Floating Magnet For A Mass Spectrometer

An electromagnet assembly for secondary ion mass spectrometer, said assembly comprising:

• one yoke;
• two pole pieces;
• the pole pieces being comprised in a vacuum chamber and being separated from each other by a pole piece gap defining a passage for the charged particles to be deflected;
• the yoke bridging the two pole pieces, and defining a magnetic circuit;
• and
• one electrical circuit for generating a magnetic flux in the magnetic circuit;
• wherein the pole pieces are electrically insulated from the electrical circuit and from the yoke by a first electrical insulating element and are electrically insulated from the vacuum chamber.

A secondary ion mass spectrometer comprising an electromagnet assembly for secondary ion mass spectrometer, said assembly comprising

• one yoke;
• two pole pieces;
• the pole pieces being comprised in a vacuum chamber and being separated from each other by a pole piece gap defining a passage for the charged particles to be deflected;
• the yoke bridging the two pole pieces, thus defining a magnetic circuit;
• and
• one electrical circuit for generating a magnetic flux in the magnetic circuit;
• wherein the pole pieces are electrically insulated from the electrical circuit and from the yoke by a first electrical insulating element and are electrically insulated from the vacuum chamber.