Abstract
In order to produce a 430 MeV/u carbon ion (12 C 6+) beam for medical therapy, the Korea Institute of Radiological & Medical Sciences (KIRAMS) has carried out the development of a superconducting isochronous cyclotron, the KIRAMS-430. At the extraction of the cyclotron, an Energy Selection System (ESS) is located to modulate the fixed beam energy and to drive the ion beam through High Energy Beam Transport (HEBT) into the treatment room. The beam emittance at the ion beamline is to be measured to provide information on designing a beam with high quality. The well-known quadrupole variation method was used to determine the feasibility of measuring the transverse beam emittance. The beam size measured at the beam profile monitor (BPM) is to be utilized and the transformation of beam by transfer matrix is to be applied being taken under various transport condition of varying quadrupole magnetic strength. Two different methods where beam optics are based on the linear matrix formalism and particle tracking with a 3-D magnetic field distribution obtained by using OPERA3D TOSCA, are applied to transport the beam. The fittings for the transformation parameters are used to estimate the transverse emittance and the twiss parameters at the entrance of the quadrupole in the ESS. Including several systematic studies, we conclude that within the uncertainty the estimated emittances are consistent with the ones calculated by using Monte Carlo simulations.
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References
Joonsun Kang et al., IEEE Trans. on Appl. SuperCond. 70, No. 3 (2012).
G. Hahn, in 2nd International Particles Accelerator Conference, Spain (2011).
Heejoong Yim et al., J. Korean Phys. Soc. 63, 1341 (2013).
B. E. Carlsten, J. C. Goldstein, P. G. O’Shea and E. J. Pitcher, Nucl. Instrum. Meth. Phys. Res. A 331, 791 (1993).
C. Eckman et al., in Proceedings of the 3rd International Particle Accelerator Conference, New Orleans, Louisiana, USA, 2012 (IEEE, Piscataway, NJ, 2012).
E. Chiadroni et al., in Proceedings of the DIPAC 2009, Basel, Switzerland, 2009, pp.402–404.
R. Spesyvtsev et al., in Proceedings of the FEL 2008, Gyeongju, South Korea, 2008.
C. Thomas, N. Delerue and R. Bartolini, JINST 6, P07004 (2011).
J. Liouville, Journ. deMath. 3, 349 (1838).
N. Tongnopparat, L. D. Yu, T. Vilaithong and H. Wiedermann, J. Korean Phys. Soc. 53, 3744 (2008).
G. Penco et. al., in Proceedings of EPAC08, Genoa, Italy, 2008.
K. T. McDonald and D. P. Russell, in Proceedings of the Joint US-CERN School on Obeservation, Diagonosis and Corrections in Particle beams 1988.
F. James and M. Roos, Comput. Phys. Commun. 10, 343 (1975).
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An, D.H., Hahn, G. & Park, C. Transverse beam emittance measurement using quadrupole variation at KIRAMS-430. Journal of the Korean Physical Society 66, 323–329 (2015). https://doi.org/10.3938/jkps.66.323
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DOI: https://doi.org/10.3938/jkps.66.323