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TU-10 RF Sytem for Heavy Ion Cyclotrons at RIKEN RIBF cyclotron, acceleration, ion, pick-up 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 cyclotron, ion, extraction, injection 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 cyclotron, ion, proton, extraction 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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TH-02 Commissioning of the ATLAS Upgrade Cryomodule cryomodule, solenoid, vacuum, ion 151
 
  • P.N. Ostroumov, J.D. Fuerst, S.M. Gerbick, M. Kedzie, M.P. Kelly, S.W.T. MacDonald, R.C. Pardo, S.I. Sharamentov, K. Shepard, G.P. Zinkann
    ANL, Argonne
 
 

Funding: This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357.


The on­go­ing en­er­gy up­grade of the heavy-ion linac ATLAS at ANL in­cludes a new cry­omod­ule con­tain­ing seven 109MHz β=0.15 quar­ter-wave su­per­con­duct­ing cav­i­ties to pro­vide an ad­di­tion­al 15 MV volt­age. Sev­er­al new fea­tures have been in­cor­po­rat­ed into both the cav­i­ty and cry­omod­ule de­sign. For ex­am­ple, the cry­omod­ule sep­a­rates the cav­i­ty vac­u­um space from the in­su­lat­ing vac­u­um, a first for TEM cav­i­ties. The cav­i­ties are de­signed in order to can­cel the beam steer­ing ef­fect due to the RF field. Clean tech­niques have been ap­plied to achieve low-par­tic­u­late rf sur­faces and are es­sen­tial for re­li­able long-term high-gra­di­ent op­er­a­tion. The sealed clean sub­assem­bly con­sist­ing of cav­i­ties, beam spools, beam valves, cou­plers, vac­u­um man­i­fold, and sup­port frame has been at­tached to the top plate of the cry­omod­ule out­side the clean room. Ini­tial com­mis­sion­ing re­sults are pre­sent­ed. The mod­ule was de­signed and built as a pro­to­type for the Fa­cil­i­ty for Rare Iso­tope Beams (FRIB) driv­er linac, how­ev­er, a sim­i­lar de­sign can be ef­fec­tive­ly used in the front-end of SC pro­ton linacs based on TEM-class SC cav­i­ties.

 

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TH-03 Frequency Tuning and RF Systems for the ATLAS Energy Upgrade SC Cavities cryomodule, vacuum, coupling, niobium 156
 
  • G.P. Zinkann, J.D. Fuerst, S.M. Gerbick, M. Kedzie, M.P. Kelly, S.W.T. MacDonald, P.N. Ostroumov, R.C. Pardo, S.I. Sharamentov
    ANL, Argonne
  • K.W. Shepard
    TechSource, Santa Fe
  • Z.A. Conway
    CLASSE, Ithaca
 
 

Funding: This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357.


A new cry­omod­ule with seven low-be­ta su­per­con­duct­ing radio fre­quen­cy (SRF) quar­ter wave nio­bi­um cav­i­ties has been de­signed and con­struct­ed as an en­er­gy up­grade pro­ject for the ATLAS ac­cel­er­a­tor at Ar­gonne Na­tion­al Lab­o­ra­to­ry. The tech­nol­o­gy de­vel­oped for this pro­ject is the basis for the next gen­er­a­tion su­per­con­duct­ing heavy ion ac­cel­er­a­tors. This paper will dis­cuss the meth­ods em­ployed to tune the cav­i­ties eigen­fre­quen­cy to match the ac­cel­er­a­tor mas­ter os­cil­la­tor fre­quen­cy and the de­vel­op­ment of the RF sys­tems used to both drive the cav­i­ty and keep the cav­i­ty phase locked dur­ing op­er­a­tion.

 

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TH-05 HIE-ISOLDE LINAC: Status of the R&D Activities linac, cryomodule, solenoid, vacuum 165
 
  • M. Pasini, S. Calatroni, A. D'Elia, M.A. Fraser, J.C. Gayde, G. Lanza, C. Lasseur, M. Lindroos, R. Maccaferri, C. Maglioni, D. Parchet, P. Trilhe
    CERN, Geneva
 
 

For the post-ac­cel­er­a­tor of ra­dioac­tive ion beams at CERN a major up­grade is planned to take place in the next 4-5 years. The up­grade con­sists in boost­ing the en­er­gy of the ma­chine from 3MeV/u up to 10 MeV/u with beams of mass-to-charge ratio 2.5<A/q<4.5 and in re­plac­ing part of the ex­ist­ing nor­mal con­duct­ing linac. The new ac­cel­er­a­tor is based on two gap in­de­pen­dent­ly phased 101.28 MHz Nb sput­tered su­per­con­duct­ing Quar­ter Wave Res­onators (QWRs). Two cav­i­ty ge­ome­tries, “low” and “high” β, have been se­lect­ed for cov­er­ing the whole en­er­gy range. A R&D pro­gram has start­ed in 2008 look­ing at the dif­fer­ent as­pects of the ma­chine, in par­tic­u­lar beam dy­nam­ics stud­ies, high β cav­i­ty de­vel­op­ment and cry­omod­ule de­sign. A sta­tus re­port of the dif­fer­ent ac­tiv­i­ties is given here.

 

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TH-07 Operational Experience of the Superconducting LINAC Booster at Mumbai linac, controls, cryogenics, acceleration 174
 
  • V. Nanal, R.D. Deshpande, J.N. Karande, S.S. Jangam, P. Dhumal, R.G. Pillay, M.S. Pose, C. Rozario, S.K. Sarkar, S.R. Sinha
    TIFR, Mumbai
  • S.K. Singh, B. Srinivasan
    BARC, Mumbai
 
 

The su­per­con­duct­ing LINAC boost­er, in­dige­nous­ly de­vel­oped to boost the en­er­gy of the heavy ion beams from the 14 MV Pel­letron ac­cel­er­a­tor at TIFR, Mum­bai, has been fully op­er­a­tional since July 2007. The LINAC con­sists of seven mod­u­lar cryostats, each hous­ing four lead plat­ed quar­ter wave res­onators, de­signed for an op­ti­mum ve­loc­i­ty β0=0.1 at an op­er­at­ing fre­quen­cy of 150 MHz. In order to main­tain a sta­ble phase and am­pli­tude of the elec­tric field in the cav­i­ty, the RF con­troller cards based on a self-ex­cit­ed loop (SEL) with phase and am­pli­tude feed­back have been de­vel­oped in­dige­nous­ly. The cryo­genic sys­tem for the LINAC has been de­signed for a typ­i­cal power dis­si­pa­tion of 6 W in each res­onator. Ini­tial beam tri­als have yield­ed av­er­age en­er­gy gain of 0.4 MV/q per cav­i­ty cor­re­spond­ing to 80% of the de­sign value. Op­er­a­tional ex­pe­ri­ence of the LINAC, name­ly, em­pir­i­cal­ly de­vised pro­ce­dures for the ac­cel­er­a­tion of dif­fer­ent beams and RF set­tings, and as­so­ci­at­ed de­vel­op­ments are pre­sent­ed.

 

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FR-03 Improved on line performance of the installed ALPI Nb sputtered QWRs superconductivity, cathode, linac, niobium 203
 
  • A.M. Porcellato, L. Boscagli, F. Chiurlotto, M. De Lazzari, D. Giora, S. Stark, F. Stivanello
    INFN/LNL, Legnaro
 
 

The av­er­age ac­cel­er­at­ing field of the ALPI 160 MHz sput­tered QWRs has been im­prov­ing with time up to reach, after the last con­di­tion­ing cycle, the av­er­age ac­cel­er­at­ing field of 4.8 MV/m @ 7 W. Such value can be ef­fec­tive­ly sus­tained in op­er­a­tion due to the in­trin­sic me­chan­i­cal sta­bil­i­ty of the sput­tered cav­i­ty whose fre­quen­cy is prac­ti­cal­ly not in­flu­enced by fluc­tu­a­tions in the bath He pres­sure. The pre­sent av­er­age cav­i­ty per­for­mance ap­proach­es the max­i­mum av­er­age ac­cel­er­at­ing field ob­tain­able in the present­ly in­stalled cav­i­ties, most of which were pro­duced by re­place­ment of Pb with Nb in the pre­vi­ous­ly in­stalled sub­strates. A high­er av­er­age value can be ob­tained in ALPI re­plac­ing the less per­form­ing units; it is in­stead nec­es­sary to sput­ter on ap­pro­pri­ate­ly built sub­strates to pro­duce QWRs which can re­li­ably ex­ceed 6 MV/m @7W. The cav­i­ty Q-curves, which were re­cent­ly mea­sured in ALPI, show a wide range of Q0 and Q-drop, main­ly as­so­ci­at­ed with the sub­strate char­ac­ter­is­tics, but in some cases also in­flu­enced, as dis­cussed in the paper, by cryo­stat as­sem­bling pro­ce­dures and by cav­i­ty pro­duc­tion and con­di­tion­ing.

 

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FR-04 Operational Experience in PIAVE-ALPI Complex rfq, ion, SRF, ECR 208
 
  • E. Fagotti, G. Bassato, A. Battistella, G. Bisoffi, L. Boscagli, S. Canella, D. Carlucci, M. Cavenago, F. Chiurlotto, M. Comunian, A. Facco, M. De Lazzari, A. Galatà, A. Lombardi, P. Modanese, F. Moisio, A. Pisent, M. Poggi, A.M. Porcellato, P. A. Posocco, C. Roncolato, M. Sattin, F. Scarpa, S. Stark
    INFN/LNL, Legnaro
 
 

PI­AVE-ALPI is the INFN-LNL su­per­con­duct­ing heavy ion linac, com­posed by an SRFQ (su­per­con­duct­ing RFQ) sec­tion and three QWR sec­tions for a total of 80 cav­i­ties in­stalled and an equiv­a­lent volt­age ex­ceed­ing 70 MV. In the last years the SRFQ and the bulk nio­bi­um QWR came into rou­tine op­er­a­tion, the medi­um en­er­gy QWR sec­tion was up­grad­ed with a new Nb sput­tered coat­ing, ECR source was first­ly im­proved by using water cooled plas­ma cham­ber and then re­placed with a new one. The op­er­a­tion of the ac­cel­er­a­tor com­plex al­lowed ac­quir­ing a strong ex­pe­ri­ence on many op­er­a­tional is­sues re­lat­ed to ECRIS, su­per­con­duct­ing cav­i­ties and cryo­gen­ics, beam con­trol and ma­nip­u­la­tion (with the new and high­er ac­cel­er­at­ing gra­di­ent). The paper re­ports about op­er­a­tional ex­pe­ri­ence, the pre­sent lim­i­ta­tions and the fu­ture per­spec­tives of the fa­cil­i­ty in view of the ex­per­i­men­tal cam­paign with the EU de­tec­tor AGATA and of the use of PIAVE ALPI as RIB post-ac­cel­er­a­tor for SPES ra­dioac­tive ion beam fa­cil­i­ty.

 

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A-01 Reference Signal Generation with Direct Digital Synthesis for FAIR antiproton, radio-frequency, synchrotron, ion 218
 
  • M. Bousonville
    GSI, Darmstadt
  • J. Rausch
    TU Darmstadt, Darmstadt
 
 

In this paper, a method for the gen­er­a­tion of RF ref­er­ence sig­nals for syn­chrotrons and stor­age rings will be pre­sent­ed. With these ref­er­ence sig­nals, the RF cav­i­ties in the Fa­cil­i­ty for An­tipro­ton and Ion Re­search (FAIR) shall be syn­chro­nised. Dig­i­tal fre­quen­cy gen­er­a­tors that work ac­cord­ing to the DDS (di­rect dig­i­tal syn­the­sis) prin­ci­ple will be used as ref­er­ence gen­er­a­tors. Via an op­ti­cal net­work with star topol­o­gy, these ref­er­ence gen­er­a­tors will be fed with two clock sig­nals that show a cer­tain cor­re­la­tion of fre­quen­cy and phase. Due to delay mea­sure­ments, their phas­es at dif­fer­ent end points of the op­ti­cal net­work are known. From these clock sig­nals, ref­er­ence sig­nals with spe­cif­ic fre­quen­cies can be de­rived. The phas­es of these ref­er­ence sig­nals can be fine-tuned against the phas­es of the clock sig­nals, al­low­ing the phas­es of dif­fer­ent ref­er­ence sig­nals to be syn­chro­nised. With the com­mer­cial­ly avail­able DDS gen­er­a­tors used in the pro­to­type, phase steps of 0.022° are pos­si­ble. At a ref­er­ence sig­nal fre­quen­cy of 50 MHz, this cor­re­sponds to 1.22 ps. The pre­sen­ta­tion de­scribes the func­tion­al­i­ty of this method for ref­er­ence sig­nal gen­er­a­tion and shows under which con­di­tions the step size of the phase ad­just­ment can be im­proved fur­ther.

 
C-01 Conceptual Design of a Radio Frequency Quadrupole for the Heavy-Ion Medical Facility rfq, simulation, emittance, ion 245
 
  • G. Hahn, D. H. An, H.J. Yim, Y.S. Kim
    KIRAMS, Seoul
 
 

De­sign of con­ven­tion­al 4-vane/rod type of RFQ (Radio Fre­quen­cy Quadrupole) for the heavy ion med­i­cal fa­cil­i­ty has been stud­ied. The RFQ is ca­pa­ble of ac­cel­er­at­ing C4+ ions from an ini­tial en­er­gy of 10 keV/u to 300 keV/u. In this work, all the de­sign pa­ram­e­ters have been op­ti­mized to achieve sta­ble struc­ture and com­pact­ness. The 3D elec­tro­mag­net­ic field dis­tri­bu­tion and RF anal­y­sis were ob­tained by CST Mi­crowave Stu­dio and the field was used in TOU­TATIS for beam sim­u­la­tion. This paper shows the de­ter­mined phys­i­cal and me­chan­i­cal de­sign pa­ram­e­ters of RFQ.

 
C-06 Fabrication of Superconducting Niobium Resonators at IUAC niobium, vacuum, linac, cryomodule 266
 
  • P.N. Potukuchi, D. Kanjilal, K.K. Mistri, A. Rai, A. Roy, S.S.K. Sonti, J. Zacharias
    IUAC, New Delhi
 
 

The fa­cil­i­ty for con­struct­ing su­per­con­duct­ing nio­bi­um res­onators in­dige­nous­ly was com­mis­sioned at the In­ter- Uni­ver­si­ty Ac­cel­er­a­tor Cen­tre in 2002. It was pri­mar­i­ly setup to fab­ri­cate nio­bi­um quar­ter wave res­onators for the su­per­con­duct­ing boost­er linac. Start­ing with a sin­gle quar­ter wave res­onator in the first phase, two com­plete­ly in­dige­nous res­onators were suc­cess­ful­ly built, test­ed and in­stalled in the cry­omod­ules. Sub­se­quent­ly pro­duc­tion of fif­teen more res­onators for the sec­ond and third mod­ules began. Sev­er­al ex­ist­ing res­onators have been suc­cess­ful­ly re­worked and re­stored from a va­ri­ety of prob­lems. In ad­di­tion to build­ing res­onators for the in-house pro­grams, a pro­ject to build two sin­gle spoke res­onators for Pro­ject- X at Fermi Lab, USA has also been taken up. A Tes­la-type sin­gle cell cav­i­ty is also being built in col­lab­o­ra­tion with RRCAT, In­dore. This paper pre­sents de­tails of the fab­ri­ca­tion, test re­sults and fu­ture plans.

 
C-08 Wide Bandwidth, Low Cost System for Cavity Measurements controls, pick-up, superconducting-cavity, superconductivity 274
 
  • S. Stark, A.M. Porcellato
    INFN/LNL, Legnaro
 
 

Re­cent­ly we de­vel­oped a novel mea­sure­ment ap­pa­ra­tus that sim­pli­fy the tests of su­per­con­duct­ing cav­i­ties. A few com­mer­cial elec­tron­ic boards, mount­ed in a de­vot­ed chas­sis and con­trolled by a PC, op­er­ate most of the func­tions usu­al­ly car­ried out by stan­dard RF in­stru­men­ta­tion. The set up al­lows the mea­sure­ments of res­onators in the 80-700 MHz fre­quen­cy range and we used it to char­ac­ter­ize res­onators both in the ALPI vault and in off-line tests. Up­grad­ed con­trol pro­gram car­ries out all the typ­i­cal pro­ce­dures, re­lat­ed to the cav­i­ty mea­sure­ments in clas­si­cal VCO-PLL sys­tem. It al­lows to ad­just and to mea­sure the RF for­ward power, to find and up­date the cav­i­ty res­o­nant fre­quen­cy, to cal­i­brate the pick-up sig­nal, to mon­i­tor the trans­mit­ted power, to ad­just the cou­pler po­si­tion. The im­ple­ment­ed au­to­mat­ic pro­ce­dures per­mit to mea­sure the cav­i­ty decay time, to trace the Q-curve, to per­form CW and pulse RF con­di­tion­ing, to cal­i­brate ca­bles and mea­sure­ment in­stru­ments. The same soft­ware ap­plies to the other two mea­sure­ment sys­tems rou­tine­ly used at Leg­naro to test res­onators up to 6 GHz fre­quen­cy.

 
C-09 Design of the MEBT Rebunchers for the SPIRAL 2 Driver controls, simulation, radio-frequency, resonance 278
 
  • M. Lechartier, D. Besnier, J.F. Leyge, M. Michel
    GANIL, Caen
 
 

The Spi­ral 2 pro­ject uses nor­mal con­duct­ing re­bunch­ers to ac­cel­er­ate high in­ten­si­ty beams of pro­tons, deuterons and heav­ier ions. All cav­i­ties work at 88 MHz, the beta is 0.04 and 3 re­bunch­ers are lo­cat­ed in the MEBT line, which ac­cepts ions with A/q up to 6. The paper de­scribes the RF de­sign and the tech­no­log­i­cal so­lu­tions pro­posed for an orig­i­nal 3-gap cav­i­ty, char­ac­terised by very large beam aper­ture (60 mm) and pro­vid­ing up to 120 kV of ef­fec­tive volt­age.