Upgrade of U-400 cyclotron

  • The essential upgrade of U400 cyclotron (U-400R after the upgrade) is one of the subprojects of the “U-400R Accelerator Complex” project. The principal goals of the upgrade are:

      – increase in the intensity of accelerated beams for ions with A ≈ 50 from 1.2 pμA to 2.5 pμA;
      – upgrade of a beam extraction system. The upgraded system will provide beam extraction both       with a recharging foil and an electrostatic deflector, which will improve beam quality;
      – smooth variation of the beam energy up to 5 times in a wide range of ion mass-to-charge ratios A/Z, which is important for experiments on the dynamics of fusion-fission reactions, MNT reactions, and experiments on nuclear spectroscopy;
      – decrease of the energy spread of the beam to 3·10-3;
      – decrease of the maximum level of the magnetic field in the center of the cyclotron from 1.9 – 2.1 T to      0.8 – 1.8 T, which will significantly reduce the power consumption of the cyclotron and reduce the level of the scattered magnetic field.

Scheme of the U-400R accelerator

U400
A/Z=5¸12, E=3¸29 MeV/u		U400R
A/Z=4¸12, E=0.8¸27 MeV/u
Comparative characteristics of U-400 and U-400R ion beams
beamE/A(MeV)intensityE/A(MeV)intensityPhysics
6<A<40
7Li
18O
40Ar		 
17
19
5
6×1013
2×1013
9×1012		 
17
19
5
1×1014
1×1014
3×1013		production of light RIB,
fragmentation, transfer,
structure of light exotic
nuclei
A ~ 60
48Ca
54Cr
58Fe
5
5
5
7.5×1012
4×1012
4.4×1012
5
5
5
2×1013
6×1012
6×1012		superheavy elements,
spectroscopy of SHE,
fusion-fission,
quasi-fission, etc.
A ~ 150
124Sn
136Xe
5
5
3×1011
5×1011
5
5
2×1012
3×1012		DIP, multi-nucleon
transfer, new neutron
rich nuclei, shell effects
A ~ 240
 
238U

7

3×1010

7

1011		neutron-rich SHE,
new heavy isotopes,
ternary fission,
super strong electric fields,
e+ e– formation

  • The upgraded U-400R accelerator complex will be employed for fulfilling one of the key tasks, i.e., studying deep inelastic multi-nucleon transfer reactions with heavy ions as a novel method for synthesizing new nuclei, with emphasis on neutron-rich nuclei in the N=126 region and on the region of transuranium nuclei.