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The design and analysis of a DC SQUID for a SQUID microscope
Thesis (MScEng (Electrical and Electronic Engineering))--Stellenbosch University, 2008.
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| Format: | Thesis |
| Language: | English |
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Stellenbosch : Stellenbosch University
2008
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| _version_ | 1867613973262630912 |
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| access_status_str | Open Access |
| author | Burger, Willem Adriaan |
| author2 | Perold, W. J. |
| author_browse | Burger, Willem Adriaan Perold, W. J. |
| author_facet | Perold, W. J. Burger, Willem Adriaan |
| author_sort | Burger, Willem Adriaan |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (MScEng (Electrical and Electronic Engineering))--Stellenbosch University, 2008. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/2239 |
| institution | Stellenbosch University (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:44:38.662Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2008 |
| publishDateRange | 2008 |
| publishDateSort | 2008 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/2239 The design and analysis of a DC SQUID for a SQUID microscope Burger, Willem Adriaan Perold, W. J. Stellenbosch University. Faculty of Engineering. Dept. of Electrical and Electronic Engineering. SQUID microscope Superconductors Dissertations -- Electronic engineering Theses -- Electronic engineering Electrical and Electronic Engineering Thesis (MScEng (Electrical and Electronic Engineering))--Stellenbosch University, 2008. This thesis relates to the analysis and design of a SQUID microscope. Superconductor theory is discussed in depth to provide a thorough understanding of Josephson junctions and of dc SQUID magnetometers. The behaviour and suitability of different types of single-layer dc SQUIDs are looked at. The quality of the superconducting material patterned onto a substrate and the Josephson junction design used affect the behaviour of a practical dc SQUID. Noise and cooling play an integral part in the design and operation of a dc SQUID. The source of noise is looked at in an effort to minimize its effect. Cryocooling is essential to real world operation so different cooling strategies and their consequences are analyzed. This thesis focuses on modeling the behaviour of the dc SQUID to creating a practical system for use inside a SQUID microscope. Operating the dc SQUID with the appropriate electronics will linearize the device, reduce the effect of noise, and create a device with wide bandwidth. Each step in creating a practical system is discussed in detail. Simulations are used to create models predicting the behaviour of the dc SQUID and the electronics. They are then used to design and create practical electronic systems. Measurements are performed on Josephson junctions and dc SQUID magnetometers using the designed electronics. The Josephson junctions behave as predicted and were successfully tested. The dc SQUIDs did not behave as predicted and were not successfully tested. The SQUIDs were damaged, either by a malfunction in the cryocooler or through age related deterioration. A full test of the flux-locked loop was not possible and the dc SQUID was not linearized. 2008-12-03T07:47:17Z 2010-06-01T08:44:05Z 2008-12-03T07:47:17Z 2010-06-01T08:44:05Z 2008-12 Thesis http://hdl.handle.net/10019.1/2239 en Stellenbosch University application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | SQUID microscope Superconductors Dissertations -- Electronic engineering Theses -- Electronic engineering Electrical and Electronic Engineering Burger, Willem Adriaan The design and analysis of a DC SQUID for a SQUID microscope |
| title | The design and analysis of a DC SQUID for a SQUID microscope |
| title_full | The design and analysis of a DC SQUID for a SQUID microscope |
| title_fullStr | The design and analysis of a DC SQUID for a SQUID microscope |
| title_full_unstemmed | The design and analysis of a DC SQUID for a SQUID microscope |
| title_short | The design and analysis of a DC SQUID for a SQUID microscope |
| title_sort | design and analysis of a dc squid for a squid microscope |
| topic | SQUID microscope Superconductors Dissertations -- Electronic engineering Theses -- Electronic engineering Electrical and Electronic Engineering |
| url | http://hdl.handle.net/10019.1/2239 |
| work_keys_str_mv | AT burgerwillemadriaan thedesignandanalysisofadcsquidforasquidmicroscope AT burgerwillemadriaan designandanalysisofadcsquidforasquidmicroscope |