Unsteady heat dissipation in accelerator superconducting coils insulated with porous ceramic insulation in normal and supercritical helium conditions

Journal Article · Wed Jan 29 00:00:00 EST 2014 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4860757· OSTI ID:22263962

Pietrowicz, S. ^[1]; Four, A.; Baudouy, B. ^[2]; Kimura, N.; Yamamoto, A. ^[3]

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1. Department of Thermodynamics, Institute of Power Engineering and Fluid Mechanics, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50 - 370 Wrocław (Poland)
2. CEA Saclay, Irfu/ SACM, 91191 Gif-sur-Yvette (France)
3. High Energy Accelerator Research Organization, KEK, Tsukuba, Ibaraki 305-0801 (Japan)

To investigate the unsteady heat dissipation in accelerator superconducting coils insulated with porous ceramic insulation, two experimental mock-ups reproducing the thermal and the mechanical conditions of a superconducting coils were produced. The mock-ups with compressive load of 10 MPa and 20 MPa were tested at normal (T = 4.23 K and p = 1 bar) and supercritical helium conditions (T = 4.23 K and p = 2.0 to 3.75 bar) during unsteady heat dissipation. The paper presents the experimental results of temperature rise in both superconducting coils as a function of time for a wide range of a localized heat load varying from 0.1 kJ/m{sup 3} up to 12.8 MJ m{sup −3} per pulse. A numerical model of the transient process in these coils has been developed and the computations are compared with the experimental results.

• OSTI ID: 22263962
• Journal Information: AIP Conference Proceedings, Vol. 1573, Issue 1; Conference: International cryogenic materials conference, Anchorage, AK (United States), 17-21 Jun 2013; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ACCELERATORS
CALCULATION METHODS
CERAMICS
COOLING
HEATING LOAD
HELIUM
POROUS MATERIALS
PULSES
SUPERCONDUCTING COILS
THERMAL DIFFUSIVITY
TIME DEPENDENCE