The NRL Cyclotron Ion Optics System

Author

Shapiro, P. ; Theus, R.B. ; Frame, J.M.

Author_Institution

U. S. Naval Research Laboratory Washington, D. C. 20390

Volume

12

Issue

3

fYear

1965

fDate

6/1/1965 12:00:00 AM

Firstpage

917

Lastpage

921

Abstract

A 9 foot radius, 135 degree, double focusing magnet, having a second order energy resolution less than 2 Ã— 10-4 for 1 mm slits, is the principal element in the NRL Cyclotron Ion Optics System. A 21.5 inch wide pole face and 4.75 inch gap provide radial and axial acceptance angles of 3.0 degrees and 1.3 degrees respectively. This 80 ton magnet can be remotely traversed on a tracking system making it possible to bring the energy-analyzed beam into either of two experimental vaults for use along 8 different beam paths. Also described is the coupling of quadrupoles with the analyzing magnet in a manner that provides a minimum dispersion system when the full cyclotron beam intensity is desired on the experimental target. Ray-tracing calculations have been performed to determine the properties of the composite ion optics system, and the influence on image quality of power supply fluctuations and quadrupole misalignment. The design criteria for the system, the calculational methods used in the ray-tracing programs, and the results of ray-tracing along typical paths is discussed.

Keywords

Cyclotrons; Energy resolution; Focusing; Foot; Image quality; Magnetic analysis; Optical coupling; Particle beam optics; Power supplies; Ray tracing;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/TNS.1965.4323758

Filename

4323758