Dirac`s wave mechanical theory of the electron and its field
... wave optics based on analytical dynamics and Fermat’s principle. The function, which he denotes by ψ, which ought to govern the entire atomic realm as far as quantum-like processes are concerned, is distributed over the entire space and has a completely field theoretical character. Moreover, he gave ...
... wave optics based on analytical dynamics and Fermat’s principle. The function, which he denotes by ψ, which ought to govern the entire atomic realm as far as quantum-like processes are concerned, is distributed over the entire space and has a completely field theoretical character. Moreover, he gave ...
Theory and Experimental Results of a New Diamond Surface
... triple junction at the intersection of metal and diamond interfaces in vacuum with the negative electron affinity (NEA) of the diamond surface. This new surface-emission mechanism is compared to two common cathode mechanisms—geometric electric-field enhancement and Schottky-diode electricfield enhan ...
... triple junction at the intersection of metal and diamond interfaces in vacuum with the negative electron affinity (NEA) of the diamond surface. This new surface-emission mechanism is compared to two common cathode mechanisms—geometric electric-field enhancement and Schottky-diode electricfield enhan ...
high-energy emission and cosmic rays from gamma
... This paper is devoted to the analysis of particle acceleration in gamma-ray bursts (GRBs) and its radiative consequences. Therefore, we get on one hand constraints on the physics and on the other hand possible signatures of particle acceleration that could be recorded by new gamma-ray instruments. I ...
... This paper is devoted to the analysis of particle acceleration in gamma-ray bursts (GRBs) and its radiative consequences. Therefore, we get on one hand constraints on the physics and on the other hand possible signatures of particle acceleration that could be recorded by new gamma-ray instruments. I ...
Direct observation of electron propagation and dielectric screening
... Direct (time-domain) access to these electronic and optical wave packets promises a unique insight into the photoelectric effect, including underlying electron propagation and phenomena as fundamental as dielectric screening of light fields at solid surfaces. Here we show that this can be achieved b ...
... Direct (time-domain) access to these electronic and optical wave packets promises a unique insight into the photoelectric effect, including underlying electron propagation and phenomena as fundamental as dielectric screening of light fields at solid surfaces. Here we show that this can be achieved b ...
InPAC2013_245_Vinit_Kumar
... vicinity of the dielectric surface. Under suitable conditions, powerful coherent terahertz radiation can be produced using this device, which is called as Cherenkov Free-Electron Laser (CFEL). In this paper, we present an analysis of CFEL driven by a two dimensional flat electron beam travelling clo ...
... vicinity of the dielectric surface. Under suitable conditions, powerful coherent terahertz radiation can be produced using this device, which is called as Cherenkov Free-Electron Laser (CFEL). In this paper, we present an analysis of CFEL driven by a two dimensional flat electron beam travelling clo ...
DESY Summer Student Program 2011 Simulations of beam
... to develop electron sources which can produce high density electron beams with small transverse emittance and with short bunch length. In order to optimize and characterize the beam quality, ASTRA code[1] was developed to simulate electron beam properties from the photocathode.[2] ASTRA (A Space Cha ...
... to develop electron sources which can produce high density electron beams with small transverse emittance and with short bunch length. In order to optimize and characterize the beam quality, ASTRA code[1] was developed to simulate electron beam properties from the photocathode.[2] ASTRA (A Space Cha ...
Electron beam collimation with a 40000 tip metallic double
... For the practical application of FEAs it is important to prepare an array with uniform nanotip apex distribution. Due to the exponential sensitivity of the field emission current on the electric field at the emitter apexes, even a small nonuniformity of the emitter tip apex radius of curvature rtip ...
... For the practical application of FEAs it is important to prepare an array with uniform nanotip apex distribution. Due to the exponential sensitivity of the field emission current on the electric field at the emitter apexes, even a small nonuniformity of the emitter tip apex radius of curvature rtip ...
Student worksheet on..
... There are now many different types and sub-types of microscopes—or should we now say nanoscopes? Scientists now have, for example, scanning electron microscopes (SEMs), scanning probe microscopes (SPMs), atomic force microscopes (AFMs), and scanning tunneling microscopes (STMs). The new worlds of ev ...
... There are now many different types and sub-types of microscopes—or should we now say nanoscopes? Scientists now have, for example, scanning electron microscopes (SEMs), scanning probe microscopes (SPMs), atomic force microscopes (AFMs), and scanning tunneling microscopes (STMs). The new worlds of ev ...
Introduction
... the phenomena in AC-PDP. The new panelmanufacture time is reduced through the numerical benchmark such as changes in cell size. We present the coplanar geometry and the modified geometries with the coplanar geometry. While the fluid simulation has an advantage of short computing time, it has the sho ...
... the phenomena in AC-PDP. The new panelmanufacture time is reduced through the numerical benchmark such as changes in cell size. We present the coplanar geometry and the modified geometries with the coplanar geometry. While the fluid simulation has an advantage of short computing time, it has the sho ...
Particle acceleration in Supernova Remnants - CEA-Irfu
... Fit: synchrotron from a cut-off electrons power law (SRCUT) plus thermal NEI emission Normalisation of the synchrotron component fixed using the radio data Only the cut-off frequency was left free. ...
... Fit: synchrotron from a cut-off electrons power law (SRCUT) plus thermal NEI emission Normalisation of the synchrotron component fixed using the radio data Only the cut-off frequency was left free. ...
Nanosecond pulsed field emission from single
... generate the pulsed accelerating diode voltage.33 Figure 4 shows the accelerating voltage wave form of the diode gun, as measured by a calibrated capacitive divider.33 The full width half maximum 共FWHM兲 duration of the first negative pulse peak maximum was ⬃250 ns. The accelerating voltage amplitude ...
... generate the pulsed accelerating diode voltage.33 Figure 4 shows the accelerating voltage wave form of the diode gun, as measured by a calibrated capacitive divider.33 The full width half maximum 共FWHM兲 duration of the first negative pulse peak maximum was ⬃250 ns. The accelerating voltage amplitude ...
Basic Physical Processes and Principles of Free Electron Lasers
... undulator parameters. In addition to its tunability F ELs high peak power and flexible pulse structure makes FEL a very attractive device, justified by the growing number of potential application depending on the region of radiation. The most compelling case for FLE facilitites starts with the far i ...
... undulator parameters. In addition to its tunability F ELs high peak power and flexible pulse structure makes FEL a very attractive device, justified by the growing number of potential application depending on the region of radiation. The most compelling case for FLE facilitites starts with the far i ...
using standard prb s
... used to determine the charge state of the defects. However, only a limited number of defects can be satisfactorily described by the Poole-Frenkel theory. An electric field dependence different from that expected from the Poole-Frenkel theory has been repeatedly reported in the literature, and no una ...
... used to determine the charge state of the defects. However, only a limited number of defects can be satisfactorily described by the Poole-Frenkel theory. An electric field dependence different from that expected from the Poole-Frenkel theory has been repeatedly reported in the literature, and no una ...
Differential Electron Emission for Single and Multiple Ionization of
... recoil to binary intensities needed to be approximately equal at 1 eV and slowly decrease to 1=3 at 20 eV. In addition, to match the 2.4 eV data it was necessary to shift the positions of the binary and recoil peaks to smaller angles by 10 and 40 , whereas to match the 7.3 eV data a 10 shift to l ...
... recoil to binary intensities needed to be approximately equal at 1 eV and slowly decrease to 1=3 at 20 eV. In addition, to match the 2.4 eV data it was necessary to shift the positions of the binary and recoil peaks to smaller angles by 10 and 40 , whereas to match the 7.3 eV data a 10 shift to l ...
Determination of Argon metastable density from relative emission
... 419.8 nm intensity ratio for a larger range of E/N and nm/ng values using the cross section data for 5 mTorr. The plot in Fig. 5 shows the results of this calculation. With this plot, given a measured E/N and a measured 420 nm to 419.8 nm intensity ratio, the ratio of the metastable to ground state ...
... 419.8 nm intensity ratio for a larger range of E/N and nm/ng values using the cross section data for 5 mTorr. The plot in Fig. 5 shows the results of this calculation. With this plot, given a measured E/N and a measured 420 nm to 419.8 nm intensity ratio, the ratio of the metastable to ground state ...
CHAPTER 27 Continuum Emission Mechanisms Continuum
... ν1 + ν2 = νtr = ∆Etr /h, where ∆Etr is the energy difference associated with the transition. The most probable configuration is the one in which ν1 = ν2 = νtr /2, but all configurations that satisfy the above energy conservation are possible; they become less likely the larger |ν1 − νtr /2|, result ...
... ν1 + ν2 = νtr = ∆Etr /h, where ∆Etr is the energy difference associated with the transition. The most probable configuration is the one in which ν1 = ν2 = νtr /2, but all configurations that satisfy the above energy conservation are possible; they become less likely the larger |ν1 − νtr /2|, result ...
12.50, £6.25. GA Jones. Pp. 175. London" Edward
... vast amount of existing information about electron microscopy and its applications, with special emphasis on the problems in solid-state physics. The resulting book contains fundamental information about the principles on which electron microscopy is based, the design and construction of electron mi ...
... vast amount of existing information about electron microscopy and its applications, with special emphasis on the problems in solid-state physics. The resulting book contains fundamental information about the principles on which electron microscopy is based, the design and construction of electron mi ...
pdf
... Recently, a number of groups have demonstrated strong optical field emission from both isolated metallic tips, and arrays of tips with nanometer scale tip dimensions [8,10,11,14]. One such report by Bormann et al. found that the charge yield produced by optically actuated electron emission from a s ...
... Recently, a number of groups have demonstrated strong optical field emission from both isolated metallic tips, and arrays of tips with nanometer scale tip dimensions [8,10,11,14]. One such report by Bormann et al. found that the charge yield produced by optically actuated electron emission from a s ...
Ongoing: Ion-Enhanced Field Emission
... • At the microscale, the electric field can be very high (~10-100 V/μm) such that electrons tunnel from the cathode – electron field emission acts as an additional charge source – mechanism responsible for deviation from Paschen’s curve in microscale gaps – at pressure, ions in the electrode gap aff ...
... • At the microscale, the electric field can be very high (~10-100 V/μm) such that electrons tunnel from the cathode – electron field emission acts as an additional charge source – mechanism responsible for deviation from Paschen’s curve in microscale gaps – at pressure, ions in the electrode gap aff ...
tuppp045
... turning magnets after the first undulator in FELWI can be used in this case for making faster electrons running over a longer trajectory than the slower ones [2]. This is the negative-dispersion condition which is necessary for getting amplification without inversion [3]. It’s clear that the describ ...
... turning magnets after the first undulator in FELWI can be used in this case for making faster electrons running over a longer trajectory than the slower ones [2]. This is the negative-dispersion condition which is necessary for getting amplification without inversion [3]. It’s clear that the describ ...
Tunneling - a primer
... Tunneling is exponentially suppressed with barrier width. Factoid: metal-metal tunneling current in vacuum (or air) decays with distance roughly like 1 order of magnitude per Angstrom (!). One of your homework problems: what is the probability of a Volkswagon Beetle tunneling through a speed bump? ...
... Tunneling is exponentially suppressed with barrier width. Factoid: metal-metal tunneling current in vacuum (or air) decays with distance roughly like 1 order of magnitude per Angstrom (!). One of your homework problems: what is the probability of a Volkswagon Beetle tunneling through a speed bump? ...
PDF version - Uniwersytet Gdański
... 1. Point charges in electric and magnetic fields: a) characteristics of electric and magnetic fields; b) motion of a charged particle in an electric and magnetic field: • electrostatic force, • potential energy of a charged particle in an electrostatic field, • Lorentz force; c) magnetic fields indu ...
... 1. Point charges in electric and magnetic fields: a) characteristics of electric and magnetic fields; b) motion of a charged particle in an electric and magnetic field: • electrostatic force, • potential energy of a charged particle in an electrostatic field, • Lorentz force; c) magnetic fields indu ...
atu_p_galla - Arkansas Space Grant Consortium
... J.W. Beams – In 1930 confirmed Thompson’s observations of the speed of the pulse and had a qualitative explanation for it. He stated that the gas behind the pulse was electrically conducting so the pulse carried the potential of the discharge electrode where the potential was applied. He theorized t ...
... J.W. Beams – In 1930 confirmed Thompson’s observations of the speed of the pulse and had a qualitative explanation for it. He stated that the gas behind the pulse was electrically conducting so the pulse carried the potential of the discharge electrode where the potential was applied. He theorized t ...