THE WEST PROJECT AND RELATED ACTIVITIES AT CEA-IRFM

24/09/2012 ADAS WORKSHOP

| PAGE 1CEA | 10 AVRIL 2012

R. Guirlet, J. Bucalossi, M. Firdaouss, Y. Marandet, O.

Meyer, R. Sabot

LAYOUT

The WEST project: a test bench for ITER CFPs Motivation and assets Diagnostics for W sources and core density Schedule and costs

Current physics activities : mostly focussed on WEST WEST-like plasmas in AUG W spectroscopy in Tore Supra Impurity transport Studies of broader interest

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1. THE WEST PROJECT (1/4) - MOTIVATION

| PAGE 3ADAS workshop - 24-25 sept. 2012

Assets Superconducting toroidal coils Non-inductive plasma current generation Actively cooled PFCs Integrated real time control

Programme W actively cooled Plasma Facing Component testing Extending high confinement regimes towards steady states Exploring PWI with a W actively cooled environment Contributing to the fusion science programme

The WEST project, CEA/IRFM project report, J. Bucalossi et al., 2011

1. THE WEST PROJECT (2/4) - FLUXES AND FLUENCES

| PAGE 4ADAS workshop - 24-25 sept. 2012

Modelled heat fluxes and particle fluences comparable to expected ITER fluxes

IP = 0.6 - 0.8 MA BT = 3.7 T ne = 4-91019 m-3 Padd = 10-15 MW

Heat flux(MW/m2)

Abscissa along lower divertor plate (m)

Heat fluxes on div. plates : 10 - 30 MW/m2 (depends on scenario) Fluences: 1 ITER pulse 2-100 WEST exp. days

Courtesy M. Firdaouss

q = 5 mm

q = 10 mm

q = 15 mm

1. THE WEST PROJECT (3/4) - W DIAGNOSTICS

| PAGE 5ADAS workshop - 24-25 sept. 2012

W sources: monitor all sources if possible

Optical fibers (200) : endoscopes and in situ Spatial resolution : 1 cm (lower div.) - 10 cm (ant.) 'Multiplexer' to spectrometers (20 views/spectrom.) Reflection on metallic walls!

W in the core (and other elements)

2 GIS (Schwob-Fraenkel) 1 scanning view on lower plasma half (lower div.) 1 horizontal view Both included in real time control system

SPRED ?

2D crystal spectrometer

1. THE WEST PROJECT (4/4) - SCHEDULE

| PAGE 6ADAS workshop - 24-25 sept. 2012

(If) ITER goes for a full W divertor, WEST will contribute to risk minimization for the full W divertor manufacturing and operation

Total cost: 20-25 M€ (vis. spectroscopy: 400 k€), to be funded by CEA, Federation of French fusion labs, international collaborations, etc.

ELMs(H)

H98

PNBI, PECRH

Prad

2. WEST-ORIENTED ACTIVITIES(1/3) - SCENARIO

| PAGE 7ADAS workshop - 24-25 sept. 2012

Unknowns and risks: X-point close to plate H mode threshold ?

H mode sustainable (impurity flux through separatrix)? Divertor plasma ?

'WEST-like' experiment in AUG

- Confinement as in standard configuration- L-H threshold extrapolated to WEST : 3.2 MW- cW 10-4 in the core even with low ECRH

Further study planned (related to IO): - upper X point (flux on target, W measts) - ICRH as main heating method

2. WEST-ORIENTED ACTIVITIES(2/3) - W SPECTROSCOPY AND SOL STUDY

| PAGE 8ADAS workshop - 24-25 sept. 2012

W spectral features with GIS (Schwob-Fraenkel)

W27+-W35+ quasi continuum, 45-65 Å (600 gr/mm) W44+, W45+ (600gr/mm)

before W injection

after W injection

GIS will investigate up to 1000 Å with 150 gr/mm grating

O. Meyer, accepted in JNM

2. WEST-ORIENTED ACTIVITIES(2/3) - W SPECTROSCOPY AND SOL STUDY

| PAGE 9ADAS workshop - 24-25 sept. 2012

W screening in the SOL 'Pepper-shaker' on reciprocating shaft (probe)

Injections at a controlled radius

Spring

Reservoir of solid W(CO)6

Reservoir of

W(CO)6 gas

Langmuir probes (local jsat, M//, Te, Vfl)

ΔrLCFS (mm)

CW

LBO

Pepper shakercW

1000

2 10-4

20

Number of atoms and injection location controlledW penetration when injection radius , saturates close to LCFS? First step toward SOL transport study

M. Kocan, accepted in RSIO. Meyer, accepted in JNM

2. WEST-ORIENTED ACTIVITIES(3/3) - STUDIES OF MORE GENERAL INTEREST

| PAGE 10ADAS workshop - 24-25 sept. 2012

Impurity behaviour in sawtooth cycles

He jet spectroscopy for ne, Te measts Fast SXR analysis

See D. Vézinet in diagnostics session

Ar CX data comparisonSee R. Dux in CX session

Before crash After crash

Persistent structure indicates incompleteparticle exhaust

3D modelling (XTOR) - Experiment: space and time resolution: 1 cm - 40 s ?

T. Nicolas, TH/P3-21, IAEA 2012

SUMMARY - CONCLUSION

| PAGE 11ADAS workshop - 24-25 sept. 2012

Effort concentrated on the WEST project Development of visible and soft-X ray spectroscopy diagnostics W spectroscopy for source and transport studies Real time control based on impurity measurements Experiments on W-wall machines (AUG, JET) to develop long pulse scenarios

Pursue investigations of broader interest Impurity transport: exp/theory comparisons (electron heating)

All these subjects are studied in the frame of various collaborations - new ones are welcome.

DSM

IRFM

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CEA | 10 AVRIL 2012