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.
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Showing 1 to 20 of 120 for “"vacuum chamber"”.
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Thermal Vacuum Chamber Refurbishment and Analysis
… way to mitigate this risk is to use a thermal vacuum chamber (TVAC). The chamber is designed to resemble a space environment by reducing the pressure within the chamber to 1e-6 Torr. The differentiating factor between a vacuum chamber and a thermal vacuum chamber is the ability for the TVAC to …
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Refurbished and 3D Modeled Thermal Vacuum Chamber
… includes acoustics, vibrations, and thermal vacuum. Cal Poly’s Space Environments Lab is equipped with multiple vacuum chambers, but no thermal vacuum chamber. The purpose of this thesis is to incorporate an ATS Chiller system with the HVEC vacuum chamber so students are able to experiment …
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Small scale vacuum chamber for general use
For this thesis a small scale vacuum chamber assembly was designed and fabricated. This chamber's purpose is to provide high quality vacuum conditions for a variety of samples. Often these samples are in need of precise temperature control. An ultra-high vacuum remains the best environment to …
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Ionospheric Simulator (IonSim): Simulating Ionospheric conditions in a vacuum chamber
… space-borne instruments inside a laboratory vacuum chamber. Hot filaments are used to thermionically emit electrons inside the source. These electrons collisionally ionize neutral particles inside the source. Guided by ion-optics simulations, the ion and the electron trajectories inside the …
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The vacuum chamber in the interaction region of particle colliders : a historical study and developments implemented in the LHCb experiment at CERN
El colisionador de protenes actualmente en construcción en el CERN llamado LHC (Large Hadron Collider) se convertirá en el más potente acelerador jamas construido con una energía por protón de 7 TeV. Se prevé que esta en operación en 2007. Constará de 4 grandes experimentos uno de los cuales, LHCb, …
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Validation and Characterization of a Laboratory Ion Source for Testing Thermal Space-Plasma Instruments
… to stimulate thermal plasma instruments in a vacuum chamber. This dissertation presents the mechanical design of the source, simulations of the potentials and charged particle trajectories in and around the source, and vacuum chamber measurements of the emitted ion beam. Once the ion source is …
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Condensation heat flux measurements in ambient conditions on superhydrophobic nanostructured surfaces
… surface without the need for a controlled vacuum environment. By measuring heat flux within an individual droplet and multiple droplets within a surface, we show that it is possible to measure heat flux of a surface without the need for expensive equipment. As a means of validating these …
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The design and characterization of a microcalorimeter to aid drug discovery
… to transduce the signal from a heat event. A vacuum chamber improved the sensitivity of the sensor by approximately an order of magnitude by significantly reducing the losses due to air friction in the resonant sensor. Additional components such as a position sensor, temperature controlled …
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Impact of Lens Angle and Nozzle Geometry on Aerodynamic Focusing: A Numerical Study
… on particle terminal trajectories into the vacuum chamber. The nozzle has a cylindrical constriction upstream of the exit orifice. Several nozzle radial aspect ratios and lengths of the constriction were simulated in a two-dimensional axisymmetric domain. The nozzle geometry that generates …
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Cryogenic heat pipe for cooling high temperature superconductors with application to Electromagnetic Formation Flight Satellites
… model a single coil in space and a coil inside a vacuum chamber. In addition, the research in this thesis investigates the design, operation, and testing of a cryogenic heat pipe. The heat pipe uses nitrogen as a working fluid and a stainless steel mesh as the wicking structure. As a proof of …
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Design and Characterization of a Dust Injector for Future Studies of Tungsten Dust in the STOR-M Plasma
… and dust particles are injected into the test vacuum chamber under various dust injector parameters. Vacuum chamber pressures range from 10−4 - 10−5 Torr, which is within the operation range of STOR-M. These particles are then imaged with a high-speed camera via laser light scattering. …
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Effects of Atomic Oxygen on Outgassing of Silicone Materials
… is rare and not standardized. This thesis used a vacuum chamber intended to determine the outgassing properties of materials using ASTM E595 and another vacuum chamber intended to determine how materials are affected by atomic oxygen using ASTM E2089 to determine how atomic oxygen affects …
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Propeller-Driven Rotor Twirl Phenomenon: Hover Performance, Dynamics, and Controls
… rotor dynamics were investigated in two vacuum chamber experiments, as vacuum chambers remove aerodynamic effects and allow for only rotor-propeller inertial interactions to be studied. The first vacuum chamber experiment measured propeller flapping motion on an articulated propeller. The …
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Probing the liquid-vapor interface in microstructured heat exchangers
… include: design and fabrication of a custom vacuum chamber faceplate and the investigation of the liquid meniscus shape on microstructured devices. The faceplate for the vacuum chamber consisted of two metal components that serve to house and seal a viewport. Addition of the viewport to the …
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Experimental Studies of Spacecraft Plasma Interactions: Facility Characterization and Initial Measurements
… to characterize the plasma environment of a new vacuum chamber facility at Virginia Tech and to perform initial measurements of plasma flow field for studying spacecraft-plasma interactions using this facility. An argon plasma environment was created using a hot filament cathode plasma source. …
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Design and construction of a cyclotron capable of accelerating protons to 2 MeV
… confine particles to a spiral flight path in a vacuum chamber. An applied electrical field accelerates these particles to high energies, typically on the order of mega-electron volts. This cyclotron can be used by students in the Department of Nuclear Engineering to perform experiments with low …
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Investigation of the Structure of Alkyne Self-Assembled Monolayers on Gold and the Development of Matrix-Enhanced Secondary Ion Mass Spectrometry Methods
… FTIR) spectrometer, an optical pathway and a vacuum chamber. The RAIRS system is designed to investigate in situ the interaction of vapor-deposited metals and gases, such as CVD precursors, with organic thin films, and so a vacuum chamber is required. To accommodate the vacuum chamber, an …
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Rapid Prototyping of a Directly Heated Thermionic Triode Using 3D Printing Techniques
… electrodes. The triode was characterized in a vacuum chamber to extract µ, its intrinsic gain, for several operating points when the grid was biased to 5 V. A maximum µ just below 25 was measured when the anode was biased at 40 V and the current through the cathode filament was 55 mA.
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Surface Enhanced Raman Scattering Studies in Ultrahigh Vacuum
… These studies were performed in an ultrahigh vacuum chamber. This enhancement is similar to that observed off silver electrodes in electrochemical cells. The enhancement is destroyed by room temperature annealing of our films, so we infer that the surface roughness inherent in our evaporation …
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Grain Nucleation and Growth on Amorphous Silicon
… was not possible due to the limitations of the vacuum chamber conditions and also the fragility of many of our amorphous silicon films.
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