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3 Nukleonika

3 2003

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Numerical simulation of space charge effects in the sector cyclotron

Onischenko L., Samsonov E., Aleksandrov V., Shevtsov V., Shirkov G., Tuzikov A.

Nukleonika

2003

Vol. 48,suppl.2

45-48

To study the effects of space charge in cyclotrons and synchrocyclotrons the code PHASCOL is developed. A method of large (macro)particles is realized in this code. The complete equations of motion of the charged particle in electromagnetic field of accelerator are integrated taking into account the three-dimensional self-electric field of beam. Two methods were used for the calculation of the beam field: the particle-to-particle method and the particle-in-cell one. The results of calculations which illustrate space-charge effects on the parameters of beam in the process of acceleration are given. Both methods have shown a similar influence of space charge on the beam.

Magnetic system of the heavy ion cyclotron for track membranes production

Alenitsky Y., Zaplatin N., Onischenko L., Samsonov E., Chesnov A.

Nukleonika

2003

Vol. 48,suppl.2

55-57

A heavy ion fixed energy cyclotron based on a conventional magnet with a pole diameter of 1.6 m is designed and constructed in JINR. Ions with A/Z = 5 are accelerated up to the energy E = 2.4 MeV/nucleon. The isochronous magnetic field is formed by four pairs of sector shims. The beam phase shift in formed field is less than š15°RF, and the first harmonic of magnetic field is less than 3 G for all radii of the beam acceleration. Power consumption of magnet is 25 kW. The ECR source with an intensity of 3.5 × 1012 ions/s is used as an ion source. The extracted beam (~1011 ions/s) is intended for the track membrane production.

Computer simulation of the space charge dominated beam dynamics for external injection into the JINR Phasotron

Onischenko L., Samsonov E.

Nukleonika

2003

Vol. 48,suppl.2

29-34

A project of increasing the beam intensity of the 660 MeV JINR proton Phasotron up to 50 žA by an external injection of the H- beam with energy of 5 MeV is now under design. Computer simulation of the space charge dominated beam dynamics in Phasotron is reported. As follows from the simulation, the capture efficiency does not change too much when the beam space charge is taken into account.