Improved tungsten moderator structures for slow positron beams
Tungsten filaments from commercial incandescent light bulbs have been tested as slow positron moderators. The filaments were annealed by electric current in the neutral gas atmosphere of the bulbs at or above the normal operating temperature of the lamp. The total efficiency of the positron source/m...
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| Veröffentlicht in: | Applied surface science 2002-06, Vol.194 (1), p.16-19 |
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| creator | Liszkay, L Kajcsos, Zs Barthe, M.-F Henry, L Duplâtre, G Nagy, A |
| description | Tungsten filaments from commercial incandescent light bulbs have been tested as slow positron moderators. The filaments were annealed by electric current in the neutral gas atmosphere of the bulbs at or above the normal operating temperature of the lamp. The total efficiency of the positron source/moderator assembly was found to be as high as 4×10
−4. This value is almost doubled at high extraction voltage (3000
V). Neither the annealing temperature (i.e. the heating current) nor the filament thickness (related to the nominal power of the lamp) affected significantly the moderation efficiency, most probably due to the relatively thick filaments used and the difficulties in controlling the source geometry. It is suggested that the moderation efficiency can be further improved by using structures with thinner tungsten patterns, optimised configuration and extraction electric field. |
| doi_str_mv | 10.1016/S0169-4332(02)00105-8 |
| format | Article |
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−4. This value is almost doubled at high extraction voltage (3000
V). Neither the annealing temperature (i.e. the heating current) nor the filament thickness (related to the nominal power of the lamp) affected significantly the moderation efficiency, most probably due to the relatively thick filaments used and the difficulties in controlling the source geometry. It is suggested that the moderation efficiency can be further improved by using structures with thinner tungsten patterns, optimised configuration and extraction electric field.</description><identifier>ISSN: 0169-4332</identifier><identifier>EISSN: 1873-5584</identifier><identifier>DOI: 10.1016/S0169-4332(02)00105-8</identifier><language>eng</language><publisher>Amsterdam: Elsevier B.V</publisher><subject>Charged-particle beams ; Electromagnetism; electron and ion optics ; Electron and positron beams ; Exact sciences and technology ; Fundamental areas of phenomenology (including applications) ; Nuclear Experiment ; Physics ; Positron annihilation ; Positron moderator ; Slow positron beam ; Tungsten</subject><ispartof>Applied surface science, 2002-06, Vol.194 (1), p.16-19</ispartof><rights>2002 Elsevier Science B.V.</rights><rights>2003 INIST-CNRS</rights><rights>Distributed under a Creative Commons Attribution 4.0 International License</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c373t-b00e54871e9310d13498895cb5c505ef5abf6a313022ba983ed6e54aa9ff984b3</citedby><cites>FETCH-LOGICAL-c373t-b00e54871e9310d13498895cb5c505ef5abf6a313022ba983ed6e54aa9ff984b3</cites><orcidid>0000-0002-0170-9498</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S0169433202001058$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>230,309,310,314,776,780,785,786,881,3537,23909,23910,25118,27901,27902,65306</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=13831369$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://in2p3.hal.science/in2p3-00012619$$DView record in HAL$$Hfree_for_read</backlink></links><search><creatorcontrib>Liszkay, L</creatorcontrib><creatorcontrib>Kajcsos, Zs</creatorcontrib><creatorcontrib>Barthe, M.-F</creatorcontrib><creatorcontrib>Henry, L</creatorcontrib><creatorcontrib>Duplâtre, G</creatorcontrib><creatorcontrib>Nagy, A</creatorcontrib><title>Improved tungsten moderator structures for slow positron beams</title><title>Applied surface science</title><description>Tungsten filaments from commercial incandescent light bulbs have been tested as slow positron moderators. The filaments were annealed by electric current in the neutral gas atmosphere of the bulbs at or above the normal operating temperature of the lamp. The total efficiency of the positron source/moderator assembly was found to be as high as 4×10
−4. This value is almost doubled at high extraction voltage (3000
V). Neither the annealing temperature (i.e. the heating current) nor the filament thickness (related to the nominal power of the lamp) affected significantly the moderation efficiency, most probably due to the relatively thick filaments used and the difficulties in controlling the source geometry. It is suggested that the moderation efficiency can be further improved by using structures with thinner tungsten patterns, optimised configuration and extraction electric field.</description><subject>Charged-particle beams</subject><subject>Electromagnetism; electron and ion optics</subject><subject>Electron and positron beams</subject><subject>Exact sciences and technology</subject><subject>Fundamental areas of phenomenology (including applications)</subject><subject>Nuclear Experiment</subject><subject>Physics</subject><subject>Positron annihilation</subject><subject>Positron moderator</subject><subject>Slow positron beam</subject><subject>Tungsten</subject><issn>0169-4332</issn><issn>1873-5584</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2002</creationdate><recordtype>article</recordtype><recordid>eNqFkNFKwzAUhoMoOKePIPRGUKSaNE2X3ChjqBsMvFCvQ5qeaKRrSpJNfHtTK3ophIRDvi8550folOArgkl1_ZQ2kZeUFue4uMCYYJbzPTQhfEZzxni5jya_yCE6CuE9QUW6naCb1ab3bgdNFrfda4jQZRvXgFfR-SxEv9Vx6yFkZihb95H1LtjoXZfVoDbhGB0Y1QY4-Tmn6OX-7nmxzNePD6vFfJ1rOqMxrzEGVvIZAUEJbggtBeeC6ZpphhkYpmpTKUooLopaCU6hqZKglDBG8LKmU3Q5vvumWtl7u1H-Uzpl5XK-lrYreirxMFNFxI4kmo209i4ED-ZXIVgOkcnvyOSQh8RpDZFJnryz0etV0Ko1XnXahj-Z8tRiJRJ3O3KQRt5Z8DJoC52GxnrQUTbO_vPTF4JHf1E</recordid><startdate>20020621</startdate><enddate>20020621</enddate><creator>Liszkay, L</creator><creator>Kajcsos, Zs</creator><creator>Barthe, M.-F</creator><creator>Henry, L</creator><creator>Duplâtre, G</creator><creator>Nagy, A</creator><general>Elsevier B.V</general><general>Elsevier Science</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>1XC</scope><orcidid>https://orcid.org/0000-0002-0170-9498</orcidid></search><sort><creationdate>20020621</creationdate><title>Improved tungsten moderator structures for slow positron beams</title><author>Liszkay, L ; Kajcsos, Zs ; Barthe, M.-F ; Henry, L ; Duplâtre, G ; Nagy, A</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c373t-b00e54871e9310d13498895cb5c505ef5abf6a313022ba983ed6e54aa9ff984b3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2002</creationdate><topic>Charged-particle beams</topic><topic>Electromagnetism; electron and ion optics</topic><topic>Electron and positron beams</topic><topic>Exact sciences and technology</topic><topic>Fundamental areas of phenomenology (including applications)</topic><topic>Nuclear Experiment</topic><topic>Physics</topic><topic>Positron annihilation</topic><topic>Positron moderator</topic><topic>Slow positron beam</topic><topic>Tungsten</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Liszkay, L</creatorcontrib><creatorcontrib>Kajcsos, Zs</creatorcontrib><creatorcontrib>Barthe, M.-F</creatorcontrib><creatorcontrib>Henry, L</creatorcontrib><creatorcontrib>Duplâtre, G</creatorcontrib><creatorcontrib>Nagy, A</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Hyper Article en Ligne (HAL)</collection><jtitle>Applied surface science</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Liszkay, L</au><au>Kajcsos, Zs</au><au>Barthe, M.-F</au><au>Henry, L</au><au>Duplâtre, G</au><au>Nagy, A</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Improved tungsten moderator structures for slow positron beams</atitle><jtitle>Applied surface science</jtitle><date>2002-06-21</date><risdate>2002</risdate><volume>194</volume><issue>1</issue><spage>16</spage><epage>19</epage><pages>16-19</pages><issn>0169-4332</issn><eissn>1873-5584</eissn><abstract>Tungsten filaments from commercial incandescent light bulbs have been tested as slow positron moderators. The filaments were annealed by electric current in the neutral gas atmosphere of the bulbs at or above the normal operating temperature of the lamp. The total efficiency of the positron source/moderator assembly was found to be as high as 4×10
−4. This value is almost doubled at high extraction voltage (3000
V). Neither the annealing temperature (i.e. the heating current) nor the filament thickness (related to the nominal power of the lamp) affected significantly the moderation efficiency, most probably due to the relatively thick filaments used and the difficulties in controlling the source geometry. It is suggested that the moderation efficiency can be further improved by using structures with thinner tungsten patterns, optimised configuration and extraction electric field.</abstract><cop>Amsterdam</cop><pub>Elsevier B.V</pub><doi>10.1016/S0169-4332(02)00105-8</doi><tpages>4</tpages><orcidid>https://orcid.org/0000-0002-0170-9498</orcidid></addata></record> |
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| ispartof | Applied surface science, 2002-06, Vol.194 (1), p.16-19 |
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| language | eng |
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| source | Elsevier ScienceDirect Journals |
| subjects | Charged-particle beams Electromagnetism electron and ion optics Electron and positron beams Exact sciences and technology Fundamental areas of phenomenology (including applications) Nuclear Experiment Physics Positron annihilation Positron moderator Slow positron beam Tungsten |
| title | Improved tungsten moderator structures for slow positron beams |
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