Measurements of the stability margin of a Nb/sub 3/Sn cable-in-conduit conductor

Conference · Wed Mar 01 04:00:00 EST 1989 · IEEE Trans. Magn.; (United States)

OSTI ID:5917381

Ando, T; Nishi, M; Shimamoto, S

The stability margin of a single quadruplex of Nb/sub 3/Sn/Cu composite strand enclosed in a round stainless-steel tube has been measured by using an inductive heater whose duration time is around 0.1 ms. The strand has a diameter of 1.04 mm and a copper fraction of 69%. The fraction of helium in the cable space is 34.5%. Measurements of the stability margin were carried out by varying transport current, external magnetic field and initial helium pressure. The helium flow rate is always zero. The limiting transport current, which is the boundary value between the upper and the lower stable region similar to NbTi cable-in-conduit conductors were observed. The limiting current density over the cable space inside the conduit at 12 T is 100 A/mm/sup 2/ corresponding to 58% of the critical current. the value does not depend almost on the initial helium pressure in the range of 3 - 12 atm. Observed upper and the lower stability margin were more than 200 mJ/cc strand and less than 60 mJ/cc strand, respectively. The heat transfer coefficient in the cable-in-conduit conductor is estimated to be around 0.1 W/cm/sup 2/K.

• Research Organization: 9699476
• OSTI ID: 5917381
• Report Number(s): CONF-880812-
• Conference Information: Journal Name: IEEE Trans. Magn.; (United States) Journal Volume: 25:2
• Country of Publication: United States
• Language: English

Related Subjects

200303 -- Power Transmission & Distribution-- Superconducting & Cryogenic Systems-- (-1989)
24 POWER TRANSMISSION AND DISTRIBUTION
36 MATERIALS SCIENCE
360104 -- Metals & Alloys-- Physical Properties
420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALLOYS
CABLES
COMPOSITE MATERIALS
CONDUCTOR DEVICES
CRITICAL CURRENT
CURRENT DENSITY
CURRENTS
ELECTRIC CABLES
ELECTRIC CURRENTS
ELECTRICAL EQUIPMENT
ELEMENTS
ENERGY TRANSFER
EQUIPMENT
EVALUATION
FLUIDS
GASES
HEAT TRANSFER
HELIUM
HIGH ALLOY STEELS
IRON ALLOYS
IRON BASE ALLOYS
MAGNETIC FIELDS
MATERIALS
NIOBIUM ALLOYS
NIOBIUM BASE ALLOYS
NONMETALS
RARE GASES
STABILITY
STAINLESS STEELS
STEELS
SUPERCONDUCTING CABLES
SUPERCONDUCTING COMPOSITES
TIN ALLOYS
TITANIUM ALLOYS