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increasing voltage from 1kV voltage of 1 GV?
It is possible in proton proton fusionreplace the temperature of a magnetic field frequency of about 1 GHz plasmi and increases the density of an increasing voltage from 1kV voltage of 1 GV?
Proton-proton fusion is not an expected route to hydrogen fusion on Earth...
the OP wants to know if two protons can be fused together, presumably creating a stable nuclei in the process
Fusion of 2 protons to produce a Helium nucleus with 2 protons (2He) takes a very high temperature. This nucleus is fairly stable (comparable to Uranium), but its formation releases a relatively small amount of energy.
To release a larger amount of energy (such as for a space rocket engine), you need to fuse 4 protons into 2 protons & 2 neutrons (4He=an Alpha particle), which is the nucleus of the familiar Helium atom. This occurs through the decay of 2He into 2H=Deuterium, which is the rate-limiting step, with a half-life of a billion years or so.
the beta-plus decay of the diproton to deuterium is extremely rare (the vast majority of the time, the diproton decays back into hydrogen-1 through proton emission). The half-life of a proton in the core of the Sun before it is involved in a successful p-p fusion is estimated to be a billion years, even at the extreme density and temperatures found there.