HEPROP - a computer package for the thermophysical properties of helium down to about 2 K

Hands, B.A.

doi:10.1016/0011-2275(73)90079-9

Cited by 17 publications

(3 citation statements)

References 1 publication

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“…The present mathematical model for the re-pressurization process was intended to be a simple onedimensional description of the process, using real fluid properties obtained using HEPAK® [1,2]. From energy conservation, neglecting the kinetic and potential energies and since there is no work performed (either shaft work or a change in the control volume boundary), the change in the total energy of a system can be described by,…”

Section: Model Developmentmentioning

confidence: 99%

Sub-atmospheric re-pressurization analysis of FRIB linac segment 2 cryogenic distribution system

Howard

Knudsen

Hasan

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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The continuous wave heavy ion beam linear accelerator at FRIB consists of 46 cryo-modules, housing 324 superconducting radio-frequency (SRF) resonators and 69 superconducting solenoids. The three linear accelerator (Linac) segments, designated LS1 to LS3, are arranged in the shape of a paper clip, with 4 superconducting dipole magnets in the curved segments. The SRF resonators are operated at 2 K, requiring a sub-atmospheric helium pressure, and the superconducting magnets are operated at 4.5 K. The design of the cryogenic transfer-lines for these Linac segments is complex and contains multiple process lines. Namely, these are the primary (4.5 K) supply, and return, sub-atmospheric return, 35 K shield supply and 55 K shield return. The shield return encloses the other process lines, thermally intercepting the ambient temperature heat load. Testing was conducted on the re-pressurization and liquid levels of the 24 cryo-modules of LS2’s 2 K system. System models were developed and then compared to the test data to characterize the static heat in-leak to the cryo-modules. Reasonable agreement was found between the validated models and preliminary measurements.

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Section: Model Developmentmentioning

confidence: 99%

Sub-atmospheric re-pressurization analysis of FRIB linac segment 2 cryogenic distribution system

Howard

Knudsen

Hasan

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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“…1) and the equation of staie for helium. [4]. The helium flow is described by three one-dimensionaJ pipe-flow-conservation equations:…”

Section: Program Ciccmentioning

confidence: 99%

“…They are each described by an axisymmetric energy equation: The epoxy insulation is not a good conductor, so allowances are made for dividing the insulation thickness into multiple circumferential layers. Equations 1 though 6 and the equation of state [4] are solved simultaneously by the method of lines. The spatial derivatives are approximated by the staggered-grid, finite I t > differencing scheme shown in Fig.…”

Section: Helium Continuity Equation: D\~ DXmentioning

confidence: 99%

Program CICC, flow and heat transfer in cable in conduit conductors

Wong

IEEE Thirteenth Symposium on Fusion Engineering

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Computer program CICC has been written for use in the thermo-fluids design of superconducting magnets for tokamak reactors, which use forced-flow, helium-cooled, cable-in-conduit conductors (CICC). In addition to background heat loads that vary with space and time, these superconductors can develop normal zones that generate electrical resistance heat. Program CICC models the transient thermodynamic and fluid-dynamic system response to background heating and normal-zone propagation in the superconductor. The computational algorithm described in this paper couples a onedimensional, compressible pipe-flow model (including flow choking) with two-dimensional, axisymmetric heatconduction models of the superconductor cable, the conduit, and the epoxy-conduit insulation. National Institute of Standards and Technology helium properties are used. The model is verified by comparison with measured temperature and pressure profiles from thermal expulsion experiments.

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The Construction and Use of Exergy Diagrams

Daly

Harness

1980

Advances in Cryogenic Engineering

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HEPROP - a computer package for the thermophysical properties of helium down to about 2 K

Cited by 17 publications

References 1 publication

Sub-atmospheric re-pressurization analysis of FRIB linac segment 2 cryogenic distribution system

Sub-atmospheric re-pressurization analysis of FRIB linac segment 2 cryogenic distribution system

Program CICC, flow and heat transfer in cable in conduit conductors

The Construction and Use of Exergy Diagrams

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