trilateral euregio cluster a.kreter, v.philipps et al "retention in w, mo and graphite samples...

Trilateral Euregio Cluster

A.Kreter, V.Philipps et al "Retention in W, Mo and graphite samples simultaneously exposed to SOL plasma in TEXTOR"

Assoziation EURATOM - Forschungszentrum Jülich

Institut für Energieforschung 4 - Plasmaphysik

1

Retention in tungsten, molybdenum and graphite samples simultaneously exposed to

SOL plasma in TEXTOR

A.Kreter, V.Philipps, S.Droste, M.Freisinger, O.Schmitz and TEXTOR team

Institut für Energieforschung - Plasmaphysik, Forschungszentrum Jülich, Association EURATOM-FZJ, Trilateral Euregio Cluster, Germany

10th ITPA committee meeting on SOL/divertor physics Avila, 7.01.2008

Trilateral Euregio Cluster

A.Kreter, V.Philipps et al "Retention in W, Mo and graphite samples simultaneously exposed to SOL plasma in TEXTOR"

Assoziation EURATOM - Forschungszentrum Jülich

Institut für Energieforschung 4 - Plasmaphysik

2

Exposure of roof-like test limiter with stripesResults and comparison with available databaseLimiter with CFC and graphite

59mm

30 o

60m mtoroidal d irectionpoloidal direction

r=a=460m m

r=461.5m m

r=490m m

r

NB

31

DM

S780

EK98

32 reproducible Ohmic discharges in 80% D

177 s total duration

Limiter tip at LCFS (0.46 m)

neLCFS 1·1019 m-3 ; Te

LCFS 45 eV; Ti Te

LCFS 2.9·1025 D/m2; SOL() 12 mm

Tlim 500 K

EK98DMS780NB31

EK98DMS780NB31

J . R o th , J . N uc l. M a te r. (20 07) 8 22e t a l. 36 3–3 65

Similar retention for both CFCs and graphite

Similar retention to CFC N11 exposed in PISCES-A

Trilateral Euregio Cluster

A.Kreter, V.Philipps et al "Retention in W, Mo and graphite samples simultaneously exposed to SOL plasma in TEXTOR"

Assoziation EURATOM - Forschungszentrum Jülich

Institut für Energieforschung 4 - Plasmaphysik

3

200 400 600 800 1000 1200 14000

1x1018

2x1018

3x1018

4x1018

5x1018

6x1018

7x1018

8x1018

EK98 Mo W

Temperature [K]

Ou

tgas

sin

g r

ate

[D/m

2 s]

Exposure of roof-like test limiter with stripes

Castellated test limiter in TEXTOR

NB

31D

MS

780

EK

98

NB31

DMS780

EK98

Double roof limiter

EK98

EK98

Mo

W

Mo

W

WMo

C

Samples with highest fluence analysed by TDS

Results of TDS

Similar retention in EK98, Mo and W of ~ 1021 D/m2

EK98 Mo W0.0

5.0x1020

1.0x1021

1.5x1021

Ret

enti

on

[D

/m2 ]

Trilateral Euregio Cluster

A.Kreter, V.Philipps et al "Retention in W, Mo and graphite samples simultaneously exposed to SOL plasma in TEXTOR"

Assoziation EURATOM - Forschungszentrum Jülich

Institut für Energieforschung 4 - Plasmaphysik

4

0 2x1025 4x1025 6x1025 8x1025 1x10260

1x1021

2x1021

3x1021

4x1021

5x1021

6x1021

7x1021

8x1021

Re

ten

tio

n [

D/m

2 ]

Incident fluence [D/m2]

N11 PISCES NB31 DMS780 EK98 EK98 new Mo W

Comparison with available data

PISCES-A, old and new TEXTOR data Lab data by O.Ogorodnikova200 eV beam, 380-470 K

1021 1022 1x1023 1024 1x10251018

1019

1020

1021

200 eV, 380-470 K

200 eV, RT100%

Deu

teri

um re

tain

ed, D

/m2

Incident fluence, D+/m2

New TEXTOR W datapoint

Data fit reasonable with available database

Trilateral Euregio Cluster

A.Kreter, V.Philipps et al "Retention in W, Mo and graphite samples simultaneously exposed to SOL plasma in TEXTOR"

Assoziation EURATOM - Forschungszentrum Jülich

Institut für Energieforschung 4 - Plasmaphysik

5

Summary

• Graphite, Mo and W samples simultaneously exposed in TEXTOR for fluences of 1.6·1025 D/m2 at T=500 K

• Similar retention in the samples of ~ 1021 D/m2