PDF Publication Title:
Text from PDF Page: 365
Hall Thrusters 355 0 −10 −20 −30 −40 −50 −60 −70 −80 −90 −100 0 5 10 15 20 25 30 35 40 45 50 Electron Temperature (eV) Fig. 7-13. Sheath potential versus electron temperature for two materials. The sheath transitions to space-charge limited where the dashed lines intersect the potential curves. Space Charge Limited Emission No Emission Al2O3 BNSiO2 No Emission (γ = 0) emission has been neglected. Equation (7.3-45) can be rewritten in terms of the total ion current to the wall as M 1/2 e /kT kTe P w = I i w 2 m e s e 2 e + ( E s ) . ( 7 . 3 - 4 6 ) For the case of space charge–limited secondary electron emission, the sheath potential is s = o = 1.02TeV , and the ion energy is E = 0.58 TeV in order to satisfy the Bohm condition. Equation (7.3-45) predicts the maximum heat loading to the wall in the presence of a Maxwellian electron distribution and secondary electron emission from the wall, which is the dominant power loss mechanism in dielectric-wall Hall thrusters. If the electron distribution function is non-Maxwellian, the heat load to the wall can differ from that predicted by Eq. (7.3-45). In the case of TAL thrusters, the channel wall is metallic and biased to the cathode potential. This eliminates the zero-net current condition found on the insulating walls of dielectric-channel Hall thrusters and used to determine the local heat flux in Eq. (7.3-45). The electron flux to the cathode-biased TAL channel wall is negligible, and the secondary yield for metals is much lower than for insulators, so the secondary electron emission by the wall in TAL thrusters has little effect on the thruster operation. In addition, the plasma tends to be localized near the channel center by the anode design and gas feed geometry. The plasma then tends to be in poor contact with the guard rings at Sheath Potential (V)PDF Image | Fundamentals of Electric Propulsion: Ion and Hall Thrusters
PDF Search Title:
Fundamentals of Electric Propulsion: Ion and Hall ThrustersOriginal File Name Searched:
Goebel__cmprsd_opt.pdfDIY PDF Search: Google It | Yahoo | Bing
NFT (Non Fungible Token): Buy our tech, design, development or system NFT and become part of our tech NFT network... More Info
IT XR Project Redstone NFT Available for Sale: NFT for high tech turbine design with one part 3D printed counter-rotating energy turbine. Be part of the future with this NFT. Can be bought and sold but only one design NFT exists. Royalties go to the developer (Infinity) to keep enhancing design and applications... More Info
Infinity Turbine IT XR Project Redstone Design: NFT for sale... NFT for high tech turbine design with one part 3D printed counter-rotating energy turbine. Includes all rights to this turbine design, including license for Fluid Handling Block I and II for the turbine assembly and housing. The NFT includes the blueprints (cad/cam), revenue streams, and all future development of the IT XR Project Redstone... More Info
Infinity Turbine ROT Radial Outflow Turbine 24 Design and Worldwide Rights: NFT for sale... NFT for the ROT 24 energy turbine. Be part of the future with this NFT. This design can be bought and sold but only one design NFT exists. You may manufacture the unit, or get the revenues from its sale from Infinity Turbine. Royalties go to the developer (Infinity) to keep enhancing design and applications... More Info
Infinity Supercritical CO2 10 Liter Extractor Design and Worldwide Rights: The Infinity Supercritical 10L CO2 extractor is for botanical oil extraction, which is rich in terpenes and can produce shelf ready full spectrum oil. With over 5 years of development, this industry leader mature extractor machine has been sold since 2015 and is part of many profitable businesses. The process can also be used for electrowinning, e-waste recycling, and lithium battery recycling, gold mining electronic wastes, precious metals. CO2 can also be used in a reverse fuel cell with nafion to make a gas-to-liquids fuel, such as methanol, ethanol and butanol or ethylene. Supercritical CO2 has also been used for treating nafion to make it more effective catalyst. This NFT is for the purchase of worldwide rights which includes the design. More Info
NFT (Non Fungible Token): Buy our tech, design, development or system NFT and become part of our tech NFT network... More Info
Infinity Turbine Products: Special for this month, any plans are $10,000 for complete Cad/Cam blueprints. License is for one build. Try before you buy a production license. May pay by Bitcoin or other Crypto. Products Page... More Info
| CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com | RSS | AMP |