MARC 主機 00000nam a2200469K 4500
001 AAI22621709
005 20201105110223.5
006 m o d
007 cr mn ---uuuuu
008 201105s2019 miu sbm 000 0 eng d
020 9781392653197
035 (MiAaPQ)AAI22621709
040 MiAaPQ|beng|cMiAaPQ|dNTU
100 1 Banasek, Jacob Thomas
245 10 Development of a Thomson Scattering Diagnostic on a Pulsed
Power Machine and Its Use in Studying Laboratory Plasma
Jets Focusing on the Effect of Current Polarity
264 0 |c2019
300 1 online resource (177 pages)
336 text|btxt|2rdacontent
337 computer|bc|2rdamedia
338 online resource|bcr|2rdacarrier
500 Source: Dissertations Abstracts International, Volume: 81-
08, Section: B
500 Advisor: Hammer, Dave
502 Thesis (Ph.D.)--Cornell University, 2019
504 Includes bibliographical references
520 This research primarily focused on the development of a
collective Thomson scattering system for experiments on a
1 MA 100 ns pulsed power generator at Cornell University
(COBRA). This diagnostic is capable of determining, at a
minimum, the electron temperature, electron density and
the flow velocity in the plasma. It was used in
experiments on plasma jets created using a radial Al foil
(thin disk of foil) load on COBRA. These jets served as a
good load as they were long-lasting and at the center of
the experimental chamber. The first set of experiments
explored the rotation of the jet when an external magnetic
field is applied and found the jet to be rotating at about
20 km/s. During these experiments, it was discovered that
the Thomson scatter laser energy (10 J) was sufficient to
heat the 20 eV jet plasma by inverse bremsstrahlung. While
this did not affect the velocity measurements, it did
significantly affect the measured temperature of the
plasma. To better study this perturbation, a streak camera
was set up to measure the changing temperature during the
laser pulse. The plasma was found to be heated from about
20 to 80 eV in the first half of the laser pulse, before
cooling down due to the expansion of the plasma. We also
started developing a system to record the high-frequency
Thomson scattering spectral feature to measure the density
of the plasma. This showed some initial promising results
and suggested densities of at least 5 x 1018 cm−3.
Finally, using low enough laser energy to avoid laser
heating of the plasma, the effect of current polarity on
the plasma jets was studied experimentally. It was found
that while jets with a radial outward current flow were
denser and wider than jets with a radial inward current,
both jets had a similar electron temperature. These
experiments were also compared to extended
magnetohydrodynamic (XMHD) simulations. While experimental
jets had about the same width as those in the simulation,
they were found to be slightly colder and significantly
less dense than the simulations
533 Electronic reproduction.|bAnn Arbor, Mich. :|cProQuest,
|d2020
538 Mode of access: World Wide Web
650 4 Plasma physics
650 4 Applied physics
650 4 Electrical engineering
653 Hall effect
653 HEDP
653 Plasma jets
653 Thomson scattering
655 7 Electronic books.|2local
690 0759
690 0215
690 0544
710 2 ProQuest Information and Learning Co
710 2 Cornell University.|bApplied Physics
773 0 |tDissertations Abstracts International|g81-08B
856 40 |uhttp://pqdd.sinica.edu.tw/twdaoapp/servlet/
advanced?query=22621709|zclick for full text (PQDT)
912 PQDT
