Ultrafast electron microbunch trains have broad applications in which the individual bunch length and the bunch-to-bunch interval are critical parameters that need to be precisely diagnosed. However, ...directly measuring these parameters remains challenging. This paper presents an all-optical method that simultaneously measures the individual bunch length and the bunch-to-bunch spacing through an orthogonal THz-driven streak camera. For a 3 MeV electron bunch train, the simulation indicates that the temporal resolution of individual bunch length and the bunch-to-bunch spacing is 2.5 fs and 1 fs, respectively. Through this method, we expect to open a new chapter in the temporal diagnostic of electron bunch trains.
In this paper, we describe the project of a photon source with energies up to 2500 MeV at the SKIF synchrotron radiation facility (under construction in Novosibirsk). It is intended for experiments ...on photonuclear reactions, nonlinear QED, EM detector calibration and other applications. A polarized photon beam with a flux of 10
6
–10
8
Hz (in full spectrum) is produced using Compton backscattering (or inverse scattering) of IR, visible, and UV laser radiation, as well as the UV band of its own synchrotron radiation, on the SKIF electron beam (15 kHz). Spectrum monochromatization with collimators or/and tagging system by recoil electrons is possible. The discrepancy between experimental and theoretical photofission cross sections of actinide nuclei in a photon energy range of hundreds of MeV has been known since the 1980s, so it is proposed to study these cross sections in the first series of experiments.
Abstract
The work addresses the use of electron beam produced by the
linear induction accelerator to generate terahertz radiation pulses
of 100 MW power level based on a free electron laser scheme. ...The
beam parameters required for efficient generation are given. The
features of transverse beam dynamics when transporting the beam
through the linac are investigated. Emphasis is put on the electron
injector which geometry and operation parameters mainly determine
the beam characteristics at the linac exit. Most of the possible
factors contributing to the beam emittance gain in the accelerator
are considered. The obtained analytical estimates are compared to
the numerical simulation results. The experimental results on
compressing and transporting the beam having the electron energy of
5 MeV and the current of 1 kA in the transport system of free
electron laser are presented.
—In this paper, the influence of the effects of potential well distortion and longitudinal microwave instability on the longitudinal size of the electron beam in the VEPP-4M collider is considered. ...As a result, the value of the longitudinal broadband impedance was obtained, which can be used to calculate the longitudinal size of the beam in any collider mode.
Abstract
The Siberian ring source of photons (SKIF) is a new 3 GeV
fourth-generation synchrotron light source being developed by the
Budker Institute of Nuclear Physics (BINP). A beam loss monitoring
...system is necessary to ensure its reliable commissioning and
operation. Two types of beam loss monitors will be installed in the
SKIF: 5 fiber-based Cherenkov beam loss monitors (CBLMs) for the
linac and transfer lines and 128 scintillator-based beam loss
monitors (SBLMs) for the storage ring. Sophisticated electronic
equipment is employed to use these monitors in different modes of
SKIF operation. The paper describes the design of the SKIF beam loss
monitoring system based on numerical simulations and experimental
studies.
This work is devoted to the development of a method for measuring beam sizes in cyclic charged particle accelerators using an interferometer based on the Young scheme with a double-slit diaphragm. We ...have carried out an experimental verification of the original spectral method for scanning the interference pattern. The results of measurements of the spectrum of low-frequency oscillations of the beam of the storage ring of the Kurchatov Synchrotron Radiation Source (KSRS) obtained by means of the Optical Observation Station (OOS) of the storage ring are presented.
The results of a study of outgassing of boron carbide and durable ultrahigh molecular weight polymethyl methacrylate (organic glass) in vacuum are presented. It is shown that boron carbide ...manufactured by OOO Virial (St. Petersburg) by the cold-pressing technique, which is followed by free sintering at a temperature of approximately 2200°C, meets the requirements that are stated by the ITER (International Thermonuclear Experimental Reactor). The results studying ultrahigh molecular weight durable polymethyl methacrylate (UMW-PMMA), which was manufactured at the Institute of Solid-State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences (ISSCM SB RAS) using original technologies, showed that UMW-PMMA with frontal polymerization has the lowest gas emission compared to “conventional” PMMA and is very promising for the manufacture of specialized vacuum chambers for electrophysical facilities.
This paper describes stations, both existing and under development, for the diagnostics of beam parameters of the 3rd stage of the Novosibirsk free electron laser (FEL). A modification of the method ...for measuring electron energy spread using the spectrum of spontaneous undulator radiation under the operating conditions of the Novosibirsk FEL is presented.
Abstract
As the injector of the new fourth-generation SKIF
synchrotron light source at the BINP SB RAS (Novosibirsk, Russia),
the linear accelerator will provide a 200 MeV electron beam. A
precise ...measurement of the beam is very important for the control of
the linac and even the entire light source. A set of diagnostic
instruments for tuning the linac and measuring the beam parameters
starting from the electron RF gun to the output of accelerator has
been designed. The instrumentation should cover the dynamic
diagnostic range of 0.6 to 200 MeV and a beam duration from the
initial 100 ps to 3 ps at the output of the accelerator. The set
includes eight fluorescent screens to measure beam transverse size,
two Cherenkov probes and RF-cavity sensors to record beam duration,
a dipole magnetic spectrometer to measure energy and energy spread,
a Faraday cup (FC) and fast current transformers (FCTs) to measure
beam charge current, and beam position monitors (BPMs) to check the
beam position. This paper aims to give an overview of the beam
instrumentation and briefly describes the design and parameters of
each diagnostic system. The results of numerical and dynamics
simulations of some of the instruments are briefed. Possible
scenarios of linac tuning are discussed.
The article presents a Russian atomic spectroscopy, information system electronic structure of atoms (IS ESA) (http://grotrian.nsu.ru), and describes its main features and options to support research ...and training. The database contains over 234 000 records, great attention paid to experimental data and uniform filling of the database for all atomic numbers Z, including classified levels and transitions of rare earth and transuranic elements and their ions. Original means of visualization of scientific data in the form of spectrograms and Grotrian diagrams have been proposed. Presentation of spectral data in the form of interactive color charts facilitates understanding and analysis of properties of atomic systems. The use of the spectral data of the IS ESA together with its functionality is effective for solving various scientific problems and training of specialists.
