Cryodetector readout for direct dark matter searches
<p>The next generation of cryodetector arrays for direct WIMP searches will aim to achieve large increases in WIMP-nucleon scattering target mass, an order of magnitude or more greater than existing detector arrays. The implementation of high-resolution measurements and background suppression...
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| Format: | Thesis |
| Language: | English |
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2012
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| _version_ | 1797090471727595520 |
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| author | Ingleby, S |
| author2 | Kraus, H |
| author_facet | Kraus, H Ingleby, S |
| author_sort | Ingleby, S |
| collection | OXFORD |
| description | <p>The next generation of cryodetector arrays for direct WIMP searches will aim to achieve large increases in WIMP-nucleon scattering target mass, an order of magnitude or more greater than existing detector arrays. The implementation of high-resolution measurements and background suppression by event discrimination will remain of paramount importance. Hardware development must be undertaken to increase the availability and density of readout channels while maintaining low-noise, low-heatload, high-radiopurity cryodetector performance. This thesis describes the development of scalable cryogenic cabling using etched metal foil fabrication techniques and the development of low-temperature high-voltage power supply for scintillation light readout using photomultiplier tubes.</p> <p>Etched metal foil cables were developed for cryodetector readout. Fabrication techniques for low-heatload, low-cost cabling were developed and commissioning tests were carried out to verify low-noise performance in both low-impedance and high-impedance cryodetector readout schemes. SQUID readout cabling with a heatload cost 24 times lower than existing cabling was installed and mean SQUID noise of 5.5 pAHz<sup>-1/2</sup> was measured with low-impedance input.</p> <p>Photomultiplier tubes can be used for cryogenic scintillation light measurement, a key technique in cryodetector event discrimination. A low-heatload, low-noise photomultiplier tube power supply circuit was developed. Measurements of cryogenic scintillation light from a CaWO4 crystal were carried out using a CWG/PMT module cooled to 0.95 mK. </p> |
| first_indexed | 2024-03-07T03:19:05Z |
| format | Thesis |
| id | oxford-uuid:b6d12805-7c91-4d34-a2ef-9c515d898905 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T03:19:05Z |
| publishDate | 2012 |
| record_format | dspace |
| spelling | oxford-uuid:b6d12805-7c91-4d34-a2ef-9c515d8989052022-03-27T04:43:44ZCryodetector readout for direct dark matter searchesThesishttp://purl.org/coar/resource_type/c_db06uuid:b6d12805-7c91-4d34-a2ef-9c515d898905Particle physicsEnglish2012Ingleby, SKraus, H<p>The next generation of cryodetector arrays for direct WIMP searches will aim to achieve large increases in WIMP-nucleon scattering target mass, an order of magnitude or more greater than existing detector arrays. The implementation of high-resolution measurements and background suppression by event discrimination will remain of paramount importance. Hardware development must be undertaken to increase the availability and density of readout channels while maintaining low-noise, low-heatload, high-radiopurity cryodetector performance. This thesis describes the development of scalable cryogenic cabling using etched metal foil fabrication techniques and the development of low-temperature high-voltage power supply for scintillation light readout using photomultiplier tubes.</p> <p>Etched metal foil cables were developed for cryodetector readout. Fabrication techniques for low-heatload, low-cost cabling were developed and commissioning tests were carried out to verify low-noise performance in both low-impedance and high-impedance cryodetector readout schemes. SQUID readout cabling with a heatload cost 24 times lower than existing cabling was installed and mean SQUID noise of 5.5 pAHz<sup>-1/2</sup> was measured with low-impedance input.</p> <p>Photomultiplier tubes can be used for cryogenic scintillation light measurement, a key technique in cryodetector event discrimination. A low-heatload, low-noise photomultiplier tube power supply circuit was developed. Measurements of cryogenic scintillation light from a CaWO4 crystal were carried out using a CWG/PMT module cooled to 0.95 mK. </p> |
| spellingShingle | Particle physics Ingleby, S Cryodetector readout for direct dark matter searches |
| title | Cryodetector readout for direct dark matter searches |
| title_full | Cryodetector readout for direct dark matter searches |
| title_fullStr | Cryodetector readout for direct dark matter searches |
| title_full_unstemmed | Cryodetector readout for direct dark matter searches |
| title_short | Cryodetector readout for direct dark matter searches |
| title_sort | cryodetector readout for direct dark matter searches |
| topic | Particle physics |
| work_keys_str_mv | AT inglebys cryodetectorreadoutfordirectdarkmattersearches |