B WEYSSOW 2009 Coordinated research activities under European Fusion Development Agreement (addressing fuelling) Boris Weyssow EFDA-CSU Garching ITPA 2009.

B WEYSSOW 2009

Coordinated research activities Coordinated research activities under under

EEuropean uropean FFusion usion DDevelopment evelopment AAgreement greement

(addressing fuelling)(addressing fuelling)

Boris Weyssow

EFDA-CSU Garching

ITPA

2009

B WEYSSOW 2009

• Collective use of JET

•Reinforced coordination of physics and technology in EU laboratories

• Training

•EU contributions to international collaborations outside F4E

All EU Laboratories/Institutions working on Fusion are parties to EFDA

EFDAEFDA

B WEYSSOW 2009

EFDA Task Forces & Topical GroupsEFDA Task Forces & Topical Groups

Task Forces under EFDA

- Plasma Wall Interaction (PWI)

- Integrated Tokamak Modelling (ITM)

Topical Groups under EFDA

- Transport Topical Group

- H&CD Topical Group (+ fuelling technology)

- Diagnostics Topical Group

- MHD Topical Group

Coordination of R&D Coordination of R&D

B WEYSSOW 2009

“Fuelling/Pumping or Particle Control”

Transversal activity across TG and TF

Weyssow 2009

– Ensure sufficient fuel (D+T) in the core• Pellets (ITM modules planned for 2009 + Transport + Diag)

– Ensure that the core is hot enough• NBI, ICRH, ECRH (ITM modules in 2009/2010 + HCD)

– Ensure sufficient exhaust of ash (He)• Edge codes (ITM [coupling planned 2010] + PWI + Transport)

– Ensure sufficient upstream separatrix density so that divertor heat loads are controlled and that target erosion made small enough• Edge codes (ITM [coupling planned 2010] + PWI + Transport)

– Probably also need to puff radiating impurities• Core impurities (ITM modules planned for 2009 )• Edge impurities (ITM [coupling planned 2010])

– Ensure density in front of ICRH and LH antennas sufficient• ITM [fully coupled in 2010] + HCD

Burn and Particle Control

B WEYSSOW 2009

Particle control: ITER requirementsParticle control: ITER requirements

- Proper fuelling is essential for all aspects of ITER plasma operation

- High DT throughput (factor ~ 300 higher than burn-out) is unattractive for the fusion reactor [huge T plant; T availability]

- More studies are needed to confirm or improve estimates on fuelling throughput

- e.g. wall absorption/outgassing on the particle control in ITER needs to be analysed

Kukushkin (Garching, 2009)

B WEYSSOW 2009

Radiative cooling mandatory in W-AUG

In ITER: much slower seed impurity removal thus quick radiation rise

Global flow chart of the divertorWith all the leak paths

Intervac Modelling for cryopump design and calculation of pumping efficiency per species

Divertor heat load and particle control

Ex: Constraints on particle control resulting from ITER slow pumping speed? – Also for glow discharges and RF conditioning

Weyssow 2009

Pellets

Also better model for pellet penetration, ablation and transport is needed.

Weyssow 2009

1- Pellet fuelling experiments to validate ITER scenarios. Assist in pellet fuelling database for extrapolation to ITER

2- Modelling of pellet physics: drift, dispersion and evaporation in particular in the pedestal, as well as impact on the plasma such as the L-H power threshold, ELM triggering.

3- Reinforced activity on integration of particle control in ITER plasma scenarios simulations:

- Analysis of the consequences of slow ITER pumping rate on wall conditioning (GDC and RF) and on scenarios (compatibility with radiative divertor).

- Predictive modelling for gas flow coupling the divertor, pumping, and duct systems (also for DEMO) (detailing leaks -> pumping efficiency per species).

EFDA WP Programme 2010: Fuelling physics