The influence of a nonuniform electric field on the swarmparameters in SF6 has been studied using the Monte Carlosimulation technique in which the motion of electrons is traced. Twofield configurations in which the electrons move have been studied:increasing and decreasing electric fields. The spatial variations of theelectron mean energy, drift velocity, ionization, and attachmentcoefficients are calculated for different field slopes and compared withthe equilibrium values obtained under uniform field conditions. Theresults show that α/N is lower than the equilibrium value forincreasing field and is higher for decreasing field with the relaxationrate depending on the field slope. The mean energy and drift velocityare almost the same as equilibrium values, while the attachmentcoefficients show a significant nonequilibrium feature
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