A multichannel electron detection system for use in a stabilized magnetic spectrometer
Kenaston, George W.
Luke, C. Thomas, Jr.
Sones, William C.
Crittenden, E.C., Jr.
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Multichannel counting systems facilitate the determination of differential cross sections in electron scattering experiments. The need for a high resolution counting system capable of handling fast counting rates has led to the construction of a transistorized, multichannel system for use with the 100 Mev linear electron accelerator being constructed at the U.S. Naval Postgraduate School. Design and operation of the counting system are discussed, and testing procedures are described. Since accurate measurement and stability of the spectrometer magnetic field is of fundamental importance in the operation of the multichannel detector, an accurate rotating coil fluxmeter for measuring and regulating the spectrometer magnetic field has also been built and is described. More familiar techniques of magnetic field measurement are not suitable for this application. Measurement of magnet current does not yield sufficient accuracy due to variations in field strength not linearly related to magnet current, and nuclear magnetic resonance devices are impractical where there is an inhomogeneous field such as exists in a double focusing spectrometer magnet. The fluxmeter measures and regulates field strength to an accuracy of one part in 1000 or one gauss, whichever is greater.
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