It's not clear to me how the excess heat gets dumped so efficiently into already hot gas that the helium becomes supercooled again. That seems to me a far more difficult trick than using cold helium to cool hot gas.
It's not clear to me how the excess heat gets dumped so efficiently into already hot gas that the helium becomes supercooled again. That seems to me a far more difficult trick than using cold helium to cool hot gas.