Abstract
Conceptual design of a 20-MJ superconducting coil is described which was developed to demonstrate the feasibility of an ohmic-heating system. The superconductor material was Nb3Sn for a 9-T maximum field. Cabled and braided conductors were investigated and the braided conductors were identified as the best alternates because of their high operating current densities and their high porosity [1]. The coil was designed to be cryostable for bipolar operation from a +9 to −9-T maximum field within 1 s. The forced-cooled design described in this paper utilizes crossflow cooling. The coil was designed to generate the flux swing while simultaneously meeting the limitations imposed by cooling, insulation, current density, and stresses in the materials.
Work supported by University of California, Los Alamos Scientific Laboratory, Contract No. L48-8407C-1
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Abbreviations
- A c :
-
= area of conductor
- A cu :
-
= area of copper
- C p :
-
= specific heat at constant pressure
- C v :
-
= specific heat at constant volume
- D w :
-
= diameter wire
- G :
-
= mass velocity
- G o :
-
= superficial mass velocity
- h :
-
= heat transfer coefficient
- j h :
-
= Colburn j-factor
- J :
-
= current density
- k :
-
= thermal conductivity
- L :
-
= length
- M′:
-
= mass helium per unit length of conductor
- ṁ :
-
= mass flow rate
- p :
-
= perimeter, pressure
- Pr:
-
= Prandtl number
- q̇‴ :
-
= heat generated per unit volume
- Re:
-
= Reynolds number
- t,T :
-
= temperature of coolant, metal
- U :
-
= unit thermal surface conductance
- W p :
-
= pump work
- δ :
-
= insulation thickness
- ε :
-
= void fraction
- η th :
-
= thermal efficiency
- ρ :
-
= density
- ρ e :
-
= resistivity
- τ :
-
= time
- ζ :
-
= minimum propagating zone
- c :
-
= critical
- o :
-
= outlet, outside
- s :
-
= surface
References
M. A. Janocko, IEEE Trans. Magn. Mag-15(l):794 (1979).
S. K. Singh, J. H. Murphy, M. A. Janocko, H. E. Haller, H. Riemersma, T. L. Vota, D. C. Litz, R. Gromada, P. W. Eckels, Z. N. Sanjana, and F. N. Domeisen,“Prototype Tokamak Ohmic-Heating 20 MJ Superconducting Coil Study,” Part II—Technical Report, Contract No. L-48–8407C-1 (April 1978).
E. Mullan, D. W. Deis, P. W. Eckels, H. E. Haller III, M. A. Janocko, S. A. Karpathy, D. C. Litz, C. J. Mole, P. Reichner, Z. N. Sanjana, and M. S. Walker, “Design and Fabrication of 300 kJ-Superconducting Energy Storage Coil,” E. M. 5077, Subcontract No. XN4-32767-3 (July 1977).
P. Thullen, J. D. G. Lindsay, D. M. Weldon and H. F. Vogel, “Superconducting Ohmic-Heating Coil Simulation,” presented at Applied Superconductivity Conference, Pittsburgh, Pennsylvania, 1978
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Singh, S.K. et al. (1980). Conceptual Design of a 20-MJ Superconducting Forced-Cooled Ohmic-Heating Coil. In: Timmerhaus, K.D., Snyder, H.A. (eds) Advances in Cryogenic Engineering. Advances in Cryogenic Engineering, vol 35 A. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-9856-1_12
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DOI: https://doi.org/10.1007/978-1-4613-9856-1_12
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