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Glossary | ||
======== | ||
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This scientific library assumes from its users a large amount of knowledge and a familiarity with | ||
a variety of terminology related to the topic. Furthermore, some amount of naming conventions have | ||
been created here to encode all the necessary functionality in code. This page serves to briefly | ||
explain and define all the terms used throughout the library, both the ones used as a standard in | ||
the wider scientific literature, and the ones specified by this library. For more details, please | ||
see the :doc:`theory` pages. | ||
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Glossary | ||
-------- | ||
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Most relevant terms | ||
^^^^^^^^^^^^^^^^^^^ | ||
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.. glossary:: | ||
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resolution | ||
The ability of an :term:`instrument` to show results in detail. The better the resolution, | ||
the higher the detail and the less broad the peaks. | ||
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resolution function | ||
A mathematical function that models the :term:`resolution` of an :term:`instrument`, as a | ||
function of some physical property, such as energy or momentum. | ||
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instrument | ||
A collection of physical devices used to perform an INS experiment. Different instruments are | ||
set up to specialise in different kinds of experiments, and so they consist of different devices | ||
placed at different distances and made of different materials. This results in different | ||
:term:`resolution` profiles. | ||
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version | ||
A particular combination of parameters for an :term:`instrument`. Over time, instruments are | ||
upgraded by switching out and rearranging their components, resulting in a changed | ||
:term:`resolution` (hopefully improved!). For past and future compatibility, every time an | ||
upgrade significant enough to alter the :term:`resolution` is done, a new "version" is | ||
created for that :term:`instrument`. | ||
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setting | ||
A set of :term:`options<option>` that can be made for a particular :term:`version` of a | ||
particular :term:`instrument`. This can be, for example, the choice of the | ||
:term:`Fermi chopper` parameters. | ||
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option | ||
One of the options that can be chosen for a given :term:`setting`. This is tied to a | ||
particular :term:`version` of a particular :term:`instrument`. For example, if a | ||
:term:`Fermi chopper` is a :term:`setting`, the "option" is one of the choices that can be | ||
made for that :term:`Fermi chopper`. | ||
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model | ||
A method to represent the :term:`resolution function`. There are different ways of | ||
approximating the :term:`resolution function`, each taking into account different levels of | ||
detail. The same model can often be used to describe multiple similar | ||
:term:`instruments<instrument>` or multiple :term:`versions<version>` of an | ||
:term:`instrument`, but in the context of this package, a model can only be accessed through | ||
a particular :term:`version` of an :term:`instrument`. | ||
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Neutron terminology | ||
^^^^^^^^^^^^^^^^^^^ | ||
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.. glossary:: | ||
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source | ||
A device that produces neutrons used for neutron experiments. In practice, this is usually | ||
either a nuclear reactor or spallation source (a particle accelerator). | ||
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target | ||
A material used in spallation :term:`sources<source>`, which is hit by the particle produced | ||
from the accelerator. The collision emits neutrons which are used for the experiments. | ||
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moderator | ||
A material used to slow down the neutrons produced by the collision with the :term:`target`. | ||
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beam | ||
A collection of neutrons. In nuclear reactor :term:`sources<source>`, this is usually a | ||
continuous beam (somewhat similar to a laser beam), while in spallation | ||
:term:`sources<source>` this is usually a pulse (a short burst). | ||
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chopper | ||
A rotating mechanical device designed to block the neutron :term:`beam` for some fraction of | ||
each revolution. | ||
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Fermi chopper | ||
A :term:`chopper` designed to select a particular narrow slice of energies from the wide | ||
range of energies coming from the moderator. This kind of :term:`chopper` often has multiple | ||
openings, allowing the user to make a choice of which energies to use or how good a | ||
:term:`resolution` to obtain. | ||
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disk chopper | ||
A type of :term:`chopper` shaped like a disk. Can be used for various purposes, such as | ||
improving :term:`resolution` or removing contamination, etc. | ||
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sample | ||
The material being studied by the neutron experiment. Unless specified otherwise, in this | ||
library the term "sample" combines two things: the :term:`sample environment` and the sample | ||
itself. The latter is the stuff that the user brings to be studied, in :term:`INS` usually | ||
a single crystal or a powder. | ||
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sample environment | ||
A device used to enclose the :term:`sample`, usually an aluminium "can". May consist of | ||
extra parts, such as a cooling system. Further parts may also be present, such as a vacuum | ||
pump or extra experimental devices like a Raman spectrometer, but these are generally not | ||
exposed to the neutron :term:`beam` and therefore shouldn't affect the :term:`resolution`. | ||
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detector | ||
A device used used to detect the presence of a neutron. These are placed in an array such | ||
that the the neutrons that hit the :term:`sample`, hit the detectors, registering where and | ||
when the neutron hit the detector. | ||
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.. _abbreviations: | ||
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Abbreviations and Acronyms | ||
-------------------------- | ||
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.. glossary:: | ||
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INS | ||
Inelastic Neutron Scattering | ||
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FWHM | ||
Full Width Half Maximum | ||
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FWHH | ||
Full Width Half Height |
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