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JINR Flerov Laboratory proposal for the construction of an accelerator and storage ring radioactive ion beam facility.

DERICA project: Dubna Electron-Radioactive Ion Collider fAcility,

Научные задачи перспективного ускорительно-накопительного комплекса для исследования радиоактивных изотопов DERICA, отправлено в редакцию УФН 10.05.2018

Scientific tasks of the prospective acceleration and storage complex DERICA for radioactive isotope research, to be published

Meeting of RAS Council on Heavy Ion Physics, related photos

Working meeting on LINAC-100 and LINAC-30

Working meeting on ring branch

Support of the DERICA project

Contact person: B.Yu. Sharkov (sharkov@itep.ru); technical coordinator: A.S. Fomichev (fomichev@jinr.ru); scientific coordinator: L.V. Grigorenko (lgrigorenko@yandex.ru)

Development of radioactive ion beam (RIB) facilities is the highway of the low-energy nuclear physics development in the world the last 3 decades. The ultimate aim of the RIB studies is to provide full coverage of the nuclear chart for nuclear-stable isotopes and to promote our knowledge to the limits of nuclear structure existence. The information obtained in the RIB studies is indispensable to resolve fundamental problems of nuclear physics (structure, reactions, origins of the nuclear forces) and nuclear astrophysics (nucleosynthesis, properties of the neutron matter).

RIB studies in Russian Federation at the moment are conducted only in one place – ACCULINNA facility at Flerov Laboratory of Nuclear Reactions (FLNR) at the Joint Institute for Nuclear Research (JINR). Much more powerful ACCULINNA-2 facility is now in the commissioning stage, see Figure 1. However, scientific opportunities of these instruments are lower than those expected for the modern RIB center.

Figure 1. ACCULINNA and ACCULINNA-2 fragment separators. DERICA project stage 1. System {gas cell - ion trap - ion source/charge breeder} and accelerator LINAC-30 are mounted in the F6 focal plane of existing ACCULINNA-2 fragment separator making possible R&D for RIB post-acceleration and experiments already in the early stage of the project.

It is proposed to develop powerful RIB facility DERICA (Dubna Electron – Radioactive Ion Collider fAcility) covering broad range of modern nuclear physics aspects (new isotope synthesis and production, its masses, lifetimes and decay modes, nuclear reactions and spectroscopy). However, the emphasis of the project is storage ring physics with ultimate aim of electron-RIB scattering studies in the collider experiments.

DERICA concept combines in-flight production of RIBs by projectile fragmentation technique (primary beams up to uranium, energies ~100 AMeV for A/Z = 6), stopping RI by gas catcher, reacceleration by LINAC-synchrotron combination, usage of reaccelerated RIBs for reaction studies (experimental hall EH-3) and for storage ring experiments (experimental areas of CR ring). The new facility is expected to be built in the JINR territory next to existing FLNR buildings, see Figure 2.

Figure 2. Possible location of the new DERICA facility in the JINR territory next to Flerov laboratory. Arrows indicate the major FLNR objects: U-400 cyclotron (program of superheavy elements synthesis), U-400M cyclotron (light exotic nuclei studies at ACCULINNA and ACCULINNA-2 fragment separators), and “superheavy elements factory” construction site. Location of the stage 1 site is shown in the backyard of the U-400M building.

Development of the facility in four stages since 2018 is proposed with new scientific opportunities arising on each stage:

  • Stage 1. System {gas cell - ion trap - ion source/charge breeder} and accelerator LINAC-30 is mounted in the F6 focal plane of the existing ACCULINNA-2 fragment separator, see Figure 1. Experiments in ion traps and experiments with reaccelerated RIBs up to 30 AMeV.
  • Stage 2. New facility buildings are constructed; “driver” accelerator LINAC-100 (~ 100 AMeV acceleration for A/Z = 6 ions) and fragment separator DFS are installed, see Figure 3. Applied studies (experimental hall EH-1) and reaction studies with intermediate energy (~ 20 – 70 AMeV) RIBs (experimental hall EH-2).
  • Stage 3. System {gas cell - ion trap - ion source/charge breeder} and LINAC-30 are relocated to DERICA building. Together with fast ramping ring synchrotron FRR the reaccelerated RIBs in the range ~ 5 – 300 AMeV are available (experimental hall EH-3).
  • Stage 4. Experiments, including electron-RIB collider studies, can be conducted in three experimental areas of the storage ring CR.
Figure 3. DERICA project, stages 2-4. Color of the beamline corresponds to the stage of the project. Stage 2: applied studies with stable beams 25-100 AMeV (in EH-1) and direct reaction studies with intermediate energy RIBs 20 – 70 AMeV (in EH-2). Stage 3: reaction studies with reaccelerated RIBs (5 – 300 AMeV) in EH-3. Stage 4: storage ring experiments in CR.

Expected construction time ~ 14 years and facility cost ~ 270 M$.