RUPAC2012 - List of Keywords (lattice)

Paper	Title	Other Keywords	Page
MOYCH01	Status of Electron-Positron Collider VEPP-2000	luminosity, positron, solenoid, booster	15
	Y.M. Shatunov, D.E. Berkaev, A.A. Borisov, A.N. Kirpotin, I. Koop, A.P. Lysenko, E. Perevedentsev, Yu. A. Rogovsky, A.L. Romanov, A.I. Senchenko, P.Yu. Shatunov, D.B. Shwartz, I. Zemlyansky, Yu.M. Zharinov BINP SB RAS, Novosibirsk, Russia I. Nesterenko ORNL, Oak Ridge, Tennessee, USA
	Funding: Work supported by Russian Ministry of Education and Science, Grant of the Novosibirsk region Government 2012 Electron-positron collider VEPP-2000 operates with two detectors SND and CMD-3 at the energy range 500 - 1000 MeV per beam. A number of studies of the round beam operation have been done, in that colliding beam parameter value 0.15 was acheaved. Buster upgrade up to 1 GeV energy is in progress as well as beam transfer chanel from new positron source. These improvements will open way for the collider luminosity enhancement.
	Slides MOYCH01 [2.493 MB]

TUPPB003	Progress in NICA Booster Design	injection, booster, extraction, kicker	310
	A.S. Valkovich, O.S. Kozlov, I.N. Meshkov, V.A. Mikhaylov, A.O. Sidorin, G.V. Trubnikov JINR, Dubna, Moscow Region, Russia
	New collider facility NICA * is envisioned to be built at The Joint Institute of Nuclear Research. The work presented explores issues of correction system of the Booster Synchrotron. The optimal arrangement of Beam Position Monitors and Orbit Correctors along the ring was investigated in order to achieve decent quality of the orbit correction. The SVD properties of the orbit correction system are presented. Optimal arrangement of the sextupole lenses for the correction of chromaticity of the ring was obtained. The reduction of the dynamical aperture due to the presence of the sextupole lenses was minimized by means of proper choice of betatron phase advances between the lenses. * Design and construction of Nuclotron-based Ion Collider fAcility (NICA), Conceptual design report, Editors I.Meshkov, A.Sidorin, JINR, Dubna, 2008

TUPPB010	RF Quadrupole Focusing Lattices	rfq, focusing, quadrupole, linac	331
	A.S. Plastun, T.V. Bondarenko MEPhI, Moscow, Russia
	Spatial homogeneity of a conventional RFQ allows to estimate parameters of the lattice easily. Hybrid-RFQ structures with spatially periodic RFQ lenses are more complicated in respect of beam dynamics. Transverse stability of beam motion is defined by lattice parameters. Basically parameters of RF focusing lattices are influenced by longitudinal emittance of a bunch in contrast to static focusing lattices. The paper presents a method which allows to evaluate parameters of a very wide class of RF and static quadrupole lattices. Transverse acceptance and acceleration rate could be determined. The method is useful to compare Hybrid-RFQ structures with a conventional RFQ.

TUPPB026	Comparison of Matrix Formalism and Step-by-step Integration for the Long-term Dynamics Simulation in Electrostatic Fields	simulation, electromagnetic-fields, storage-ring, controls	370
	A.N. Ivanov St. Petersburg State University, St. Petersburg, Russia
	An approach based on matrix formalism for solving differential equations is described. Effective in sense of performance matrix formalism can be tested with less efficient, but accurate traditional algorithm of numerical simulation based on the Runge-Kutta scheme. In both cases the symplectic version of the algorithms are used. The results coincide to analytical calculations, but some disagreements have been identified. The approach implementation is demonstrated in the problem of long-term spin dynamics in electrostatic fields.

TUPPB048	The Multi-Tip Field Emission Cathode Mathematical Modeling	cathode, electron, vacuum, space-charge	421
	N.V. Egorov, E.M. Vinogradova Saint-Petersburg State University, Saint-Petersburg, Russia
	The multi-tip field cathode as the field emission cathode arrays for rectangular lattice is considered. The field emission cathodes are of interest for vacuum nano-scale electronic devices. The electrostatic potential distribution is presented for the periodic system of free-number thin tips on a plane substrate as a field emission cathode and a plane substrate as an anode. The tips shape may be various. The potential of the substrate and cathode is equal the zero, the anode's potential is equal a constant. The effect of space charge is neglected. The each tip is represented as a system of the point charges. The point charges are determined to the zero equipotential coincides with the cathode's shape. The potential distribution is found for whole region of the field emission cathode arrays. The exact three-dimensional solution to the Laplace/Poisson equation has been obtained in the Cartesian coordinate system. This solution has direct applications in three-dimensional calculations of electron trajectories in micron- and submicron-sized field-emitter arrays.

WEPPC044	Positron Annihilation Spectroscopy at LEPTA Facility	positron, electron, background, vacuum	532
	P. Horodek, I.N. Meshkov JINR/DLNP, Dubna, Moscow region, Russia A.G. Kobets, V.I. Lokhmatov, V. Pavlov, A.Yu. Rudakov, A.A. Sidorin, S. Yakovenko JINR, Dubna, Moscow Region, Russia
	The Low Energy Positron Toroidal Accumulator (LEPTA) at JINR proposed for generation of positronium in flight can be used for positron annihilation spectroscopy (PAS). The positron injector of the LEPTA facility can generate continuous slow positron beam of the intensity up to 1*10⁷ s⁻¹ at the energy in the range of a few eV to 100 keV and width of the spectrum 1-2 eV. The injector is based on radioactive 22Na isotope. The solid neon is used as moderator to generate monochromatic positron beam. It is known that positrons implanted into the matter can localize the defects of structure as vacancies, clusters of vacancies and pores. Observation of gamma quanta (511 keV) from annihilation process allows to obtain the information about the presence, concentration and kind of defects. Nowadays, the experiments with the use of slow positrons beam instead of standard isotopic sources are more popular. The progress in the creation of Doppler broadening of annihilation gamma line spectrometer will be presented here. In the simplest version, it is a set composed of a HpGe detector, a preampliefier, an ampliefier, a MC analyzer and a PC computer. This combination makes possible the observation of changes in 511 keV gamma line, calculation characteristics for PAS parameters and in effect to deduce about defects concentration and their chemical surrounding.

WEPPD049	Software for Virtual Accelerator Environment	controls, simulation, EPICS, space-charge	653
	N.V. Kulabukhova St. Petersburg State University, St. Petersburg, Russia
	The article discusses appropriate technologies for software implementation of the Virtual Accelerator. The Virtual Accelerator is considered as a set of services and tools enabling transparent execution of computational software for modeling beam dynamics in accelerators on distributed computing resources. Control system toolkits EPICS, realization of the GUI with existing frameworks and visualization of the data are discussed in the paper. The presented research consists of software analysis for realization of interaction between all levels of the Virtual Accelerator.

Paper

Title

Other Keywords

Page

MOYCH01

Status of Electron-Positron Collider VEPP-2000

luminosity, positron, solenoid, booster

15

Y.M. Shatunov, D.E. Berkaev, A.A. Borisov, A.N. Kirpotin, I. Koop, A.P. Lysenko, E. Perevedentsev, Yu. A. Rogovsky, A.L. Romanov, A.I. Senchenko, P.Yu. Shatunov, D.B. Shwartz, I. Zemlyansky, Yu.M. Zharinov
BINP SB RAS, Novosibirsk, Russia
I. Nesterenko
ORNL, Oak Ridge, Tennessee, USA

Funding: Work supported by Russian Ministry of Education and Science, Grant of the Novosibirsk region Government 2012
Electron-positron collider VEPP-2000 operates with two detectors SND and CMD-3 at the energy range 500 - 1000 MeV per beam. A number of studies of the round beam operation have been done, in that colliding beam parameter value 0.15 was acheaved. Buster upgrade up to 1 GeV energy is in progress as well as beam transfer chanel from new positron source. These improvements will open way for the collider luminosity enhancement.

Slides MOYCH01 [2.493 MB]

TUPPB003

Progress in NICA Booster Design

injection, booster, extraction, kicker

310

A.S. Valkovich, O.S. Kozlov, I.N. Meshkov, V.A. Mikhaylov, A.O. Sidorin, G.V. Trubnikov
JINR, Dubna, Moscow Region, Russia

New collider facility NICA * is envisioned to be built at The Joint Institute of Nuclear Research. The work presented explores issues of correction system of the Booster Synchrotron. The optimal arrangement of Beam Position Monitors and Orbit Correctors along the ring was investigated in order to achieve decent quality of the orbit correction. The SVD properties of the orbit correction system are presented. Optimal arrangement of the sextupole lenses for the correction of chromaticity of the ring was obtained. The reduction of the dynamical aperture due to the presence of the sextupole lenses was minimized by means of proper choice of betatron phase advances between the lenses.
* Design and construction of Nuclotron-based Ion Collider fAcility (NICA), Conceptual design report, Editors I.Meshkov, A.Sidorin, JINR, Dubna, 2008

TUPPB010

RF Quadrupole Focusing Lattices

rfq, focusing, quadrupole, linac

331

A.S. Plastun, T.V. Bondarenko
MEPhI, Moscow, Russia

Spatial homogeneity of a conventional RFQ allows to estimate parameters of the lattice easily. Hybrid-RFQ structures with spatially periodic RFQ lenses are more complicated in respect of beam dynamics. Transverse stability of beam motion is defined by lattice parameters. Basically parameters of RF focusing lattices are influenced by longitudinal emittance of a bunch in contrast to static focusing lattices. The paper presents a method which allows to evaluate parameters of a very wide class of RF and static quadrupole lattices. Transverse acceptance and acceleration rate could be determined. The method is useful to compare Hybrid-RFQ structures with a conventional RFQ.

TUPPB026

Comparison of Matrix Formalism and Step-by-step Integration for the Long-term Dynamics Simulation in Electrostatic Fields

simulation, electromagnetic-fields, storage-ring, controls

370

A.N. Ivanov
St. Petersburg State University, St. Petersburg, Russia

An approach based on matrix formalism for solving differential equations is described. Effective in sense of performance matrix formalism can be tested with less efficient, but accurate traditional algorithm of numerical simulation based on the Runge-Kutta scheme. In both cases the symplectic version of the algorithms are used. The results coincide to analytical calculations, but some disagreements have been identified. The approach implementation is demonstrated in the problem of long-term spin dynamics in electrostatic fields.

TUPPB048

The Multi-Tip Field Emission Cathode Mathematical Modeling

cathode, electron, vacuum, space-charge

421

N.V. Egorov, E.M. Vinogradova
Saint-Petersburg State University, Saint-Petersburg, Russia

The multi-tip field cathode as the field emission cathode arrays for rectangular lattice is considered. The field emission cathodes are of interest for vacuum nano-scale electronic devices. The electrostatic potential distribution is presented for the periodic system of free-number thin tips on a plane substrate as a field emission cathode and a plane substrate as an anode. The tips shape may be various. The potential of the substrate and cathode is equal the zero, the anode's potential is equal a constant. The effect of space charge is neglected. The each tip is represented as a system of the point charges. The point charges are determined to the zero equipotential coincides with the cathode's shape. The potential distribution is found for whole region of the field emission cathode arrays. The exact three-dimensional solution to the Laplace/Poisson equation has been obtained in the Cartesian coordinate system. This solution has direct applications in three-dimensional calculations of electron trajectories in micron- and submicron-sized field-emitter arrays.

WEPPC044

Positron Annihilation Spectroscopy at LEPTA Facility

positron, electron, background, vacuum

532

P. Horodek, I.N. Meshkov
JINR/DLNP, Dubna, Moscow region, Russia
A.G. Kobets, V.I. Lokhmatov, V. Pavlov, A.Yu. Rudakov, A.A. Sidorin, S. Yakovenko
JINR, Dubna, Moscow Region, Russia

The Low Energy Positron Toroidal Accumulator (LEPTA) at JINR proposed for generation of positronium in flight can be used for positron annihilation spectroscopy (PAS). The positron injector of the LEPTA facility can generate continuous slow positron beam of the intensity up to 1*10⁷ s⁻¹ at the energy in the range of a few eV to 100 keV and width of the spectrum 1-2 eV. The injector is based on radioactive 22Na isotope. The solid neon is used as moderator to generate monochromatic positron beam. It is known that positrons implanted into the matter can localize the defects of structure as vacancies, clusters of vacancies and pores. Observation of gamma quanta (511 keV) from annihilation process allows to obtain the information about the presence, concentration and kind of defects. Nowadays, the experiments with the use of slow positrons beam instead of standard isotopic sources are more popular. The progress in the creation of Doppler broadening of annihilation gamma line spectrometer will be presented here. In the simplest version, it is a set composed of a HpGe detector, a preampliefier, an ampliefier, a MC analyzer and a PC computer. This combination makes possible the observation of changes in 511 keV gamma line, calculation characteristics for PAS parameters and in effect to deduce about defects concentration and their chemical surrounding.

WEPPD049

Software for Virtual Accelerator Environment

controls, simulation, EPICS, space-charge

653

N.V. Kulabukhova
St. Petersburg State University, St. Petersburg, Russia

The article discusses appropriate technologies for software implementation of the Virtual Accelerator. The Virtual Accelerator is considered as a set of services and tools enabling transparent execution of computational software for modeling beam dynamics in accelerators on distributed computing resources. Control system toolkits EPICS, realization of the GUI with existing frameworks and visualization of the data are discussed in the paper. The presented research consists of software analysis for realization of interaction between all levels of the Virtual Accelerator.