DE3235753C2 - - Google Patents
Info
- Publication number
- DE3235753C2 DE3235753C2 DE19823235753 DE3235753A DE3235753C2 DE 3235753 C2 DE3235753 C2 DE 3235753C2 DE 19823235753 DE19823235753 DE 19823235753 DE 3235753 A DE3235753 A DE 3235753A DE 3235753 C2 DE3235753 C2 DE 3235753C2
- Authority
- DE
- Germany
- Prior art keywords
- support rods
- traveling wave
- wave tube
- layer
- vacuum envelope
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
- H01J23/16—Circuit elements, having distributed capacitance and inductance, structurally associated with the tube and interacting with the discharge
- H01J23/24—Slow-wave structures, e.g. delay systems
- H01J23/26—Helical slow-wave structures; Adjustment therefor
- H01J23/27—Helix-derived slow-wave structures
Landscapes
- Microwave Tubes (AREA)
- Physical Vapour Deposition (AREA)
Description
Die Erfindung geht aus von einer Wanderfeldröhre nach dem Oberbegriff des Anspruches 1.The invention is based on a traveling wave tube according to the Preamble of claim 1.
Eine derartige Wanderfeldröhre ist aus der DE-PS 19 37 704 bekannt.Such a traveling wave tube is from DE-PS 19 37 704 known.
Bei solchen Hochleistungswanderfeldröhren mit wendelartiger Verzögerungsleitung besteht ab bestimmten hochfrequenten Feldstärken, die etwa 1 bis 2 kV/cm entsprechen, die Gefahr von HF-Überschlägen zwischen Wendelhalterung und Leitung, sofern ein sogenannter "multipactor effect" eintritt. Dieser Effekt besteht darin, daß aus metallischen Spitzen durch die überhöhte Feldstärke Primärelektronen herausgeschlagen werden. Die Halterungsstäbe aus dielektrischem Material haben einen Sekundärelektronenemissionsfaktor größer als 1, so daß die Primärelektronen, die durch das hochfrequente elektrische Feld über den Halterungsstab gezogen werden, als Folge der Sekundäremission lawinenartig anwachsen und eine Quasi-Belegung der Oberfläche der Halterungsstäbe bewirken. Dies führt zu einer etwa 20fachen Verminderung der natürlichen Durchschlagsfeldstärke wie oben angegeben.In such high-performance traveling wave tubes with a spiral delay line exists from certain high frequencies Field strengths that correspond to about 1 to 2 kV / cm pose the danger of HF rollovers between the spiral holder and Management if a so-called "multipactor effect" occurs. This effect is that of metallic Peaks due to the excessive field strength of primary electrons be knocked out. The support rods made of dielectric Material have a secondary electron emission factor greater than 1 so that the primary electrons that due to the high-frequency electrical field via the support rod be drawn as a result of the secondary emission grow like an avalanche and almost cover the surface of the support rods. This leads to a about a 20-fold reduction in the natural breakdown field strength as you can read above.
Der Erfindung liegt die Aufgabe zugrunde, die Gefahr von HF-Überschlägen zwischen Wendelhalterung und Verzögerungsleitung als Folge eines Multipactor-Effektes zu beseitigen. The invention has for its object the risk of HF arcing between the coil holder and the delay line as a result of a multipactor effect.
Diese Aufgabe wird durch eine Wanderfeldröhre mit den Merkmalen des Anspruches 1 gelöst. Vorteilhafte Ausgestaltungen der Erfindung sind Gegenstand zusätzlicher Ansprüche.This task is carried out by a traveling wave tube solved with the features of claim 1. Advantageous embodiments of the invention are Subject of additional claims.
Die Erfindung wird anhand eines Ausführungsbeispiels weiter erläutert. Teile, die nicht unbedingt zum Verständnis der Erfindung beitragen, sind in den Figuren unbezeichnet oder weggelassen. Es zeigt:The invention is further illustrated by an example explained. Parts that are not necessarily for understanding contribute to the invention are unmarked in the figures or left out. It shows:
Fig. 1 eine Wanderfeldröhre schematisch im Schnitt und Fig. 1 shows a traveling wave tube schematically in section and
Fig. 2 das Ausführungsbeispiel der Fig. 1 im Schnitt II-II. Fig. 2 shows the embodiment of FIG. 1 in section II-II.
Die in der Fig. 1 und Fig. 2 teilweise dargestellte Wanderfeldröhre besteht im wesentlichen aus einer metallischen Vakuumhülle 3, die eine quadratförmige Innenausnehmung 4 aufweist. Die die wendelartige Verzögerungsleitung 5 umgebenden Halterungsstäbe 1 sind in den in diesem Ausführungsbeispiel abgerundeten Kanten der quadratförmigen Innenausnehmung 4 gelagert. Die vorzugsweise aus Berylliumoxid (BeO) bestehenden Halterungsstäbe sind mit einer Schicht aus Chromoxid (Cr₂O₃) überzogen. Dies verhindert die Elektronensekundäremission aus den Halterungsstäben 1.The traveling wave tube, shown partly in Fig. 1 and Fig. 2 consists essentially of a metallic vacuum envelope 3, which has a square-shaped interior recess. 4 The support rods 1 surrounding the helical delay line 5 are supported in the rounded edges of the square-shaped inner recess 4 in this exemplary embodiment. The preferably made of beryllium oxide (BeO) support rods are coated with a layer of chromium oxide (Cr₂O₃). This prevents secondary electron emission from the support rods 1 .
Die Halterungsstäbe 1 können nach verschiedenen Verfahren, vorzugsweise mittels eines Tauchverfahrens, überzogen werden.The support rods 1 can be coated using various methods, preferably by means of a dipping method.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19823235753 DE3235753A1 (en) | 1982-09-27 | 1982-09-27 | Travelling wave tube having a helical delay line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19823235753 DE3235753A1 (en) | 1982-09-27 | 1982-09-27 | Travelling wave tube having a helical delay line |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE3235753A1 DE3235753A1 (en) | 1984-03-29 |
| DE3235753C2 true DE3235753C2 (en) | 1991-04-11 |
Family
ID=6174288
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19823235753 Granted DE3235753A1 (en) | 1982-09-27 | 1982-09-27 | Travelling wave tube having a helical delay line |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE3235753A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0589788A (en) * | 1991-09-27 | 1993-04-09 | Nec Corp | Dielectric support for travelling wave tube |
| JPH08111182A (en) | 1994-08-17 | 1996-04-30 | Toshiba Corp | Slow-wave circuit structure for traveling wave tube and its manufacture |
-
1982
- 1982-09-27 DE DE19823235753 patent/DE3235753A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| DE3235753A1 (en) | 1984-03-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 8110 | Request for examination paragraph 44 | ||
| D2 | Grant after examination | ||
| 8364 | No opposition during term of opposition | ||
| 8339 | Ceased/non-payment of the annual fee |