A simple method for examining the optics of a magnetic spectrometer using an α-particle source

doi:10.1016/0167-5087(82)90590-7

Nuclear Instruments and Methods in Physics Research

Volume 201, Issues 2–3, 15 October 1982, Pages 519-521

https://doi.org/10.1016/0167-5087(82)90590-7 Get rights and content

Abstract

An α-particle source and slotted entrance aperture has been used to investigate the optics of a magnetic spectrometer. The method described has proved to be a simple and accurate way of mapping out the focal plane, obtaining information about the aberrations, and hence determining the optimum field settings for some of the magnetic elements.

References (3)

A.G. Drentje et al.
Nucl. Instr. and Meth.
(1974)
N.E. Sanderson
Daresbury Laboratory Study Weekend Report No. DL/NUC/R19
(1979)

There are more references available in the full text version of this article.

Cited by (2)

Beijing Q3D magnetic spectrometer and its applications
1993, Nuclear Inst. and Methods in Physics Research, A
The Beijing Q3D magnetic spectrometer has been used for many experiments in this laboratory. It is found that the locations of the effective field boundaries (EFB) of the dipole magnets with the floating snakes are shifted towards the magnets, comparing with the design. Their effects on the ion-optical performances of the spectrometer were checked by the calculation with the program RAYTRACE and a method to reoptimize the performance with the program is described. The experimental investigation of the spectrometer performances has been carried out by the so-called “experimental ray-tracing” method. A method to adjust experimentally the focal plane angle in a finite region is proposed. The focal plane angle of 47.5° has been adjusted successfully to the original designed value, 45°. By the use of this method not only the various features of the spectrometer are well determined, but also the empirical field-setting for every adjustable magnetic element is uniquely set up. Some of the applications are mentioned in this paper.
The oxford MDM-2 magnetic spectrometer
1986, Nuclear Inst. and Methods in Physics Research, A
A new high resolution magnetic spectrometer — the Oxford MDM-2 spectrometer — has been designed, installed and tested. The layout of the magnetic elements is in the order: entrance sextupole and multipole, gradient-field dipole and exit multipole. The device has a “normal” focal plane, and the 1.6 m radius dipole magnet has a maximum mass-energy product of 315 MeV amu. At the maximum solid angle of 8 msr, the ratio of energies that can be accepted by the spectrometer (E_max/E_min) is 1.31.
Precide measurements have been performed on the magnetic elements. The dipole magnet has very low hysteresis and field integral errors that amount to less than 1 part in 10⁴. After some in situ modifications the field distributions of the magnets closely approximated the original design specifications.
On-line tests with various ion-beams have revealed the optimum setting for each element. These are close to theoretical predictions from the program RAYTRACE, incorporating the parameterised results of the magnetic measurements. An aberration limited resolution (E/ΔE) of greater than 3000 has been observed at 8 msr solid angle.

View full text

Letter to the editorA simple method for examining the optics of a magnetic spectrometer using an α-particle source

Abstract

Nucl. Instr. and Meth.

Daresbury Laboratory Study Weekend Report No. DL/NUC/R19

Letter to the editor
A simple method for examining the optics of a magnetic spectrometer using an α-particle source