Investigation of barrier discharges operated in He/N 2 - and He/O 2 - PowerPoint PPT Presentation

Investigation of barrier discharges operated in He/N 2 - and He/O 2 -mixtures R. Tschiersch, M. Bogaczyk, L. Dosoudilova, S. Nemschokmichal, J. Meichsner, and H.-E. Wagner 4 th Graduate Summer Institute ''Complex Plasmas'' July 31, 2014

Outline 1 Introduction & Motivation 2 Set-up & Diagnostics 3 Selected Results 3.1 Barrier discharge in He/N 2 3.2 Barrier discharge in He/O 2 4 Summary & Outlook R. Tschiersch 4 th Graduate Summer Institute, July 31 – August 8, 2014 1/13

Introduction & Motivation R. Tschiersch 4 th Graduate Summer Institute, July 31 – August 8, 2014 2/13

Introduction & Motivation R. Tschiersch 4 th Graduate Summer Institute, July 31 – August 8, 2014 3/13

Outline 1 Introduction & Motivation 2 Set-up & Diagnostics 3 Selected Results 3.1 Barrier discharge in He/N 2 3.2 Barrier discharge in He/O 2 4 Summary & Outlook R. Tschiersch 4 th Graduate Summer Institute, July 31 – August 8, 2014

Set-up & Diagnostics R. Tschiersch 4 th Graduate Summer Institute, July 31 – August 8, 2014 4/13

Set-up & Diagnostics S. Nemschokmichal et. al. (2012) Plasma Sources Sci. and Technol. 22 015005 M. Bogaczyk et. al. (2012) J. Phys. D: Appl. Phys. 45 465202 R. Tschiersch 4 th Graduate Summer Institute, July 31 – August 8, 2014 5/13

Outline 1 Introduction & Motivation 2 Set-up & Diagnostics 3 Selected Results 3.1 Barrier discharge in He/N 2 3.2 Barrier discharge in He/O 2 4 Summary & Outlook R. Tschiersch 4 th Graduate Summer Institute, July 31 – August 8, 2014

Selected Results Barrier discharge in He/N 2 R. Tschiersch et. al . (2014) J. Phys. D: Appl. Phys . (101839.R1) 4 th Graduate Summer Institute, July 31 – August 8, 2014 R. Tschiersch 6/13

Selected Results Barrier discharge in He/N 2 M. Bogaczyk et. al. (2013) J. Phys. D: Appl. Phys. 67 212-22 R. Tschiersch et. al . (2014) J. Phys. D: Appl. Phys . (101839.R1) 4 th Graduate Summer Institute, July 31 – August 8, 2014 R. Tschiersch 7/13

Selected Results Barrier discharge in He/N 2 M. Bogaczyk et. al. (2013) J. Phys. D: Appl. Phys. 67 212-22 R. Tschiersch et. al . (2014) J. Phys. D: Appl. Phys . (101839.R1) 4 th Graduate Summer Institute, July 31 – August 8, 2014 R. Tschiersch 7/13

Selected Results Barrier discharge in He/N 2 N 2 SPS N 2 ( X )+ e → N 2 ( C )+ e N 2 ( A ) + N 2 ( A ) → N 2 ( C )+ N 2 ( X ) NO γ NO ( X )+ N 2 ( A ) → NO ( A )+ N 2 ( X ) He I ( * ) + e → He * + e He N 2 + FNS + ( B )+ e N 2 ( X )+ e → N 2 m → N 2 m / He 2 + ( B )+ He / 2He N 2 ( X )+ He + → N 2 + / He 2 + ( B )+ He m / He 2 m N 2 ( X )+ He R. Tschiersch et. al . (2014) J. Phys. D: Appl. Phys . (101839.R1) 4 th Graduate Summer Institute, July 31 – August 8, 2014 R. Tschiersch 8/13

Selected Results Barrier discharge in He/N 2 R. Tschiersch et. al . (2014) J. Phys. D: Appl. Phys . (101839.R1) R. Tschiersch et. al . (2014) HAKONE XIV (contrib. paper) 4 th Graduate Summer Institute, July 31 – August 8, 2014 R. Tschiersch 9/13

Selected Results Barrier discharge in He/N 2 R. Tschiersch et. al . (2014) J. Phys. D: Appl. Phys . (101839.R1) F. Massines et. al . (2003) Surf. Coat. Tech. 174 5 - 8 4 th Graduate Summer Institute, July 31 – August 8, 2014 R. Tschiersch 9/13

Outline 1 Introduction & Motivation 2 Set-up & Diagnostics 3 Selected Results 3.1 Barrier discharge in He/N 2 3.2 Barrier discharge in He/O 2 4 Summary & Outlook R. Tschiersch 4 th Graduate Summer Institute, July 31 – August 8, 2014

Selected Results Barrier discharge in He/O 2 R. Tschiersch et. al . (2014) HAKONE XIV (contrib. paper) L. Dosoudilová et. al. (in preparation) 4 th Graduate Summer Institute, July 31 – August 8, 2014 R. Tschiersch 10/13

Selected Results Barrier discharge in He/O 2 R. Tschiersch et. al . (2014) HAKONE XIV (contrib. paper) L. Dosoudilová et. al. (in preparation) 4 th Graduate Summer Institute, July 31 – August 8, 2014 R. Tschiersch 10/13

Selected Results Barrier discharge in He/O 2 B. Eliasson et. al . (1994) Pure & Appl. Chem. 66 radius of MDs 1 r ∝ n ⋅ d (α − η)/ d ( E / n ) R. Tschiersch et. al . (2014) HAKONE XIV (contrib. paper) L. Dosoudilová et. al. (in preparation) 4 th Graduate Summer Institute, July 31 – August 8, 2014 R. Tschiersch 10/13

Selected Results Barrier discharge in He/O 2 N 2 + FNS m → N 2 m / He 2 + ( B )+ e + He / 2He N 2 ( X )+ He + → N 2 + / He 2 + ( B )+ e + He m / He 2 m N 2 ( X )+ He He I ( * ) + e → He * + e He Influence of oxygen admixture m → O 2 + + e + He / 2He m / He 2 O 2 + He + → O 2 + + e + He + / He 2 m / He 2 m O 2 + He + + e → O * + O * O 2 * + O * + e - / O * + O O 2 + e → O + + O - → O 2 + O * O 2 L. Dosoudilová et. al. (in preparation) G. Myers et. al. (1977) J. Chem. Phys. 67 3352 - 59 4 th Graduate Summer Institute, July 31 – August 8, 2014 R. Tschiersch 11/13

Selected Results Barrier discharge in He/O 2 L. Dosoudilová et. al. (in preparation) 4 th Graduate Summer Institute, July 31 – August 8, 2014 R. Tschiersch 12/13

Outline 1 Introduction & Motivation 2 Set-up & Diagnostics 3 Selected Results 3.1 Barrier discharge in He/N 2 3.2 Barrier discharge in He/O 2 4 Summary & Outlook R. Tschiersch 4 th Graduate Summer Institute, July 31 – August 8, 2014

Summary & Outlook Formation of diffuse and filamentary BDs in He/N 2 and He/O 2 4 th Graduate Summer Institute, July 31 – August 8, 2014 R. Tschiersch 13/13

Summary & Outlook Formation of diffuse and filamentary BDs in He/N 2 and He/O 2 Influence of metastables on plasma chemistry and discharge mode 4 th Graduate Summer Institute, July 31 – August 8, 2014 R. Tschiersch 13/13

Summary & Outlook Formation of diffuse and filamentary BDs in He/N 2 and He/O 2 Influence of metastables on plasma chemistry and discharge mode Correlation between emission development and discharge current 4 th Graduate Summer Institute, July 31 – August 8, 2014 R. Tschiersch 13/13

Summary & Outlook Formation of diffuse and filamentary BDs in He/N 2 and He/O 2 Influence of metastables on plasma chemistry and discharge mode Correlation between emission development and discharge current 4 th Graduate Summer Institute, July 31 – August 8, 2014 R. Tschiersch 13/13