| 单词 |
klystron |
| 释义 |
klystron Electronics.|ˈklaɪstrɒn|
Also Klystron (now rare).
[f. Gr. κλύζειν (stem κλυσ-) to wash or break over + -tron.]
An electron tube for amplifying or generating microwave signals in which a beam of electrons from a thermionic cathode is passed through a gap in a cavity resonator across which is applied a high-frequency voltage, so that the electrons collect into bunches and on reaching a second gap induce a (larger) high-frequency voltage across it. Freq. attrib., as klystron oscillator, klystron tube.
1939R. H. & S. F. Varian in Jrnl. Appl. Physics X. 324/1 Such an apparatus we call a ‘klystron’, from the Greek verb ‘klyzo’, expressing the breaking of waves on a beach. 1945H. D. Smyth Gen. Acct. Devel. Atomic Energy Mil. Purposes xi. 118 The varying electric field..introduces small, periodic variations in ion velocity, and has the effect of causing the ions to ‘bunch’ at a certain distance down the tube. (This same principle is used in the klystron high-frequency oscillator...) 1959G. Troup Masers i. 1 In conventional microwave amplifiers and oscillators such as the Klystron, an alternating electromagnetic field interacts with elementary particles, electrons, by virtue of their charge. 1959New Scientist 19 Nov. 982/3 The Jodrell radar pulses originated in a big ultra-high-frequency valve of the type known as a klystron. 1964Listener 16 Apr. 626 (Advt.), EEV 25 kW klystrons are being supplied to the British Broadcasting Corporation for use in the new UHF television transmitters. 1973Sci. Amer. Sept. 74/3 The microwaves are produced by a pair of 30-kilowatt klystron tubes powered by a diesel generator. |
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