Istraživanja kompleksnih oblika spektralnih linija berilijuma u prisustvu berilijumske prašine / Investigation of complex shapes of beryllium spectral lines in the presence of beryllium dust

Description

<p>Opisani&nbsp; su&nbsp; detalji&nbsp; konstrukcije&nbsp; novog&nbsp; izvora&nbsp; plazme, u impulsnom režimu, konstruisanog za&nbsp; potrebe ekscitacija linija berilijuma u&nbsp; prisustvu berilijumske&nbsp; pra&scaron;ine.&nbsp; Konstrukcija&nbsp; izvora&nbsp; je ostvarena&nbsp; na&nbsp; takav&nbsp; način&nbsp; da&nbsp; je&nbsp; sprečeno prodiranje&nbsp; čestica&nbsp; pra&scaron;ine&nbsp; u&nbsp; atmosferu&nbsp; laboratorije.&nbsp; Opisane&nbsp; su&nbsp; dodatne&nbsp; 2&nbsp; cevi&nbsp; za pražnjenje&nbsp; konstruisane&nbsp; od&nbsp; Al2O3 i&nbsp; SiO 2 . Pronađeni&nbsp; su&nbsp; i&nbsp; opisani&nbsp; optimalni&nbsp; uslovi&nbsp; za&nbsp; rad<br />izvora&nbsp; plazme.&nbsp; Vrednosti&nbsp; elektronske&nbsp; koncentracije,&nbsp; određene&nbsp; nakon&nbsp; maksimuma<br />struje,&nbsp; kori&scaron;ćenjem&nbsp; vodonikove&nbsp; balmer&nbsp; beta linije,&nbsp; kreću&nbsp; se&nbsp; u&nbsp; opsegu&nbsp; 1,16-9,2&nbsp; ∙10<br />22&nbsp; m -3 . Elektronska temperatura je određena&nbsp; na&nbsp; osnovu relativnih&nbsp; intenziteta&nbsp; linija&nbsp; dva&nbsp; uzastopna jonizaciona&nbsp; stanja&nbsp; istog&nbsp; elementa&nbsp; i&nbsp; kreće&nbsp; se&nbsp; u opsegu&nbsp; 10&nbsp; 500-15&nbsp; 500&nbsp; K.&nbsp; Prikazane&nbsp; su snimljene&nbsp; linije&nbsp; berilijuma,&nbsp; osim&nbsp; rezonantnih. Dato&nbsp; je&nbsp; poređenje&nbsp; snimljenih&nbsp; linija&nbsp; sa postojećim&nbsp; teorisjkim&nbsp; podacima.&nbsp; Dve&nbsp; linije berilijuma&nbsp; koje&nbsp; se&nbsp; pojavljuju&nbsp; sa&nbsp; zabranjenom komponentom su prikazane prvi put. Pokazano je&nbsp; da&nbsp; postoji&nbsp; tipičan&nbsp; trend&nbsp; zavisnosti&nbsp; odnosa dozvoljene&nbsp; i&nbsp; zabranjene&nbsp; komponente,&nbsp; kao&nbsp; i rastojanja&nbsp; između&nbsp; položaja&nbsp; maksimuma intenziteta ove dve komponente, od elektronske koncentracije,&nbsp; koji&nbsp; se&nbsp; javlja&nbsp; kod&nbsp; linija&nbsp; sa zabranjenim&nbsp; komponentama,&nbsp;&nbsp;&nbsp; &scaron;to&nbsp; govori&nbsp; o<br />mogućnosti ove linije za primenu u dijagnostici plazme.</p> / <p>Construction&nbsp; details&nbsp; of&nbsp; new&nbsp; plasma&nbsp; source,&nbsp; running in pulsed regime,&nbsp; for beryllium spectral line&nbsp; studies,&nbsp; in&nbsp; the&nbsp; presence&nbsp; of&nbsp; beryllium&nbsp; dust particles are presented.&nbsp; The construction of the source&nbsp; was&nbsp; realised&nbsp; in&nbsp; such&nbsp; a&nbsp; way&nbsp; that&nbsp; it prevented&nbsp; the&nbsp; ingress&nbsp; of&nbsp; dust&nbsp; particles&nbsp; into&nbsp; the laboratory&nbsp; atmospher.&nbsp; Construction&nbsp; details&nbsp; and<br />testing&nbsp; of&nbsp; BeO&nbsp; discharge&nbsp; tube&nbsp; in&nbsp; comparison with&nbsp; SiO2 and&nbsp; Al2O3 discharge&nbsp; tubes&nbsp; are&nbsp; presented,&nbsp; also.&nbsp; Optimal&nbsp; conditions&nbsp; for&nbsp; plasma source operation&nbsp; and beryllium line studies are found.&nbsp; The&nbsp; electron&nbsp; density&nbsp; measured&nbsp; after discharge current maximum is determined from&nbsp; the peak separation of the hydrogen Balmer beta<br />spectral&nbsp; line,&nbsp; and&nbsp; the&nbsp; electron&nbsp; temperature&nbsp; is&nbsp; determined&nbsp; from&nbsp; the&nbsp; ratios&nbsp; of&nbsp; the&nbsp; relative&nbsp; intensities&nbsp; of&nbsp; Be&nbsp; spectral&nbsp; lines&nbsp; emitted&nbsp; from successive&nbsp; ionized&nbsp; stages&nbsp; of&nbsp; atoms.&nbsp; Maximum values&nbsp; of&nbsp; electron&nbsp; density&nbsp; and&nbsp; temperature&nbsp; are measured&nbsp; to&nbsp; be&nbsp; 9.3∙1022 m -3 and&nbsp; 16&nbsp; 800&nbsp; K, respectively.&nbsp; The&nbsp; recorded&nbsp; spectral&nbsp; lines&nbsp; of beryllium,&nbsp; other&nbsp; then&nbsp; resonant&nbsp; lines,&nbsp; are&nbsp; presented. The lines&nbsp; with forbidden component are&nbsp; described&nbsp; for&nbsp; the&nbsp; first&nbsp; time.&nbsp; The&nbsp; functional dependence of the wavelength separation range and&nbsp; peak&nbsp; intensity&nbsp; ratio&nbsp; of&nbsp; these&nbsp; lines&nbsp; upon<br />electron&nbsp; number&nbsp; density&nbsp; suggests&nbsp; the&nbsp; complex profile of the forbidden and allowed line, which can be used for diagnostics of low-temperature beryllium containing plasmas.</p>

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1. https://www.cris.uns.ac.rs/DownloadFileServlet/Disertacija159065143207037.pdf?controlNumber=(BISIS)114644&fileName=159065143207037.pdf&id=15487&source=NDLTD&language=en
2. https://www.cris.uns.ac.rs/record.jsf?recordId=114644&source=NDLTD&language=en

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Identifer	oai:union.ndltd.org:uns.ac.rs/oai:CRISUNS:(BISIS)114644
Date	03 August 2020
Creators	Stankov Biljana
Contributors	Savić Igor, Ivković Milivoje, Djurović Stevica, Obradović Bratislav, Gavanski Lazar
Publisher	Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, University of Novi Sad, Faculty of Sciences at Novi Sad
Source Sets	University of Novi Sad
Language	Serbian
Detected Language	English
Type	PhD thesis