Synchrocyclotron for extracting beams of various energies

Abstract

A synchrocyclotron for extracting charged particles accelerated to any extraction energy (Ei) between a low energy (E1) and a high energy (E2) is provided. The synchrocyclotron comprises a magnetic unit comprising N valley sectors and N hill sectors and configured for generating a z-component (Bz) of a main magnetic field. The synchrocyclotron is characterized in that the radial tuning ([nu]r) of successive orbits is not 1 and is in the range of 1 + / - 0.1 for all values of an average radius (R) between a low radius (R1) and a high radius (R2) corresponding to respective average radius positions of charged particles at low and high energies (E1, E2). The synchrocyclotron comprises a first labile coil unit (51) and a second labile coil unit (52) configured for generating a field bump of a radially increasing amplitude ([Delta]Bz(R)) when activated by a power source.

Description

technical field [0001] The invention relates to the extraction of beams of accelerated charged particles at different energies from a synchrocyclotron (SC) comprising mound sectors alternating around a central axis (z) in a symmetrical order (N) of at least three As with valley sectors, these different energies range between low energy (E1) and high energy (E2) corresponding to the low and high mean radii (R1, R2) of the trajectory followed by the beam. In particular, the extraction of this beam is triggered by a magnetic perturbation or field bump whose magnitude can be at a given azimuth angle (θc) (defining the opening of the azimuth sector) and included in The azimuthal sector between the low and high average radii (R1, R2) is controlled to be equal to the offset magnitude (ΔBz0(Ri,νr) at the average instability onset radius (Ri) and radial tuning (νr) θc / 2π), where, [0002] Ri is the average unstable starting radius of the beam to be extracted, where R1 ≤ Ri ≤ R2, corr...

AI Technical Summary

Problems solved by technology

A first disadvantage of iron-based regenerators consists in the fact that the magnitude of the magnetic field bump cannot be easily changed and of course cannot be easily changed during the operation of the cyclotron

This is the main disadvantage when using the same cyclotron to extract particles at different energies

The second disadvantage is that the energy of the extracted particle beam cannot be changed

[0022] The solutions proposed in the latter two papers are interesting, but quite complex and very restrictive for the extraction of charged particles at low energies (approximately 25% to 50% of the nominal energy (Em) of a synchrocyclotron). challenge

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