Method for closing an electrical power supply circuit of an electric apparatus located in a chamber at a controlled variable pressure and related device

A method for closing an electrical power supply circuit of an electric apparatus located in a chamber at a controlled variable pressure, the electrical power supply circuit comprising an open circuit defined between two electrically conductive terminals, wherein, both electrically conductive terminals being formed on an internal wall made of an electrically insulating material of an enclosure which is open to the pressure of the chamber, the method comprises:

• a heating which provides energy to an element made of electrically conductive material located in the enclosure which is open to the chamber pressure,
• a sublimation of the element made of electrically conductive material once the element made of electrically conductive material reaches a given temperature, if pressure conditions in the chamber correspond to conditions required for an operation of the electric apparatus under vacuum,
• an ejection of vapour particles of the electrically conductive material which result from the sublimation, and
• a formation of a deposit of electrically conductive material between the two electrically conductive terminals as a consequence of the ejection of the vapour particles.