M&amp;M: Multi-conductor Mithrandir code for the simulation of thermal-hydraulic transients in superconducting magnets

Savoldi, Laura; Zanino, Roberto

doi:10.1016/s0011-2275(00)00027-8

Cited by 61 publications

(39 citation statements)

References 12 publications

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“…6, can have important effects on the temperature profile established along a given conductor, and a sometimes dominating effect is that of the heat transfer through the joints. The M&M model was thus developed to be able to deal with these effects in real coils [5]. Heat generation in and transfer through the joints were validated against dedicated experiments in the full size joint sample (FSJS) [30] and US prototype (USP) joint sample [12] tests.…”

Section: Mandm Modelmentioning

confidence: 99%

“…In the past, the first set of CSMC T CS measurements was already analysed with the M&M code [5,6], with particular emphasis on the thermal-hydraulic aspects involved in modelling the complex cryogenic circuit of the whole winding. More recently, a simplified thermalhydraulic model was used for a first assessment of possible degradation of performance in the CSMC based on the analysis of voltage-temperature characteristics [7], and M&M was applied to a comparative analysis of the 2000 and 2001 T CS measurements at maximum current (46 kA) [8].…”

Section: Introductionmentioning

confidence: 99%

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Analysis and interpretation of the full set (2000–2002) of TCS tests in conductor 1A of the ITER Central Solenoid Model Coil

Zanino

Mitchell²,

Savoldi

2003

Cryogenics

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The full set of T CS measurements performed during 2000-2002 on conductor 1A of the ITER Central Solenoid Model Coil (CSMC) of the International Thermonuclear Experimental Reactor (ITER) is analysed with the extensively validated M&M code. Under the assumptions of uniform strand properties and uniform current distribution among strands, the performance of this ''average'' strand in the cable is deduced from the best fit of the measured voltage-inlet temperature characteristics. Two fitting parameters are chosen: an ad-hoc additional contribution Ôe extra Õ to the longitudinal strain of the average strand in the cable, and the average-strand (or cable ''effective'') index ÔnÕ of the electric field-current density characteristic. It is shown that the average strand in the CSMC performed less well than expected from the strand database--an increasingly negative e extra being needed to reproduce the coil behaviour at increasing transport currents, and that the cable effective n is clearly below the measured n of the strand. It is argued that this average-strand performance reduction in the CSMC is most likely related to mechanical load effects.

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Section: Mandm Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis and interpretation of the full set (2000–2002) of TCS tests in conductor 1A of the ITER Central Solenoid Model Coil

Zanino

Mitchell²,

Savoldi

2003

Cryogenics

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“…Both inter-turn and inter-layer thermal coupling have been modeled considering the thermal resistance (function of temperature) due to the glass-epoxy insulation (0.6 mm turn insulation and 0.4 mm layer insulation, resulting into 1.2 mm inter-turn and 2.0 mm inter-layer, respectively) [11]. The parametric effect of the contact thermal resistance between adjacent layers of insulation [5] has been investigated.…”

Section: Modelmentioning

confidence: 99%

Modeling of W7-X superconducting coil cool-down using the 4C code

Bonifetto

Kholia

Bertrand

et al. 2011

Fusion Engineering and Design

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The recently developed 4C thermal-hydraulic code is validated here against experimental data from the cooldown of a non-planar coil of the Wendelstein 7-X stellarator from room temperature to the superconducting transition temperature of ~ 10 K, performed during the cold test of the full set of coils at the cryomagnetic test facility of CEA Saclay. The computed results, i.e., temperature and mass flow rate evolutions in different coil components (helium, casing, etc.) are shown to be in good agreement with the experimental data. The simulations also show that during the transient the hot spot temperature inside the coil can be up to ~ 3-4 K higher than what is seen on the casing surface.

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“…-The M&M code [5] can model several CICCs, leaning on the 1D MITHRANDIR code for each conductor and on transverse coupling between conductors.…”

Section: Existing Toolsmentioning

confidence: 99%

Thermo-Hydraulic Analyses Associated With the Design of Jt-60sa Tf Coils Development and Validation of the Tacos∕texto Tool

Lacroix¹,

Portafaix²,

Hertout³

et al. 2010

AIP Conference Proceedings

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In the framework of the JT-60SA project, TF coils design activities have led to the development of TEXTO (Thermo-hydraulic EXtended TOol), a dedicated simulation tool centred on the GANDALF code for calculating the temperature margin (∆Tma) central criterion. From a first version providing conservative results, this tool has been upgraded to a pseudo 3D model by integrating a 1D thermo-hydraulic approach in ANSYS, leading to an additional and independent module named TACOS (Thermo-hydraulic Ansys COmputation Semi 3D).By providing He temperature in conductors, TACOS is well adapted for evaluating the impact of TF coils design choices in the framework of cost and feasibility optimization. TACOS also provides more accurate values of transverse heat flux from case to conductors, which can then be injected into TEXTO and allow the calculation of the temperature margin, thanks to the functionalities of GANDALF.Several validation calculations have been performed for the reference operation scenario, by comparison with GANDALF for validating the simplified thermo-hydraulic method of TACOS and by comparison with VINCENTA for an overall validation of the TACOS/TEXTO tool. Results have shown a good consistency between the different models, with a conductor temperature dispersion around 0.05 K in the critical zone.

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M&M: Multi-conductor Mithrandir code for the simulation of thermal-hydraulic transients in superconducting magnets

Cited by 61 publications

References 12 publications

Analysis and interpretation of the full set (2000–2002) of TCS tests in conductor 1A of the ITER Central Solenoid Model Coil

Analysis and interpretation of the full set (2000–2002) of TCS tests in conductor 1A of the ITER Central Solenoid Model Coil

Modeling of W7-X superconducting coil cool-down using the 4C code

Thermo-Hydraulic Analyses Associated With the Design of Jt-60sa Tf Coils Development and Validation of the Tacos∕texto Tool

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