Cyclotron_diagram.png
Size of this preview:
800 × 397 pixels
.
Other resolutions:
320 × 159 pixels
|
640 × 317 pixels
|
1,004 × 498 pixels
.
Summary
Description Cyclotron diagram.png |
English:
Diagram of a
cyclotron
, a
particle accelerator
invented by
Earnest O. Lawrence
in 1932 and widely used from the 1930s to the 1950s. It consists of a pair of "D" shaped sheet metal electrodes called "Dees" placed face to face inside a vacuum chamber, between the poles of an
electromagnet
. An oscillating radio frequency voltage of several thousand volts is applied to the dees. Atomic particles to be accelerated, such as
protons
are released in the center. The magnetic field causes them to travel in a spiral path from the center to the rim of the dees, being accelerated each time they pass from one electrode to the other. When the particles reach the rim they pass out of the dees through a small gap and strike a target. In this diagram the electromagnet pole pieces are not shown full size; they must be at least as big as the dees to create a uniform field.
Caption: How the cyclotron works. Size of the magnets has been kept down to show the path of the electron |
Date | |
Source | Retrieved November 3, 2014 from Radio-Craft , Radcraft Publications, Springfield, Massachusetts, Vol. 18, No. 9, June 1947 p. 23 on American Radio History archive |
Author | Unknown author Unknown author |
Permission
( Reusing this file ) |
This 1947 issue of Radio-Craft magazine would have the copyright renewed in 1975. Online page scans of the Catalog of Copyright Entries, published by the US Copyright Office can be found here. [1] Search of the Renewals for Periodicals for 1974, 1975, and 1976 show no renewal entries for "Radio-Craft". Therefore the magazine's copyright was not renewed and it is in the public domain. |
Licensing
Public domain Public domain false false |
This work is in the
public domain
because it was published in the United States between 1929 and 1963, and although there may or may not have been a copyright notice, the
copyright was not renewed
. For further explanation, see
Commons:Hirtle chart
and
the copyright renewal logs
. Note that it may still be copyrighted in jurisdictions that do not apply the
rule of the shorter term
for US works (depending on the date of the author's death), such as Canada (70 years
p.m.a.
), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.
العربية ∙ Deutsch ∙ English ∙ español ∙ français ∙ galego ∙ italiano ∙ 日本語 ∙ 한국어 ∙ македонски ∙ português ∙ português do Brasil ∙ русский ∙ sicilianu ∙ slovenščina ∙ українська ∙ 简体中文 ∙ 繁體中文 ∙ +/− |