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Visar resultat 1 - 5 av 9 uppsatser som matchar ovanstående sökkriterier.

1. 1. Vacuum Chamber Adaptation for Low-Power Electric Propulsion Testing : Optimizing Anode Configuration and Electrical Interface for Hollow Cathode Testing, and Conceptualizing a Setup for Field Emission Electric Propulsion Testing

   Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

   Författare :Therese Bäckström; [2023]
   Nyckelord :Electric Propulsion; Field Emission Electric Propulsion Testing; FEEP Testing; Thruster Testing; Heaterless Hollow Cathode Testing; HHCTesting; Cathode Testing; Anode Design; Anode Configuration; Electrical Interface; Elektrisk Framdrivning; Fältjonisationsframdrivningstestning; Framdrivningstestning; Värmelös Hålkatodstestning; Katodtestning; Anoddesign; Anodkonfiguration; Elektriskt Gränssnitt;

   Sammanfattning : Electric Propulsion (EP) is widely acknowledged as a crucial technology for future space missions, offering significant propellant savings and enabling exploration of planetary missions with smaller spacecraft (s/c). For precise attitude control of these smaller spacecraft, Field Emission Electric Propulsion (FEEP) has emerged as a favorable option due to its exceptional thrust controllability. LÄS MER

3. 2. Design of a vacuum chamber for cathode testing and low power Hall Effect Thrusters : Collaborative project with OHB Sweden AB

   Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

   Författare :Andrea Martinez Sanz; [2023]
   Nyckelord :Vacuum chamber; adaptability; hollow cathode test; fluid ground support equipment; low power Hall Effect Thrusters test; Vakuumkammare; anpassningsförmåga; ihålig katod testa; flytande markstödutrustning; låg effekt Hall Effect Thrusters testa;

   Sammanfattning : Testing of hardware to be used in space sometimes involves using vacuum chambers. The need to test hollow cathodes, used as neutralizers for some Electric Propulsion Thrusters, and low power Hall Effect Thrusters at OHB Sweden requires a vacuum chamber to be upgraded. LÄS MER

4. 3. Hyperfine structure measurements in scandium for IR spectroscopy

   Master-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation; Lunds universitet/Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation

   Författare :Felix van Deelen; [2017]
   Nyckelord :Astrophysics; Atomic Data; Hyperfine Structure; Stellar Spectroscopy; Physics and Astronomy;

   Sammanfattning : Stellar abundances are important for understanding the chemical evolution of galaxies and provide us with constraints on stellar evolution and supernova nucleosynthesis. To determine stellar abundances accurately, atomic data is crucial. This data is incomplete for many elements, especially in the infrared region. LÄS MER

5. 4. Low–voltage External Discharge Plasma Thruster and Hollow Cathodes Plasma Plume Diagnostics Utilising Electrostatic Probes and Retarding Potential Analyser

   Master-uppsats, Luleå tekniska universitet/Rymdteknik

   Författare :George-Cristian Potrivitu; [2016]
   Nyckelord :space electric propulsion; in-space advanced propulsion technology; Hall effect thruster; hollow cathode; wall-less Hall thruster; external discharge plasma thruster; single Langmuir probe; double Langmuir probe; emissive probe; retarding potential analyzer; plume plasma diagnostics; low-voltage Hall thruster; high-current hollow cathode; plasma parameters; propulsion electrique pour l espace; cathode creuse à fort courant; propulseur à décharge externe de plasma; propulseur à effet Hall à basse tension; techniques de diagnostic du plasma; sonde de Langmuir simple; sonde de Langmuir double; sonde émissive; analyseur à potentiel retardé;

   Sammanfattning : The present thesis is the result of a research period at the Institute of Space and Astronautical Science of the Japanese Aerospace Exploration Agency, ISAS/JAXA within Funaki Laboratory of the Department of Space Flight Systems that followed the path of plume plasma diagnostics for space electric propulsion drives. During the experimental studies two high-current hollow cathodes and an innovative prototype of a low-voltage fully external discharge plasma thruster (XPT) had their plasma plumes diagnosed using electrostatic probes and retarding potential analyser (RPA). LÄS MER

7. 5. Tunable diode laser frequency stabilization and its applications in temperature measurement

   Master-uppsats, Lunds universitet/Förbränningsfysik; Lunds universitet/Fysiska institutionen

   Författare :Ali Rabbani; [2015]
   Nyckelord :Temperature measurements; Frequency stabilization; Physics and Astronomy;

   Sammanfattning : The frequency of two external cavity diode lasers tuned to the two transitions at 410 nm and 451 nm of indium are stabilized in this thesis. A hollow cathode lamp of indium atoms is used as a low pressure source of indium atoms in the locking process. LÄS MER