PDF Publication Title:
Text from PDF Page: 280
Hollow Cathodes 269 where = ie / in . Combining Eq. (6.4-32), which is known as the generalized Ohm’s law, with the sum of the ion and electron continuity equations, (Je +Ji)=0, gives the particle balance equation, = (nkTe)+J 1 ei , ne i en+ ei where the electric field is E = . The total resistivity in Eq. (6.4-34) is given by combining Eqs. (6.4-9) and (6.4-10): = m( en + ei). ne2 the (6.4-33) (6.4-34) plasma in (6.4-35) These equations have been used in a full 2-D code [5] to find the plasma density, temperature, and potential in the insert region for the NSTAR discharge operating conditions of 12 A and 4.25 sccm. Utilizing thermionic emission from the insert surface, described by Eq. (6.3-4), with temperatures measured by Polk [33], and applying the proper boundary conditions, the plasma density profile along the axis of symmetry is compared with the laboratory measurement in Fig. 6-15. The 12-A net cathode current was found to result from almost 32-A electron emission by the insert countered by 20 A of plasma (thermal) electron current back to the insert and the orifice plate. The particle balance in the insert is shown in Table 6-2, where only about one-half ampere of the net cathode current is due to ionization of the xenon gas. This is consistent with the previous analysis used to obtain the exponential density scale lengths. The 2-D code adequately describes what is happening in the cathode insert region. For example, the numerical results in Table 6-2 capture the 2-D effects upstream of the cathode orifice, predicting a density profile that is consistent with the data [2] shown in Fig. 6-16. The code’s predictions of the electron temperature and plasma potential are also close to the measured values in the emission zone, which extends less than about 0.5 cm upstream of the orifice entrance in the NSTAR cathode. Figure 6-16(a) shows that the plasma density falls radially, as expected, toward the insert wall. The 2-D plasma potential contours for this case are also shown in Fig. 6-16(b). Good agreement with the measurements has been achieved with this model for larger cathodes as well, such as with the 1.5-cm-diameter NEXIS cathode [5].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 (Standard Web Page)