what are the latest technologies for this method of cutting?
Yes. "IGBTs", these can be generally found in high current machines where it is not possible to parallel sufficient MOSFET transistors.
Plasma cutting
In the past decade plasma torch manufacturers have engineered new models with a smaller nozzle and a thinner plasma arc. This allows near-laser precision on plasma cut edges. Several manufacturers have combined precision CNC control with these torches to allow fabricators to produce parts that require little or no finishing.

The transistors used were initially MOSFETs, but are now increasingly using IGBTs. With paralleled MOSFETs, if one of the transistors activates prematurely it can lead to a cascading failure of one quarter of the inverter. A later invention, IGBTs, are not as subject to this failure mode. IGBTs can be generally found in high current machines where it is not possible to parallel sufficient MOSFET transistors.
concept of negative resistance in context with scr UNANSWERABLE what is this resistance? In electronics, “Negative Resistance” is a property of some electrical circuits and devices in which an increase in voltage across the device's terminals results in a decrease in electric current through it. what are the different ones? In an electronic device, the differential resistance formula_14, the static resistance formula_15, or both, can be negative, so there are three categories. when was it first discovered? It was first recognized during investigations of electric arcs, which were used for lighting during the 19th century. what is this arc? An electric arc is an electrical breakdown of a gas that produces a prolonged electrical discharge. when was it discovered? Sir Humphry Davy discovered the short-pulse electrical arc in 1800. what is it used for? Industrially, they are used for welding, plasma cutting, for electrical discharge machining, as an arc lamp in movie projectors, and follow-spots in stage lighting. what is the above mentioned method of cutting? "Plasma Cutting" is a process that cuts through electrically conductive materials by means of an accelerated jet of hot plasma. what are the different methods of starting the cutting? CNC cutting tables, and some have the cutter built into the table.
wiki:17951281
Plasma cutting [SEP] New technology
In the past decade plasma torch manufacturers have engineered new models with a smaller nozzle and a thinner plasma arc. This allows near-laser precision on plasma cut edges. Several manufacturers have combined precision CNC control with these torches to allow fabricators to produce parts that require little or no finishing. The transistors used were initially MOSFETs, but are now increasingly using IGBTs. With paralleled MOSFETs, if one of the transistors activates prematurely it can lead to a cascading failure of one quarter of the inverter. A later invention, IGBTs, are not as subject to this failure mode. IGBTs can be generally found in high current machines where it is not possible to parallel sufficient MOSFET transistors.