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The ion temperature gradient driven instability, or r_ mode, is studied for discharges with hydrogen, deuterium or tritium in a toroidal magnetic configuration. Impurity effects on the mode and the instability which is driven by the presence of impurity ions (impurity modes) are studied as well. It is found that the maximum growth rate of the _ mode scales as M-] for pure hydrogen, deuterium or tritium discharges, where M is the mass of the working gas ion. With the inclusion of impurity ionsdoi:10.2172/10154987 fatcat:y2tew4f2sbe5hibujq726n4xce