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