RF Choke for Use in a Mass Spectrometer and RF Choke

A mass spectrometer, comprising:

• a vacuum chamber,
• at least one ion optic element disposed in said vacuum chamber,
• a DC voltage source positioned external to said vacuum chamber and electrically coupled to said ion optic element for application of a DC voltage thereto,
• an RF voltage source positioned external to said vacuum chamber and electrically coupled to said ion optic for application of an RF voltage thereto, and
• an RF choke positioned in said vacuum chamber and electrically connected between said DC voltage source and said RF voltage source,
• said RF choke comprising:
• a bobbin having a hollow channel,
• a plurality of windings wrapped around the bobbin, each of said windings exhibiting a lattice winding pattern,
• a magnetic core disposed in said hollow channel of the bobbin,
• wherein said RF choke exhibits an impedance in a range of about 15 Mohm to about 150 Mohm for RF frequencies generated by said RF voltage source in a range of about 500 KHz to about 3 MHz, and a power dissipation equal to or less than about 3 W for a peak-to-peak RF voltage of said RF voltage source of at least about 1 kV.