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Volume 7 | Issue 2 April 2K19
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Fabrication, Assembly and Testing of Multiwire Proportional Counters |
Author(s): |
Lakshmi Dagar , Amity Institute of Applied Sciences (Amity University) Noida, U. P.; Kajol Chakraborty, Amity Institute of Applied Sciences (Amity University) Noida, U. P.; Punita Verma, Kalindi College, University of Delhi, New Delhi; Akhil Jhinghan, Inter University Accelerator Center, Aruna Asaf Ali Marg, New Delhi |
Keywords: |
Multiwire Proportional Counters, Fabrication, Detector |
Abstract |
Multiwire Proportional Counter (MWPC), a particle studied under
this project is an indispensable part of all nuclear physics experiments
involving the study of compound nucleus and fission fragments. The work
done under this project involves the fabrication, assembly and testing
of a MWPC. The experimental work has been done at Inter University
Accelerator Center (IUAC), New Delhi. The MWPC fabricated at IUAC had an
active area of 16x11 cm2. Timing resolution and gain of the fabricated
MWPC was made to improve over that of already available MWPCs at IUAC by
reducing the anode wire pitch and using a ten micrometer diameter wire
for anode frame. The fabricated MWPC was thoroughly tested with an alpha
source and it was observed that the detector could handle heavy count
rate exceeding 20 KHz without any breakdown. Fabricated MWPC was also
used in a nuclear physics experiment in the NAND experimental set up of
IUAC to extract information about mass, kinetic energy and angular
distribution of fission fragments. All the detailed investigations done
with the detector were part of the M.Sc. Dissertation work of the first
two authors. During under graduation and post-graduation, students study
about proportional counters with emphasis on their construction and
basic principle of operation. However, this project work provided the
first two authors with a unique opportunity of getting a practical
experience on how these proportional counters are fabricated and their
importance in the field of nuclear physics. Thus, project based learning
leaves a larger impact on the mind of the students as far as
understanding of concepts of science is concerned
Introduction
A multi wire proportional counter is simply a gas filled wire chamber consisting of a large number of anode wires stretched in a plane for position measurement. The original motivation of developing such detectors came from the need to track particles in high energy physics experiments. The wire chambers, thus developed worked amazingly well and helped scientists make grea discoveries at particle accelerators. Although these chambers are still used in some laboratories, but since the advent ofhigh resolution silicon detectors their utility has somewhat diminished. Fig.1 shows the sketch of a typical multi wire proportional chamber [1]. The closely spaced thin anode wires are stretched in a plane that is midway between two cathode planes. The cathodes are kept at negative potential with respect to anode wires that are kept at ground potential. Each of the anode wires acts as an independent proportional counter and must therefore be read out independently [2].
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