Laboratory Experiments on the interaction of electromagnetic waves at plasma gradients Walter...
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Transcript of Laboratory Experiments on the interaction of electromagnetic waves at plasma gradients Walter...
![Page 1: Laboratory Experiments on the interaction of electromagnetic waves at plasma gradients Walter Gekelman Pat Pribyl Yuhou Wang* * Left for position at LAM.](https://reader036.fdocuments.net/reader036/viewer/2022081603/5697bf9a1a28abf838c92124/html5/thumbnails/1.jpg)
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Laboratory Experiments on the interaction of electromagnetic waves at plasma gradients
Walter GekelmanPat PribylYuhou Wang*
* Left for position at LAM research
![Page 2: Laboratory Experiments on the interaction of electromagnetic waves at plasma gradients Walter Gekelman Pat Pribyl Yuhou Wang* * Left for position at LAM.](https://reader036.fdocuments.net/reader036/viewer/2022081603/5697bf9a1a28abf838c92124/html5/thumbnails/2.jpg)
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UCLA experiments: Plasma modification and wave generation by cross-field high power rf pulses
Intense X-band microwave pulses (200 kW, near fpe or fuh) are delivered into a magnetized plasma column transverse to Bo. Heating energy is found to be deposited in a narrow layer determined by plasma density and background magnetic field.
Generation of low frequency waves from 9.6 GHz microwave bursts
![Page 3: Laboratory Experiments on the interaction of electromagnetic waves at plasma gradients Walter Gekelman Pat Pribyl Yuhou Wang* * Left for position at LAM.](https://reader036.fdocuments.net/reader036/viewer/2022081603/5697bf9a1a28abf838c92124/html5/thumbnails/3.jpg)
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Electron Heating MEASURED WITH A STEP-SWEPT LANGMUIR PROBE
Single Pulse Multiple pulsesfe(E)
![Page 4: Laboratory Experiments on the interaction of electromagnetic waves at plasma gradients Walter Gekelman Pat Pribyl Yuhou Wang* * Left for position at LAM.](https://reader036.fdocuments.net/reader036/viewer/2022081603/5697bf9a1a28abf838c92124/html5/thumbnails/4.jpg)
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Lower hybrid waves are generated
Electrostatic waves measured with an electric dipole probenote : fce = 1.1 GHzfLH = 26 MHz
![Page 5: Laboratory Experiments on the interaction of electromagnetic waves at plasma gradients Walter Gekelman Pat Pribyl Yuhou Wang* * Left for position at LAM.](https://reader036.fdocuments.net/reader036/viewer/2022081603/5697bf9a1a28abf838c92124/html5/thumbnails/5.jpg)
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Wave frequencyfci = 122 kHzdz = 3.84 m
Wave Components
![Page 6: Laboratory Experiments on the interaction of electromagnetic waves at plasma gradients Walter Gekelman Pat Pribyl Yuhou Wang* * Left for position at LAM.](https://reader036.fdocuments.net/reader036/viewer/2022081603/5697bf9a1a28abf838c92124/html5/thumbnails/6.jpg)
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Are they Alfvén waves?
Dispersionmeasured
Wave amplitude proportional to input microwave power
![Page 7: Laboratory Experiments on the interaction of electromagnetic waves at plasma gradients Walter Gekelman Pat Pribyl Yuhou Wang* * Left for position at LAM.](https://reader036.fdocuments.net/reader036/viewer/2022081603/5697bf9a1a28abf838c92124/html5/thumbnails/7.jpg)
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DURIP proposal submitted
Intent : To purchase microwave hardware ( arbitrary waveform generator, high power amplifier, mixers…)to enable launching tailored microwave waveforms (swept amplitude/frequency)And measure E,B with a hetrodyne system
![Page 8: Laboratory Experiments on the interaction of electromagnetic waves at plasma gradients Walter Gekelman Pat Pribyl Yuhou Wang* * Left for position at LAM.](https://reader036.fdocuments.net/reader036/viewer/2022081603/5697bf9a1a28abf838c92124/html5/thumbnails/8.jpg)
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![Page 9: Laboratory Experiments on the interaction of electromagnetic waves at plasma gradients Walter Gekelman Pat Pribyl Yuhou Wang* * Left for position at LAM.](https://reader036.fdocuments.net/reader036/viewer/2022081603/5697bf9a1a28abf838c92124/html5/thumbnails/9.jpg)
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