RUPAC2012 - List of Authors (Alexeev, N.N.)

Paper

Title

Page

ITEP-TWAC Renewal and Upgrading Program

112

N.N. Alexeev, P.N. Alekseev, V. Andreev, A. Balabaev, A.I. Balabin, V.N. Balanutsa, A. Golubev, M.M. Kats, V.I. Nikolaev, A.S. Ryabtsev, Yu.A. Satov, V.A. Schegolev, B.Y. Sharkov, A. Shumshurov, V. Stolbunov, V.P. Zavodov
ITEP, Moscow, Russia

The ITEP-TWAC facility has been put out of operation this year as a result of some equipment damage by the fire, so the program of machine renewal and its equipment upgrading for accelerated beams parameters improvement and experimental area extension is elaborated. Main items of this program and status of machine restoration activity are presented.

Slides WEZCH01 [3.050 MB]

FRBCH07

Transformation of Beams in the Plasma Lens and Investigation of Z-Pinch Dynamics

239

A.A. Drozdovsky, N.N. Alexeev, S.A. Drozdovsky, A. Golubev, Yu.B. Novozhilov, P.V. Sasorov, S.M. Savin, V.V. Yanenko
ITEP, Moscow, Russia

Funding: Work supported by the Russian Foundation for Basic Research
The plasma lens can carry out sharp focusing of ion beam with considerable reduction sizes of focal spot. At those stages of the plasma discharge at which the magnetic field is nonlinear, formation of other interesting configurations of beams is possible. The report presents the results of studies transformation the Gaussian beam into hollow one and into beam with homogeneous spatial distribution. The discharge current distributions obtained by numerical calculation ensure the experimental beam transformations. Thus possibility of the research of the plasma discharge dynamics by means of relativistic ions beams is shown. The plasma lens represents the universal device for scientific and technical applications in particular for irradiation of medical objects.

Slides FRBCH07 [1.390 MB]

TUPPB018

Simulation of Hollow Ion Beam Formation Line

353

H.Y. Barminova, N.N. Alexeev, A. Golubev, T. Kulevoy, A. Sitnikov, T. Tretyakova
ITEP, Moscow, Russia

Heavy ion beams can be used for the matter extreme state generation*, and forming line must satisfy to certain strict requirements for beam brightness and focus position. In paper** system was proposed for hollow beam formation in order to generate laboratory plasma with energy deposition in cylindrical target. The system is based on the principle of the beam rotation by means of RF-cavities (so called "wobbler"). The similar system is proposed in ITEP***, where the basic part of line consists of two four-cell cavities and focusing quadrupole triplet. To calculate wobbler and magnetic triplet parameters two codes were used – "Transit", developed in ITEP, and G4Beamline, developed in Muons Inc. The beam was simulated for two kinds of particles – multicharged ions of Со and protons with equivalent energy. A comparative analysis of optical system parameter and beam parameter obtained in both simulations was performed. In condition of focus position restriction and spot geometry required aberrations were shown to be taken into account correctly.
* V. Fortov et al. NIM A 415, p.20 (1998).
** S. Minaev et al. NIM A 620, р.99 (2010).
*** S. Kolesnikov et al. High Pressure Research, vol.30, No 1, p.83 (2010).

WEPPC013

Novel DTL Section for ITEP-TWAC Heavy Ion Injector

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	Page
WEZCH01	ITEP-TWAC Renewal and Upgrading Program	112
	N.N. Alexeev, P.N. Alekseev, V. Andreev, A. Balabaev, A.I. Balabin, V.N. Balanutsa, A. Golubev, M.M. Kats, V.I. Nikolaev, A.S. Ryabtsev, Yu.A. Satov, V.A. Schegolev, B.Y. Sharkov, A. Shumshurov, V. Stolbunov, V.P. Zavodov ITEP, Moscow, Russia
	The ITEP-TWAC facility has been put out of operation this year as a result of some equipment damage by the fire, so the program of machine renewal and its equipment upgrading for accelerated beams parameters improvement and experimental area extension is elaborated. Main items of this program and status of machine restoration activity are presented.
	Slides WEZCH01 [3.050 MB]

FRBCH07	Transformation of Beams in the Plasma Lens and Investigation of Z-Pinch Dynamics	239
	A.A. Drozdovsky, N.N. Alexeev, S.A. Drozdovsky, A. Golubev, Yu.B. Novozhilov, P.V. Sasorov, S.M. Savin, V.V. Yanenko ITEP, Moscow, Russia
	Funding: Work supported by the Russian Foundation for Basic Research The plasma lens can carry out sharp focusing of ion beam with considerable reduction sizes of focal spot. At those stages of the plasma discharge at which the magnetic field is nonlinear, formation of other interesting configurations of beams is possible. The report presents the results of studies transformation the Gaussian beam into hollow one and into beam with homogeneous spatial distribution. The discharge current distributions obtained by numerical calculation ensure the experimental beam transformations. Thus possibility of the research of the plasma discharge dynamics by means of relativistic ions beams is shown. The plasma lens represents the universal device for scientific and technical applications in particular for irradiation of medical objects.
	Slides FRBCH07 [1.390 MB]

TUPPB018	Simulation of Hollow Ion Beam Formation Line	353
	H.Y. Barminova, N.N. Alexeev, A. Golubev, T. Kulevoy, A. Sitnikov, T. Tretyakova ITEP, Moscow, Russia
	Heavy ion beams can be used for the matter extreme state generation, and forming line must satisfy to certain strict requirements for beam brightness and focus position. In paper* system was proposed for hollow beam formation in order to generate laboratory plasma with energy deposition in cylindrical target. The system is based on the principle of the beam rotation by means of RF-cavities (so called "wobbler"). The similar system is proposed in ITEP**, where the basic part of line consists of two four-cell cavities and focusing quadrupole triplet. To calculate wobbler and magnetic triplet parameters two codes were used – "Transit", developed in ITEP, and G4Beamline, developed in Muons Inc. The beam was simulated for two kinds of particles – multicharged ions of Со and protons with equivalent energy. A comparative analysis of optical system parameter and beam parameter obtained in both simulations was performed. In condition of focus position restriction and spot geometry required aberrations were shown to be taken into account correctly. V. Fortov et al. NIM A 415, p.20 (1998). S. Minaev et al. NIM A 620, р.99 (2010). * S. Kolesnikov et al. High Pressure Research, vol.30, No 1, p.83 (2010).

WEPPC013	Novel DTL Section for ITEP-TWAC Heavy Ion Injector	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.