Ultra low noise floated high voltage supply for mass spectrometer ion detector

A mass spectrometer, comprising:

• a mass analyzer,
• an ion detector disposed downstream of said mass analyzer, and
• a high-voltage power supply system configured to apply a high voltage to said ion detector,
• wherein said high-voltage power supply system comprises:
• a ground-referenced power supply having a first transformer comprising a primary winding and a secondary winding, said primary winding being electrically coupled to a first source of AC power,
• a floated bias voltage power supply having a second transformer comprising a primary winding and a secondary winding, said primary winding of said second transformer being electrically coupled to a second source of AC power,
• wherein a return electrical path of said floated bias voltage power supply is electrically coupled to said ground-referenced power supply so as to bias an output voltage of said ground-referenced power supply,
• a floating shield disposed around said floating bias power supply, and
• at least one resistive element disposed in said return electrical path of said floated bias voltage power supply to reduce noise coupled from said floated bias voltage power supply to said ground-referenced power supply.