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ACCULINNA started operation in 1996. The first upgrade: ACCULINNA extended into low-background area in 2002. 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 will 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

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


  • Contract with SigmaPhi signed 28.10.2011
  • Status: technical design completed, major parts in production
  • Design and construction reports: XXXX, YYYY
  • Expected commissioning: start of 2015
  • Status of ACCULINNA-2 construction, April 2015
  • W. Beeckman et al., Status of ACCULINNA-2 RIB Fragment Separator HRS Workshop, GSI, November 2015
  • Fragment separator ACCULINNA-2 at U400M. Status and day-one experiments, January 2016
  • Status of ACCULINNA-2 experimental building, March 2016

Program documents

Instrumentation development progress

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