MEDSI2023 - List of Authors (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 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
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

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 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)

Paper

Title

Page

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 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

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

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 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)