Particle Accelerator Physics

Wiedemann, Helmut

doi:10.1007/978-3-319-18317-6

Cited by 242 publications

(223 citation statements)

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“…In the first type, coherence is due to long-range order; in the second type, it is due to the collective instability in a many-body system with a long-range interaction. In laser physics, Dicke superradiation belongs to the first type and the free electron laser (FEL) belongs to the second type [1][2][3][4][5]. In this Letter, we present a new laser model that incorporates both types of dynamical coherence mechanism from the aspect of wave-particle interactions [6][7][8][9][10].…”

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confidence: 99%

Wave–particle interactions in a resonant system of photons and ion-solvated water

Konishi

2017

Physics Letters A

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We investigate a laser model for a resonant system of photons and ion cluster-solvated rotating water molecules in which ions in the cluster are identical and have very low, non-relativistic velocities and direction of motion parallel to a static electric field induced in a single direction. This model combines Dicke superradiation with wave-particle interaction. As the result, we find that the equations of motion of the system are expressed in terms of a conventional free electron laser system. This result leads to a mechanism for dynamical coherence, induced by collective instability in the wave-particle interaction.The mechanisms behind coherence in physical systems are mainly classified into two types. In the first type, coherence is due to long-range order; in the second type, it is due to the collective instability in a many-body system with a long-range interaction. In laser physics, Dicke superradiation belongs to the first type and the free electron laser (FEL) belongs to the second type [1][2][3][4][5]. In this Letter, we present a new laser model that incorporates both types of dynamical coherence mechanism from the aspect of wave-particle interactions [6][7][8][9][10]. The ingredients of this system are photons, solvated ions and water molecules.In Ref.[11] the many-body system of electric dipoles of water molecules that interact with the electromagnetic field radiated from rotating water molecules was studied using a quantum field theoretical approach based on an analogy to an FEL [3,4,[7][8][9][10]12]. In simplified settings, it was shown that, around an impurity that carries a sizeable electric dipole and induces a static electric field oriented in the z-direction, a permanent electric polarization of water molecules in the z-direction emerges in the limit cycle of the system, due to the coherent and collective interaction of the water molecules with the selected modes of the radiation field.Using this result, in this Letter we consider an FEL-like model for a cluster of solvated identical ions with very low, non-relativistic velocities and a uniform direction of motion. The electric dipoles of the water molecules which solvate each moving ion behave as XY spins which interact directly only with the transverse electromagnetic field radiated from the rotating water molecules. On the particle side of the wave-particle (i.e., radiation field-particle) interactions, there are two kinds of elements: water molecules and ions around which the water molecules are trapped by a Lennard-Jones potential.In the FEL model [3][4][5]7], each relativistic unbound electron has the phase degree of freedom of its XY spinlike direction on the x-y plane orthogonal to its direction of motion (called the z-direction). Due to the presence of * konishi.eiji.27c@st.kyoto-u.ac.jp an undulator, that is, a transverse magnetic field created by a periodic arrangement of magnets with alternating poles, the unbound electrons are accelerated, producing synchrotron radiation.In our case, the variable corresponding to the phase coord...

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confidence: 99%

Wave–particle interactions in a resonant system of photons and ion-solvated water

Konishi

2017

Physics Letters A

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“…Like to the characteristics of light, particle beams have attend to spread out due to an inherent beam divergence. To keep the particle beam together and to generate specifically desired beam properties at selected points along the beam transport line, focusing devices are required [7]. The most suitable device that provides a material free aperture and the desired focusing field is called a quadrupole magnetic lens [8,9].…”

Section: Methodsmentioning

confidence: 99%

Calculate Optical Parameters Of Ions BEAM From Plasma Source

Hussein

2017

Al-Mustansiriyah J. Sci.

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The research explains some of optical parameters of charged particles that emitted from plasma source. The study included theoretical analysis using matrices representation to calculate the focal length, lens power, focusing factor and displacement (the bandwidth envelope) for Horizontal plane. Results showed the increasing in focusing factor causes decreasing in focal length, the opposite action appears with lens power. Furthermore the increasing in focusing factor causes decreasing in Horizontal displacement (beam envelope).

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“…At different energies, the strongest contribution to the observations can shift from one source to another, thus changing the orientation of the dipole (Erlykin & Wolfendale 2006;Blasi & Amato 2012;Ptuskin 2012;Pohl & Eichler 2013;Sveshnikova et al 2013;Savchenko et al 2015; 10 The rigidity of a charged particle is a measure of its momentum, and it refers to the fact that a higher momentum particle has a higher resistance to deflection by a magnetic field. It is defined as = = R r B c E Ze L , with r L as the particle gyroradius and B as the magnetic field (see Wiedemann 2015). A 1 TeV proton and a 26 TeV iron nucleus have a rigidity of 1 TV.…”

Section: The Problem Of Anisotropies and Corresponding Approachesmentioning

confidence: 99%

TeV Cosmic-Ray Anisotropy from the Magnetic Field at the Heliospheric Boundary

López-Barquero

Desiati

Lazarían

et al. 2017

ApJ

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We performed numerical calculations to test the suggestion by Desiati and Lazarian that the anisotropies of TeV cosmic rays may arise from their interactions with the heliosphere. For this purpose, we used a magnetic field model of the heliosphere and performed direct numerical calculations of particle trajectories. Unlike earlier papers testing the idea, we did not employ time-reversible techniques that are based on Liouville's theorem. We showed numerically that for scattering by the heliosphere, the conditions of Liouville's theorem are not satisfied, and the adiabatic approximation and time-reversibility of the particle trajectories are not valid. Our results indicate sensitivity to the magnetic structure of the heliospheric magnetic field, and we expect that this will be useful for probing this structure in future research.

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Particle Accelerator Physics

Cited by 242 publications

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Wave–particle interactions in a resonant system of photons and ion-solvated water

Wave–particle interactions in a resonant system of photons and ion-solvated water

Calculate Optical Parameters Of Ions BEAM From Plasma Source

TeV Cosmic-Ray Anisotropy from the Magnetic Field at the Heliospheric Boundary

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