Design and Development of a Mini-Orange Magnetic Spectrometer with Multichannel Facility for Conversion Electron Spectroscopy

K.  Venkataramaniah; M.  Sainath; K.Vijay  Sai; Dwarakarani  Rao; Deepa  Seetharaman

doi:10.15415/jnp.2020.81004

Authors

K. Venkataramaniah Laboratories for Nuclear Research, Department of Physics, Sri Sathya Sai Institute of Higher Learning, Prasanthi Nilayam, Andhra Pradesh-515134, India
M. Sainath ICFAI Group, Hyderabad-500044, India
K. Vijay Sai Laboratories for Nuclear Research, Department of Physics, Sri Sathya Sai Institute of Higher Learning, Prasanthi Nilayam, Andhra Pradesh-515134, India
Dwarakarani Rao Laboratories for Nuclear Research, Department of Physics, Sri Sathya Sai Institute of Higher Learning, Prasanthi Nilayam, Andhra Pradesh-515134, India
Deepa Seetharaman Laboratories for Nuclear Research, Department of Physics, Sri Sathya Sai Institute of Higher Learning, Prasanthi Nilayam, Andhra Pradesh-515134, India

DOI:

https://doi.org/10.15415/jnp.2020.81004

Keywords:

Permanent magnets, Toroidal field, Mini- Orange, Magnetic spectrometer, Orange type filter, Transmission, Multichannel facility

Abstract

Background: Conventional magnetic spectrometers used for conversion electron detection are very cumbersome, require strong magnetic fields and the spectra have to be scanned point by point and have very low transmission. A magnetic filter using permanent magnets and an Si(Li) detector would facilitate multichannel analysis with high transmission. The mini-orange is a new type of spectrometer for conversion electrons combining a solid state Si(Li) detector with a filter of permanent magnets around a central absorber of lead.
Purpose: An indigenously developed magnetic spectrometer if optimized properly would be of great use in conversion electron spectroscopy for both online and offline experiments.
Methods: A Mini-Orange magnetic spectrometer made of small permanent magnets has been designed and developed indigenously and optimized for its best performance condition. The transmission curves for different energy regions are plotted using the conversion electron spectra from the standard gamma transitions from ¹⁵³Gd, ¹⁶⁹Yb and ¹³¹Ba decays. The optimized spectrometer facilitates multichannel acquisition of conversion electron spectra for precision electron spectroscopy. The system also can be used in in-beam experiments with minor modifications of the vacuum chamber.
Results: The optimized spectrometer was used for precision electron spectroscopy. Experimental transmission curves are then obtained by plotting Transmission (T) against the corresponding electron energy for low energy, medium energy and a broad energy range. Out of the several experiments done the optimum settings for f and g, that resulted in this curve, is identified at f = 7.5 cm and g = 4.5 cm.
Conclusions: The optimized spectrometer facilitates multichannel acquisition of conversion electron spectra for precision electron spectroscopy. The system also can be used in in-beam experiments with minor modifications of the vacuum chamber.

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Author Biography

Dwarakarani Rao, Laboratories for Nuclear Research, Department of Physics, Sri Sathya Sai Institute of Higher Learning, Prasanthi Nilayam, Andhra Pradesh-515134, India

Professor of Physics

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