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Showing 1 to 12 of 12 for “"ion energy distribution"”.
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Construction of a gridded energy analyzer for measurements of ion energy distribution in the versatile toroidal facility
… Facility (VTF) at MIT's Plasma Science and Fusion Center provides a laboratory environment for studying ionospheric plasmas. Various plasma diagnostic devices have been created and used to study the VTF plasma since 1991. An accurate method for measuring VTF's ion characteristics has never been …
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Development and Test of a Permanent Magnet Helicon Thruster
… impulse of 1400 seconds. Analysis of the variation of beam power and ion temperature in the exhaust plume with variation of input power and vacuum pressure are presented. Preliminary tests were conducted using water as a propellant. Measurement of the ion energy distribution function shows a …
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Enhancing retarding potential analyzer energy measurements with micro-aligned electrodes
Plasmas are ionized gases, and constitute a large fraction of the known universe. For example, solar wind is a plasma that emanates from the sun reaching the Earth's magnetosphere. At times these ionized species cause beautiful auroral displays over the planet's magnetic poles. Moreover, when a …
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Studies on the ion-droplet mixed regime in colloid thrusters
Colloid thrusters working with mixtures of ions and droplets are gradually becoming an alternative technology for space micro-propulsion needs in missions requiring high position controllability, compactness and low power consumption. The mechanics of the colloid thruster emission process are …
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Experimental and theoretical characterization of a Hall thruster plume
… heritage of the Hall thruster, the interaction of its plume with the spacecraft remains an important integration issue. Because in-flight data fully characterizing the plume in the space environment are currently unavailable, laboratory measurements are often used to understand plasma …
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Development and characterization of a diverging cusped field thruster and a lanthanum hexaboride hollow cathode
… developed and undergone preliminary characterization. The design employs cusped magnetic fields arranged in a divergent fashion to confine electron flow to an anode while providing efficient acceleration of an ion beam, similar to traditional Hall type thrusters. The design, referred to as a …
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Mass-spectroscopy and modeling of capacitive coupled hydrogen plasmas
This work presents the characterization of a radio-frequency, capacitively coupled, symmetric, hydrogen plasma. Both steady-state operation and the time-prole of the afterglow when RF power is terminated are investigated. Fluxes of the hydrogen ions, H+ , H+2, H+3, at the grounded electrode are …
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Nearly Monoenergetic Positive Ion Beam with Self-Neutralized Space Charge Extracted from a Pulsed Plasma and Its Application
Space charge neutralization of an ion beam extracted from a plasma is crucial for advanced plasma processes which require precise control of the ion flux and the width of the ion energy distribution (IED). In previous studies, filaments thermionically emitting electrons were used for neutralizing …
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Magnetic mitigation of energetic ions for extreme ultraviolet lithography sources
… (EUV) light for lithography presents a solution. Switching to this wavelength would enable many of the expensive advanced techniques to be abandoned. It would also allow for a smaller resolution without as much reduction in depth-of-focus. However, EUV cannot be produced by lasers. Instead, …
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High power impulse magnetron sputtering (HIPIMS) : Fundamental plasma studies and material synthesis.
Physical vapour deposition (PVD) technology is widely used for deposition of coatings with applications in various industries; coatings in semiconductor industry, optical coatings or hard coatings mostly used in car and aerospace industries. In 1999 novel physical vapour deposition technology …
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Towards improving the quantum coherence in Ion microtraps
Ion traps have a number of applications in optical atomic clocks, quantum metrology and quantum information processing. Quantum coherence is essential in these applications, yet motional decoherence of ions remains a significant limitation. Experiments towards improving the quantum coherence of …
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A Novel Device for Energy Distribution Measurements in an RF Plasma Discharge
Made available in DSpace on 2017-07-06T18:55:37Z (GMT). No. of bitstreams: 3 Nguyen_Phi_L_MS.pdf: 81580042 bytes, checksum: 3c7b14f053dfe7315d8732f2a80e9f8d (MD5) Nguyen_Phi_L_MS_ABS.pdf: 501973 bytes, checksum: 470486c7d05ab468f109e27a45f04fc8 (MD5) license.txt: 4813 bytes, checksum: …