Description
Session 1 - Heat Transfer
Bertrand Baudouy
(CEA Saclay)
12/10/2011, 08:45
Two-phase circulation loop are often used to cool large superconducting magnets since it has the advantage to eliminate the use of pressurization system such as pumps which dissipate power on the fluid and require a costly maintenance and operation at these temperatures. Most of these loops are designed for vertically oriented system to take advantage of the pressure head to create a stable...
Mr
Pier Paolo Granieri
(CERN, Geneva & EPFL Lausanne, Switzerland)
12/10/2011, 09:15
The operation of superconducting magnets with Nb-Ti conductors in helium II allows profiting of superfluidity to efficiently transfer heat from cable to helium bath. In wrapped cable insulations, like the ones used for the main magnets of the Large Hadron Collider particle accelerator, part of heat is transferred through the bulk of the dielectric insulation and part through micro-channels...
Dr
Slawomir Pietrowicz
(CEA)
12/10/2011, 09:45
The High Field Magnet (HFM) project, within the European project EuCARD, aims at constructing an Nb3Sn high field accelerator magnet, Fresca 2, to serve as a test bed for future high field magnets and to upgrade the vertical CERN cable test facility. The Fresca 2 block coil type magnet will be operated at 1.9 K or 4.2 K and is designed to produce about 13.5 T. To study the thermal behavior of...
Ezra van Lanen
(University of Twente)
12/10/2011, 11:00
The paper describes the results from the new thermo-hydraulic model for cable-in-conduit conductor (CICC) joints, which has been specifically developed to analyse the temperature margin of ITER PF coil joints. The heat generation is calculated with the electromagnetic model JackPot-AC, which can calculate the coupling losses in such a CICC joint on a strand-level. Because of this high-level of...
Mr
Enrico Rizzo
(Karlsruhe Institute of Technology)
12/10/2011, 11:30
The Karlsruhe Institute of Technology is responsible for the design, construction and testing of the high temperature superconductor (HTS) current leads (CL) for the stellarator Wendelstein 7-X and for the tokamak JT-60SA. The HTS CL consists basically of an HTS module, carrying the current in the temperature range from 4.5 K to 60 K in series with a Cu bar provided with transverse circular...
Dr
Monika Lewandowska
(Institute of Physics; Faculty of Mechanical Engineering and Mechatronics; West Pomeranian University of Technology, Szczecin, Poland)
12/10/2011, 12:00
The analysis of cooling of a binary HTS 20 kA current lead (CL) operating between 4.5 and 300 K has been carried out. Assuming that the HTS module is conduction cooled, two cooling options for the copper heat exchanger (HEX) part of the CL have been considered, i.e. (1) cooling with a single flow of gaseous helium and (2) cooling with two flows of gaseous helium. The ideal refrigerator power...
Slawomir Pietrowicz
(CEA Saclay)
12/10/2011, 14:00
One of the key issues in the operation of a superconducting particle accelerator is the temperature margin of the magnets exposed to heat losses. The temperature margins of the superconducting magnet coils are mainly determined by the heat transfer through the electrical insulation wrapped around the Rutherford-type cables. We have tested the thermal properties of a mock-up representing an...
