Full-text resources of PSJD and other databases are now available in the new Library of Science.
Visit https://bibliotekanauki.pl
Preferences help
Polish version English version Language
enabled [disable] Abstract
Number of results

Results found: 6

Number of results on page
first rewind previous Page / 1 next fast forward last

Search results

Search:
in the keywords:  41.60.-m
help Sort By:

help Limit search:
first rewind previous Page / 1 next fast forward last
1
Content available remote

Axial Energy Distribution in Disc-Shaped Tantalum and Aluminium Bremsstrahlung Conversion Targets

100%
Williams T.
Acta Physica Polonica A
|
2009
|
vol. 115
|
issue 6
1180-1182
EN
The axial distribution of energy deposited in bremsstrahlung conversion targets is modelled using the Monte Carlo N-Particle (MCNP™) code. Systems comprising a disc-shaped target, segmented axially, and a point source of paraxial, monoenergetic electrons (2, 7, 10, or 14 MeV) are considered. Thick tantalum and aluminium targets and also tantalum targets of optimum thickness are modelled. Energy density, as a function of depth within the target, is found to depend on overall target thickness and to exhibit a maximum value at a particular depth. The far-field radiation polar diagram is calculated for X-rays exiting the target through its output face.
2
Content available remote

Generation of Terahertz Radiation by Large-Aperture Photoconductive Antennas in Condition of a High Level Excitation

100%
Trukhin V., Buyskikh A.
Acta Physica Polonica A
|
2011
|
vol. 119
|
issue 2
206-209
EN
Theoretical and experimental results about generation coherent terahertz (THz) radiation in photoconductive medium in condition of a high level excitation are presented. Employing self-consistent analytical approach to the set of non-equilibrium Boltzmann equation for charge carriers and Maxwell equations for electromagnetic radiation we have studied the radiation phenomena in non-equilibrium e-h plasma excited in the photoconductive gap of terahertz radiating large-aperture photoconductive antenna by an ultrashort laser pulse. Equally with the effect of the radiation screening, the effect of the non-linear absorption of an optical pump pulse (bleaching of photoconductive medium) was taken into account. It was shown that the effect of nonlinear absorption reconstructs the dynamics of the generation of terahertz radiation and must take into account the effects associated with the spread of the generated wave and the wave of excitation.
3
Content available remote

Generation of Terahertz Radiation by a Photoconductive Antenna

100%
Trukhin V., Andrianov A., Zinov'ev N.
Acta Physica Polonica A
|
2008
|
vol. 113
|
issue 3
921-924
EN
We report on the first principle calculations of photocarriers kinetics in a photoconductive antenna excited by an ultrashort optical laser pulse. The solution of non-equilibrium Boltzmann equation is used to derive the expression for the irradiated electric field. The analysis reveals the important role of non-uniform photocarrier distribution inside the active layer in the formation of the terahertz radiation from the emitter in both collinear and anti-collinear directions.
4
Content available remote

Undulator-Like Radiation and Cooperative Phenomenon in Semiconductor Microstructure with Grating

88%
Tralle I., Zięba P.
Acta Physica Polonica A
|
2012
|
vol. 121
|
issue 2
522-526
EN
In the article the cooperative N^2-effect is considered, that is the radiation whose power is ım N^2, where N is the number of emitters which in this case is equal to the number of electrons in a bunch. The suggested effect is the result of combining two other effects, Gunn-effect in GaAs and undulator-like radiation which can be produced by means of microstructure with grating (microundulator). It is very probable that the effect can be used for the developing of a new semiconductor-based room temperature source of the THz radiation.
5
Content available remote

Undulator-Like Radiation and N² Effects in Semiconductor Microstructures with Grating

88%
Tralle I., Zięba P.
Acta Physica Polonica A
|
2015
|
vol. 128
|
issue 2
228-230
EN
In the article the cooperative N²-effects are considered, that is the radiation whose power is ım N², where N is the number of emitters which in this case is equal to the number of electrons in a bunch. The suggested effects are the result of combining two effects: the Gunn-effect in GaAs and undulator-like radiation, or "pumping wave" acting on the electrons and which is the result of undulator field, while the second is the backward effect of radiation which is produced by electrons moving within such microundulator. It is very probable that the effects can be used for the developing of a new semiconductor-based room temperature source of the THz-radiation.
6
Content available remote

Effects of Coherent Synchrotron Radiation in Bunch Compressor of TARLA

63%
Yildiz H., Aksoy A., Arikan P.
Acta Physica Polonica A
|
2016
|
vol. 130
|
issue 1
214-216
EN
High order and non-linear effects in accelerator beamline play an important role in the transport of the beam. These effects cause variation of designed beam parameters such as emittance growth, bunch length variation, beam halo formation, etc. One of the known non-linear effects in bunch compressors is the coherent synchrotron radiation effect. In this study we focus on coherent synchrotron radiation effect in Turkish Accelerator and Radiation Laboratory in Ankara (TARLA) machine which is designed to drive Infrared Free Electron Laser, covering the range of 3-250 μm. We additionally discuss high order effects in bunch compressor of TARLA.
first rewind previous Page / 1 next fast forward last
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.