Paper by V M Arutyunyan and S G Oganesyan 'The stimulated Cherenkov effect' [<i>Physics –Uspekhi</i>, October 1994, 37 (10) 1005 – 1039]

Arutyunyan, V. M.; Oganesyan, S. G.

doi:10.1070/pu1995v038n11abeh001496

Cited by 4 publications

(5 citation statements)

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“…Nevertheless roughness can impact TR significantly if surface variations exceed λ within a characteristic disc of radius γ e λ. In this case, various, sometimes conflicting, effects of roughness on TR have been reported: increased flux due to increased surface area; decreased flux due to transverse shielding, which can also lead to depolarization and disappearance of the central intensity minimum; and a speckled intensity pattern (Arutyunyan et al, 1979;Baghiyan, 2001Baghiyan, , 2004Reiche and Rosenzweig, 2001). Roughness affects forward and backward TR in the same way.…”

Section: Transition Radiationmentioning

confidence: 99%

Diagnostics for plasma-based electron accelerators

et al. 2018

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Plasma-based accelerators that impart energy gain as high as several GeV to electrons or positrons within a few centimeters have engendered a new class of diagnostic techniques very different from those used in connection with conventional radio-frequency (RF) accelerators. The need for new diagnostics stems from the micrometer scale and transient, dynamic structure of plasma accelerators, which contrasts with the meter scale and static structure of conventional accelerators. Because of this micrometer source size, plasma-accelerated electron bunches can emerge with smaller normalized transverse emittance (n < 0.1 mm mrad) and shorter duration (τ b ∼ 1 fs) than bunches from RF linacs. We review single-shot diagnostics that determine such small n and τ b non-invasively and with high resolution from wide-bandwdith spectral measurement of electromagnetic radiation the electrons emit: n from x-rays emitted as electrons interact with transverse internal fields of the plasma accelerator or with external optical fields or undulators; τ b from THz to optical coherent transition radiation emitted upon traversing interfaces. The duration of ∼ 1 fs bunches can also be measured by sampling individual cycles of a co-propagating optical pulse or by measuring the associated magnetic field using a transverse probe pulse. Because of their luminal velocity and micrometer size, the evolving structure of plasma accelerators, the key determinant of accelerator performance, is exceptionally challenging to visualize in the laboratory. Here we review a new generation of laboratory diagnostics that yield snapshots, or even movies, of laser-and particle-beam-generated plasma accelerator structures based on their phase modulation or deflection of femtosecond electromagnetic or electron probe pulses. We discuss spatiotemporal resolution limits of these imaging techniques, along with insights into plasma-based acceleration physics that have emerged from analyzing the images, and comparing them to simulated plasma structures. CONTENTS I.Introduction 1 II. Properties of plasma accelerator structures and beams 3 A. General properties of plasma electron accelerators 3 1. Frequency-domain holography 41 2. Longitudinal optical shadowgraphy 45 3. Transverse optical probing 46 4. Electron radiography 48 D. "Movies" of wake evolution 49 1. Multi-shot transverse probes 49 2. Single-shot frequency-domain streak camera 50 3. Single-shot imaging of meter-long wakes 52 E. Scaling of wake probes with plasma density 54 V. Conclusion 55 References 58

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Section: Transition Radiationmentioning

confidence: 99%

Diagnostics for plasma-based electron accelerators

et al. 2018

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“…For example, the maximum of the spectral sensitivity of silicon-based IPDs is observed at λ ≈ 0.98 µm with the extrinsic photosensitivity extending to λ = 6 µm. Among studied silicon-based IPDs, the diodes whose base is compensated with zinc or sulfur have the highest sensitivity [42,43]. Nonadditive photoconductivity was observed in the case of the combined effect of "intrinsic" and "extrinsic" illumination on the Si:Zn diodes [44].…”

Section: Injection-related Photodiodes Based On Ge and Simentioning

confidence: 99%

10.1007/s11453-008-1016-y

2010

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Physical principles of the operation of injection-based photodiodes are generalized. The unified approach to studying the photoelectric phenomena with the injection-based amplification is substantiated. Physical mechanisms of injection-related amplification and the parameters and characteristics of photodetectors are discussed. Diodes for ultraviolet, visible, and infrared spectral regions with sensitivity much higher than in the injection-free analogues are considered.

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“…Thus, we can use the orthonormality relation (21) on the orbital quantum numbers 1. This yields (l)(m-lntlY2 (43) 1 w n l n z m ( ' 1 3 6 2 ) = r(lml + a1 + 1)r(21 + s1 + a2 + 2 ) E?mKk 9…”

Section: Interbasis Expansion Between Parabolic and Spherical Basesmentioning

confidence: 99%

“…-n1, -1 + Iml,l + (ml + 6, + 62 + 1 Iml + S] + 1,-n + Iml + 1 . 3 4 The introduction of (46) into (43) gives and owing to (44), we end up with (48) -fl1,-1 + Iml,l + (mi + 81 + 6 2 + 1 ImJ + 61 + 1,-n + Iml + 1 3 4 which constitutes a closed-form expression for the interbasis coefficients. The next step is to show that the interbasis coefficients (48) are indeed a continuation on the real line of the Clebsch-Gordan coefficients for the group SU(2).…”

Section: Interbasis Expansion Between Parabolic and Spherical Basesmentioning

confidence: 99%

On a generalized Kepler–Coulomb system: Interbasis expansions

Kibler

Mardoyan

Pogosyan

1994

Int J of Quantum Chemistry

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This paper deals with a dynamical system that generalizes the Kepler-Coulomb system and the Hartmann system. It is shown that the Schrödinger equation for this generalized KeplerCoulomb system can be separated in prolate spheroidal coordinates. The coefficients of the interbasis expansions between three bases (spherical, parabolic and spheroidal) are studied in detail. It is found that the coefficients for the expansion of the parabolic basis in terms of the spherical basis, and vice-versa, can be expressed through the Clebsch-Gordan coefficients for the group SU(2) analytically continued to real values of their arguments. The coefficients for the expansions of the spheroidal basis in terms of the spherical and parabolic bases are proved to satisfy three-term recursion relations.

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Paper by V M Arutyunyan and S G Oganesyan 'The stimulated Cherenkov effect' [Physics –Uspekhi, October 1994, 37 (10) 1005 – 1039]

Cited by 4 publications

References 0 publications

Diagnostics for plasma-based electron accelerators

Diagnostics for plasma-based electron accelerators

10.1007/s11453-008-1016-y

On a generalized Kepler–Coulomb system: Interbasis expansions

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