Need for atomic and molecular data for kinetic modelling of the plasma edge David Tskhakaya

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Need for atomic and molecular data for kinetic modelling of the plasma edge David Tskhakaya Association EURATOM-ÖAW, University of Innsbruck, Austria *Permanent address: Andronikashvili Institute of Physics, Tbilisi, Georgia

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Need for atomic and molecular data for kinetic modelling of the plasma edge David Tskhakaya Association EURATOM-ÖAW, University of Innsbruck, Austria *Permanent address: Andronikashvili Institute of Physics, Tbilisi, Georgia. - PowerPoint PPT Presentation

Transcript of Need for atomic and molecular data for kinetic modelling of the plasma edge David Tskhakaya

Page 1: Need for atomic and molecular data for kinetic modelling of the plasma edge David Tskhakaya

Need for atomic and molecular data

for kinetic modelling of the plasma edge

David Tskhakaya

Association EURATOM-ÖAW, University of Innsbruck, Austria

*Permanent address: Andronikashvili Institute of Physics, Tbilisi, Georgia

Page 2: Need for atomic and molecular data for kinetic modelling of the plasma edge David Tskhakaya

History of kinetic plasma simulations including AMP

D.Tskhakaya, 14th ADAS workshop, Rigberg Castle 5.10.2009 1

Birdsall IEEE Trans. Plasma Sci. 1991 ----- linear

-----------------------

Tskhakaya et al., Europhys. Conf. Abstr. 2002 Fusion linear

Matyash et al., J. Nucl. Mater. 2003 Low temp. nonlinear

Taccogna et al., J. Nucl. Mater. 2007 Fusion nonlinear

Tskhakaya et al., J. Nucl. Mater. 2007 Fusion nonlinear HPC (2009)

Vlasov codes

PIC codes

Batischev, et al., J. Plasma Phys. 1999 Fusion nonlinear

---------------------

Devaux, et al., Phys. Plasm. 2009 Fusion linear (BGK)

NkBVEm

e

dt

VdV

dt

rdk

k

kkk

k ,...,1,,

fstVrtfV

BVEm

e

rV

t sss

s

,,

Page 3: Need for atomic and molecular data for kinetic modelling of the plasma edge David Tskhakaya

Collision operators for PIC/MC

D.Tskhakaya, 14th ADAS workshop, Rigberg Castle 5.10.2009 2

Binary collision model

Choosing of collision pares

Collision of particles

Examples from BIT1 code (Tskhakaya CPP 2008)

2e + H+ = e + HH + H+ = H+ + H

e + H = 2e + H+ e + H2 = 2e + H + H+

Page 4: Need for atomic and molecular data for kinetic modelling of the plasma edge David Tskhakaya

Differential cross-sections: examples

D.Tskhakaya, 14th ADAS workshop, Rigberg Castle 5.10.2009 3

e + H = 2e + H+

,/,/

,2/sin11ln4

1

,1

ln1

11

1

1,

cos,cos,,

00

2

3

0322

0

3

EEEE

E

E

Ed

d

b

EE

aEE

dE

d

Ed

dE

d

dEE

dE

d

dddE

d

sspp

ion

ii

s

ip

spsspspsp

s

ion

ppp

ionss

s

ionsp

s

ion

pss

ion

10-3

10-2

10-1

100

0

0.5

1

1.5

2

2.5

BIT1 Krstic 1998

Angular differential cross sections

Page 5: Need for atomic and molecular data for kinetic modelling of the plasma edge David Tskhakaya

How do we implement the AMD

D.Tskhakaya, 14th ADAS workshop, Rigberg Castle 5.10.2009 4

Search for AMD

Comparison of the data from different sources

Direct implementation of the data

10-2

10-1

100

101

102

103

10-1

100

101

102

E [eV]

PhelpsJanev

Cross-sections for H2+ + H2 charge-

exchange collision from different sources.

Analytic fit functions Data tables

Par.1 Par. 2

E1 1

... ...

Computer representation

Page 6: Need for atomic and molecular data for kinetic modelling of the plasma edge David Tskhakaya

The AMD for major processes

D.Tskhakaya, 14th ADAS workshop, Rigberg Castle 5.10.2009 5

We need the differential cross-sections and not rate coefficients!

The best available data: processes involving e, H, H2

Still, there is a poor data for

Electron three-body recombination

Isotope-resolved reactions (H, D, T)

Negative ions H- and H3+

H2 detachment

Poor data for impurity

e + C(n)* colisions

e + W(n), e + Be(n) collisions (?)

reactions with CxHy

Page 7: Need for atomic and molecular data for kinetic modelling of the plasma edge David Tskhakaya

Our contribution to AMD

D.Tskhakaya, 14th ADAS workshop, Rigberg Castle 5.10.2009 6

Dedicated low temperature plasma experiments and corresponding kinetic

simulations allow to „fine tune“ the available AMD and even propose existence

of new processes (Bronold, J. Phys. D 2007 ; Matyash J. Phys. D 2007)

Double emissive layer from oxygen plasma experiment and corresponding PIC simulation. A new

dissociative excitation collision O2 + O2+ = O(3p3P) + X is responsible for the emission at x~0.

Page 8: Need for atomic and molecular data for kinetic modelling of the plasma edge David Tskhakaya

D.Tskhakaya, 14th ADAS workshop, Rigberg Castle 5.10.2009 7

Present day PIC/MC codes incorporate complex plasma-neutral interaction

models, conserving momentum and energy.

The number of implemented processes is limited mainly by the available AMD. The advanced codes accept any format for the AMD.

There is a deficit of differential cross-sections even for the major processes, such as isotope-resolved H plasma-neutral and plasma-impurity (C, Be, W,...) interaction.

How to tackle reactions with Hydrocarbons?

Thank you for your attention!

Conclusions