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TY - CONF
AU - Baumgarten, C.
ED - Conradie, Lowry
ED - De Villiers, John Garrett
ED - Schaa, Volker RW
TI - Factors Influencing the Vortex Effect in High-Intensity Cyclotrons
J2 - Proc. of Cyclotrons2019, Cape Town, South Africa, 23-27 September 2019
CY - Cape Town, South Africa
T2 - International Conference on Cyclotrons and their Applications
T3 - 22
LA - english
AB - We discuss factors that have potential influence on the space charge induced vortex motion of particles within high intensity bunches (curling of bunches, Gordon 1969) in isochronous cyclotrons. The influence of the phase slip due to deviations from strict isochronism determines if the bunches of a specific turn are above, below or at "transition", and hence whether stable vortex motion of the bunches is possible at all. Secondly there are possible longitudinal and transverse effects of rf acceleration, the former depending on the bunch phase ("bunching" or "debunching"), the latter depending on the gradient of the accelerating voltage. High accelerating voltages in the first turns call the applicability of adiabatic approximations and analytic methods into question. The influence of the rf acceleration is expected to be significant only at low beam energy, i.e. should have small or even negligible effect beyond the central region of compact machines.
PB - JACoW Publishing
CP - Geneva, Switzerland
SP - 270
EP - 274
KW - cyclotron
KW - bunching
KW - space-charge
KW - acceleration
KW - simulation
DA - 2020/06
PY - 2020
SN - 978-3-95450-205-9
DO - doi:10.18429/JACoW-Cyclotrons2019-WEB03
UR - http://jacow.org/cyclotrons2019/papers/web03.pdf
ER -