RuPAC2014 - List of Keywords (resonance)

Paper	Title	Other Keywords	Page
TUCA04	Mechanism of Compression of Positron Clouds in the Surko Trap of the LEPTA Facility	positron, plasma, electron, accumulation	20
	M.K. Eseev, E.V. Ahmanova, A.G. Kobets, I.N. Meshkov, O. Orlov, A.A. Sidorin, S. Yakovenko JINR, Dubna, Moscow Region, Russia M.K. Eseev NAFU, Arkhangelsk, Russia A.G. Kobets IERT, Kharkov, Ukraine
	Results from experimental studies of plasma storage in the Surko trap at the LEPTA facility are presented. The number of stored particles is found to increase substantially when using the socalled "rotating wall" method, in which a transverse rotating electric field generated by a cylindrical segmented electrode cut into four pairs is applied to the positrons storage region. The conditions of transverse compression of the plasma bunch under the action of the rotating field and buffer gas are studied. The optimal storage parameters are determined for these experimental conditions. Mechanisms of the action of the rotating field and buffer gas on the process of positron clouds storage are presented.

TUPSA18	Complex Shunt Impedance and Beam-RF Cavity Interaction	cavity, impedance, damping, experiment	77
	V.G. Kurakin LPI, Moscow, Russia
	Two approaches usually are used to describe beam-cavity interaction in accelerator based applications. The first one is electro dynamical and uses Maxwell equations to derive appropriate equations, field modes expressions being necessary to calculate field amplitudes excited by moving charges in the cavity. The other one uses LC circuit to derive appropriate equations for voltage amplitude induced in cavity by accelerated bunches, thin accelerating gap to some extent being not fully correctly defined representation in such approach. In this paper, the expressions are derived that describe beam-RF cavity interactions in terms of so called complex shunt impedance, strict electro dynamical approach being used in calculations. It is shown that complex shunt impedance module coincides completely with usual shunt impedance definition that up to now is used widely to describe rf cavity efficiency. The physical sense of its phase is given in the paper as well. Both complex shunt impedance module and its phase can be calculated or measured experimentally.

WECA11	CC-18/9M Cyclotron System	cyclotron, target, vacuum, ion	149
	A.P. Strokach, M.A. Emeljanov, A.V. Galchuck, Yu.N. Gavrish, S.V. Grigorenko, V.I. Grigoriev, M.L. Klopenkov, A.N. Kuzhlev, V.G. Mudroliubov, G.V. Muraviov, V.I. Nikishkin, V.I. Ponomarenko, Yu.I. Stogov, S.S. Tsygankov, O.L. Veresov NIIEFA, St. Petersburg, Russia
	The СС-18/9M cyclotron system has been designed, manufactured and delivered to NIITFA, Moscov. The system consists of an updated cyclotron and a targets system. The cyclotron is intended to produce proton and deuteron beams with an energy of 12-18/6-9 MeV and current up to 150/70 mkA. For this purpose, a shielding-type electromagnet and a resonance system have been afresh designed. The target system for the production of F-18 and C-11 radionuclides has been designed in NIIEFA for the first time.
	Slides WECA11 [0.547 MB]

THPSC20	Multipactor in Elliptical Cavities 800 MHz	cavity, electron, damping, HOM	365
	M. Gusarova, I.I. Petrushina MEPhI, Moscow, Russia
	The studies of the multipacting discharge possibility in elliptic single-cell cavities at 800 MHz with three types of hifger order modes couplers were done. The ranges of the field gradients where the conditions for the occurrence of first order multipacting discharge in the equatorial region, as well as the HOM field levels were determined.

Paper

Title

Other Keywords

Page

TUCA04

Mechanism of Compression of Positron Clouds in the Surko Trap of the LEPTA Facility

positron, plasma, electron, accumulation

20

M.K. Eseev, E.V. Ahmanova, A.G. Kobets, I.N. Meshkov, O. Orlov, A.A. Sidorin, S. Yakovenko
JINR, Dubna, Moscow Region, Russia
M.K. Eseev
NAFU, Arkhangelsk, Russia
A.G. Kobets
IERT, Kharkov, Ukraine

Results from experimental studies of plasma storage in the Surko trap at the LEPTA facility are presented. The number of stored particles is found to increase substantially when using the socalled "rotating wall" method, in which a transverse rotating electric field generated by a cylindrical segmented electrode cut into four pairs is applied to the positrons storage region. The conditions of transverse compression of the plasma bunch under the action of the rotating field and buffer gas are studied. The optimal storage parameters are determined for these experimental conditions. Mechanisms of the action of the rotating field and buffer gas on the process of positron clouds storage are presented.

TUPSA18

Complex Shunt Impedance and Beam-RF Cavity Interaction

cavity, impedance, damping, experiment

77

V.G. Kurakin
LPI, Moscow, Russia

Two approaches usually are used to describe beam-cavity interaction in accelerator based applications. The first one is electro dynamical and uses Maxwell equations to derive appropriate equations, field modes expressions being necessary to calculate field amplitudes excited by moving charges in the cavity. The other one uses LC circuit to derive appropriate equations for voltage amplitude induced in cavity by accelerated bunches, thin accelerating gap to some extent being not fully correctly defined representation in such approach. In this paper, the expressions are derived that describe beam-RF cavity interactions in terms of so called complex shunt impedance, strict electro dynamical approach being used in calculations. It is shown that complex shunt impedance module coincides completely with usual shunt impedance definition that up to now is used widely to describe rf cavity efficiency. The physical sense of its phase is given in the paper as well. Both complex shunt impedance module and its phase can be calculated or measured experimentally.

WECA11

CC-18/9M Cyclotron System

cyclotron, target, vacuum, ion

149

A.P. Strokach, M.A. Emeljanov, A.V. Galchuck, Yu.N. Gavrish, S.V. Grigorenko, V.I. Grigoriev, M.L. Klopenkov, A.N. Kuzhlev, V.G. Mudroliubov, G.V. Muraviov, V.I. Nikishkin, V.I. Ponomarenko, Yu.I. Stogov, S.S. Tsygankov, O.L. Veresov
NIIEFA, St. Petersburg, Russia

The СС-18/9M cyclotron system has been designed, manufactured and delivered to NIITFA, Moscov. The system consists of an updated cyclotron and a targets system. The cyclotron is intended to produce proton and deuteron beams with an energy of 12-18/6-9 MeV and current up to 150/70 mkA. For this purpose, a shielding-type electromagnet and a resonance system have been afresh designed. The target system for the production of F-18 and C-11 radionuclides has been designed in NIIEFA for the first time.

Slides WECA11 [0.547 MB]

THPSC20

Multipactor in Elliptical Cavities 800 MHz

cavity, electron, damping, HOM

365

M. Gusarova, I.I. Petrushina
MEPhI, Moscow, Russia

The studies of the multipacting discharge possibility in elliptic single-cell cavities at 800 MHz with three types of hifger order modes couplers were done. The ranges of the field gradients where the conditions for the occurrence of first order multipacting discharge in the equatorial region, as well as the HOM field levels were determined.