Modeling of the very low pressure helium flow in the LHC Cryogenic Distribution Line after a quench

Benjamin Bradu 1, 2 Silviu-Iulian Niculescu 1 Philippe Gayet 2 Emmanuel Witrant 3
1 L2S - Laboratoire des signaux et systèmes
2 CERN - European Organization for Nuclear Research
3 GIPSA-SLR - SLR
GIPSA-DA - Département Automatique
Abstract : This paper presents a dynamic model of the helium flow in the Cryogenic Distribution Line (QRL) used in the Large Hadron Collider (LHC) at CERN. The study is focused on the return pumping line, which transports gaseous helium at low pressure and temperature (1.6 kPa / 3 K) over 3.3 km. Our aim is to propose a new real-time model of the QRL while taking into account the non-homogeneous transport phenomena. The flow model is based on 1D Euler equations and considers convection heat transfers, hydrostatic pressure and friction pressure drops. These equations are discretized using a finite difference method based on an upwind scheme. A specific model for the interconnection cells is also proposed. The corresponding simulation results are compared with experimental measurements of a heat wave along the line that results from a quench of a superconducting magnet. Different hypotheses are presented and the influence of specific parameters is discussed.
Keywords : Transmission lines Numerical Simulation Fluid Dynamics Heat transfer Helium Cryogenics
Document type :
Journal articles
Complete list of metadatas

Cited literature [9 references]  Display  Hide  Download
https://hal-supelec.archives-ouvertes.fr/hal-00452782
Contributor : Benjamin Bradu <>
Submitted on : Wednesday, February 3, 2010 - 9:31:53 AM
Last modification on : Thursday, August 22, 2019 - 11:32:03 AM
Long-term archiving on : Friday, June 18, 2010 - 6:34:14 PM

File

Simu_QRL.pdf
Files produced by the author(s)

Identifiers

Collections

GIPSA-SLR | GIPSA | GIPSA-DA | L2S | SUP_SYSTEMES | SUPELEC | SUP_LSS | UGA | UGA-TEST-TER | TDS-MACS

Citation

Benjamin Bradu, Silviu-Iulian Niculescu, Philippe Gayet, Emmanuel Witrant. Modeling of the very low pressure helium flow in the LHC Cryogenic Distribution Line after a quench. Cryogenics, Elsevier, 2010, pp.71-77. ⟨10.1016/j.cryogenics.2009.11.004⟩. ⟨hal-00452782⟩

Export

BibTeX TEI DC DCterms EndNote

Share

Metrics

Record views

840

Files downloads

400

Contact

support.ccsd.cnrs.fr
hal.support@ccsd.cnrs.fr
Logo CCSD