Author/Authors :
Geraud، نويسنده , , Alain and Dentan، نويسنده , , M. and Whitehead، نويسنده , , A. and Butcher، نويسنده , , P. and Communal، نويسنده , , D. and Faisse، نويسنده , , F. and Gedney، نويسنده , , J. and Gros، نويسنده , , G. and Guillaume، نويسنده , , John D. and Hackett، نويسنده , , L. and Hennion، نويسنده , , V. and Homfray، نويسنده , , D. and Lucock، نويسنده , , R. and McKivitt، نويسنده , , J. and Sibbald، نويسنده , , M. and Portafaix، نويسنده , , Patrيcia C. and Perin، نويسنده , , J.P. and Reade، نويسنده , , M. and Sands، نويسنده , , D. and Saille، نويسنده , , A. and Symonds، نويسنده , , I. and M.Watson and Worth، نويسنده , , L. and Vinyar، نويسنده , , I.، نويسنده ,
Abstract :
A new deuterium ice pellet injector is in preparation for JET. It is designed to inject both small pellets (variable volume within 1–2 mm3) at high frequency (up to 60 Hz) for ELM mitigation experiments and large pellets (volume within 35–70 mm3) at moderate frequency (up to 15 Hz) for plasma fuelling. It is based on the screw extruder technology developed by PELIN and pneumatic acceleration. An injection line will connect the injector to the flight tubes already in place to convey the pellets toward the plasma either from the low field side or from the high field side of the torus. This injection line enables: (i) the pumping of the propellant gas, (ii) the provision of the vacuum interface with the torus and (iii) the selection of the flight tube to be used via a fast selector. All the interfaces have been designed and a prototype injector is being built, to demonstrate that the required performance is achievable.
