RUPAC2012 - List of Keywords (rfq)

Paper	Title	Other Keywords	Page
TUZCH02	Mathematical Modeling and Optimization of Beam Dynamics in Accelerators	controls, focusing, quadrupole, electromagnetic-fields	68
	D.A. Ovsyannikov St. Petersburg State University, St. Petersburg, Russia
	In this paper we treat the problem of beam dynamics optimization as a control theory problems. We consider different mathematical model of optimization. The approach to solving optimization problem for charged particle dynamics in accelerators includes: construction of mathematical model of controlled dynamical process; choice of control functions or parameters of optimization; construction of quality functionals, which allow efficient evaluation of various characteristics of examined controlled motion; analytical representation of the functional variations, which allow to construct various methods of optimization for quality functionals; construction of methods and algorithms of optimization. Problem of statement is considered on the pattern of RFQ channel.
	Slides TUZCH02 [1.601 MB]

TUCCH02	Beam Dynamics Investigations for 433 MHz RFQ Accelerator	emittance, focusing, ion, injection	82
	Y.A. Svistunov NIIEFA, St. Petersburg, Russia A.P. Durkin MRTI RAS, Moscow, Russia A.D. Ovsyannikov St. Petersburg State University, St. Petersburg, Russia
	Modeling results for deuteron dynamics in RFQ structure with operational frequency 433 MHz and 1 MeV output energy are presented. The results are compared with experimental data. The purpose of investigation is to find optimal input RFQ emittance parameters for off-nominal values of input current and vane voltage.
	Slides TUCCH02 [0.642 MB]

WEBCH01	The Status of the SARAF Phase-I Linac	linac, target, proton, status	103
	L. Weissman, Y. Ben Aliz, D. Berkovits, O. Dudovich, I. Eliyahu, I. Fishman, I.G. Gertz, A. Grin, A. Kreisler, G. Lempert, I. Mardor, A. Perry, E. Reinfeld, J. Rodnizki Soreq NRC, Yavne, Israel
	Phase I of the Soreq Applied Research Accelerator Facility - SARAF is under operation at the Soreq Nuclear Research Center. According to Phase I design specifications, SARAF superconducting linear RF accelerator should yield 2 mA protons and deuterons CW beams at energies up to 4 and 5 MeV, respectively. The status of Phase I main components is reported as well as the beam operation experience accumulated recently. The latter include acceleration of a 1 mA CW protons beam up to 3.5 MeV and 1 mA pulsed, duty cycle of few %, deuterons beam to up to 4.7 MeV. Further planned improvements in the current facility and plans for the future Phase II of the SARAF linac are discussed.
	Slides WEBCH01 [7.617 MB]

TUPPB010	RF Quadrupole Focusing Lattices	focusing, lattice, 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.

TUPPB020	Mathematical Model of Beam Dynamics Optimization in Traveling Wave	controls, acceleration, injection, resonance	355
	A.D. Ovsyannikov, A.Yu. Shirokolobov St. Petersburg State University, St. Petersburg, Russia
	In works by B.I. Bondarev, A.P. Durkin, A.D. Ovsyannikov mathematical model of optimization of of charged particles dynamics in RFQ accelerators was proposed. In this paper a new mathematical model of optimization of particle dynamics in traveling wave is considered. Joint optimization model of program and disturbed motions is investigated.

TUPPB025	Investigation of Program and Perturbed Motions of Particles in Linear Accelerator	controls, electron, resonance, simulation	367
	I.D. Rubtsova, E.N. Suddenko St. Petersburg State University, St. Petersburg, Russia
	Beam control model for program and perturbed motions with interaction account is realized. Quality functional gradient is obtained.

TUPPB059	Low Energy Channel for Modernized LU-20	ion, emittance, solenoid, linac	442
	V. Aleksandrov, A. Govorov, V. Monchinsky, G.V. Trubnikov JINR, Dubna, Moscow Region, Russia
	The modernization of LU-20 accelerator expects change existing electrostatic for-injector on RFQ type pre-accelerator. Low energy channel of transportation of beams is offered from three sources of ions: ESIS, LIS and SPIon - to RFQ. Parameters of channel and results of numerical modeling on fitting beams parameters with acceptance of RFQ are presented.

WEPPC002	RF Design and Tuning of Linac4 RFQ	linac, dipole, quadrupole, controls	448
	A. France, M. Desmons, O. Piquet CEA/DSM/IRFU, France C. Rossi CERN, Geneva, Switzerland
	In the Linac4 (a part of CERN accelerator complex upgrade), a 3 MeV, 3-meter long, 352 MHz RFQ accelerates a 70 mA H⁻ ion beam from source to DTL input energy. RF design and tuning both rely on the same 4-wire transmission model (TLM), which ensures a consistent control of all RF parameters. 3D simulations are used to determine electrical parameters of TLM in the design process. RFQ end-circuits are designed to minimize sensitivity of RFQ voltage profile to perturbations that might occur during operation, and are tuned with quadrupole rods. Slug tuners size and distribution take into account fabrication tolerances and bead-pull measurement constraints. The three 1-meter long RFQ sections are machined and brazed in CERN. RF bead-pull measurements used to estimate RFQ electrical parameters throughout fabrication steps have not revealed any significant departure from expected values. Vacuum ports position is also adjusted prior to braze using RF measurements. Electrical parameters of end-circuits are derived from sets of five linearly independent bead-pull measurements. Slugs are tuned using a closed-loop algorithm, where "command" quantities are tuner positions, "control" quantities are measured fields, and RFQ inverse transfer function is based on the TLM. Tuning convergence and final accuracy will be presented.

WEPPC011	Modernisation of an Initial Part the MILAC Heavy Ion Linear Accelerator	ion, acceleration, site, heavy-ion	466
	V.A. Bomko, A.P. Kobets, V.V. Panov, K.V. Pavlij, G.V. Sotnikov, B.V. Zajtsev NSC/KIPT, Kharkov, Ukraine
	New pre-stripping section (PSS-20) the MILAC heavy ion linear accelerator with the relation of their mass to charge A/q=20 is developed. That will allow to extend considerably a range accelerating ions and to increase intensity of beams. On an initial part of acceleration of ions from 6 keV/u up to 150 keV/u high capture in process of acceleration of the injected ions is provided interdigital (IH) accelerating structure with Radio-Frequency Quadrupole (RFQ) focusing. On the second part of acceleration of ions from 150 keV/u up to 1 MeV/u the highest rate of acceleration is created interdigital (IH) accelerating structure with drift tubes. Mathematical modeling geometrical and dynamic characteristics of accelerating structures pre-stripping section PSS-20 is executed. Dynamics of heavy ions in the course of acceleration is optimised.

WEPPC013	Novel DTL Section for ITEP-TWAC Heavy Ion Injector	quadrupole, simulation, ion, DTL	469
	V. Andreev, N.N. Alexeev, A. Kolomiets, V.A. Koshelev ITEP, Moscow, Russia A.S. Plastun MEPhI, Moscow, Russia
	A novel 81.5 MHz H-type drift tube (DTL) accelerating structure with rf quadrupoles following RFQ in the new injector I-4 for acceleration ions up to energy about 5 MeV/u for ITEP TWAC facility has been proposed. It is based on a combination of a DTL structure and the resonator with magnetic coupling windows. Computer simulations show that it can provide some advantages in comparison with conventional IH-DTL structure. Results of both electrodynamics and beam dynamics computer simulations of the structure as well as a new approach for beam matching RFQ and the section are presented.

Paper

Title

Other Keywords

Page

TUZCH02

Mathematical Modeling and Optimization of Beam Dynamics in Accelerators

controls, focusing, quadrupole, electromagnetic-fields

68

D.A. Ovsyannikov
St. Petersburg State University, St. Petersburg, Russia

In this paper we treat the problem of beam dynamics optimization as a control theory problems. We consider different mathematical model of optimization. The approach to solving optimization problem for charged particle dynamics in accelerators includes: construction of mathematical model of controlled dynamical process; choice of control functions or parameters of optimization; construction of quality functionals, which allow efficient evaluation of various characteristics of examined controlled motion; analytical representation of the functional variations, which allow to construct various methods of optimization for quality functionals; construction of methods and algorithms of optimization. Problem of statement is considered on the pattern of RFQ channel.

Slides TUZCH02 [1.601 MB]

TUCCH02

Beam Dynamics Investigations for 433 MHz RFQ Accelerator

emittance, focusing, ion, injection

82

Y.A. Svistunov
NIIEFA, St. Petersburg, Russia
A.P. Durkin
MRTI RAS, Moscow, Russia
A.D. Ovsyannikov
St. Petersburg State University, St. Petersburg, Russia

Modeling results for deuteron dynamics in RFQ structure with operational frequency 433 MHz and 1 MeV output energy are presented. The results are compared with experimental data. The purpose of investigation is to find optimal input RFQ emittance parameters for off-nominal values of input current and vane voltage.

Slides TUCCH02 [0.642 MB]

WEBCH01

The Status of the SARAF Phase-I Linac

linac, target, proton, status

103

L. Weissman, Y. Ben Aliz, D. Berkovits, O. Dudovich, I. Eliyahu, I. Fishman, I.G. Gertz, A. Grin, A. Kreisler, G. Lempert, I. Mardor, A. Perry, E. Reinfeld, J. Rodnizki
Soreq NRC, Yavne, Israel

Phase I of the Soreq Applied Research Accelerator Facility - SARAF is under operation at the Soreq Nuclear Research Center. According to Phase I design specifications, SARAF superconducting linear RF accelerator should yield 2 mA protons and deuterons CW beams at energies up to 4 and 5 MeV, respectively. The status of Phase I main components is reported as well as the beam operation experience accumulated recently. The latter include acceleration of a 1 mA CW protons beam up to 3.5 MeV and 1 mA pulsed, duty cycle of few %, deuterons beam to up to 4.7 MeV. Further planned improvements in the current facility and plans for the future Phase II of the SARAF linac are discussed.

Slides WEBCH01 [7.617 MB]

TUPPB010

RF Quadrupole Focusing Lattices

focusing, lattice, 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.

TUPPB020

Mathematical Model of Beam Dynamics Optimization in Traveling Wave

controls, acceleration, injection, resonance

355

A.D. Ovsyannikov, A.Yu. Shirokolobov
St. Petersburg State University, St. Petersburg, Russia

In works by B.I. Bondarev, A.P. Durkin, A.D. Ovsyannikov mathematical model of optimization of of charged particles dynamics in RFQ accelerators was proposed. In this paper a new mathematical model of optimization of particle dynamics in traveling wave is considered. Joint optimization model of program and disturbed motions is investigated.

TUPPB025

Investigation of Program and Perturbed Motions of Particles in Linear Accelerator

controls, electron, resonance, simulation

367

I.D. Rubtsova, E.N. Suddenko
St. Petersburg State University, St. Petersburg, Russia

Beam control model for program and perturbed motions with interaction account is realized. Quality functional gradient is obtained.

TUPPB059

Low Energy Channel for Modernized LU-20

ion, emittance, solenoid, linac

442

V. Aleksandrov, A. Govorov, V. Monchinsky, G.V. Trubnikov
JINR, Dubna, Moscow Region, Russia

The modernization of LU-20 accelerator expects change existing electrostatic for-injector on RFQ type pre-accelerator. Low energy channel of transportation of beams is offered from three sources of ions: ESIS, LIS and SPIon - to RFQ. Parameters of channel and results of numerical modeling on fitting beams parameters with acceptance of RFQ are presented.

WEPPC002

RF Design and Tuning of Linac4 RFQ

linac, dipole, quadrupole, controls

448

A. France, M. Desmons, O. Piquet
CEA/DSM/IRFU, France
C. Rossi
CERN, Geneva, Switzerland

In the Linac4 (a part of CERN accelerator complex upgrade), a 3 MeV, 3-meter long, 352 MHz RFQ accelerates a 70 mA H⁻ ion beam from source to DTL input energy. RF design and tuning both rely on the same 4-wire transmission model (TLM), which ensures a consistent control of all RF parameters. 3D simulations are used to determine electrical parameters of TLM in the design process. RFQ end-circuits are designed to minimize sensitivity of RFQ voltage profile to perturbations that might occur during operation, and are tuned with quadrupole rods. Slug tuners size and distribution take into account fabrication tolerances and bead-pull measurement constraints. The three 1-meter long RFQ sections are machined and brazed in CERN. RF bead-pull measurements used to estimate RFQ electrical parameters throughout fabrication steps have not revealed any significant departure from expected values. Vacuum ports position is also adjusted prior to braze using RF measurements. Electrical parameters of end-circuits are derived from sets of five linearly independent bead-pull measurements. Slugs are tuned using a closed-loop algorithm, where "command" quantities are tuner positions, "control" quantities are measured fields, and RFQ inverse transfer function is based on the TLM. Tuning convergence and final accuracy will be presented.

WEPPC011

Modernisation of an Initial Part the MILAC Heavy Ion Linear Accelerator

ion, acceleration, site, heavy-ion

466

V.A. Bomko, A.P. Kobets, V.V. Panov, K.V. Pavlij, G.V. Sotnikov, B.V. Zajtsev
NSC/KIPT, Kharkov, Ukraine

New pre-stripping section (PSS-20) the MILAC heavy ion linear accelerator with the relation of their mass to charge A/q=20 is developed. That will allow to extend considerably a range accelerating ions and to increase intensity of beams. On an initial part of acceleration of ions from 6 keV/u up to 150 keV/u high capture in process of acceleration of the injected ions is provided interdigital (IH) accelerating structure with Radio-Frequency Quadrupole (RFQ) focusing. On the second part of acceleration of ions from 150 keV/u up to 1 MeV/u the highest rate of acceleration is created interdigital (IH) accelerating structure with drift tubes. Mathematical modeling geometrical and dynamic characteristics of accelerating structures pre-stripping section PSS-20 is executed. Dynamics of heavy ions in the course of acceleration is optimised.

WEPPC013

Novel DTL Section for ITEP-TWAC Heavy Ion Injector

quadrupole, simulation, ion, DTL

469

V. Andreev, N.N. Alexeev, A. Kolomiets, V.A. Koshelev
ITEP, Moscow, Russia
A.S. Plastun
MEPhI, Moscow, Russia

A novel 81.5 MHz H-type drift tube (DTL) accelerating structure with rf quadrupoles following RFQ in the new injector I-4 for acceleration ions up to energy about 5 MeV/u for ITEP TWAC facility has been proposed. It is based on a combination of a DTL structure and the resonator with magnetic coupling windows. Computer simulations show that it can provide some advantages in comparison with conventional IH-DTL structure. Results of both electrodynamics and beam dynamics computer simulations of the structure as well as a new approach for beam matching RFQ and the section are presented.