Possibilities for Energy Transport into a Radio-Frequency Quadrupole by a Shifted Supersonic Gas Jet. Part II. Accumulation and Heating of Ions

The aim of this work was the assessment of the ability of a supersonic jet to accumulate sufficiently dense ion clouds inside the quadrupole, the ion cloud being “heated” to a relatively high temperature under a relatively low density of the residual gas (pressure lower than 10–4 Torr). Kinetic measurements gave an estimate of the number of accumulated ions at the beginning of the quadrupole of about 2 × 107 and their internal temperature of 6000 K.