Numerical and experimental study of atomic transport and Balmer line intensity in Linac4 negative ion source

T. Shibata, S. Mattei, K. Nishida, J. Lettry, A. Hatayama

Research output: Chapter in Book/Report/Conference proceedingConference contribution

8 Citations (Scopus)

Abstract

Time structure of Balmer H α line intensity in Linac4 RF plasma has been analyzed by the combined simulation model of atomic transport and Collisional-Radiative models. As a preliminary result, time variation of the line intensity in the ignition phase of RF plasma is calculated and compared with the experimental results by photometry. For the comparison, spatial distribution of the local H α photon emission rate at each time is calculated from the numerical model. The contribution of the local photon emission rates to the observed line intensity via optical viewing port is also investigated by application of the mock-up of the optical viewing port and the known light source. It has been clarified from the analyses that the higher and the lower peaks of the H α line intensity observed during 1 RF cycle is mainly due to the different spatial distributions in the electron energy distribution function and the resultant local photon emission rate. These results support previous suggestion that the existence of the capacitive electric field in axial direction leads to the higher/lower peaks of the line intensity.

Original languageEnglish
Title of host publication4th International Symposium on Negative Ions, Beams and Sources, NIBS 2014
EditorsWerner Kraus, Paul McNeely
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735412972
DOIs
Publication statusPublished - 2015 Apr 8
Event4th International Symposium on Negative Ions, Beams and Sources, NIBS 2014 - Garching, Germany
Duration: 2014 Oct 62014 Oct 10

Publication series

NameAIP Conference Proceedings
Volume1655
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference4th International Symposium on Negative Ions, Beams and Sources, NIBS 2014
CountryGermany
CityGarching
Period14/10/614/10/10

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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