Current characteristics of quasi-planar vacuum diodes with explosive-emission cathodes made of various materials at a high-voltage pulse duration of a few nanoseconds

被引：8

作者：

Afanas'ev, K. V. ^{[1
]}

Vagner, M. I. ^{[2
]}

Kutenkov, O. P. ^{[1
]}

Pegel, I. V. ^{[1
,3
]}

Pribytkov, G. A. ^{[2
]}

Rostov, V. V. ^{[1
]}

Tarakanov, V. P. ^{[4
]}

机构：

[1] Russian Acad Sci, Inst High Current Elect, Siberian Branch, Tomsk 634055, Russia

[2] Russian Acad Sci, Inst Strength Phys & Mat Sci, Siberian Branch, Tomsk, Russia

[3] Natl Res Tomsk Polytech Univ, Tomsk, Russia

[4] Russian Acad Sci, Joint Inst High Temp, Moscow, Russia

来源：

RUSSIAN PHYSICS JOURNAL | 2012年 / 55卷 / 07期

关键词：

Vacuum diode; explosive emission; composite cathode; metal-ceramic cathode; cathode plasma; high-current nanosecond electron beam;

D O I：

10.1007/s11182-012-9880-8

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The currents of 5-ns pulsed high-current electron beams produced in a planar vacuum diode with explosive-emission cathodes made of various materials with no external magnetic field at an average electric field strength in the gap of about 300 kV/cm have been measured and time-integrated observation of the optical luminescence of the cathode surface have been performed. Cathodes with a ceramic bushing and spring metal contacts, with ceramic plates set in a magnetic iron matrix, with blades made of stamped exfoliated graphite (Graflex), with blades made of foil fiberglass plastic, and a composite cathode made of crystalline boron and copper powders were tested. The current carried by one emission center has been estimated to range between 5 and 20 A for various cathodes. For the metal-dielectric cathode, the velocity of expansion of the cathode plasma over the ceramic surface has been estimated as 2 center dot 10(7) cm/s. The lifetimes of the cathodes at a pulse repetition rate of 50 Hz have been investigated.

引用

页码：772 / 780

页数：9

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