Thickness measurement of ammonia targets used in SLAC E143 experiment
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Authors
Garvey, David Raymond
Subjects
NA
Advisors
Maruyama, Xavier K.
Date of Issue
1994-12
Date
December 1994
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
One of the primary research tools in high energy physics is the collision of beams of particles with stationary targets. The jful information that may be extracted from such experiments is proportional to knowledge of the thickness of the target. This termines how many point constituents were available for the particles in the beam to interact with. It is possible to determine thickness of a target with statistical errors of the order of one percent by the use of x-ray attenuation measurements. Six target samples from the Stanford Linear Accelerator Center Experiment #143, "Nucleon Spin Structure at 30 GeV," were :asured using this method. The targets were frozen ammonia crystals. A 40 mCurie americium 241 source was used to pass a imated beam of known intensity x-rays through the samples. The x-ray intensity on the other side was measured by a silicon 1 detector. The ammonia material was removed and the process repeated. By comparing the intensities with and without the iterial to the tabulated attenuation coefficients, the thickness of material is calculated.
Type
Thesis
Description
Series/Report No
Department
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
37 p.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.