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Plasmas in Magnetic Fields
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<font size="5" color="white"><strong>Plasmas:</strong> Plasmas in Magnetic
Fields</font>
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<b>What's all the con-fusion?</b>
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Did you know we live in a world with an environmentally friendly,
almost limitless fuel supply? The abundant supply of water on the
planet contains the hydrogen isotopes necessary to produce fusion, a
nuclear process which produces little radiocative waste and
signficantly more energy than the alternatives. But fusion requires
extremely high temperatures, the type of temperatures that produce
plasma. And that's the problem. When the hot plasma comes in contact
with the walls of the fusion reactor it would either destroy the
container, or itself be cooled, shutting down the fusion reaction.
On the last page we saw the impact of electric fields on plasma. On
this page we'll explore how magnetic fields effect plasma, something
present day scientists are investigating in an effort to make
controlled nuclear fusion practical.
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<img width="230" src="plasma.gif" height="160">
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<font size="1">Glowing plasma inside a fusion research reactor.<br>For
the fusion to occur, plasma temperature needs to<br>reach
approximately 100 million degrees Celsius<br>(more than six times
hotter than the center of the sun).<br>Can magnetic fields be used
to confine this plasma?</font>
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<font size="5" color="#5c7b67"><b>Effect of Magnetic Fields on
Plasma </b></font>
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1. Click Run and observe the motion of the two plasma particles (one
electron and one cation) in the model container to the right.
Charges are shown to remind you that plasma contains <font color="red">charged</font>
particles.
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2. Manipulate the three buttons below which control the magnetic
field. Observe the effect of the various options (Note: Magnetic
field "inward" means the field runs into and perpendicular to your
computer screen and "outward" indicates a magnetic field
perpendicular to and running out of the screen.) Can you make it
so the plasma particles do not touch the sides of the container?
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3. Also explore what would occur if plasma particles were not
charged by clicking the "uncharge atoms" button.
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magnetic field OFF
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<strong>Based on your observations, which is easier to control with a
magnetic field, gas or plasma? Explain your answer. Consider exploring the
model to the right if you want additional evidence before answering.</strong>
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<strong>Explain whether or not you believe magnetic fields can be used to
confine nuclear fusion fuel to avoid hitting the walls of the reaction
vessel.</strong>
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