator ACCULINNA-2, Letter of intent, 2010
  • Creative development of ACCULINNA ideology with a tight budget in mind
  • Compromises and look for “ecological niche”
  • Opportunity to make high-level research is connected with narrow scientific focus and specific design of the planned facility
Lay-out of the fragment-separator ACCULINNA-2. F1 – the object plane; F2 – the intermediate dispersion plane; F3, F4 – the achromatic focal planes; F5 – the final focal plane.

Advantages of ACCULINNA-2

  • New heavily shielded target area with ready for more intense primary beams
  • Higher acceptance with low chromatic aberrations require length
  • Low-energy -> single achromatic stage design
  • Single achromatic stage -> additional velocity filter needed for proton-rich beams: compact RF-kicker is planned
  • Longer beam transport/shaping line for larger ToF and better energy resolution
  • Spacious low-background experimental hall


Program documents

Instrumentation development progress

  • GADAST gamma array development for FRS/ACCULINNA-2
  • Zero angle spectrometer approved by JINR PAC

First experiments on the ACCULINNA-2 fragment-separator