Keyword: closed-orbit
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SUPAG09 Beam Dynamics Simulations of Medical Cyclotrons and Beam Transfer Lines at IBA proton, cyclotron, extraction, electron 104
 
  • J. van de Walle, E. Forton, W.J.G.M. Kleeven, J. Mandrillon, V. Nuttens, E. Van Der Kraaij
    IBA, Louvain-la-Neuve, Belgium
  
  The com­pany Ion Beam Ap­pli­ca­tions (IBA), based in Bel­gium, is spe­cial­ized in the de­sign and fab­ri­ca­tion of cy­clotrons for med­ical ap­pli­ca­tions since more than 30 years. Two main classes of cy­clotrons can be dis­tin­guished : cy­clotrons for ra­dio­pharma pro­duc­tion (3 MeV up to 70 MeV pro­ton beams) and cy­clotrons used in pro­ton ther­apy (230 MeV pro­ton beam). In this con­tri­bu­tion, the de­vel­op­ments of com­pu­ta­tional tools to sim­u­late beam dy­nam­ics in the va­ri­ety of cy­clotrons and as­so­ci­ated beam lines will be de­scribed. The main code for sim­u­lat­ing the cy­clotron beam dy­nam­ics is the ’Ad­vanced Orbit Code’ (AOC) [1]. Ex­am­ples will be shown of beam dy­nam­ics stud­ies in the newly de­signed Cy­clone KIUBE (18 MeV pro­ton cy­clotron for PET iso­tope pro­duc­tion), the Cy­clone230 and the su­per­con­duct­ing syn­chro-cy­clotron (S2C2), both 230 MeV pro­ton cy­clotrons for pro­ton ther­apy. Cal­cu­lated beam emit­tances, res­o­nance cross­ings and beam losses will be shown and their im­pact on the per­for­mance of the ma­chine will be high­lighted. A strong em­pha­sis will be put on the beam prop­er­ties from the S2C2 (pro­ton ther­apy cy­clotron), since un­ex­pected ex­tracted pro­ton beam was dis­cov­ered and ex­plained by de­tailed sim­u­la­tions [2] and the beam prop­er­ties serve as input to sub­se­quent beam line sim­u­la­tion tools. Sev­eral tools have been de­vel­oped to sim­u­late and de­sign trans­fer lines cou­pled to the cy­clotrons. In ra­dio­pharma ap­pli­ca­tions beam losses along the beam­line and the beam size on the pro­duc­tion tar­get are cru­cial, since beam in­ten­si­ties are high and ra­di­a­tion dam­age can be con­sid­er­able. In pro­ton ther­apy, beam in­ten­si­ties are very low but the con­straints on the beam po­si­tion, drift (in po­si­tion, en­ergy and in­ten­sity) and size at the pa­tient level are very tight. In both cases a strong pre­dic­tive power of the cal­cu­lated beam prop­er­ties in the trans­fer lines is needed. The com­pact pro­ton gantry (CGTR) cou­pled with the S2C2 in the Pro­teu­sONE pro­ton ther­apy sys­tem will be shown in de­tail. The CGTR is a s
[1] W. Kleeven et al., IPAC 2016 proceedings, TUPOY002
[2] J. Van de Walle et al., Cyclotrons2016 proceedings, THB01 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ICAP2018-SUPAG09  
About • paper received ※ 19 October 2018       paper accepted ※ 04 December 2018       issue date ※ 26 January 2019  
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TUPAF13 Calculation of the AGS Optics Based on 3D Fields Derived From Experimentally Measured Fields on Median Plane extraction, kicker, focusing, optics 209
 
  • N. Tsoupas, J.S. Berg, S.J. Brooks, F. Méot, V. Ptitsyn, D. Trbojevic
    BNL, Upton, Long Island, New York, USA
  
  Funding: Work supported by the US Department of Energy
Closed orbit cal­cu­la­tions of the AGS syn­chro­tron were per­formed and the beam pa­ra­me­ters at the ex­trac­tion point of the AGS [1] were cal­cu­lated using the RAY­TRACE com­puter code [2] which was mod­i­fied to gen­er­ate 3D fields from the ex­per­i­men­tally mea­sured field maps on the me­dian plane of the AGS com­bined func­tion mag­nets. The al­go­rithm which gen­er­ates 3D fields from field maps on a plane is de­scribed in ref­er­ence [3] which dis­cusses the de­tails of the math­e­mat­i­cal foun­da­tion of this ap­proach. In this pre­sen­ta­tion we will dis­cuss re­sults from stud­ies [1,4] that are based on the 3D fields gen­er­ated from the known field com­po­nents on a rec­tan­gu­lar grid of a plane. A brief overview of the al­go­rithm used will be given, and two meth­ods of cal­cu­lat­ing the re­quired field de­riv­a­tives on the plane will be pre­sented. The cal­cu­lated 3D fields of a mod­i­fied Hal­bach mag­net [5] of inner ra­dius of 4.4 cm will be cal­cu­lated using the two dif­fer­ent meth­ods of cal­cu­lat­ing the field de­riv­a­tives on the plane and the cal­cu­lated fields will be com­pared against the ’ideal’ fields as cal­cu­lated by the OPERA com­puter code [6]. [1] N. Tsoupas et. al. ’Closed orbit cal­cu­la­tions at AGS and Ex­trac­tion Beam Pa­ra­me­ters at H13 AD/RHIC/RD-75 Oct. 1994 [2] S.B. Kowal­ski and H.A. Enge ’The Ion-Op­ti­cal Pro­gram Ray­trace’ NIM A258 (1987) 407 [3] K. Makino, M. Berz, C. John­stone, Int. Jour­nal of Mod­ern Physics A 26 (2011) 1807-1821 [4] N. Tsoupas et. al. ’Ef­fects of Di­pole Mag­net In­ho­mo­gene­ity on the Beam El­lip­soid’ NIM A258 (1987) 421-425 [5] ’The CBETA pro­ject: arXiv.​org > physics > arXiv:1706.04245’’ [6] Vec­tor Fields Inc. https://​operafea.​com/​ 		 
slides icon Slides TUPAF13 [1.772 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ICAP2018-TUPAF13  
About • paper received ※ 20 October 2018       paper accepted ※ 07 December 2018       issue date ※ 26 January 2019  
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