Tomographic Analysis of SRF Cavities as Asymmetric Plasma Reactors

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The tomographic reconstruction of local plasma parameters for nonequilibrium plasma sources is a developing approach, which has a great potential in understanding the fundamental processes and phenomena during plasma processing of SRF cavity walls. Any type of SRF cavity presents a plasma rector with limited or distorted symmetry and possible presence of high gradients. Development of the tomographic method for SRF plasma analysis consists of several steps. First, we define the method based on the inversion of the Abel integral equation for a hollow spherical reactor. Second step is application of the method for the actual elliptical cavity shape. Third ... continued below

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M. Nikolić, A.L. Godunov, S. Popović, A. Samolov, J. Upadhyay, L. Vušković, H.L. Phillips, A-M. Valente-Feliciano May 1, 2010.

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The tomographic reconstruction of local plasma parameters for nonequilibrium plasma sources is a developing approach, which has a great potential in understanding the fundamental processes and phenomena during plasma processing of SRF cavity walls. Any type of SRF cavity presents a plasma rector with limited or distorted symmetry and possible presence of high gradients. Development of the tomographic method for SRF plasma analysis consists of several steps. First, we define the method based on the inversion of the Abel integral equation for a hollow spherical reactor. Second step is application of the method for the actual elliptical cavity shape. Third step consists of study of the effects of various shapes of the driven electrode. Final step consists of testing the observed line-integrated optical emission data. We will show the typical results in each step and the final result will be presented in the form of correlation between local plasma parameter distributions and local etching characteristics.

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  • IPAC'10, 23-28 May 2010, Kyoto, Japan

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  • Report No.: JLAB-ACC-11-1358
  • Report No.: DOE/OR/23177-1601
  • Grant Number: AC05-06OR23177
  • Office of Scientific & Technical Information Report Number: 1020721
  • Archival Resource Key: ark:/67531/metadc840850

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  • May 1, 2010

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  • May 19, 2016, 3:16 p.m.

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  • Aug. 3, 2016, 6:07 p.m.

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M. Nikolić, A.L. Godunov, S. Popović, A. Samolov, J. Upadhyay, L. Vušković, H.L. Phillips, A-M. Valente-Feliciano. Tomographic Analysis of SRF Cavities as Asymmetric Plasma Reactors, article, May 1, 2010; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc840850/: accessed January 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.