High voltage nanosecond pulser with variable pulse width and pulse repetition frequency

A nanosecond pulser comprising:

• a first switch circuit;
• a first transformer core;
• a first primary winding electrically coupled with the first switch circuit and wrapped at least partially around the first transformer core;
• a second switch circuit;
• a second transformer core disposed adjacent to the first transformer core;
• a second primary winding electrically coupled with the second switch circuit and wrapped at least partially around the second transformer core;
• a secondary winding wrapped around the first transformer core and the second transformer core;
• and
• an output coupled with the secondary winding, configured to output electrical pulses having an output pulse width that is variable and proportional to an input pulse width.

A nanosecond pulser comprising:

• one or more switch circuits including one or more solid state switches;
• a fast capacitor disposed in series with the switch circuit;
• a transformer comprising:
• a first transformer core;
• a first primary winding wound at least partially around a portion of the first transformer core, each of the one or more switch circuits are coupled with at least a portion of the first primary winding;
• and
• a secondary winding wound at least partially around a portion of the first transformer core;
• and
• an output electrically coupled with the secondary winding that outputs electrical pulses having a peak voltage greater than about 1 kilovolt and a rise time of less than about 100 nanoseconds, wherein the electrical pulses have an output pulse width that is variable and proportional to an input pulse width.