A method for the determination of the radial and axial betatron oscillation amplitudes of the synchrocyclotron beam particles is described. This method has made it possible to find the distribution of particles as a function of the amplitude (an oscillation spectrum). For the Dubna synchrocyclotron the values of radial and axial betatron oscillations at the full radius are 15 cm and 2 cm, respectively.
BS>The capture of particles and their phase shift to a finite radius during the acceleration process must be taken irto consideration when analyzing the characteristics of the phasotron; the frequency and the amplitude of the accelerating voltage needed to accelerate the particles to their ultimate radius must be at their maximum. These characteristics of the phasotron of the Joint Institute for Nuclear Studies were determined during 1961/62. The proton energies were measured as functions of the orbital radius and of the potential field of the duant of the ion source and of the accelerating chamber of the phasotron. On the basis of the results obtained, it was found possible to provide simultaneously optimal conditions for both the capture and the acceleration of the proton beam to its ultimate radius without phase loss. The data indicated that the value of the accelerated proton flux at the ultimate radius was increased from 0.3 to 1.1 to 1.2 mu amp. (TTT)
This article describes the results of research conducted during 1961 and 1962 on tailoring the highfrequency characteristics of the six-meter synchrocyclotron at the Dubna Joint Institute for Nuclear Research. The results obtained enabled us to simultaneously optimize capture conditions and accelerate the proton beam to the ultimate radius with virtually no phase losses. As a result, thecurrent of accelerated protons at the ultimateradins was increased from 0.8 to 1.1–1.2 μ A.
Results are reported of work carried out between the years 1961-62 on the shaping of the r.f. characteristics of the 6-metre synchrocyclotron at the Joint Institute for Nuclear Research. These results have permitted optimum conditions for both capture and acceleration of the protons in the beam to be satisfied simultaneously up to the final radius with virtually no phase losses, as a result of which the current of accelerated protons at the final radius has been increased from 0.3 to 1.1-1.2 μA.