1 / 12

The WEST project and related activities at CEA-IRFM

The WEST project and related activities at CEA-IRFM. R. Guirlet, J. Bucalossi, M. Firdaouss, Y. Marandet, O. Meyer, R. Sabot. 24/09/2012 ADAS workshop. Layout. The WEST project: a test bench for ITER CFPs  Motivation and assets  Diagnostics for W sources and core density

greta
Download Presentation

The WEST project and related activities at CEA-IRFM

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The WEST project and related activities at CEA-IRFM R. Guirlet, J. Bucalossi, M. Firdaouss, Y. Marandet, O. Meyer, R. Sabot 24/09/2012 ADAS workshop CEA | 10 AVRIL 2012

  2. 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 ADAS workshop - 24-25 sept. 2012

  3. 1. The WEST project (1/4) - Motivation  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 Assets Superconducting toroidal coils Non-inductive plasma current generation Actively cooled PFCs Integrated real time control The WEST project, CEA/IRFM project report, J. Bucalossi et al., 2011 ADAS workshop - 24-25 sept. 2012

  4. 1. The WEST project (2/4) - Fluxes and fluences Modelled heat fluxes and particle fluences comparable to expected ITER fluxes  IP = 0.6 - 0.8 MA  BT = 3.7 T  ne = 4-91019 m-3  Padd = 10-15 MW Heat flux (MW/m2) Courtesy M. Firdaouss q = 5 mm q = 10 mm q = 15 mm Abscissa along lower divertor plate (m)  Heat fluxes on div. plates :  10 - 30 MW/m2(depends on scenario)  Fluences: 1 ITERpulse  2-100 WEST exp. days ADAS workshop - 24-25 sept. 2012

  5. 1. The WEST project (3/4) - W Diagnostics 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 ADAS workshop - 24-25 sept. 2012

  6. 1. The WEST project (4/4) - Schedule  (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. ADAS workshop - 24-25 sept. 2012

  7. 2. WEST-oriented Activities(1/3) - Scenario •  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 PNBI, PECRH H98 ELMs (H) Prad - 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 ADAS workshop - 24-25 sept. 2012

  8. 2. WEST-oriented Activities(2/3) - W spectroscopy and SOL study  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 O. Meyer, accepted in JNM  GIS will investigate up to 1000 Å with 150 gr/mm grating ADAS workshop - 24-25 sept. 2012

  9. CW ΔrLCFS (mm) 2. WEST-oriented Activities(2/3) - W spectroscopy and SOL study  W screening in the SOL  'Pepper-shaker' on reciprocating shaft (probe) Injections at a controlled radius Reservoir of solid W(CO)6 Pepper shaker cW Reservoir of W(CO)6 gas 2 10-4 LBO Spring M. Kocan, accepted in RSI 0 O. Meyer, accepted in JNM 100 20 Langmuir probes (local jsat, M//, Te, Vfl) Number of atoms and injection location controlled W penetration  when injection radius , saturates close to LCFS?  First step toward SOL transport study ADAS workshop - 24-25 sept. 2012

  10. 2. WEST-oriented Activities(3/3) - studies of more general interest  Impurity behaviour in sawtooth cycles Before crash After crash Persistent structure indicates incomplete particle exhaust T. Nicolas, TH/P3-21, IAEA 2012  3D modelling (XTOR) - Experiment: space and time resolution: 1 cm - 40 s ?  He jet spectroscopy for ne, Te measts  Fast SXR analysis See D. Vézinet in diagnostics session  Ar CX data comparison See R. Dux in CX session ADAS workshop - 24-25 sept. 2012

  11. Summary - conclusion  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. ADAS workshop - 24-25 sept. 2012

  12. Commissariat à l’énergie atomique et aux énergies alternatives Centre de Cadarache| 13108 Saint Paul Lez Durance Cedex T. +33 (0)4 42 25 46 59 | F. +33 (0)4 42 25 64 21 Etablissement public à caractère industriel et commercial | RCS Paris B 775 685 019 DSM IRFM CEA | 10 AVRIL 2012

More Related