GB940055A - Permanent magnet electron-beam focussing arrangements - Google Patents
Permanent magnet electron-beam focussing arrangementsInfo
- Publication number
- GB940055A GB940055A GB16747/62A GB1674762A GB940055A GB 940055 A GB940055 A GB 940055A GB 16747/62 A GB16747/62 A GB 16747/62A GB 1674762 A GB1674762 A GB 1674762A GB 940055 A GB940055 A GB 940055A
- Authority
- GB
- United Kingdom
- Prior art keywords
- arrangement
- periodic
- division
- electron beam
- field
- 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
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
- H01J23/02—Electrodes; Magnetic control means; Screens
- H01J23/08—Focusing arrangements, e.g. for concentrating stream of electrons, for preventing spreading of stream
- H01J23/087—Magnetic focusing arrangements
- H01J23/0873—Magnetic focusing arrangements with at least one axial-field reversal along the interaction space, e.g. P.P.M. focusing
Landscapes
- Microwave Tubes (AREA)
- Particle Accelerators (AREA)
Abstract
940,055. Travelling wave tubes. SIEMENS & HALSKE A.G. May 1, 1962 [May 2, 1961], No. 16747/62. Heading H1D. An electron beam focusing arrangement, preferably for a travelling wave tube, comprises a plurality of permanent magnets 1, 2, 3, 4, Fig. 1, symmetrically disposed about the electron beam and interconnected by a soft iron member or members 5, 6, 7, 8 disposed across the width of the arrangement wherein the or each member has a bore formed therein for accommodating the discharge tube and wherein the arrangement is constituted by two parts which mate along a plane containing the axis of the discharge tube. The polepieces 5, 6, 7, 8 may be hinged along their line of division (dotted line 10). The device shown produces a periodic magnetic focusing field. The feeder waveguides are also divided longitudinally along the wider face, Fig. 2 (not shown), so that the N 10 field lines are undisturbed by the division. The periodic focusing system may be replaced by ferrite rings or by a non-periodic permanent magnetic focusing system producing a uniform field.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES73780A DE1298197B (en) | 1961-05-02 | 1961-05-02 | Permanent magnet system for the bundled guidance of the electron beam of a field tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB940055A true GB940055A (en) | 1963-10-23 |
Family
ID=7504183
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB16747/62A Expired GB940055A (en) | 1961-05-02 | 1962-05-01 | Permanent magnet electron-beam focussing arrangements |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US3181042A (en) |
| DE (1) | DE1298197B (en) |
| GB (1) | GB940055A (en) |
| NL (1) | NL277862A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5744910A (en) * | 1993-04-02 | 1998-04-28 | Litton Systems, Inc. | Periodic permanent magnet focusing system for electron beam |
| US10338002B1 (en) | 2016-02-01 | 2019-07-02 | Kla-Tencor Corporation | Methods and systems for selecting recipe for defect inspection |
| US10211021B2 (en) | 2016-04-11 | 2019-02-19 | Kla-Tencor Corporation | Permanent-magnet particle beam apparatus and method incorporating a non-magnetic metal portion for tunability |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE528454A (en) * | 1953-04-29 | |||
| NL99653C (en) * | 1956-03-01 | |||
| US2791718A (en) * | 1956-04-23 | 1957-05-07 | Bell Telephone Labor Inc | Magnetic structure for traveling wave tubes |
| NL218874A (en) * | 1957-07-11 | |||
| US2985791A (en) * | 1958-10-02 | 1961-05-23 | Hughes Aircraft Co | Periodically focused severed traveling-wave tube |
-
0
- NL NL277862D patent/NL277862A/xx unknown
-
1961
- 1961-05-02 DE DES73780A patent/DE1298197B/en active Pending
-
1962
- 1962-04-30 US US190890A patent/US3181042A/en not_active Expired - Lifetime
- 1962-05-01 GB GB16747/62A patent/GB940055A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE1298197B (en) | 1969-06-26 |
| US3181042A (en) | 1965-04-27 |
| NL277862A (en) |
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