Investigation of heat transfer from current-carrying point contact to cryogenic liquid

✍ Scribed by V.V. Andrievskii; Yu.F. Komnik; S.V. Rozhok

• Book ID: 104112481
• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 329 KB
• Volume: 34
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/s0011-2275(05)80089-x

✦ Synopsis

It is shown here that there is a possibility of studying the heat transfer from a current-carrying point contact to a cryogenic liquid through investigation of the electron-phonon relaxation in the point contact. The character of the relaxation processes in the point contact was controlled using cyclotron spectroscopy of the electron-phonon interaction. Three types of heat transfer to cryogenic liquidconvection, nucleate boiling or film boiling -were observed depending on the power in the region of the current-carrying point contact. The dependences of the degree of non-equilibrium of the injected electrons upon the injection current and the bath temperature are described. Quantitative estimates of the overheating temperature of the point contact are given.

(where r H is the Larmour radius, L is the distance between the contacts), reach the collector along the cyclotron trajectories and form the potential Uc(H ) on it, which directly accounts for the energy distribution of the non-equilibrium electrons. In this way the character of the relaxation processes in the current-carrying point contact may be studied. This method was called the cyclotron spectroscopy of the electron-phonon interaction in point-contacts. The changes in the electron relaxation processes occurring in the emitter would correspondingly entail changes in the structure of the electron-phonon interaction spectrum taken on the collector. We used this fact while studying the influence of the temperature and conditions of the heat transfer from the current-carrying point contact upon the relaxation processes in it.