Author: Bouly, F.
Paper Title Page
MOPAB191 Method Development for Cavity Failure Compensation in a Superconducting Linac 647
 
  • F. Bouly
    LPSC, Grenoble Cedex, France
  
  Re­li­a­bil­ity is a major chal­lenge within the per­spec­tive of im­prov­ing the per­for­mances and sus­tain­abil­ity of MegaWatt class ac­cel­er­a­tors. To op­ti­mize the op­er­a­tional costs of such ac­cel­er­a­tors the avail­abil­ity re­quire­ments are be­com­ing more and more chal­leng­ing. These re­quire­ments are even more strin­gent in the case of Ac­cel­er­a­tor Dri­ven sys­tems (ADS). As an ex­am­ple, for the MYRRHA (Mul­ti­pur­pose Hy­brid Re­search Re­ac­tor for High-tech Ap­pli­ca­tions) ADS demon­stra­tor, the ac­tual avail­abil­ity limit is set to a max­i­mum of 10 beam in­ter­rup­tions (longer than 3 sec­onds) over a 3-month op­er­at­ing cycle. For this pur­pose, the ac­cel­er­a­tor de­sign is based on a re­dun­dant and fault-tol­er­ant scheme to en­able rapid mit­i­ga­tion of a cav­ity fail­ure. The adopted strat­egy is to apply for local com­pen­sa­tion: a failed cav­ity is com­pen­sated by sev­eral neigh­bor­ing cav­i­ties. Beam dy­nam­ics stud­ies and method de­vel­op­ments to apply such a fail­ure com­pen­sa­tion scheme are here re­viewed. First sim­u­la­tion re­sults for su­per­con­duct­ing linac re­tun­ing and po­ten­tial fu­ture im­prove­ments will be dis­cussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB191  
About • paper received ※ 19 May 2021       paper accepted ※ 21 May 2021       issue date ※ 20 August 2021  
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MOPAB205 Minerva (MYRRHA Phase 1) RFQ Beam Commissioning 675
 
  • A. Gatera, J. Belmans, F. Davin, W. De Cock, F. Doucet, L. Parez, F. Pompon, A. Ponton, D. Vandeplassche
    SCK•CEN, Mol, Belgium
  • F. Bouly
    LPSC, Grenoble Cedex, France
  • C. Joly, L. Perrot
    Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
  • H. Podlech
    IAP, Frankfurt am Main, Germany
  • J. Tamura
    JAEA/J-PARC, Tokai-mura, Japan
  • C. Zhang
    GSI, Darmstadt, Germany
  
  Funding: Part of this work was supported by the European Commission Framework Programme H2020, MYRTE project nr. 662186
The MYRRHA pro­ject aims at cou­pling a 600 MeV pro­ton ac­cel­er­a­tor to a sub­crit­i­cal fis­sion core op­er­at­ing at a ther­mal power of 60 MW. The nom­i­nal pro­ton beam for this ADS has an in­ten­sity of 4 mA and is de­liv­ered in a quasi-CW mode. Phase 1 of the pro­ject will re­al­ize a 100 MeV, 4 mA su­per­con­duct­ing linac with the mis­sion of en­sur­ing the ADS re­quire­ments in terms of re­li­a­bil­ity and fault tol­er­ance. As part of the re­li­a­bil­ity op­ti­miza­tion pro­gram the in­te­grated pro­to­typ­ing of the MIN­ERVA in­jec­tor is on­go­ing. The front-end of the in­jec­tor is com­posed of an ECR pro­ton source, a 2.6 m long LEBT (low en­ergy beam trans­port line) and a four-rod RFQ ac­cel­er­at­ing the beam to 1.5 MeV. The pre­sent con­tri­bu­tion fo­cuses on the cur­rent beam tests on the RFQ, in­clud­ing beam match­ing, RF con­di­tion­ing, as­sess­ment of the cav­i­ties’ per­for­mances and ac­cel­er­ated beam char­ac­ter­i­sa­tion. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB205  
About • paper received ※ 19 May 2021       paper accepted ※ 31 May 2021       issue date ※ 24 August 2021  
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TUPAB361 Study and Design of a Fast Switching Magnet for the MYRRHA Project 2356
 
  • E. Froidefond, F. Bouly, P.-O. Dumont
    LPSC, Grenoble Cedex, France
  • D. Vandeplassche
    SCK•CEN, Mol, Belgium
  
  Funding: Work supported by SCK•CEN, CNRS/IN2P3, Univ. Grenoble Alpes.
The MYRRHA pro­ject aims at build­ing an Ac­cel­er­a­tor Dri­ven Sys­tem demon­stra­tor, which con­sists of two in­jec­tors and a su­per­con­duct­ing linac. The pro­ton beam from the first in­jec­tor ac­cel­er­ated up to 17 MeV goes to the linac (600 MeV) through a Medium En­ergy Beam Trans­fer line (MEBT). Whereas in the mean­time, the beam from the sec­ond in­jec­tor is sent to a beam dump. In case of fail­ure in the first in­jec­tor, the beam of the await­ing in­jec­tor is sent to the linac. A switch­ing mag­net lo­cated at the junc­tion of the two in­jec­tion lines per­forms this beam switch in less than 1.5 sec­onds. A mag­netic de­sign and a me­chan­i­cal struc­ture of this mag­net pro­posed to the MYRRHA pro­ject are pre­sented.
*emmanuel.froidefond@lpsc.in2p3.fr 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB361  
About • paper received ※ 19 May 2021       paper accepted ※ 19 July 2021       issue date ※ 23 August 2021  
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TUPAB395 Vacuum System Models for Minerva Linac Design 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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