자료유형  

 학위논문

Control Number  

0017164632

International Standard Book Number  

9798346857204

Dewey Decimal Classification Number  

620.11

Main Entry-Personal Name  

Viklund, Eric.

Publication, Distribution, etc. (Imprint  

[S.l.] : Northwestern University., 2024

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2024

Physical Description  

112 p.

General Note  

Source: Dissertations Abstracts International, Volume: 86-06, Section: B.

General Note  

Advisor: Seidman, David N.

Dissertation Note  

Thesis (Ph.D.)--Northwestern University, 2024.

Summary, Etc.  

요약Superconducting radiofrequency cavities are an essential component in modern particle accelerators for transferring RF power to the particle beam. SRF cavity performance is determined by the first 10 nm to 100 nm of the superconducting material. Therefore, it is essential to study this region. One parameter of the surface morphology that is particularly important is surface roughness. Surface roughness is theorized to have a large impact on cavity performance due to magnetic field enhancement and superheating field suppression. In this thesis, two types of SRF cavity materials are studied. I show research towards improving our understanding of electropolishing (EP) utilizing electrochemical impedance spectroscopy (EIS). The relationship between Nb oxide formation and surface etching is investigated. The second material under study is Nb3Sn. Nb3Sn SRF cavities are more complex due to the presence of multiple elements and the complexity of thin film deposition. Nb3Sn thin films are studied to characterize their microstructure using 3D FIB tomography and a new mechanical polishing method is used to improve their surface roughness.

Subject Added Entry-Topical Term  

Materials science.

Subject Added Entry-Topical Term  

Analytical chemistry.

Subject Added Entry-Topical Term  

Electrical engineering.

Index Term-Uncontrolled  

Cavities

Index Term-Uncontrolled  

Niobium

Index Term-Uncontrolled  

Radiofrequency

Index Term-Uncontrolled  

Electropolishing

Index Term-Uncontrolled  

Electrochemical impedance spectroscopy

Added Entry-Corporate Name  

Northwestern University Materials Science and Engineering

Host Item Entry  

Dissertations Abstracts International. 86-06B.

Electronic Location and Access  

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Control Number  

joongbu:656664