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The Design, Construction, and Performance of a Magnetic Focusing, Semi-Circular, Low Energy Beta-Ray Spectrometer

Henrikson, H. E. and DuMond, Jesse W. M. (1956) The Design, Construction, and Performance of a Magnetic Focusing, Semi-Circular, Low Energy Beta-Ray Spectrometer. , Pasadena, CA. (Unpublished) https://resolver.caltech.edu/CaltechAUTHORS:20140629-192312570

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Abstract

A semi-circular beta-ray spectrometer (Fig. 1) has been constructed for operation between 2 and 120 kev electron energy. This instrument was designed to supplement the ring- focusing beta-ray spectrometer whose lower limit is approximately 25 kev. The 180° spectrometer has an electron trajectory radius of 12 cm. The field is produced by two iron free coils spaced to give a nearly homogeneous field (with some second order focusing) in the region of the electron trajectories . The field current is supplied by a one kw motor- generator set. Stabilization is obtained to 2 parts in 10, 000 with a rotating electro- mechanical unit and an electronic servo system. Source and Geiger counter window dimensions for a standard resolution of 0 .8% are 0.1 cm x 4 cm. With a 10 μ.g/cm^2 formvar window, transmission is assured down to 2 kev electron energy. A recording potentiometer traces the counting rate vs. electron energy. Several examples of chart recordings are reproduced to illustrate the performance of the semi- circular beta-ray spectrometer.


Item Type:Report or Paper (Technical Report)
Alternate Title:Special Technical Report No. 24
Funders:
Funding AgencyGrant Number
Atomic Energy CommissionAT(04-3)-63
Record Number:CaltechAUTHORS:20140629-192312570
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140629-192312570
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46560
Collection:CaltechAUTHORS
Deposited By: Joy Painter
Deposited On:01 Jul 2014 19:22
Last Modified:03 Oct 2019 06:45

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