Numerical simulation of the Helicon Double Layer Thruster
... obtained by a helicon-source plasma expansion along a diverging magnetic field. Their findings can lead eventually to development of innovative space propulsion system.5–7 Similarities were met by independent researchers: Hairapetian,8 Cohen,9 Sun10, 11 and Plihon;12, 13 while a first 1D-MCC-PIC mod ...
... obtained by a helicon-source plasma expansion along a diverging magnetic field. Their findings can lead eventually to development of innovative space propulsion system.5–7 Similarities were met by independent researchers: Hairapetian,8 Cohen,9 Sun10, 11 and Plihon;12, 13 while a first 1D-MCC-PIC mod ...
Slide 1
... Hill et al., 1983]. To address this mystery we investigate an azimuthal heating cycle that might operate in the middle, non-dipolar magnetospheric region. This idea was first proposed by Goertz [1978]. In this cycle “magnetic pumping” energises plasma by azimuthal transport in magnetic field configu ...
... Hill et al., 1983]. To address this mystery we investigate an azimuthal heating cycle that might operate in the middle, non-dipolar magnetospheric region. This idea was first proposed by Goertz [1978]. In this cycle “magnetic pumping” energises plasma by azimuthal transport in magnetic field configu ...
Three-dimensional magnetized and rotating hot plasma equilibrium
... where the density and normalizing or "pseudo" density η are related via the generalized Maxwell-Boltzmann exponential factor κ that retains the poloidal dependence due to the centrifugal and gravitational potential, ...
... where the density and normalizing or "pseudo" density η are related via the generalized Maxwell-Boltzmann exponential factor κ that retains the poloidal dependence due to the centrifugal and gravitational potential, ...
Partially Ionized Plasmas - Harvard
... Ionization takes time to catch up to temperature changes The charge state distribution will imply that the plasma is cooler than it actually is The plasma is underionized ...
... Ionization takes time to catch up to temperature changes The charge state distribution will imply that the plasma is cooler than it actually is The plasma is underionized ...
Stellar Evolution
... • “A planetary nebula is the glowing relic of a dying, sun-like star.” • “The hourglass shapes of many planetary nebulae are produced by the expansion of a ‘fast stellar wind’ within a slowly expanding ’cloud’ which is denser near its equator than its poles.” • If so, where do the x-rays come from? ...
... • “A planetary nebula is the glowing relic of a dying, sun-like star.” • “The hourglass shapes of many planetary nebulae are produced by the expansion of a ‘fast stellar wind’ within a slowly expanding ’cloud’ which is denser near its equator than its poles.” • If so, where do the x-rays come from? ...
plasma
... and positively charged particles, called protons). Electrically neutral atoms have the same number of positive and negative electrical charges. When gases are exposed to lots of heat or radiation the atoms are split into a sea of positively charged ions and the negatively charged electrons, forming ...
... and positively charged particles, called protons). Electrically neutral atoms have the same number of positive and negative electrical charges. When gases are exposed to lots of heat or radiation the atoms are split into a sea of positively charged ions and the negatively charged electrons, forming ...
ppt - Fusion Technology Institute
... from a drastic increase in the deuteron screening potential in the crystalline structure of the metal targets at Ed ~ 1.0 keV, especially at a high deuteron current density where the ion density in the target can become quite large. ...
... from a drastic increase in the deuteron screening potential in the crystalline structure of the metal targets at Ed ~ 1.0 keV, especially at a high deuteron current density where the ion density in the target can become quite large. ...
M.Ishida_Future_HE_Mission2006 - X
... Accretion onto WD takes place through an optically thick Keplerian disc (T~105K). Hard X-rays are radiated from the Boundary Layer which is optically thin/geometrically thick with T~108K. The rotation speed of WD at its surface is usually much smaller than vK(R*) (~5000km/s). For settling do ...
... Accretion onto WD takes place through an optically thick Keplerian disc (T~105K). Hard X-rays are radiated from the Boundary Layer which is optically thin/geometrically thick with T~108K. The rotation speed of WD at its surface is usually much smaller than vK(R*) (~5000km/s). For settling do ...
Slide 1
... most H in ground state and thus does not contribute much to absorption need 13.6 eV (121.6 nm) to get H in first excited state 1939- about one in 107 H’s are H–, and need only 0.75 eV to remove extra electron 1653 nm (Saha relation) so H– can account for absorption down to very long ...
... most H in ground state and thus does not contribute much to absorption need 13.6 eV (121.6 nm) to get H in first excited state 1939- about one in 107 H’s are H–, and need only 0.75 eV to remove extra electron 1653 nm (Saha relation) so H– can account for absorption down to very long ...
(1) and
... Kinematic energy (=1/2Mv2) of Ia and CC SN are ~1051 erg. A large fraction should be converted to the thermal energy: kT = 3mv2/16 However observed thermal energy (kTe) is ~1049 erg This large missing energy would be contained in protons and other ions (the ion temperature kTi). But, no evidence is ...
... Kinematic energy (=1/2Mv2) of Ia and CC SN are ~1051 erg. A large fraction should be converted to the thermal energy: kT = 3mv2/16 However observed thermal energy (kTe) is ~1049 erg This large missing energy would be contained in protons and other ions (the ion temperature kTi). But, no evidence is ...
Magnetic field generation by sound waves in the solar atmosphere
... stage where there is an extremely efficient current generation (see below). We give numerical estimates pertaining to a characteristic point in the transition region between the chromosphere and the corona. We set the plasma density n and temperature T, respectively, equal to 10" cm-3 and 10 eV. ...
... stage where there is an extremely efficient current generation (see below). We give numerical estimates pertaining to a characteristic point in the transition region between the chromosphere and the corona. We set the plasma density n and temperature T, respectively, equal to 10" cm-3 and 10 eV. ...
Plasma Seminar 4/23/07 "Negative Ion Plasmas"
... most H in ground state and thus does not contribute much to absorption need 13.6 eV (121.6 nm) to get H in first excited state 1939- about one in 107 H’s are H–, and need only 0.75 eV to remove extra electron 1653 nm (Saha relation) so H– can account for absorption down to very long ...
... most H in ground state and thus does not contribute much to absorption need 13.6 eV (121.6 nm) to get H in first excited state 1939- about one in 107 H’s are H–, and need only 0.75 eV to remove extra electron 1653 nm (Saha relation) so H– can account for absorption down to very long ...
hybrid
... approximating the spherical surface as in global MHD simulations. • Cold ion fluid in r<6.5RE; fully kinetic ions outside. nc=1000/r3[1-tanh(r-6.5)] ...
... approximating the spherical surface as in global MHD simulations. • Cold ion fluid in r<6.5RE; fully kinetic ions outside. nc=1000/r3[1-tanh(r-6.5)] ...
Ultracold Plasmas
... - Laser cool atoms to slightly above sub-milikelvin temperatures. - Trap the laser-cooled atoms using Magneto Optical trap. - Photoionize , using laser light near the ionization threshold. - Diagnostics with applied electric fields. ...
... - Laser cool atoms to slightly above sub-milikelvin temperatures. - Trap the laser-cooled atoms using Magneto Optical trap. - Photoionize , using laser light near the ionization threshold. - Diagnostics with applied electric fields. ...
study guide first semester chemistry
... 1. Write the balanced equation for the following: (include the state of each reactant and product) a. magnesium reacts with nitrogen to produce magnesium nitride. b. silver nitrate reacts with copper to form copper(II) nitrate and silver. c. ammonia reacts with hydrochloric acid to form ammonium ch ...
... 1. Write the balanced equation for the following: (include the state of each reactant and product) a. magnesium reacts with nitrogen to produce magnesium nitride. b. silver nitrate reacts with copper to form copper(II) nitrate and silver. c. ammonia reacts with hydrochloric acid to form ammonium ch ...
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... A solar wind proton with streaming velocity of 300 km s-‐1 along a magnetic field of 5 x 10-‐9 T. c) A 1 keV He+ ion in the solar atmosphere near a sunspot, where the m ...
... A solar wind proton with streaming velocity of 300 km s-‐1 along a magnetic field of 5 x 10-‐9 T. c) A 1 keV He+ ion in the solar atmosphere near a sunspot, where the m ...
Plasma densities from spacecraft potential
... The potential near a probe (Vn) is influenced by the potential of the long radial wire booms that are at spacecraft potential. According to modelling, for Debye lengths longer than the probe system, can (Vn – V0) be lifted to be approximately 18 % of (Vs – V0), where Vs is the spacecraft potential ...
... The potential near a probe (Vn) is influenced by the potential of the long radial wire booms that are at spacecraft potential. According to modelling, for Debye lengths longer than the probe system, can (Vn – V0) be lifted to be approximately 18 % of (Vs – V0), where Vs is the spacecraft potential ...
Langmuir probe
A Langmuir probe is a device used to determine the electron temperature, electron density, and electric potential of a plasma. It works by inserting one or more electrodes into a plasma, with a constant or time-varying electric potential between the various electrodes or between them and the surrounding vessel. The measured currents and potentials in this system allow the determination of the physical properties of the plasma.