Author: Longuevergne, D.
Paper Title Page
MOP098 Spoke Cryomodule Prototyping for the MINERVA Project 315
 
  • H. Saugnac, S. Blivet, N. Gandolfo, C. Joly, J. Lesrel, D. Longuevergne, G. Olivier, M. Pierens
    IPN, Orsay, France
  • M.A. Baylac, D. Bondoux, F. Bouly, P.-O. Dumont, Y. Gómez Martínez
    LPSC, Grenoble Cedex, France
  • W. Kaabi
    LAL, Orsay, France
  • W. Sarlin
    IPNO, Orsay, France
 
  In the framework of the MINERVA (MYRRHA 100 MeV) project, a prototyping period started at the end of 2017, has been planned. During this period a prototype cryomodule fully equipped (Spoke Cavities, Cryomodule Vessel, Cold Tuning System, Magnetic shielding, Power Couplers’) as well as its operating and controlling components (LLRF, RF amplifiers’) will be studied and manufactured. The aim of this prototyping period is first to complete the study of all the components and to validate the manufacturing and the assembling procedure in order to freeze the specifications for the serial construction. On the other hand the prototypes will serve as a test stand allowing to study and adjust the "Fault Tolerance" strategy parameters , which is a challenging operating concept specific to the MYRRHA LINAC This poster presents the various tasks related to this Spoke Cryomodule prototyping and their status.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2019-MOP098  
About • paper received ※ 23 June 2019       paper accepted ※ 02 July 2019       issue date ※ 14 August 2019  
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TUP014 Mechanical Design and Fabrication Aspects of Prototype SSR2 Jacketed Cavities 424
 
  • M. Parise, D. Passarelli, F. Ruiu
    Fermilab, Batavia, Illinois, USA
  • P. Duchesne, D. Longuevergne, D. Reynet
    IPN, Orsay, France
 
  A total of 35 Superconducting SSR2 spoke cavities will be installed in the PIP II SRF linac at Fermilab and a total of 8 prototype SSR2 cavities will be manufactured for the prototype cryomodule. In this paper, the mechanical design and fabrication aspects of the prototype jacketed SSR2 cavity will be presented. RF and mechanical design activities were conducted in parallel directly on the jacketed cavity in order to minimize the number of design iterations. Also, the lessons learned from other spoke cavities experiences (i.e. SSR1 at Fermilab and ESS double spoke at IPNO) were considered since the early stage of the design.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2019-TUP014  
About • paper received ※ 23 June 2019       paper accepted ※ 30 June 2019       issue date ※ 14 August 2019  
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TUP019 Status of High Temperature Vacuum Heat Treatment Program at IPN Orsay 438
 
  • M. Fouaidy, F. Chatelet, V. Delpech, F. Galet, D. Le Dréan, D. Longuevergne, R. Martret, G. Olry, T. Pépin-Donat
    IPN, Orsay, France
  • M. Baudrier, P. Carbonnier, E. Fayette, X. Hanus, Th. Proslier, D. Roudier, P. Sahuquet, C. Servouin
    CEA-DRF-IRFU, France
  • E. Cenni, L. Maurice
    CEA-IRFU, Gif-sur-Yvette, France
 
  In the framework of ESS, a vacuum furnace dedicated to High Temperature Heat Treatment under Vacuum (VH2T2) of SRF bulk Nb cavities was developed and commissioned in May 2016. This furnace is currently used for interstitial hydrogen removal (10h00 @ 650 °C) of two type of cavities: 1) the whole series of 26 ESS 352 MHz spoke resonators equipped with their Ti LHe tank well, 2) some prototypes of ESS high beta and medium beta cavities. Up to know IPN Orsay VH2T2 (10h00 @ 650 °C) was successfully applied to more than 16 cavities. In this paper we will first report about these VH2T2 tests. Finally, we have just started testing nitrogen infusion and nitrogen doping processes on samples and 1.3 GHz cavities: the preliminary results will be discussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2019-TUP019  
About • paper received ※ 03 July 2019       paper accepted ※ 04 July 2019       issue date ※ 14 August 2019  
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TUP054 How Is Flux Expulsion Affected by Geometry: Experimental Evidence and Model 555
 
  • D. Longuevergne
    IPN, Orsay, France
 
  Measurements of magnetic sensitivity to trapped flux on several type of cavity geometries have been performed at IPNO showing a clear geometrical effect. Magnetic sensitivity depends not only on material quality but also on the cavity geometry and on the residual magnetic field orientation. A presentation of experimental data will be done. These will be as well compared to the theoretical magnetic sensitivities calculated thanks to a simple Labview routine  
poster icon Poster TUP054 [1.312 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2019-TUP054  
About • paper received ※ 03 July 2019       paper accepted ※ 04 July 2019       issue date ※ 14 August 2019  
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THP002 Metallographic Polishing Pathway to the Future of Large Scale SRF Facilities 828
SUSP011   use link to see paper's listing under its alternate paper code  
 
  • O. Hryhorenko, M. Chabot, D. Longuevergne
    IPN, Orsay, France
  • C.Z. Antoine
    CEA-IRFU, Gif-sur-Yvette, France
 
  Funding: The financial support from the European Nuclear Science and Applications Research 2 (ENSAR 2) under grant agreeement N°654002.
Optimization of SRF cavities mainly focuses on pushing the limits of bulk Niobium, cost reduction of cavity fabrication and development of new SRF materials for future accelerators (ILC, FCC). Nowadays chemical etching is the only surface treatment used to prepare SRF surface made of Nb. However the operational cost of chemical facilities is high and these present a very bad ecological footprint. The search of an alternative technique could make the construction of these future large scale facilities possible. Metallographic polishing (MP) is a candidate not only for bulk Nb treatment, but could also provide the mirror-finished substrate for alternative SRF thin films deposition. Recent R&D studies, conducted at IPNO & IRFU, focused on the development of 2-steps MP procedure of Nb flat samples. Roughness of polished surface has been proven better than standard EP treatment and less polluted than CBP. MP provides on flat surfaces a high removal rate (above 1 µm/min) and high reproducibility. The paper will describe the optimized method and present all the surface analysis performed. The first RF characterization of a polished disk will be presented.
 
poster icon Poster THP002 [2.902 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2019-THP002  
About • paper received ※ 20 June 2019       paper accepted ※ 30 June 2019       issue date ※ 14 August 2019  
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