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Title: Ramp-rate sensitivity of SSC dipole magnet prototypes

Abstract

One of the major achievements of the magnet R&D program for the Superconducting Super Collider (SSC) is the fabrication and test of a series of 20 5-cm aperture, 15-m long dipole magnet prototypes. The ramp rate sensitivity of these magnets appears to fall in at least two categories that can be correlated to the manufacturer and production batch of the strands used for the inner-coil cables. The first category, referred to as type-A, is characterized by a strong quench current degradation at high ramp rates, usually accompanied by large distortions of the multipole fields and large energy losses. The second category, referred to as type-B, is characterized by a sudden drop of quench current at low ramp rates, followed by a much milder degradation at larger rates. The multipole fields of the type-B magnets show little ramp-rate sensitivity, and the energy losses are smaller than for the type-A magnets. The behavior of the Type-A magnets can be explained in terms of inter-strand eddy currents arising from low and non-uniform resistances at the crossovers between the strands of the two-layer Rutherford-type cable. Anomalies in the transport-current repartition among the cable strands are suggested as a possible cause for the type-B behavior.more » The origins of these anomalies have not yet been clearly identified. The SSC project was canceled by decision of the United States Congress on October 21, 1994.« less

Authors:
;
Publication Date:
Research Org.:
Superconducting Super Collider Lab., Dallas, TX (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
71687
Report Number(s):
SSCL-Preprint-568
ON: DE95011162; TRN: 95:015259
DOE Contract Number:  
AC35-89ER40486
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Jul 1994
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 66 PHYSICS; SUPERCONDUCTING MAGNETS; PERFORMANCE TESTING; SUPERCONDUCTING SUPER COLLIDER; MAGNETIC DIPOLES; QUENCHING; DESIGN; MAGNETIC FIELDS; ENERGY LOSSES

Citation Formats

Devred, A, and Ogitsu, T. Ramp-rate sensitivity of SSC dipole magnet prototypes. United States: N. p., 1994. Web. doi:10.2172/71687.
Devred, A, & Ogitsu, T. Ramp-rate sensitivity of SSC dipole magnet prototypes. United States. https://doi.org/10.2172/71687
Devred, A, and Ogitsu, T. 1994. "Ramp-rate sensitivity of SSC dipole magnet prototypes". United States. https://doi.org/10.2172/71687. https://www.osti.gov/servlets/purl/71687.
@article{osti_71687,
title = {Ramp-rate sensitivity of SSC dipole magnet prototypes},
author = {Devred, A and Ogitsu, T},
abstractNote = {One of the major achievements of the magnet R&D program for the Superconducting Super Collider (SSC) is the fabrication and test of a series of 20 5-cm aperture, 15-m long dipole magnet prototypes. The ramp rate sensitivity of these magnets appears to fall in at least two categories that can be correlated to the manufacturer and production batch of the strands used for the inner-coil cables. The first category, referred to as type-A, is characterized by a strong quench current degradation at high ramp rates, usually accompanied by large distortions of the multipole fields and large energy losses. The second category, referred to as type-B, is characterized by a sudden drop of quench current at low ramp rates, followed by a much milder degradation at larger rates. The multipole fields of the type-B magnets show little ramp-rate sensitivity, and the energy losses are smaller than for the type-A magnets. The behavior of the Type-A magnets can be explained in terms of inter-strand eddy currents arising from low and non-uniform resistances at the crossovers between the strands of the two-layer Rutherford-type cable. Anomalies in the transport-current repartition among the cable strands are suggested as a possible cause for the type-B behavior. The origins of these anomalies have not yet been clearly identified. The SSC project was canceled by decision of the United States Congress on October 21, 1994.},
doi = {10.2172/71687},
url = {https://www.osti.gov/biblio/71687}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jul 01 00:00:00 EDT 1994},
month = {Fri Jul 01 00:00:00 EDT 1994}
}