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Study of the cyclotron operating conditions; Etude des conditions de fonctionnement du cyclotron

Abstract

This work is a detailed study of the operating conditions of the cyclotron. It analyzes the behaviour of the particles from their first accelerations to their arrival on an external target. Calculations were performed using relativistic formulations in order to make the results usable without any energy level restriction. The obtained results supply some numerical elements for a cyclotron pre-determination and allow a satisfactory visualization of the real phenomena taking place during the accelerations. The shape of the phase change during the successive accelerations has been obtained for a given magnetic field configuration with respect to the operating frequency, to the magnetic field value in the center, and to the accelerating voltage between the dees. Taking into account the limitations due to the accelerating and focussing conditions, the usable phase interval has been determined with respect to the characteristic operating parameters. The study of this phase interval with respect to the accelerating voltage, on the one hand, and with respect to the frequency or to the center magnetic field, on the other hand, has permitted to find again two facts experimentally observed: voltage threshold and dissymmetry of the response curve. The study of radial and axial oscillations has shown the  More>>
Publication Date:
Dec 01, 1948
Product Type:
Technical Report
Report Number:
CEA-004
Resource Relation:
Other Information: 2 refs; PBD: Dec 1948
Subject:
43 PARTICLE ACCELERATORS; ACCELERATION; BEAM DYNAMICS; CYCLOTRONS; DEES; ELECTRIC POTENTIAL; FOCUSING; FREQUENCY DEPENDENCE; ION BEAMS; MAGNETIC FIELD CONFIGURATIONS; OSCILLATIONS; PHASE STABILITY; PRECESSION; TRAJECTORIES
OSTI ID:
20468427
Research Organizations:
Commissariat a l'Energie Atomique, Lab. du Fort de Chatillon, Service Physique Appliquee, 92 - Fontenay-aux-Roses (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR04A0004044137
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
108 pages
Announcement Date:

Citation Formats

Debraine, P, Bariaud, A, and Goldschmidt-Clermont, Y. Study of the cyclotron operating conditions; Etude des conditions de fonctionnement du cyclotron. France: N. p., 1948. Web.
Debraine, P, Bariaud, A, & Goldschmidt-Clermont, Y. Study of the cyclotron operating conditions; Etude des conditions de fonctionnement du cyclotron. France.
Debraine, P, Bariaud, A, and Goldschmidt-Clermont, Y. 1948. "Study of the cyclotron operating conditions; Etude des conditions de fonctionnement du cyclotron." France.
@misc{etde_20468427,
title = {Study of the cyclotron operating conditions; Etude des conditions de fonctionnement du cyclotron}
author = {Debraine, P, Bariaud, A, and Goldschmidt-Clermont, Y}
abstractNote = {This work is a detailed study of the operating conditions of the cyclotron. It analyzes the behaviour of the particles from their first accelerations to their arrival on an external target. Calculations were performed using relativistic formulations in order to make the results usable without any energy level restriction. The obtained results supply some numerical elements for a cyclotron pre-determination and allow a satisfactory visualization of the real phenomena taking place during the accelerations. The shape of the phase change during the successive accelerations has been obtained for a given magnetic field configuration with respect to the operating frequency, to the magnetic field value in the center, and to the accelerating voltage between the dees. Taking into account the limitations due to the accelerating and focussing conditions, the usable phase interval has been determined with respect to the characteristic operating parameters. The study of this phase interval with respect to the accelerating voltage, on the one hand, and with respect to the frequency or to the center magnetic field, on the other hand, has permitted to find again two facts experimentally observed: voltage threshold and dissymmetry of the response curve. The study of radial and axial oscillations has shown the existence of precession phenomena and indicates a maximum limit for the magnetic field variation in order to avoid the disturbances due to oscillations coupling. The study of the ion beam envelope inside the chamber with respect to the initial phases has permitted to determine the optimum shape of the dees and the height of the deflecting channel. Moreover, the influence of various parameters on the ion beam efficiency can be shown using an ideal source. The study of the passing conditions inside the deflecting channel has shown the influence of the separation sheet, has given the dimensions to foresee for the deflecting channel, and has indicated the way to follow to obtain the maximum beam after deflexion (the tuning parameters are not exactly the same after the deflexion and inside the chamber). Finally, an approximate semi-graphical method is described which allows to determine the ions trajectory inside the deflecting channel. (J.S.)}
place = {France}
year = {1948}
month = {Dec}
}