Tuesday - Part II  —  Circular Accelerators  

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TU-07 Operation Status of High Intensity Ion Beams at GANIL 54
 
  • F. Chautard, G. Sénécal
    GANIL, Caen
 
 

The Grand Accéléra­teur Na­tion­al d’Ions Lourds (GANIL) fa­cil­i­ty (Caen, France) is ded­i­cat­ed to the ac­cel­er­a­tion of heavy ion beams for nu­cle­ar physics, atom­ic physics, ra­dio­bi­ol­o­gy and ma­te­ri­al ir­ra­di­a­tion. The pro­duc­tion of sta­ble and ra­dioac­tive ion beams for nu­cle­ar physics stud­ies rep­re­sents the main part of the ac­tiv­i­ty. Two com­ple­men­tary meth­ods are used for ex­ot­ic beam pro­duc­tion: the Iso­tope Sep­a­ra­tion On-Line (ISOL, the SPI­RAL1 fa­cil­i­ty) and the In-Flight Sep­a­ra­tion tech­niques (IFS). SPI­RAL1, the ISOL fa­cil­i­ty, is run­ning since 2001, pro­duc­ing and post-ac­cel­er­at­ing ra­dioac­tive ion beams. The run­ning modes of the ac­cel­er­a­tors are re­called as well as a re­view of the op­er­a­tion from 2001 to 2008. A point is done on the way we man­aged the high in­ten­si­ty ion beam trans­port is­sues and con­straints which al­lows the ex­ot­ic beam pro­duc­tion im­prove­ment.

 

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TU-08 Status Report and Future Development FLNR JINR Heavy Ions Accelerator Complex 59
 
  • G. Gulbekyan, B. Gikal, I. Kalagin, N. Kazarinov
    JINR/FLNR, Dubna
 
 

Four heavy ions cy­clotrons are in op­er­a­tion at FLNR now. Heavy ion beams used for super heavy el­e­ments syn­the­sis, RIB pro­duc­tion and ap­pli­ca­tion. Plan for seven years ac­cel­er­a­tor de­vel­op­ment and op­er­a­tion are pre­sent­ed.

 

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TU-09 RCNP Cyclotron Facility 64
 
  • K. Hatanaka, M. Fukuda, M. Kibayashi, S. Morinobu, K. Nagayama, T. Saito, H. Tamura, T. Yorita
    Osaka University/RCNP, Osaka
 
 

The Re­search Cen­ter for Nu­cle­ar Physics (RCNP) cy­clotron cas­cade sys­tem has been op­er­at­ed to pro­vide high qual­i­ty beams for var­i­ous ex­per­i­ments. In order to in­crease the physics op­por­tu­ni­ties, the Az­imuthal­ly Vary­ing Field (AVF) cy­clotron fa­cil­i­ty was up­grad­ed re­cent­ly. A flat-top­ping sys­tem and an 18-GHz su­per­con­duct­ing Elec­tron Cy­clotron Res­o­nance (ECR) ion source were in­tro­duced to im­prove the beam’s qual­i­ty and in­ten­si­ty. A new beam line was in­stalled to di­ag­nose the char­ac­ter­is­tics of the beam to be in­ject­ed into the ring cy­clotron and to by­pass the ring cy­clotron and di­rect­ly trans­port low en­er­gy beams from the AVF cy­clotron to ex­per­i­men­tal halls. A sep­a­ra­tor is equipped to pro­vide RI beams pro­duced by fu­sion re­ac­tions at low en­er­gy and by pro­jec­tile frag­men­ta­tions at high en­er­gy. De­vel­op­ment has con­tin­ued to re­al­ize the de­signed per­for­mance of these sys­tems.

 

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TU-10 RF Sytem for Heavy Ion Cyclotrons at RIKEN RIBF 69
 
  • N. Sakamoto, M. Fujimaki, A. Goto, O. Kamigaito, M. Kase, R. Koyama, K. Suda, K. Yamada, S. Yokouchi
    RIKEN, Wako
 
 

At RIKEN RIB-fac­to­ry (RIBF) an ac­cel­er­a­tor com­plex as an en­er­gy boost­er which con­sists of su­per­con­duct­ing ring cy­clotron (SRC), in­ter­me­di­ate-stage ring cy­clotron (IRC) and fixed-fre­quen­cy ring cy­clotron (FRC) pro­vides very heavy ion beams like ura­ni­um with an en­er­gy of 345 MeV/u. The total beam power ob­tained up to now at the SRC is as high as 3 kW in the case of 48Ca with an in­ten­si­ty of 170 pnA. Re­cent­ly we have suc­ceed­ed in achiev­ing sta­ble and re­li­able op­er­a­tion of rf sys­tem for new cy­clotrons. In this paper the pre­sent per­for­mance of the rf sys­tem and a re­cent de­vel­op­ment is re­port­ed.

 

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TU-11 A Novel Design of a Cyclotron Based Accelerator System for Multi-Ion Therapy 74
 
  • J.M. Schippers, A. Adelmann, W. Joho, M. Negrazus, M. Seidel, M.K. Stam
    PSI, Villigen
  • H. Homeyer
    HMI, Berlin
 
 

A cy­clotron based sys­tem for hadron ther­a­py is de­vel­oped, which al­lows a phased in­stal­la­tion: start with pro­tons and He­li­um ions and add Car­bon ions later. The con­cept is based on an ac­cel­er­a­tor sys­tem of two cou­pled cy­clotrons. The first cy­clotron pro­vides pro­tons or He ions that can be used for the full spec­trum of treat­ments and “low en­er­gy” C-ions, with a range of 12.7 cm in water for a sub­set of tu­mours and ra­dio­bi­o­log­i­cal ex­per­i­ments. For treat­ments at all tumor sites with C-ions, the C-ions can be boost­ed sub­se­quent­ly up to 450 MeV/nucl in a sep­a­rate sec­tor cy­clotron, con­sist­ing of six sec­tor mag­nets with su­per­con­duct­ing coils and three RF cav­i­ties. First stud­ies of the sep­a­rate sec­tor cy­clotron in­di­cate a rel­a­tive­ly ro­bust de­sign with straight for­ward beam dy­nam­ics. This sys­tem is small­er than cor­re­spond­ing syn­chrotrons and pos­sess­es the typ­i­cal ad­van­tages for ther­a­py ap­pli­ca­tions of a cy­clotron. Pre­sent ef­forts to op­ti­mize the de­sign of the su­per­con­duct­ing sec­tor mag­nets in­di­cate that the in­tro­duc­tion of a ra­di­al gra­di­ent in the sec­tor would have many ad­van­tages.

 

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TU-12 Design Study of Medical Cyclotron SCENT300 79
 
  • M. Maggiore, L. Calabretta, M. Camarda, G. Gallo, S. Passarello, L.A.C. Piazza
    INFN/LNS, Catania
  • D. Campo, D. Garufi, R. La Rosa
    Catania University/Dept. Phys. and Eng., Catania
 
 

The study of the Su­per­con­duct­ing Cy­clotron named SCEN­T300 was car­ried out by the ac­cel­er­a­tor R&D team of Lab­o­ra­tori Nazion­ali del Sud (LNS-INFN) of Cata­nia in col­lab­o­ra­tion with the Uni­ver­si­ty of Cata­nia and sup­port­ed by IBA (Bel­gium). Com­bin­ing the com­pact­ness of a su­per­con­duct­ing cy­clotron, with the ad­van­tage of this kind of ma­chine as its con­tin­u­ous beam and its very good cur­rent con­trol, the ac­cel­er­a­tor R&D group of LNS, by its ten-year of ex­pe­ri­ence with this kind of ma­chine, has de­vel­oped a con­cept for a mul­ti­par­ti­cle ther­a­py cy­clotron which is de­scribed in the fol­low­ing re­port.

 

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TU-13 HIRFL-CSR Commissioning Status and Future Upgrade 84
 
  • Y. Liu, X. Chen, H. Jia, P. Li, L.J. Mao, J.W. Xia, J.C. Yang, X.D. Yang, D.Y. Yin, Y.J. Yuan
    CAS/IMP, Lanzhou
 
 

Funding: Work supported by NSFC project 10635090.


CSR is a new ion cool­er-stor­age-ring sys­tem in IMP, Lanzhou, China, which con­sists of a main ring (CSRm) and an ex­per­i­men­tal ring (CSRe) with two pre­vi­ous cy­clotrons SFC (K=69) and SSC (K=450) as the in­jec­tors. The main con­struc­tion of CSR was com­plet­ed in 2005. It was being com­mis­sioned in the fol­low­ing two years. In 2008 the main pur­pos­es of CSR was fo­cused on the pri­ma­ry 78Kr beam with ki­net­ic en­er­gy up to 500MeV/u for pre­cise mass spec­troscopy at CSRe at isochronous mode. The can­cer ther­a­py phase-II in IMP with 100- 250MeV/u car­bon beam from CSRm was test­ed and 6 pa­tients with tu­mors in the heads were treat­ed suc­cess­ful­ly.

 

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TU-14 Acceleration, Deceleration and Bunching of Stored and Cooled Ion Beams at the TSR, Heidelberg 89
 
  • M. Grieser, R. Bastert, K. Blaum, H. Buhr, R. von Hahn, M.B. Mendes, R. Repnow, A. Wolf
    MPI-K, Heidelberg
 
 

Sev­er­al ex­per­i­ments at the heavy ion stor­age ring TSR have shown the fea­si­bil­i­ty of wide range, ef­fi­cient ac­cel­er­a­tion and de­cel­er­a­tion. The newly de­vel­oped method of mass se­lec­tive ac­cel­er­a­tion en­ables an ef­fec­tive sep­a­ra­tion of ion species with rel­a­tive mass dif­fer­ences of ∆m/m = 3.7 · 10-4. Parabo­la shaped short bunch lengths were mea­sured for an elec­tron cooled 50 MeV 12C6+ ion beam in the space charge limit. To over­come the space charge limit the TSR was op­er­at­ed at a mo­men­tum com­paction of α = 1.57.

 

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TU-15 Status of the Cryogenic Storage Ring  
 
  • R. von Hahn, K. Blaum, J.R. Crespo Lopez-Urrutia, F. Fellenberger, M. Froese, M. Grieser, M. Lange, F. Laux, S. Menk, D. Orlov, R. Repnow, C.D. Schröter, D. Schwalm, T. Sieber, J. Ullrich, A. Wolf
    MPI-K, Heidelberg
  • M.L. Rappaport, D. Zajfman
    Weizmann Institute of Science, Rehovot
  • H. Quack
    TU Dresden, Dresden
  • X. Urbain
    UCL, Louvain-la-Neuve
 
 

A novel next gen­er­a­tion elec­tro­stat­ic Cryo­genic Stor­age Ring (CSR) for heavy ions, molecules and clus­ters up to bio-molecules in the en­er­gy range of 20-300 keV is under con­struc­tion at MPI Hei­del­berg. A unique fea­ture of this ring is the pos­si­bil­i­ty to op­er­ate it at all tem­per­a­tures be­tween room tem­per­a­ture down to 2 K. Op­er­a­tion at cryo­genic tem­per­a­tures is in­evitably nec­es­sary to in­ves­ti­gate the prop­er­ties and re­ac­tion modes of molec­u­lar ions in their ground state as ,e.g., in in­ter­stel­lar en­vi­ron­ment. There­fore only cold wall sur­faces have to be used to elim­i­nate black body ra­di­a­tion ex­cit­ing molec­u­lar quan­tum states. In ad­di­tion, sur­faces of 2-10 K will act as a large cryo-pump, ex­pect­ed to achieve a vac­u­um of bet­ter than 10-15 mbar (cor­re­spond­ing to 10-13 mbar at room tem­per­a­ture), which is manda­to­ry for suf­fi­cient­ly large stor­age times for slow heavy ions. Con­sid­er­able progress to­wards re­al­iza­tion of this tech­no­log­i­cal­ly am­bi­tious pro­ject can be re­port­ed. The de­tailed lay­out of the stor­age ring CSR has been de­fined. A 2 K-21 W he­li­um re­frig­er­a­tor sys­tem was de­signed, or­dered and suc­cess­ful­ly com­mis­sioned at MPI, where it is now in op­er­a­tion to cool the pro­to­type cryo­stat with its cryo­genic ion trap CTF to 2 K tem­per­a­ture.

 

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