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...