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TY - CONF
AU - Zhang, H.J.
AU - Fan, K.
AU - Rao, Y.-N.
AU - Yan, Y.
AU - Zhang, L.G.
ED - Conradie, Lowry
ED - De Villiers, John Garrett
ED - Schaa, Volker RW
TI - Extraction Beam Orbit of a 250 MeV Superconducting Cyclotron
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 - A superconducting cyclotron based on proton therapy facility is being developed at Huazhong university of science and technology (HUST). Due to the compact size of the main magnet, the beam orbits at the extraction region are distributed densely, which creates difficulties for beam extraction leading to severe beam loss. In order to deal with these challenges, the orbit precession method has been employed in the extraction system design. In this paper, we introduce a method of employing a first harmonic field near the nu_{r}=1 resonance where the beam energy is about 248 MeV to adjust the amplitude of beam orbit oscillation. The optimum amplitude and phase of the first harmonic field are designed to obtain a large turn separation in the extraction region. Three different ways of generating the first harmonic field are compared for optimization.
PB - JACoW Publishing
CP - Geneva, Switzerland
SP - 113
EP - 115
KW - extraction
KW - cyclotron
KW - MMI
KW - resonance
KW - proton
DA - 2020/06
PY - 2020
SN - 978-3-95450-205-9
DO - doi:10.18429/JACoW-Cyclotrons2019-MOP035
UR - http://jacow.org/cyclotrons2019/papers/mop035.pdf
ER -