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Mass spectrometer system requirements

System requirements:

  • The mass spectrometer shall be able to give electrons to collide with the atoms of the introduced gas, thus obtaining ions.
  • The mass spectrometer shall be able to accelerate the ions by exposing them to high voltage.
  • The mass spectrometer shall be able to separate the ions from each other and change their path by exposing them to a magnetic field coming from the Helmholtz Coil.
  • The detector shall be able to capture the ions according to the (masse/charge) after deflection.

 

 Mechanical requirements:

  • The cathode shall be able to withstand the thermal and electrical Stress. 
  • The cathode shall be made of tungsten.
  • The anode shall be made of stainless steel.
  • The tube  shall be made of stainless steel ( ionization chamber + 2 horizontals tubes + 1 curved tube ).
  • The vacuum pump shall be able to create a vacuum in the stainless steel tube.
  • The plate, which push the ions out of the ionization chamber, shall be made of stainless steel ( slight positive charge) .
  • The three plates, which accelerate the ions, shall be made made of stainless steel.
  • The Helmholtz coil shall be made of two pieces of plastic, with iron inside, and copper strips wrapped around it.The Helmholtz coil shall be manufactured according to the mechanical design .

 

Physical requirements :

  • A plate of stainless steel ( slight positive charge) shall be able to push the ions out of the ionization chamber.
  • A three plates, made of stainless steel, shall be able to accelerate the ions.
  • The detector shall be able to capture the ions and give a signal to the computer.

 

Electrical requirements:

  • The power supply (P4) shall be able to supply 17 V to the tungsten
  • The power supply (P5) shall be able to supply a 300V to the acceleration plates.
  • The anode and all stainless steel plates shall be isolated from the tube, in order to prevent the voltage from extending and crossing the tube.

Magnetic requirements:

  • The Helmholtz coil shall be able to generate the magnetic field on the curved tube.
  • The Helmholtz coil shall be able to generate a magnetic field of 0.2T.

 

Safety requirements:

Electrical safety

  • All the electric connection shall be coated by the right isolated according to the current and the voltage passing through the connections.
  • The cables and connections of 17 V shall be isolated with...
  • The cables and connections of 300 V shall be isolated with...