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

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

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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

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SLIDE 1

July 31, 2014

Investigation of barrier discharges operated in

  • R. Tschiersch, M. Bogaczyk, L. Dosoudilova,
  • S. Nemschokmichal, J. Meichsner, and H.-E. Wagner

He/N2- and He/O2-mixtures

4th Graduate Summer Institute ''Complex Plasmas''

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SLIDE 2

1 Introduction & Motivation 2 Set-up & Diagnostics 4 Summary & Outlook

3.1 Barrier discharge in He/N2 3.2 Barrier discharge in He/O2

Outline

3 Selected Results

  • R. Tschiersch

4th Graduate Summer Institute, July 31 – August 8, 2014 1/13

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SLIDE 3

Introduction & Motivation

  • R. Tschiersch

4th Graduate Summer Institute, July 31 – August 8, 2014 2/13

slide-4
SLIDE 4

Introduction & Motivation

  • R. Tschiersch

4th Graduate Summer Institute, July 31 – August 8, 2014 3/13

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SLIDE 5

1 Introduction & Motivation 2 Set-up & Diagnostics 4 Summary & Outlook

3.1 Barrier discharge in He/N2 3.2 Barrier discharge in He/O2

Outline

3 Selected Results

  • R. Tschiersch

4th Graduate Summer Institute, July 31 – August 8, 2014

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SLIDE 6

Set-up & Diagnostics

  • R. Tschiersch

4th Graduate Summer Institute, July 31 – August 8, 2014 4/13

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SLIDE 7

Set-up & Diagnostics

  • R. Tschiersch

4th Graduate Summer Institute, July 31 – August 8, 2014 5/13

  • M. Bogaczyk et. al. (2012)
  • J. Phys. D: Appl. Phys. 45 465202
  • S. Nemschokmichal et. al. (2012)

Plasma Sources Sci. and Technol. 22 015005

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SLIDE 8

1 Introduction & Motivation 2 Set-up & Diagnostics 4 Summary & Outlook

3.1 Barrier discharge in He/N2 3.2 Barrier discharge in He/O2

Outline

3 Selected Results

  • R. Tschiersch

4th Graduate Summer Institute, July 31 – August 8, 2014

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SLIDE 9

Selected Results

  • R. Tschiersch

4th Graduate Summer Institute, July 31 – August 8, 2014

Barrier discharge in He/N2

6/13

  • R. Tschiersch et. al. (2014) J. Phys. D: Appl. Phys. (101839.R1)
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SLIDE 10

Selected Results

  • R. Tschiersch

4th Graduate Summer Institute, July 31 – August 8, 2014 7/13

  • M. Bogaczyk et. al. (2013) J. Phys. D: Appl. Phys. 67 212-22

Barrier discharge in He/N2

  • R. Tschiersch et. al. (2014) J. Phys. D: Appl. Phys. (101839.R1)
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SLIDE 11

Selected Results

  • R. Tschiersch

4th Graduate Summer Institute, July 31 – August 8, 2014 7/13

Barrier discharge in He/N2

  • 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)
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SLIDE 12

Selected Results

  • R. Tschiersch

4th Graduate Summer Institute, July 31 – August 8, 2014 8/13

Barrier discharge in He/N2

  • R. Tschiersch et. al. (2014) J. Phys. D: Appl. Phys. (101839.R1)

N2

+ FNS

N2 SPS NOγ He I

N2( X )+ e → N2(C)+ e N2(A) + N2(A) → N 2(C)+ N2(X ) NO( X )+ N2(A) → NO(A)+ N2(X ) He

(*) + e → He *+ e

N2( X )+ e → N2

+(B)+ e

N2( X )+ He

m/ He2 m → N2 +(B)+ He/ 2He

N2( X )+ He

+/He2 + → N2 +(B)+ He m/He2 m

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SLIDE 13

Selected Results

  • R. Tschiersch

4th Graduate Summer Institute, July 31 – August 8, 2014 9/13

Barrier discharge in He/N2

  • R. Tschiersch et. al. (2014) HAKONE XIV (contrib. paper)
  • R. Tschiersch et. al. (2014) J. Phys. D: Appl. Phys. (101839.R1)
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SLIDE 14

Selected Results

  • R. Tschiersch

4th Graduate Summer Institute, July 31 – August 8, 2014 9/13

Barrier discharge in He/N2

  • F. Massines et. al. (2003) Surf. Coat. Tech. 174 5 - 8
  • R. Tschiersch et. al. (2014) J. Phys. D: Appl. Phys. (101839.R1)
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SLIDE 15

1 Introduction & Motivation 2 Set-up & Diagnostics 4 Summary & Outlook

3.1 Barrier discharge in He/N2 3.2 Barrier discharge in He/O2

Outline

3 Selected Results

  • R. Tschiersch

4th Graduate Summer Institute, July 31 – August 8, 2014

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SLIDE 16

Selected Results

  • R. Tschiersch

4th Graduate Summer Institute, July 31 – August 8, 2014 10/13

Barrier discharge in He/O2

  • L. Dosoudilová et. al. (in preparation)
  • R. Tschiersch et. al. (2014) HAKONE XIV (contrib. paper)
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SLIDE 17

Selected Results

  • R. Tschiersch

4th Graduate Summer Institute, July 31 – August 8, 2014 10/13

Barrier discharge in He/O2

  • L. Dosoudilová et. al. (in preparation)
  • R. Tschiersch et. al. (2014) HAKONE XIV (contrib. paper)
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SLIDE 18

Selected Results

  • R. Tschiersch

4th Graduate Summer Institute, July 31 – August 8, 2014 10/13

Barrier discharge in He/O2

  • L. Dosoudilová et. al. (in preparation)
  • R. Tschiersch et. al. (2014) HAKONE XIV (contrib. paper)
  • B. Eliasson et. al. (1994) Pure & Appl. Chem. 66

r ∝ 1 n⋅d(α − η)/d(E/n)

radius of MDs

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SLIDE 19

Selected Results

  • R. Tschiersch

4th Graduate Summer Institute, July 31 – August 8, 2014 11/13

Barrier discharge in He/O2

  • G. Myers et. al. (1977) J. Chem. Phys. 67 3352 - 59
  • L. Dosoudilová et. al. (in preparation)

He I

He

(*) + e → He *+ e

N2

+ FNS

N2( X )+ He

m/ He2 m → N2 +(B)+ e+ He/ 2He

N2( X )+ He

+/He2 + → N2 +(B)+ e + He m/He2 m

Influence of oxygen admixture

O2 + He

m/He2 m → O2 + + e+ He/ 2He

O2 + He

+/He2 + → O2 + + e + He m/He2 m

O2

+ + e → O * + O *

O2

+ + O

  • → O2 + O

*

O2 + e → O

* + O

  • / O

*+ O * + e

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SLIDE 20

Selected Results

  • R. Tschiersch

4th Graduate Summer Institute, July 31 – August 8, 2014 12/13

Barrier discharge in He/O2

  • L. Dosoudilová et. al. (in preparation)
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SLIDE 21

1 Introduction & Motivation 2 Set-up & Diagnostics 4 Summary & Outlook

3.1 Barrier discharge in He/N2 3.2 Barrier discharge in He/O2

Outline

3 Selected Results

  • R. Tschiersch

4th Graduate Summer Institute, July 31 – August 8, 2014

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SLIDE 22
  • R. Tschiersch

4th Graduate Summer Institute, July 31 – August 8, 2014 13/13

Summary & Outlook

Formation of diffuse and filamentary BDs in He/N2 and He/O2

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SLIDE 23
  • R. Tschiersch

4th Graduate Summer Institute, July 31 – August 8, 2014 13/13

Summary & Outlook

Influence of metastables on plasma chemistry and discharge mode Formation of diffuse and filamentary BDs in He/N2 and He/O2

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SLIDE 24
  • R. Tschiersch

4th Graduate Summer Institute, July 31 – August 8, 2014 13/13

Summary & Outlook

Formation of diffuse and filamentary BDs in He/N2 and He/O2 Influence of metastables on plasma chemistry and discharge mode Correlation between emission development and discharge current

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SLIDE 25
  • R. Tschiersch

4th Graduate Summer Institute, July 31 – August 8, 2014 13/13

Summary & Outlook

Formation of diffuse and filamentary BDs in He/N2 and He/O2 Influence of metastables on plasma chemistry and discharge mode Correlation between emission development and discharge current