Booster is a standard element in the schemes of the synchrotron facilities of heavy ions. In our case its objectives are as follows

Introduction

• Booster is a standard element in the schemes of the synchrotron facilities of heavy ions. In our case its objectives are as follows.

• 1. Acceleration of the beams to an energy sufficient for the complete stripping of the ions Au32+.

• 2. The accumulation of Au32+ ions in different modes of ion source operation.

• 3. The relief of requirements for vacuum system in Nuclotron.

• 4. The increase of ion phase density in the Booster using electron cooling at the optimum energies close to 100 MeV / nucleon.

• 5. The refusal of the acceleration in collider.

• It should be noted that Nuclotron designed as an accelerator for nuclei up to calcium therefore these features can only be implemented in a synchrotron built for heavy ions like Au32+.

Position

• The iron yoke of the Synchrophasotron after the magnet winding is removed, gives a free tunnel of 4 x 2.3 m2. The present layout of the Nuclotron and existing injection and extraction systems make it possible to place the Booster having 211.2 m circumference and four fold symmetry inside the Synchrophasotron yoke.

Position

Main parameters

Main parameters

• Cycle diagram

Lattice

• FODO lattice

Lattice

• FODO lattice

Superconducting magnets

Injection

• The injection scheme supposes few modes of ion accumulation depending on operation mode of ion sources:

• One turn injection

• Four (three) turn injection

• Twice (triple) repeated one turn injection

• Multi turn injection with coupling resonance and electron cooling

Injection

• Four turn injection

Acceleration

Acceleration

Electron cooling

• The Booster electron cooling system is aimed to form required optimal phase volume of the bunch for their further acceleration in Nuclotron. The maximum designed electron energy is 60 keV.

• Numerical simulations of the cooling process showed that the cooling section of 4 m of the total length and electron current of 1 A provides required ion beam parameters at the ion energy of 100 MeV/u. The parameters are typical for conventional electron cooling systems, the energy corresponds to minimum range of the RF frequency variation (0.6  2.4 MHz) during the Booster working cycle. To adjust the cooling section with the SC magnetic system at minimum length, one plan to use a superconducting solenoid for the electron beam transportation, that is main technical peculiarity of the Booster cooler.

Electron cooling

Extraction

• Fast extraction system consists of kicker magnet and superconducting Lambertson Magnet (steel septum).

• Slow extraction includes 4 quadrupole and 4 sextupole lenses, electrostatic septum and septum magnet. Minimum emittance of extracted beam will be provided by Hardt condition and dynamic bump.