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<td><img alt="Dissertation Defense Announcement at the Cullen College of Engineering" width="600" height="171" class="x_ContentPasted0" src="https://www.egr.uh.edu/sites/www.egr.uh.edu/files/enews/2022/images/dissertation1.png">
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<div style="font-size:24px; color:rgb(200,16,46); line-height:28px"><strong class="x_ContentPasted0">Reel-to-reel Characterization towards Feedback Control in Manufacturing Long REBCO High-Temperature Superconducting Tapes<br class="x_ContentPasted0">
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<div style="font-size:18px; margin-bottom:5px"><strong class="x_ContentPasted0">Siwei Chen</strong></div>
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December 1, 2022; 9:00 AM - 11:00 AM (CST)<br class="x_ContentPasted0">
Zoom:<span class="x_ContentPasted0"> </span><a href="https://urldefense.com/v3/__https://uh-edu-cougarnet.zoom.us/j/99914353474?pwd=Y0ZlZGk5NzlBTE1PWFM1OEduRDBSZz09__;!!LkSTlj0I!HyMcDBXmyu45p2a9MZT9lYQtIH0AId7b9dQTFB1CN5oa0a5yO9k91iNjCDVBRB6pG7WlfrHWnTOMkEMQV9RBIhgQObg$" data-auth="NotApplicable" class="x_ContentPasted0" style="color:rgb(200,16,46)">https://uh-edu-cougarnet.zoom.us/j/99914353474?pwd=Y0ZlZGk5NzlBTE1PWFM1OEduRDBSZz09</a></p>
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<strong class="x_ContentPasted0">Committee Chair:</strong><br class="x_ContentPasted0">
Venkat Selvamanickam, Ph.D.<br class="x_ContentPasted0">
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<strong class="x_ContentPasted0">Committee Members:</strong><br class="x_ContentPasted0">
Karolas Grigoriadis, Ph.D. | Qianmei (May) Feng, Ph.D. |<br class="x_ContentPasted0">
Zheng Chen, Ph.D. | Marzia Cescon, Ph.D.</p>
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<strong class="x_ContentPasted0">Abstract</strong></p>
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The thriving trend of large-scale, high-magnetic-field superconducting applications increases the demand for high-volume of uniform and high-performance RE-Ba-Cu-O (REBCO, RE=rare earth elements) tapes. This dissertation focuses on off-line and in-line characterization
techniques for assessing the quality of long REBCO tapes.<br class="x_ContentPasted0">
A reel-to-reel magnetization measurement method has been implemented for profiling the off-line critical current density of HTS tapes. A cross-comparison on sensitivities via principle analysis and simulations incorporating various types of magnetization methods
reveals that a combination of self-field remnant field measurement under dipole and quadrupole external magnetic field and in-field screening current field measurement is required to describe the tape performance for high-field applications and to identify
the cracks and weak points.<br class="x_ContentPasted0">
A variety of in-line monitoring techniques have been evaluated for assessment of REBCO tape quality. 2D-X-ray Diffraction (XRD) has been utilized to meet the specifications for reel-to-reel in-line measurement of REBCO tapes during manufacturing. The crystallography
information is extracted from the tapes after necessary corrections and further post-processing of the acquired 2D-XRD diffraction data.<br class="x_ContentPasted0">
Finally, the relationship between off-line and in-line characterization techniques has been investigated. Machine-learning models are trained to predict the self-field and in-field critical current based on the in-line measurement data. Also, a preliminary
investigation of the relationship between process parameters and critical current has been conducted.<br class="x_ContentPasted0">
It is anticipated that a combination of various characterization techniques will serve as a reliable feedback source for real-time quality control in a scaled-up Advanced Metal-Organic Chemical Vapor Deposition process, thereby providing longer and more uniform
high-performance REBCO tapes for large-scale, high-field superconducting applications.</p>
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