Blower Gun
Blower Gun Set-up:
Injector set up and blower gun scheme
The blower gun was first developped for the ASDEX Upgrade. It will now be adapted for the Wendelstein 7-X. As reference scenario, cylindrical pellets (D=2mm and L=2mm) would be injected with an estimated speed of 300m/s.
Setting up of the Blower gun
Setting up of the Blower gun
Table with all feasible dimensions of blower gun pellets. Technical analysis of current launcher set up by W. Weisbart/ J. Blanco Acebes
Step 1: The deuterium ice rod is extruded in the extrusion cryostat. The ice rod is stored in a storage cryostat. Pellet 1 is cut by the moving shuttle from the ice rod (see picture below). The ice rod is fed into a step hole which defines the length of the pellet. The step motor moves the ice rod 0,5 mm per step while feeding.
Step 2: Pellet 1 is shifted into the shot position. Meanwhile, pellet 2 is put into the shuttle. Pellet 1 is then accelerated by a gas pulse.
Step 3: Pellet 2 is shifted to the second shot position and accelerated by a gas pulse.
Pellet injection