11 papers
A Helical-Deflector-Based Radio-Frequency Spiral Scanning System for keV Energy Electrons
Simon Zhamkochyan, Vanik Kakoyan, Vardan Bardakhchyan +21
We present the design, modeling, and experimental validation of a radio-frequency based time-to-position conversion system for keV electrons incorporating a helical deflector opera…
Magnetically Induced Transparency-Absorption and Normal-Anomalous Dispersion Characteristics of Medium or Any J-Type Configuration Atomic Vapors Subject to a Vector Magnetic Field and a Weak Resonant Pump
Hayk L. Gevorgyan
We have developed an analytical framework for magnetically induced transparency-absorption (MITA) and normal-anomalous dispersion (MINAD) in a weakly driven vapo…
A Capacitor Model of the Helical Deflector: Revisiting Shamaev's Proposal and the Textbook Model
Hayk Lekdar Gevorgyan
An RF helical deflector is a type of electron and ion optics device that applies a time-dependent rotating transverse electric or magnetic field by means of time-dependent RF volta…
Positron Bunch Radiation in the System of Tightly Packed Nanotubes
Hayk L. Gevorgyan, Koryun L. Gevorgyan, Lekdar A. Gevorgian
Radiation emitted by a bunch of positrons channeled in nanotubes at zero emission angle is studied taking into account medium polarization. The formation of radiation is characteri…
FEL Gain Enhancement in an Optical Klystron
Anahit H. Shamamian, Hayk L. Gevorgyan, Lekdar A. Gevorgian
A system comprising two identical helical or planar undulators separated by a gap -- viz., an optical klystron (OK) -- is investigated. A formula for the frequency distribution of…
Partially Coherent X-Ray Oscilex Radiation from a FEL-Modulated Positron Bunch during Its Planar Channeling in a Crystalline Undulator
Hayk L. Gevorgyan, Lekdar A. Gevorgian
The radiation emitted at zero angle by a microbunched positron bunch undergoing planar channeling in a crystalline undulator (CU) is studied. The bunch energy is assumed to be far…