Keyword: MEBT
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MOPAB206 The RF Parameters of Heavy Ions Linac cavity, DTL, rfq, linac 679
 
  • A. Sitnikov, G. Kropachev, T. Kulevoy, D.N. Selesnev, A.I. Semennikov
    ITEP, Moscow, Russia
  • M.L. Smetanin, A.V. Telnov, N.V. Zavyalov
    VNIIEF, Sarov, Russia
  
  The new linac for A/Z = 8, out­put en­ergy 4 MeV/u and 3 mA cur­rent is under de­vel­op­ment at NRC "Kur­cha­tov In­sti­tute"-ITEP. The linac con­sists of Ra­dio-Fre­quency Quadru­pole (RFQ) with op­er­at­ing fre­quency 40 MHz and two sec­tions of Drift Tube Linac (DTL) with op­er­at­ing fre­quency 80 and 160 MHz, cor­re­spon­dently. Both DTL has a mod­u­lar struc­ture and con­sists of sep­a­rated in­di­vid­u­ally phased res­onators with fo­cus­ing mag­netic quadrupoles lo­cated be­tween the cav­i­ties. The DTL1 is based on the quar­ter-wave res­onators mean­while DTL2 is based on IH 5-gap res­onators. The 6D beam match­ing be­tween RFQ and DTLs is pro­vided by mag­netic quadru­pole lenses and 2-gaps RF-bunch­ers. The paper pre­sents re­sults of the ra­dio-fre­quency (RF) de­sign of linac ac­cel­er­at­ing struc­tures.  
poster icon Poster MOPAB206 [0.559 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB206  
About • paper received ※ 14 May 2021       paper accepted ※ 01 July 2021       issue date ※ 29 August 2021  
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MOPAB246 Design of the MEBT for the JAEA-ADS Project linac, emittance, rfq, quadrupole 790
 
  • B. Yee-Rendón, Y. Kondo, F.M. Maekawa, S.I. Meigo, J. Tamura
    JAEA/J-PARC, Tokai-mura, Japan
  
  The Medium En­ergy Beam Trans­port (MEBT) will trans­port a CW pro­ton beam with a cur­rent of 20 mA and en­ergy of 2.5 MeV from the exit of the nor­mal con­duct­ing Ra­diofre­quency Quadru­pole (RFQ) to the su­per­con­duct­ing Half-Wave res­onator (HWR) sec­tion. The MEBT must pro­vide a good match­ing be­tween the RFQ and HWR, ef­fec­tive con­trol of the emit­tance growth and the halo for­ma­tion, enough space for all the beam di­ag­nos­tics de­vices, among oth­ers. This work re­ports the first lat­tice de­sign and the beam dy­nam­ics stud­ies for the MEBT of the JAEA-ADS.  
poster icon Poster MOPAB246 [0.827 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB246  
About • paper received ※ 10 May 2021       paper accepted ※ 02 June 2021       issue date ※ 19 August 2021  
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MOPAB356 The ESS MEBT RF Buncher Cavities Conditioning Process cavity, vacuum, controls, EPICS 1107
 
  • I. Bustinduy, N. Garmendia, P.J. González, A. Kaftoosian, S. Masa, I. Mazkiaran, L.C. Medina, J.L. Muñoz
    ESS Bilbao, Zamudio, Spain
  • J. Etxeberria, J.P.S. Martins
    ESS, Lund, Sweden
  
  Funding: This work is part of FEDER-TRACKS project, co-funded by the European Regional Development Fund (ERDF) .
As part of the 5 MW Eu­ro­pean Spal­la­tion Source (ESS), the Medium En­ergy Beam Trans­port (MEBT) was de­signed, as­sem­bled, and in­stalled in the tun­nel since May 2020 by ESS-Bil­bao. This sec­tion of the ac­cel­er­a­tor is lo­cated be­tween the Radio Fre­quency Quadru­pole (RFQ) and the Drift Tube Linac (DTL). The main pur­pose of the MEBT is to match the in­com­ing beam from the RFQ both trans­versely and lon­gi­tu­di­nally into the DTL. The lon­gi­tu­di­nal match­ing is achieved by three 352.209 MHz RF buncher cav­i­ties. In this paper, we focus on the RF con­di­tion­ing process for each set of power cou­pler and buncher cav­ity. For this pur­pose, dif­fer­ent tools were de­vel­oped on EPICS and Python as well as elec­tron­ics hard­ware such as Fast In­ter­lock Mod­ule (FIM) and tim­ing sys­tem. These tools served to au­tom­a­tize both the cav­ity fre­quency tun­ing and the power ramp-up process and will be de­scribed in de­tail in the fol­low­ing sec­tions. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB356  
About • paper received ※ 18 May 2021       paper accepted ※ 09 June 2021       issue date ※ 25 August 2021  
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TUPAB176 ESS Proton Beam Trajectory Correction linac, DTL, simulation, ion-source 1809
 
  • N. Blaskovic Kraljevic, M. Eshraqi, N. Milas, R. Miyamoto
    ESS, Lund, Sweden
  
  The pro­ton linac of the Eu­ro­pean Spal­la­tion Source (ESS) is under con­struc­tion in Lund, Swe­den. Beam tra­jec­tory cor­rec­tion is es­sen­tial to mit­i­gate the ef­fect of ac­cel­er­a­tor el­e­ment mis­align­ment, con­sti­tut­ing the first step to min­imise beam losses. The cor­rec­tion will be per­formed using cor­rec­tors dis­trib­uted along the ac­cel­er­a­tor, based on the beam po­si­tion mon­i­tor (BPM) read­out. Three tra­jec­tory cor­rec­tion tech­niques are con­sid­ered: one-to-one steer­ing, Sin­gu­lar Value De­com­po­si­tion (SVD), and MI­CADO (se­lect­ing a sub­set of cor­rec­tors for the tra­jec­tory cor­rec­tion). The per­for­mance of the three meth­ods is sim­u­lated for the ESS linac and a com­par­i­son of the out­comes is pre­sented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB176  
About • paper received ※ 19 May 2021       paper accepted ※ 15 June 2021       issue date ※ 27 August 2021  
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TUPAB395 Vacuum System Models for Minerva Linac Design vacuum, linac, cavity, rfq 2443
 
  • S. Rey, M.A. Baylac, F. Bouly, E. Froidefond
    LPSC, Grenoble Cedex, France
  • F. Davin, D. Vandeplassche
    SCK•CEN, Mol, Belgium
  • L. Perrot, H. Saugnac
    Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
  
  The goal of the MYRRHA pro­ject is to demon­strate the tech­ni­cal fea­si­bil­ity of trans­mu­ta­tion in a 100 MW Ac­cel­er­a­tor Dri­ven Sys­tem (ADS) by build­ing a new flex­i­ble ir­ra­di­a­tion com­plex at Mol (Bel­gium). The MYRRHA fa­cil­ity re­quires a 600 MeV ac­cel­er­a­tor de­liv­er­ing a max­i­mum pro­ton cur­rent of 4 mA in con­tin­u­ous wave op­er­a­tion, with an ad­di­tional re­quire­ment for ex­cep­tional re­li­a­bil­ity. Sup­ported by SCK•CEN and the Bel­gian fed­eral gov­ern­ment the pro­ject has en­tered in its phase I: this in­cludes the de­vel­op­ment and the con­struc­tion of the linac first part, up to 100 MeV. We here re­view the MIN­ERVA linac vac­uum sys­tem mod­el­ling stud­ies that en­abled to val­i­date the choice of ma­te­ri­als and vac­uum equip­ment. The strengths and weak­nesses of the vac­uum de­sign, high­lighted by the mod­els, will be dis­cussed as well as the re­quired im­prove­ments.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB395  
About • paper received ※ 19 May 2021       paper accepted ※ 01 June 2021       issue date ※ 28 August 2021  
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WEXB05 Beam Commissioning SPIRAL2 linac, proton, rfq, MMI 2540
 
  • A.K. Orduz, M. Di Giacomo, R. Ferdinand, B. Jacquot, O. Kamalou, J.-M. Lagniel, G. Normand, A. Savalle
    GANIL, Caen, France
  • D. Uriot
    CEA-IRFU, Gif-sur-Yvette, France
  
  The SPI­RAL2 in­jec­tor in­cludes a 5 mA pro­ton-deuteron ECR source, a 1 mA ECR heavy ion source (up to A/Q =3) and a CW 0.73 MeV/u RFQ. It has been suc­cess­fully com­mis­sioned using a di­ag­nos­tic-plate in par­al­lel with the su­per­con­duct­ing linac in­stal­la­tion. The green light has been ob­tained for the LINAC com­mis­sion­ing in July of 2019, start­ing with the Medium En­ergy Beam Trans­port (MEBT) com­mis­sion­ing with pro­tons then with he­lium in 2020. The MEBT line and tun­ing process are de­scribed. The main ex­per­i­men­tal re­sults are given, in­clud­ing the emit­tance and pro­file mea­sure­ments which are com­pared with TraceWin sim­u­la­tions. RFQ out­put en­ergy vari­a­tion has been found due to an input en­ergy error, its cor­rec­tion op­ti­miz­ing the source plat­form volt­age is pre­sented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEXB05  
About • paper received ※ 19 May 2021       paper accepted ※ 25 June 2021       issue date ※ 13 August 2021  
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THXA01 Beyond RMS: Understanding the Evolution of Beam Distributions in High Intensity Linacs simulation, rfq, quadrupole, space-charge 3681
 
  • K.J. Ruisard, A.V. Aleksandrov, S.M. Cousineau, A.P. Shishlo, A.P. Zhukov
    ORNL, Oak Ridge, Tennessee, USA
  
  Funding: This work has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy.
Un­der­stand­ing the evo­lu­tion of beams with space charge is cru­cial to de­sign and op­er­a­tion of high in­ten­sity linacs. While the com­mu­nity holds a broad un­der­stand­ing of the mech­a­nisms lead­ing to emit­tance growth and halo for­ma­tion, there is out­stand­ing dis­crep­ancy be­tween mea­sure­ments and beam evo­lu­tion mod­els that pre­cludes pre­dic­tion of halo losses. This may be due in part to in­suf­fi­cient in­for­ma­tion of the ini­tial beam dis­tri­b­u­tion. This talk will de­scribe work at the SNS Beam Test Fa­cil­ity to di­rectly mea­sure the 6D beam dis­tri­b­u­tion. Full-and-di­rect 6D mea­sure­ment has re­vealed hid­den but phys­i­cally sig­nif­i­cant de­pen­dence be­tween the lon­gi­tu­di­nal dis­tri­b­u­tion and trans­verse co­or­di­nates. This non­lin­ear cor­re­la­tion is dri­ven by space charge and re­pro­duced by self-con­sis­tent sim­u­la­tion of the RFQ. Omis­sion of this in­ter­plane cor­re­la­tion, com­mon when bunches are re­con­structed from lower-di­men­sional mea­sure­ments, de­grades down­stream pre­dic­tions. This talk will also de­scribe the novel di­ag­nos­tics sup­port­ing this work. This in­cludes on­go­ing im­prove­ments to ef­fi­ciency of the 6D phase space mea­sure­ment as well as re­cent achieve­ment of six or­ders of dy­namic range in 2D phase space. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THXA01  
About • paper received ※ 20 May 2021       paper accepted ※ 23 July 2021       issue date ※ 17 August 2021  
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THPAB205 On-Line Retuning of ISAC Linac Beam with Quadrupole Scan Tomography quadrupole, ISAC, rfq, diagnostics 4187
 
  • O. Shelbaya, R.A. Baartman, P.M. Jung, O.K. Kester, S. Kiy, T. Planche, Y.-N. Rao, S.D. Rädel
    TRIUMF, Vancouver, Canada
  
  The method of to­mo­graphic re­con­struc­tion has been in use at TRI­UMF and else­where for sev­eral years, al­low­ing for the beam di­ag­nos­tic ex­trac­tion of el­e­ments of the beam ma­trix on-line. One of the more re­cent ap­pli­ca­tions of the tech­nique at ISAC con­sists of using the mea­sured den­sity dis­tri­b­u­tion as the input pa­ra­me­ters for a real-time tune re-com­pu­ta­tion. This tech­nique is ad­van­ta­geous since it does not re­quire in­stal­la­tion of ded­i­cated emit­tance me­ters, but can in­stead be car­ried out with ex­ist­ing po­si­tion mon­i­tors. In­stead of re­quir­ing an op­er­a­tor to man­u­ally re-tune quadrupoles in a match­ing sec­tion, which can be time con­sum­ing, the tech­nique al­lows for a fast and re­pro­ducible means to pre­cisely con­trol the beam and can be pro­ce­du­ral­ized for use by op­er­a­tors tun­ing the ma­chine.  
poster icon Poster THPAB205 [0.468 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB205  
About • paper received ※ 18 May 2021       paper accepted ※ 08 July 2021       issue date ※ 10 August 2021  
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THPAB272 Validation of Two Re-Buncher Cavities under High Beam Loading for LIPAc cavity, LLRF, beam-loading, operation 4343
 
  • D. Gavela, I. Podadera, F. Toral
    CIEMAT, Madrid, Spain
  • I. Moya
    Fusion for Energy, Garching, Germany
  • F. Scantamburlo
    IFMIF/EVEDA, Rokkasho, Japan
  
  Funding: Work partially supported by the Spanish Ministry of Science and Innovation under project AIC-A-2011-0654 and FIS2013-40860-R
Two re-buncher cav­i­ties were in­stalled at the Medium En­ergy Beam Trans­port line of the LIPAc ac­cel­er­a­tor, presently being com­mis­sioned at Rokkasho (Japan). They are IH-type cav­i­ties with five gaps pro­vid­ing an ef­fec­tive volt­age of 350 kV at 175 MHz for a nom­i­nal op­er­a­tion of 125 mA CW deuterons at 5 MeV. After full con­di­tion­ing and beam­line in­te­gra­tion in Eu­rope, the cav­i­ties were in­stalled in the ac­cel­er­a­tor with spe­cial care given to the align­ment with re­spect to the rest of the com­po­nents. The RF line, cool­ing cir­cuits, and in­stru­men­ta­tion were also mounted. The cav­i­ties were op­er­ated with an FPGA-based LLRF sys­tem. A re-con­di­tion­ing of the cav­i­ties was per­formed in the first place, fol­lowed by tests with a pulsed beam with in­creas­ing cur­rents. A max­i­mum pulsed beam cur­rent of 100 mA was reached while op­er­at­ing the buncher cav­i­ties, under which they reached volt­ages up to 340 kV and 260 kV re­spec­tively. As ex­pected, the beam load­ing was sig­nif­i­cant, lead­ing to a se­ries of dif­fi­cul­ties and re­quired strate­gies for a good op­er­a­tion that are dis­cussed in this paper. The ef­fect on the beam dy­nam­ics, mea­sured by beam po­si­tion mon­i­tors down­stream of the bunch­ers is also dis­cussed. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB272  
About • paper received ※ 19 May 2021       paper accepted ※ 02 September 2021       issue date ※ 18 August 2021  
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THPAB319 RF Power Generating System for the Linear Ion Accelerator DTL, rfq, controls, power-supply 4417
 
  • V.G. Kuzmichev, T. Kulevoy, D.A. Liakin, D.N. Selesnev, A. Sitnikov
    ITEP, Moscow, Russia
  • M.L. Smetanin, A.V. Telnov, N.V. Zavyalov
    VNIIEF, Sarov, Russia
  
  An RF power sup­ply sys­tem based on solid-state am­pli­fiers has been de­vel­oped for the lin­ear ac­cel­er­a­tor of heavy ions. The re­port con­tains in­for­ma­tion on the char­ac­ter­is­tics and com­po­si­tion of the sys­tem, pre­sents the LLRF struc­ture for RFQ and DTL sec­tions.  
poster icon Poster THPAB319 [0.275 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB319  
About • paper received ※ 16 May 2021       paper accepted ※ 16 August 2021       issue date ※ 19 August 2021  
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THPAB324 PIP-II 800 MeV Proton Linac Beam Pattern Generator booster, injection, linac, kicker 4426
 
  • H. Maniar, B.E. Chase
    Fermilab, Batavia, Illinois, USA
  • J.E. Dusatko
    SLAC, Menlo Park, California, USA
  • S. Khole
    BARC, Trombay, Mumbai, India
  • D. Sharma
    RRCAT, Indore (M.P.), India
  
  The PIP2 IT Beam Pat­tern Gen­er­a­tor is the sys­tem that syn­chro­nizes beam in­jec­tion and the RF sys­tems be­tween the PIP2 LINAC to the Booster. The RF fre­quen­cies of these two ac­cel­er­a­tor sys­tems are not har­mon­i­cally re­lated. Syn­chro­niza­tion is ac­com­plished by con­trol­ling two MEBT Beam Chop­pers, which se­lect 162.5MHz beam bunches from the LEBT and RFQ to pro­duce an ap­pro­pri­ate re­duced beam bunch pat­tern that en­ables bucket-to-bucket trans­fer to the Booster RF at 46.46MHz (84th har­monic). This chop­ping pat­tern also re­duces the beam cur­rent to an av­er­age of 2mA over the Booster in­jec­tion, match­ing the Linac nom­i­nal beam cur­rent. The BPG also gen­er­ates the RF fre­quency/phase ref­er­ence which the Booster will phase lock to dur­ing in­jec­tion. The BPG is fully pro­gram­ma­ble, al­low­ing for ar­bi­trary beam pat­terns with ad­justable tim­ing pa­ra­me­ters, hav­ing a fine ad­just­ment res­o­lu­tion of 38ps. The lat­ter is ac­com­plished using dig­i­tal sig­nal pro­cess­ing tech­niques. This paper dis­cusses the de­sign of the BPG, its con­struc­tion, test re­sults, and op­er­a­tional ex­pe­ri­ence after being in­te­grated into the PIP2 IT test ac­cel­er­a­tor and con­cludes with a dis­cus­sion of the sys­tem’s per­for­mance and fu­ture plans.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB324  
About • paper received ※ 18 May 2021       paper accepted ※ 01 July 2021       issue date ※ 13 August 2021  
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