Author: Rabasa, M.
Paper Title Page
WEPPP035 Design and Fluid Dynamics Study of a Recoverable Helium Sample Environment System for Optimal Data Quality in the New Microfocus MX Beamline at the ALBA Synchrotron Light Source 203
 
  • M. Quispe, J.J. Casas, C. Colldelram, D. Garriga, N. González, J. Juanhuix, J. Nicolàs, Y. Nikitin
    ALBA-CELLS, Cerdanyola del Vallès, Spain
  • M. Rabasa
    ESEIAAT, Terrassa, Spain
  
  XAIRA is the new mi­cro­fo­cus MX beam­line under con­struc­tion at the ALBA Syn­chro­tron Light Source. For its ex­per­i­ments, the qual­ity will be op­ti­mized by en­clos­ing all the end sta­tion el­e­ments, in­clud­ing the dif­frac­tome­ter in a he­lium cham­ber, so that the back­ground due to air scat­ter­ing is min­i­mized and the beam is not at­ten­u­ated in the low pho­ton en­ergy range, down to 4 keV. This novel type of cham­ber comes with new chal­lenges from the point of view of sta­bil­ity con­trol and op­er­a­tion in low pres­sure con­di­tions while en­abling the re­cov­ery of the con­sumed he­lium. In par­tic­u­lar, it is planned to col­lect the he­lium gas with a pu­rity > 99.5% and then to re­cover the gas at the ALBA He­lium Liq­ue­fac­tion Plant. Be­sides, the cir­cuit in­cludes a ded­i­cated branch to re­cir­cu­late the he­lium used by the go­niome­ter bear­ing at the dif­frac­tome­ter. This paper de­scribes the fluid dy­namic con­cep­tual de­sign of the He­lium cham­ber and its gas cir­cuit, as well as nu­mer­i­cal re­sults based on one-di­men­sional stud­ies and Com­pu­ta­tional Fluid Dy­nam­ics (CFD).  
poster icon Poster WEPPP035 [1.794 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEPPP035  
About • Received ※ 24 October 2023 — Revised ※ 04 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 18 June 2024
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THPPP016 Numerical and Experimental Studies to Evaluate the Conservative Factor of the Convective Heat Transfer Coefficient Applied to the Design of Components in Particle Accelerators 306
 
  • M. Quispe, J.J. Casas, C. Colldelram, M. Sanchez
    ALBA-CELLS, Cerdanyola del Vallès, Spain
  • H. Bello
    La Romanica, Barberà del Vallès, Sabadell, Spain
  • R. Capdevila, M. Rabasa, G.A. Raush
    ESEIAAT, Terrassa, Spain
  • S. Grozavu
    Universidad Politecnica de Madrid, ETSI Aeronauticos, Madrid, Spain
  
  The fluid bound­ary con­di­tion ap­plied to the de­sign of com­po­nents in Par­ti­cle Ac­cel­er­a­tors is cal­cu­lated as a global vari­able through ex­per­i­men­tal cor­re­la­tions com­ing from the lit­er­a­ture. This vari­able, de­fined as the Con­vec­tive Heat Trans­fer Co­ef­fi­cient, is ob­tained using the cor­re­la­tions of Dit­tus and Boel­ter (1930), Sieder and Tate (1936), Petukhov (1970), Gnielin­ski (1976), among oth­ers. Al­though the de­signs based on these cor­re­la­tions work prop­erly, the hy­poth­e­sis of the pre­sent study pro­poses that the ef­fec­tive­ness of these ap­prox­i­ma­tions is due to the ex­is­tence of a sig­nif­i­cant and un­known con­ser­v­a­tive fac­tor be­tween the real phe­nom­e­non and the global vari­able. To quan­tify this con­ser­v­a­tive fac­tor, this work pre­sents re­search based on Com­pu­ta­tional Fluid Dy­nam­ics (CFD) and ex­per­i­men­tal stud­ies. In par­tic­u­lar, re­cent in­ves­ti­ga­tions car­ried out at ALBA con­firm in a pre­lim­i­nary way our hy­pothe­ses for cir­cu­lar pipes under fully and non-fully de­vel­oped flow con­di­tions. The con­clu­sions of this work in­di­cate that we could dis­si­pate the re­quired heat with a flowrate lower than that ob­tained by ap­ply­ing the ex­per­i­men­tal cor­re­la­tions.  
poster icon Poster THPPP016 [1.419 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP016  
About • Received ※ 24 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 12 March 2024
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)