A method of refrigeration using thermal-field electron emission from nanoscale emitters of arbitrary work function in a vacuum crossed-field gap is proposed. With an external crossed magnetic field, an additional potential barrier near the anode is created to restrict the tunneling of low-energy electrons (below the Fermi energy) and thus provids a versatile cooling capability from 300 down to . Optimal conditions are determined numerically and analytically, which give local cooling power densities (per emitter) of about (at ), (at ), and (at ).
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