Photonic T removal techniques in the EU G Counsell 1, P Coad 1, C Grisolia 2, A. Semerok 3, A Widdowson 1 1 EURATOM/UKAEA Fusion Association, Culham Science.

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Presentation transcript:

Photonic T removal techniques in the EU G Counsell 1, P Coad 1, C Grisolia 2, A. Semerok 3, A Widdowson 1 1 EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, OX14 3DB, UK 2 Association EURATOM-CEA, CEA/DSM/DRFC Cadarache, St.Paul lez Durance, France 3 Max-Planck-Institut für Plasmaphysik, EURATOM Association, D Garching, Germany

2/23 T-removal through ‘photonic cleaning’ aC:H co-deposits have poor thermal conductivity compared to substrates (CFC, Be, W) Surface heat flux leads to rapid temperature rise in co-deposit  ablation or chemical ‘bond-breaking’ Two ‘photonic cleaning’ schemes under investigation:  LASER  Flash-lamp Requires vessel access, but can operate in high magnetic fields and in vacuuo, inert gas or atmospheric conditions Studies on-going in both laboratory and tokamak environments and both laboratory produced and tokamak co-deposited films

3/23 100mm 2 in 2s with 20W Ytterbium fibre laser (1060nm, 120ns, 20kHz), 2J/cm 2 on  250  m 40cm  g T/h over 150m 2 Energy density threshold for removal Threshold factor 5 lower for co-deposit compared to graphite – selective removal No difference between active and inert gas environment Galvo-scanning fibre laser developed for JET Laser cleaning of TEXTOR tile Trials conducted in JET BeHF Co-deposit easily removed but only 10% T released  micro-particulate?

4/23 JET 2004 trial showed engineering feasibility of flash-lamp technology Flash-lamp cleaning of tritiated aC:H Trials now conducted using flash-lamp in JET berylium handling facility Aim to clean thick, tritiated co-deposit from inner divertor CFC tile  Photon flux from 500J, 140  s flash-lamp  3.6MW  Rep. rate 5Hz  Focused using semi-elliptical cavity –  Footprint ~30cm 30mm  375MWm -2, 6J/cm 2 Three positions treated (with varying co-deposit thickness and tritiation) Tritium release monitored and tile sent for SIMS/IBA/SEM analysis

5/23 1 st demonstration of T-removal Total T release ~9  g. Decreasing efficiency with number of pulses 40% of T inventory &  m co-deposit, removed (off gas & SEM)  0.075g T/h over 150m 2 Untreated Treated  7  m de-tritiation at surface of treated zone  Consistent with FE calcs of bulk heating above 700K  Build-up of Ni at surface  explanation for roll-over of tritium release/pulse? (similar results for Be on other treated tiles)