Ramp-rate limitation experiments in support of the TPX magnets

Book · Sun Dec 31 04:00:00 EST 1995

OSTI ID:465016

Jeong, S; Schultz, J H; Takayasu, Makoto; Michael, P C ^[1]; Shen, S ^[2]; Vysotsky, V ^[3]; Warnes, W ^[4]

---

1. Massachusetts Inst. of Tech., Cambridge, MA (United States)
2. Lawrence Livermore National Lab., CA (United States)
3. Kurchatov Inst., Moscow (Russian Federation)
4. Oregon State Univ., Eugene, OR (United States)

Fast magnetic field change is required for full-size tokamak reactors. The poloidal field magnets are usually ramped to full field at 1.2 T/s, and see pulsed fields of up to 20 T/s during plasma initiation. A new facility has been constructed at M.I.T. that simulates the expected operating conditions of the Tokamak Physics Experiment (TPX) magnets. New features in this facility include (1) a superconducting pulse coil that can superimpose high ramp-down rates, up to 25 T/s, (2 T in 80 msec) on a background field up to 5 T, (2) new power supplies that can supply high rates of dI/dt and dB/dt to the sample under test and the pulse coil, and (3) a forced-flow supercritical helium system that can simulate cooling conditions within the winding pack. The first sample tested in the facility is a 27-strand sub-cable, using 3.1:1 copper, noncopper ratio Nb{sub 3}Sn superconductor, typical of the strands to be used in ten of the poloidal field system magnets. This paper presents the first experimental results on the ramp rate limitation of the sub-size cable sample of TPX PF coil conductor. The transient stability at high ramp rate fields will be discussed.

• OSTI ID: 465016
• Report Number(s): CONF-950905--; ISBN 0-7803-2969-4
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
EXPERIMENTAL DATA
MAGNETIC FIELDS
PERFORMANCE
POWER SUPPLIES
SUPERCONDUCTING MAGNETS
SUPERCONDUCTORS
TEST FACILITIES
TPX DEVICE