Thermal-hydraulic analysis of Tcs measurement in conductor 1A of the ITER Central Solenoid Model Coil using the M&M code
✍ Scribed by L Savoldi; R Zanino
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 563 KB
- Volume
- 40
- Category
- Article
- ISSN
- 0011-2275
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✦ Synopsis
We present a ®rst study of current sharing temperature (T cs ) tests performed over the last few months in the Central Solenoid Model Coil (CSMC) experiment at JAERI, Naka, Japan. The CSMC is a superconducting magnet, layer-wound two-in-hand using 18 layers of Nb 3 Sn two-channel cable-in-conduit conductors, which very recently reached a record 13 T at 46 kA DC operation.
Here we apply the multi-conductor Mithrandir (M&M) code to a selected set of shots with dierent transport currents (30, 40, and 46 kA) and we concentrate on conductor 1A on the innermost (i.e., with highest magnetic ®eld) layer. In the test, resistive heaters located upstream of layers 1 and 2 are used to progressively and quasi-steadily increase the supercritical helium inlet temperature in the coil. The T cs is reached when a threshold of 0.5 mV resistive voltage is measured across the coil, after which the heaters are turned o and the coil current is dumped. Computed results are compared with experimental data, showing good agreement in the inlet and outlet temperatures of all four heated conductors, both as T cs is reached (30, 40 kA) and during the whole hour-long transient from nominal conditions to T cs reached (46 kA).