Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 10 of 10 for “"vacuum arc"”.
-
Metal vapor vacuum arc switching
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 1984.
-
Charging of Macroparticles Ejected From a Pulsed Vacuum Arc
A pulsed vacuum arc discharge emits a plasma as well as macroparticles in the form of micron-sized molten droplets of cathode material. Due to their direction of flight and submicron to 100 mum diameter, these macroparticles often pose a contamination threat for both spacecraft-based thrusters, and …
-
Development of a MeVVA based beryllium-7 plasma source
… for a Malmberg-Penning trap based on Metal Vapor Vacuum Arc (MeVVA) ion source designs. Our primary intent with this MeVVA-type source is to create a confinable beryllium-7 (7-Be) plasma. 7-Be is a peculiar isotope due to its varying radioactive decay half-life in different electro-chemical …
-
Carbon thin films with enhanced properties from cathodic arc plasmas.
… using a filtered and unfiltered cathodic arcs are investigated. Firstly, the plasma properties of the filtered cathodic vacuum arc (FCVA) have been examined using planar and wire Langmuir probes in order to optimize the plasma throughput around the 90� bend. The knowledge of plasma …
-
Direct current hybrid vacuum breaker
… two DC hybrid switching techniques. The first is arc interruption based on current oscillation. The second is interruption without an arc, like with a voltage commutation approach. The main difference is whether or not the interruption mechanism deals with the arc. Interrupting the arc not only …
-
Effects of Xe ion irradiation of ZrN and the migration behaviour of implanted Eu
… thick were deposited on silicon substrates using vacuum arc deposition. Some of the deposited ZrN samples were individually implanted with Eu and Xe ions of energy 360 keV all to a uence of 1.0 1016 cm2, while others were irradiated with 167 MeV Xe ions to a uence of 6.77 1014 cm2. Both …
-
Carbide formation in a nickel-based superalloy during electron beam solid freeform fabrication
… Control material from a conventional vacuum arc remelted ingot with similar composition was also examined and plate-like carbides up to 40 [mu]m in length were noted. This is an indication of the enormous potential of the EBSFF process to refine the carbide morphology and size …
-
Development of PVD coating processes informed by plasma diagnostics.
… CrN coatings. Initially the project investigated vacuum arc plasma discharges used in the Hauzer HTC1000/ABS industrially sized coater. The attention was concentrated to the plasma pretreatment by low energy (1200 - 3600 eV) Cr ion implantation into substrates, which contributed to an enhanced …
-
Multilayer solar selective coatings for high temperature solar applications: from concept to design
… simulation, coating deposition using cathodic vacuum arc (CVA) and advanced characterization. The computer program CODE was used to simulate the reflectance spectra of different complete coating. Simulated reflectance spectra were compared with the measured reflectance of the deposited films to …
-
Properties and applications of metastable precious metal intermetallic compounds
… are also fascinating topics for scientific research. These materials have a long history, with gold and silver amongst the very earliest metals used by humans. Over the past millennia, the primary applications of the precious metals and their alloys have been in the ever-lucrative jewellery …