| Autor: |
Takashi Kato, D. H. Thompson, M.S. Lubell, D.T. Fehling, J.N. Luton, S.S. Shen, R. E. Stamps, C.T. Wilson, S.W. Schwenterly, J.W. Lue, W.A. Fietz |
| Rok vydání: |
1988 |
| Předmět: |
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| Zdroj: |
A Cryogenic Engineering Conference Publication ISBN: 9781461398769 |
| DOI: |
10.1007/978-1-4613-9874-5_32 |
| Popis: |
The International Fusion Superconducting Magnet Test Facility (IFSMTF) uses six pairs of vapor-cooled leads (VCLs) to introduce electric power to six test coils. Each VCL is housed in a dewar outside the 11-m vacuum vessel and is connected to the coil via a superconducting bus duct; the various VCLs are rated at 12 to 20 kA. Heat loss through the leads constitutes the single largest source of heat load to the cryogenic system. Concerns about voltage breakdown if a coil quenches have led to precautionary measures such as installation of a N2-purged box near the top of the lead and shingles to collect water that condenses on the power buses. A few joints between power buses and VCLs were found to be inadequate during preliminary single-coil tests. This series of tests also pointed to the need for automatic control of helium flow through. the leads. This was achieved by using the resistance measurements of the leads to control flow valves automatically. By the time full-array tests were started, a working scheme had developed that required little attention to the leads and that had little impact on the refrigerator between zero and full current to the coils. The operating loss of the VCLs at full current is averaging at about 7.4 g/s of warm flow and 360 W of cold-gas return load. These results are compared with predictions that were based on earlier tests. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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