TPX superconducting tokamak magnet system 1995 design and status overview

Tokamaks in the future will use superconducting cable-in-conduit-conductors (CICC) in all Poloidal Field (PF) & Toroidal Field (TF) magnets. Conventional quench detection, the measurement of small resistive normal-zone voltages (<1 V) in the magnets will be complicated by the presence of large inductive voltages (>4 kV). In the quench detection design for TPX, we have considered several different locations for internal co-wound voltage sensors in the cable cross-section as the primary mechanism to cancel this inductive noise. The Noise Rejection Experiment (NRE) at LLNL has been designed to evaluate which internal locations will produce the best inductive-noise cancellation, and provide us with experimental data for comparison with developed earlier theory. The details of the experiments and resulting data are presented and analyzed.

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TPX magnet helium stub penetration and joining

Sanger

Hillenbrand²,

Swartzback³

et al. 1997

IEEE Trans. Appl. Supercond.

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In support of the TPX magnet project, a program was initiated to develop a technique to attach the helium cooling piping to the cable in conduit conductor. The requirements placed on the technique were high reliability without degrading either the properties of the superconductor or the structural performance of the conductor at the attachment point. The design that evolved consisted of piercing a hole with a roto-broaching tool and TIG welding of the stub to the conductor. The results of the testing that was performed indicated: 1) this joint was leak tight at a sensitivity of lO-"std cdsec, 2) remained so after 5 thermal cycles to 77°K and pressurization to 100 a h , and 3) critical current degradation was limited to two of 1.he 162 strands of the cable. A full description of the design and the testing program is presented in the paper.

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TPX superconducting tokamak magnet system 1995 design and status overview

Cited by 9 publications

References 4 publications

Introduction to Magnet Technology

Introduction to Magnet Technology

Detection of the normal zone with cowound sensors in cable-in conduit conductors

TPX magnet helium stub penetration and joining

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