184-inch cyclotron vertical beam oscillations in the region of 82-inch radius

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Material Information

Title:
184-inch cyclotron vertical beam oscillations in the region of 82-inch radius
Series Title:
United States. Atomic Energy Commission. MDDC ;
Physical Description:
7 p. : ill., diagrams ; 27 cm.
Language:
English
Creator:
Vale, James
University of California
U.S. Atomic Energy Commission
Publisher:
Technical Information Division, Oak Ridge Operations
Place of Publication:
Oak Ridge, Tenn
Publication Date:

Subjects

Subjects / Keywords:
Cyclotrons   ( lcsh )
Genre:
federal government publication   ( marcgt )
non-fiction   ( marcgt )

Notes

Bibliography:
Includes bibliography references.
Statement of Responsibility:
by James Vale.

Record Information

Source Institution:
University of Florida
Rights Management:
All applicable rights reserved by the source institution and holding location.
Resource Identifier:
aleph - 005023541
oclc - 277228093
System ID:
AA00008520:00001

Full Text


~4t7?r


MDDC


-984


UNITED


TATE


ATOMIC


ENERGY


COMMIT


ION


184-INCH CYCLOTRON VERTICAL BEAM OSCILLATIONS

IN THE REGION OF 82-INCH RADIUS



by
James Vale


University of California








This document consists of 7 + 1 pages


Date of Manuscript:
Date Declassified:


February 26, 1947
May 23, 1947


Its issuance does not constitute authority
to declassify copies or versions of the
same or similar content and title
and by the same suthor(s).


..... DEPOSITORY
Technical Information Division, Oak Ridge Directed Operations----
AEC, Oak Ridge, Tenn., 10-22-48--1000-11980



































Digitized by the Internet Arch


in 2011 with funding from
University of Florida, George A. Smathers Libraries with support from LYRASIS and the Sloan Foundation
















184-INCH CYCLOTRON VERTICAL BEAM OSCILLATIONS
IN THE REGION OF 82-INCH RADIUS


By James Vale


Experiment done by: L.


House


, R. Watt, and J. Vale


INTRODUCTION
It was discovered early in the operation of the 184-inch cyclotron, that the beam did not go out
to the expected 85-inch radius.
The Theoretical Group suggested that the beam did not go beyond a radius of 82 inches because


of vertical oscillations building up in the vicinity of this point.


According to their calculations, the


vertical oscillations built up a large enough amplitude at the point where n


= 0.2 (n


= R/H dH/dR)


so that the beam hit the dee and was lost. An attempt had been made to find this vertical spreading,


previously, but it was unsuccessful.


Consequently, the following experiment was performed.


EXPERIMENTAL SETUP


Several targets were made of 1/16-inch copper sheet.


These were U-shaped and were placed in


the tank and bombarded. The plane of the sheet was vertical, and the arms of the U were roughly par-


allel to the dee face.


Thus


See sketch of target appended hereto.


, the beam had to traverse the slot in the U to reach the back of the target. Hence, any


vertical spreading in the beam would result in its hitting the U arms.
These targets were run into the tank, one at a time, on the regular probe mechanism, were bom-
barded with a large deuteron beam for about 1 to 3 minutes, removed from the tank and radioauto-


graphs were taken to determine where the beam was Litting.


The targets differed only in the width


of the slot. These slot widths varied from 2 1/2 to 4 1/2 inches.

RESULTS


The autographs indicate a rapid spreading vertically of the beam at about 81 1/2 inches.


This


agrees quite closely with the point at which n


= 0.2 from magnetic measurements.


The autographs


indicate that the vertical spreading is large enough


so that most of the beam gets caught by the dee


at this point. (Prints of autographs appear on following pages











MDDC 984


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