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<h2 class="hd hd-2 unit-title">3.2.2. Notes & Additional Material</h2>
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<p><a href="/assets/courseware/v1/c715d6fc1eb79df3b4ae325e6d42a62c/asset-v1:MITx+22.011x+3T2018+type@asset+block/Unit_3.2.2_required_pdf_lecture_notes_vf.pdf" target="[object Object]">Lecture 3.2.2. [Lorenz Force and Magnetic Confinement] - Required Lecture Notes</a></p>
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<h2 class="hd hd-2 unit-title">3.2.2 Required Assessment</h2>
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Assessment 1
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<legend id="1345a4ed43ff4c01981a036112c512b2_2_1-legend" class="response-fieldset-legend field-group-hd">There are a variety of ways to heat a fusion plasma up to 15 keV temperatures. How long the heat (energy) is retained in the plasma is the energy confinement time</legend>
<p class="question-description" id="description_1345a4ed43ff4c01981a036112c512b2_1_1">Select all that apply </p>
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<input type="checkbox" name="input_1345a4ed43ff4c01981a036112c512b2_2_1[]" id="input_1345a4ed43ff4c01981a036112c512b2_2_1_choice_0" class="field-input input-checkbox" value="choice_0"/><label id="1345a4ed43ff4c01981a036112c512b2_2_1-choice_0-label" for="input_1345a4ed43ff4c01981a036112c512b2_2_1_choice_0" class="response-label field-label label-inline" aria-describedby="status_1345a4ed43ff4c01981a036112c512b2_2_1 description_1345a4ed43ff4c01981a036112c512b2_1_1"> The confinement time in the Lawson criterion is the energy confinement time
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<input type="checkbox" name="input_1345a4ed43ff4c01981a036112c512b2_2_1[]" id="input_1345a4ed43ff4c01981a036112c512b2_2_1_choice_1" class="field-input input-checkbox" value="choice_1"/><label id="1345a4ed43ff4c01981a036112c512b2_2_1-choice_1-label" for="input_1345a4ed43ff4c01981a036112c512b2_2_1_choice_1" class="response-label field-label label-inline" aria-describedby="status_1345a4ed43ff4c01981a036112c512b2_2_1 description_1345a4ed43ff4c01981a036112c512b2_1_1"> The confinement time is identical to plasma lifetime, or pulse length
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<input type="checkbox" name="input_1345a4ed43ff4c01981a036112c512b2_2_1[]" id="input_1345a4ed43ff4c01981a036112c512b2_2_1_choice_2" class="field-input input-checkbox" value="choice_2"/><label id="1345a4ed43ff4c01981a036112c512b2_2_1-choice_2-label" for="input_1345a4ed43ff4c01981a036112c512b2_2_1_choice_2" class="response-label field-label label-inline" aria-describedby="status_1345a4ed43ff4c01981a036112c512b2_2_1 description_1345a4ed43ff4c01981a036112c512b2_1_1"> The energy confinement time in self-sustaining fusion plasma with the required density and temperature needs to be at least a second
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<input type="checkbox" name="input_1345a4ed43ff4c01981a036112c512b2_2_1[]" id="input_1345a4ed43ff4c01981a036112c512b2_2_1_choice_3" class="field-input input-checkbox" value="choice_3"/><label id="1345a4ed43ff4c01981a036112c512b2_2_1-choice_3-label" for="input_1345a4ed43ff4c01981a036112c512b2_2_1_choice_3" class="response-label field-label label-inline" aria-describedby="status_1345a4ed43ff4c01981a036112c512b2_2_1 description_1345a4ed43ff4c01981a036112c512b2_1_1"> If the heat leaves the plasma too quickly, more energy will be needed to keep the plasma hot. This would limit a fusion system, since achieving net-energy (more energy out than in) is the goal
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Assessment 2
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<legend id="8cd2401d302c4cf5a8c7caf133ca36ad_2_1-legend" class="response-fieldset-legend field-group-hd">Magnetic fields are useful for confining fusion plasma because:</legend>
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<input type="checkbox" name="input_8cd2401d302c4cf5a8c7caf133ca36ad_2_1[]" id="input_8cd2401d302c4cf5a8c7caf133ca36ad_2_1_choice_1" class="field-input input-checkbox" value="choice_1"/><label id="8cd2401d302c4cf5a8c7caf133ca36ad_2_1-choice_1-label" for="input_8cd2401d302c4cf5a8c7caf133ca36ad_2_1_choice_1" class="response-label field-label label-inline" aria-describedby="status_8cd2401d302c4cf5a8c7caf133ca36ad_2_1 description_8cd2401d302c4cf5a8c7caf133ca36ad_1_1"> they are used to hold the plasma away from vessel walls
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<input type="checkbox" name="input_8cd2401d302c4cf5a8c7caf133ca36ad_2_1[]" id="input_8cd2401d302c4cf5a8c7caf133ca36ad_2_1_choice_2" class="field-input input-checkbox" value="choice_2"/><label id="8cd2401d302c4cf5a8c7caf133ca36ad_2_1-choice_2-label" for="input_8cd2401d302c4cf5a8c7caf133ca36ad_2_1_choice_2" class="response-label field-label label-inline" aria-describedby="status_8cd2401d302c4cf5a8c7caf133ca36ad_2_1 description_8cd2401d302c4cf5a8c7caf133ca36ad_1_1"> they naturally produce confinement perpendicular to the field lines, but not parallel to the field lines
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<input type="checkbox" name="input_8cd2401d302c4cf5a8c7caf133ca36ad_2_1[]" id="input_8cd2401d302c4cf5a8c7caf133ca36ad_2_1_choice_4" class="field-input input-checkbox" value="choice_4"/><label id="8cd2401d302c4cf5a8c7caf133ca36ad_2_1-choice_4-label" for="input_8cd2401d302c4cf5a8c7caf133ca36ad_2_1_choice_4" class="response-label field-label label-inline" aria-describedby="status_8cd2401d302c4cf5a8c7caf133ca36ad_2_1 description_8cd2401d302c4cf5a8c7caf133ca36ad_1_1"> all plasmas in nature are confined by magnetic fields
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Assessment 3
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<legend id="e35c7dbc32e24bf7a825d3bb2ae6013f_2_1-legend" class="response-fieldset-legend field-group-hd">When a charged particle is acted on by a magnetic field, the force is called</legend>
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<input type="radio" name="input_e35c7dbc32e24bf7a825d3bb2ae6013f_2_1" id="input_e35c7dbc32e24bf7a825d3bb2ae6013f_2_1_choice_1" class="field-input input-radio" value="choice_1"/><label id="e35c7dbc32e24bf7a825d3bb2ae6013f_2_1-choice_1-label" for="input_e35c7dbc32e24bf7a825d3bb2ae6013f_2_1_choice_1" class="response-label field-label label-inline" aria-describedby="status_e35c7dbc32e24bf7a825d3bb2ae6013f_2_1 description_e35c7dbc32e24bf7a825d3bb2ae6013f_1_1"> The Coulomb force
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<input type="radio" name="input_e35c7dbc32e24bf7a825d3bb2ae6013f_2_1" id="input_e35c7dbc32e24bf7a825d3bb2ae6013f_2_1_choice_2" class="field-input input-radio" value="choice_2"/><label id="e35c7dbc32e24bf7a825d3bb2ae6013f_2_1-choice_2-label" for="input_e35c7dbc32e24bf7a825d3bb2ae6013f_2_1_choice_2" class="response-label field-label label-inline" aria-describedby="status_e35c7dbc32e24bf7a825d3bb2ae6013f_2_1 description_e35c7dbc32e24bf7a825d3bb2ae6013f_1_1"> The gravitational force
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<input type="radio" name="input_e35c7dbc32e24bf7a825d3bb2ae6013f_2_1" id="input_e35c7dbc32e24bf7a825d3bb2ae6013f_2_1_choice_3" class="field-input input-radio" value="choice_3"/><label id="e35c7dbc32e24bf7a825d3bb2ae6013f_2_1-choice_3-label" for="input_e35c7dbc32e24bf7a825d3bb2ae6013f_2_1_choice_3" class="response-label field-label label-inline" aria-describedby="status_e35c7dbc32e24bf7a825d3bb2ae6013f_2_1 description_e35c7dbc32e24bf7a825d3bb2ae6013f_1_1"> The Lawson force
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