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An increasing number of applications require the use of high temperature superconductors (HTS) such as (RE=Rare Earth) Ba2Cu3O7-x (REBCO) coated conductors . HTS conductors show particularly great potential for high field magnets applications due to their high upper critical fields, But several groups have shown that REBCO coated conductors are prone to delamination failure. Under relatively low transverse stress the HTS film separates from the substrate and the conductor degrades . This is problematic due to high transverse stresses that occur in fully epoxy impregnated solenoids wound with this conductor. Application of thin walled heat shrink tubing introduces a weak plane around the conductor, preventing delamination degradation . However, manual application of the shrink tubing is impractical, requiring three operators limited to insulating 100 m lengths or less of REBCO conductor. The high risk of damage to the conductor, also associated with this process, shows the need for a mechanized process. Strict guidelines for the capabilities of the mechanized process were set: a single operator must have the capability to insulate continuous 200 m lengths of REBCO conductor with a minimum insulation rate of 50 m per work day. This thesis presents the ideation, prototyping, and construction of such a mechanized insulation process. Results of prototyping yielded an insulation rate of 100 m per work day with two operators, and the capacity to insulate 130 m of REBCO conductor . Local critical current test indicated that no damage is caused to the tape from the insulation process . A final mechanized Shrink Tube Insulation Apparatus (STIA) was developed, increasing the conductor length capacity to 450 m and reducing the number of operators to one. Due to unforeseen motor and tape tension issues, modifications to STIA were required, which increased the number of operators to two. Through a collaborative effort between the Applied Superconductivity Center (ASC) and the Kyushu University in Japan, a continuous 200 m length of Fujikora produced REBCO conductor was provided, to be insulated by STIA. An insulation rate of 100 m per work day was achieved with two operators. In the latter of the paper, current work to rectify the issues causing the need for two operators is presented.
High field coil insulation, Mechanization, Rebco, Shrink tubing, Superconductivity, YBCO
Date of Defense
July 3, 2014.
A Thesis submitted to the Department of Mechanical Engineering in partial fulfillment of the requirements for the degree of Master of Science.
Includes bibliographical references.
David Larbalestier, Professor Directing Thesis; William Oates, Committee Member; Jonathan Clark, Committee Member; Ulf Trociewitz, Committee Member.
Florida State University
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