Fast Gas Inlet Valve insensitive to Magnetic Fields

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The object of the invention is to provide a fast gas  inlet  valve,  primarily  for  emergency  situations,  fitted  inside  a  magnetic  field device,  but  not  sensitive  to  the  magnetic  field. This device was originally  developed for use  within  the  nuclear  fusion  domain,  but  is  also  available  for  use  in  other  domains  with similar demanding  environments.

Description of the technology

When installing a gas inlet valve in a fusion reactor, it must be mounted within the magnetic field configuration to achieve rapid injection of gas, which demands short gas  lines.  The  injected  gases  are  usually  noble  gases  in  the  case  of  a  fusion  experiment.  However  such  fast  gas  inlet  valves  may  also  be  used  for  injection  of  other gases such as reactive gases. The valve is capable of injecting large volumes of gas in the order of up to several mbarL within very short times such as within less than  10  milliseconds.  This  is  achieved  even  inside  a  strong  electromagnetic  environment.
The device includes a valve body with a refilling cavity formed in it and sealed off by a  slide  from  a  valve  aperture.  The  valve  body  also  contains  a  return  cavity,  an  induction  coil  to  move  the  slide  from  valve-­‐closed  to  valve-­‐open  position  and  a  separating slide to separate the refilling volume to be injected.

Innovation and advantages of the offer

The  requirements  of  injecting  large  volumes  of  gas  in  the  order  of  up  to  several  mbarL within very short times such as within less than 10 milliseconds inside a strong electromagnetic  environment  cannot  be  met  by  conventional  electromagnetic,  piezoelectric or pneumatic valves.

Non fusion applications

Beside  the  actual  application  domain  –  heavy  electromagnetic  environments  in  nuclear  fusion  -­‐  this  device  will  also  be  of  use  in  any  domain  where  similar  environments exist and where high volumes of gas (noble or reactive) will have to be injected within short periods of time. Applications could be in the space propulsion domain (but limited to test facilities on ground due to the weight of the valves) as well as for accelerators in a suprap conductive environment. 

Fusion Heritage

The method was developed and patented at the Forschungszentrum Jülich for use in the  nuclear  fusion  domain,  in  particular  for  future  use  in  the  ITER  facility  for  disruption mitigation via massive gas injection.

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