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Article: Submillimeter focusing of the University of Hong Kong positron beam

TitleSubmillimeter focusing of the University of Hong Kong positron beam
Authors
KeywordsFocusing
Positron beam
SIMION
Soa immersion
Issue Date2002
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/apsusc
Citation
Applied Surface Science, 2002, v. 194 n. 1-4, p. 32-37 How to Cite?
AbstractThe slow positron beam facility Hong Kong submillimeter electron annihilator (HOSEA) at the University of Hong Kong has now been in operation for 6 years with a beam diameter of ∼6 mm and intensity ∼104e+s-1. It is now planned to improve the facility by narrowing the beam diameter to less than 1 mm, while increasing the intensity to ∼5 × 105e+s-1. The motivation behind the submillimeter beam is to make it a more effective tool in the study of MOS and MS systems that are hard to fabricate in larger than millimeter dimensions. In particular the development of positron deep level transient (thermal) spectroscopy (PDLTS) could also benefit from a beam of submillimeter dimensions. While consisting of a hybrid electric/magnetic lens structure close to the moderator to produce low canonical momentum phase space, the guidance to the target is purely magnetic. The beam structure is however unusual, consisting as it does of a recurrent re-focusing of the first primary positron focus produced by the hybrid focusing lens close to the moderator. The simulation program, SIMION, is employed to simulate the trajectories of positrons through possible hybrid lens structures and optimize the working parameters of the facility. The simulations show that an outstanding focusing diameter and a repetitive focusing can be obtained all the way to the target above beam energies of 1 keV. © 2002 Elsevier Science B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/80520
ISSN
2015 Impact Factor: 3.15
2015 SCImago Journal Rankings: 0.930
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorKwan, PYen_HK
dc.contributor.authorFung, Sen_HK
dc.contributor.authorBeling, CDen_HK
dc.date.accessioned2010-09-06T08:07:21Z-
dc.date.available2010-09-06T08:07:21Z-
dc.date.issued2002en_HK
dc.identifier.citationApplied Surface Science, 2002, v. 194 n. 1-4, p. 32-37en_HK
dc.identifier.issn0169-4332en_HK
dc.identifier.urihttp://hdl.handle.net/10722/80520-
dc.description.abstractThe slow positron beam facility Hong Kong submillimeter electron annihilator (HOSEA) at the University of Hong Kong has now been in operation for 6 years with a beam diameter of ∼6 mm and intensity ∼104e+s-1. It is now planned to improve the facility by narrowing the beam diameter to less than 1 mm, while increasing the intensity to ∼5 × 105e+s-1. The motivation behind the submillimeter beam is to make it a more effective tool in the study of MOS and MS systems that are hard to fabricate in larger than millimeter dimensions. In particular the development of positron deep level transient (thermal) spectroscopy (PDLTS) could also benefit from a beam of submillimeter dimensions. While consisting of a hybrid electric/magnetic lens structure close to the moderator to produce low canonical momentum phase space, the guidance to the target is purely magnetic. The beam structure is however unusual, consisting as it does of a recurrent re-focusing of the first primary positron focus produced by the hybrid focusing lens close to the moderator. The simulation program, SIMION, is employed to simulate the trajectories of positrons through possible hybrid lens structures and optimize the working parameters of the facility. The simulations show that an outstanding focusing diameter and a repetitive focusing can be obtained all the way to the target above beam energies of 1 keV. © 2002 Elsevier Science B.V. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/apsuscen_HK
dc.relation.ispartofApplied Surface Scienceen_HK
dc.rightsApplied Surface Science. Copyright © Elsevier BV.en_HK
dc.subjectFocusingen_HK
dc.subjectPositron beamen_HK
dc.subjectSIMIONen_HK
dc.subjectSoa immersionen_HK
dc.titleSubmillimeter focusing of the University of Hong Kong positron beamen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0169-4332&volume=194&spage=32&epage=37&date=2002&atitle=Submillimeter+focusing+of+the+University+of+Hong+Kong+positron+beamen_HK
dc.identifier.emailFung, S: sfung@hku.hken_HK
dc.identifier.emailBeling, CD: cdbeling@hkucc.hku.hken_HK
dc.identifier.authorityFung, S=rp00695en_HK
dc.identifier.authorityBeling, CD=rp00660en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/S0169-4332(02)00084-3en_HK
dc.identifier.scopuseid_2-s2.0-0037150608en_HK
dc.identifier.hkuros67410en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0037150608&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume194en_HK
dc.identifier.issue1-4en_HK
dc.identifier.spage32en_HK
dc.identifier.epage37en_HK
dc.identifier.isiWOS:000177499200009-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridKwan, PY=12243875000en_HK
dc.identifier.scopusauthoridFung, S=7201970040en_HK
dc.identifier.scopusauthoridBeling, CD=7005864180en_HK

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