Preliminary study of an integral harmonic analysis magnetic field measurement system for long SSC magnets

摘要

The author describes the research and development required to design and build a prototype system capable of making integrated magnetic multipole measurements of warm and cryogenic 50-mm-bore SSC (Superconducting Super Collider) dipole and quadrupole magnets utilizing a warm probe in a warm finger. The author's experience and some preliminary studies indicate that it is highly unlikely that a 16-m-long probe can be fabricated that will have a twist below several milliradians at any temperature. Consequently, the author describes a segmented 16-m-long probe, for which he intends to calibrate the phase of each segment to within 0.1 mrad. The data for all segments will be acquired simultaneously, and integrated data will be generated from the vector sums of the individual segments. The calibration techniques and instrumentation required to implement this system are described. The duration of an integral measurement at one current is less than 10 s, which is three orders of magnitude shorter than that required by the mole technique presently being used.