IPAC2011 - List of Keywords (electromagnetic-fields)

Paper	Title	Other Keywords	Page
TUPC036	S-band ps Pulse Photoinjector for THz Radiation Source	coupling, electron, gun, acceleration	1078
	S.M. Polozov, T.V. Bondarenko MEPhI, Moscow, Russia
	S-band photoinjectors with ps pulse are becoming promising as e-guns for high-intensity sub-mm wavelength pulse source. Development of accelerating system for photoinjector with ps bunch is reported. The main aim is to develop a model of accelerating structure that provide top accelerating fields in respect to high electric strength and low RF power uses. The accelerating structures consisting of 1.6 cell of disk-loaded waveguide (DLW), 3 cells and 2 half-cells of DLW, 7 cels and 2 half-cells of DLW and accelerating structure based on running wave resonator with 7 cells and 2 half-cells of DLW are studying. The resonant models of these structures and the structures with power ports were designed. Electrodynamics characteristics, electric field distribution for all models were acquired. Accelerating structure consisting of 1.6 cells will operate in pi mode of standing wave, all other structures operate in pi/2 mode traveling wave. Accelerating structure based on running wave resonator with 7 cells and 2 half-cells of DLW has most suitable electrodynamics characteristics and field distribution for sub-mm pulse source according to simulation results.

WEPC107	Development of a Steady State Simulation Code for Klystron Amplifiers	cavity, space-charge, simulation, klystron	2265
	C. Marrelli CERN, Geneva, Switzerland M. Migliorati, A. Mostacci, L. Palumbo Rome University La Sapienza, Roma, Italy B. Spataro INFN/LNF, Frascati (Roma), Italy S.G. Tantawi SLAC, Menlo Park, California, USA
	The design of klystrons is based on the intensive utilization of simulation codes, which can evaluate the complete beam-cavities interaction in the case of large signals. In the present work, we present the development of a 2-D steady state simulation code that can self-consistently evaluate the effects of the electromagnetic field on the particles and of the particles back on the field. The algorithm is based on the iterative solution of the power balance equation in the RF structures and allows determining the amplitude and phase of the electromagnetic field starting from the cavity modes. Some applications of the code to a single cavity and a two cavity klystron are presented and compared with the results obtained from other codes. The effect of the space charge forces in the klystron drift tubes is also evaluated.

WEPC114	Covariant Formulation of the Vlasov Equation		2277
	O.I. Drivotin St. Petersburg State University, St. Petersburg, Russia
	In traditional approach, the Vlasov equation is considered as integro-differential equation. That formulation includes partial derivatives on phase coordinates. According to the covariant approach, physical relations should be presented by tensor equations. The main feature of the covariance is that any tensor equation can be written without using of coordinates. In covariant formulation of the Vlasov equation, we use such tensor objects as Lie derivatives. Classical and relativistic cases are described similarly. A difference between these two cases appears only in form of particle motion equations. Another feature of presented approach is consideration of degenerate distributions in the phase space. By degenerate distribution we mean a distribution having support of dimension smaller than dimension of the phase space. The simplest case of degenerate distribution is the distribution described by the Dirac measure. Another example is the Kapchinsky-Vladimirsky distribution, for which particles are distributed on the 3-dimensional surface in the 4-dimensional phase space.

THPC146	The Radiated EMI Isolation for TPS Kicker Magnet*	shielding, kicker, radiation, controls	3227
	C.S. Chen, C.K. Chan, C.L. Chen, Y.L. Chu, K.H. Hsu, C.Y. Kuo, Y.-H. Liu, C.-S. Yang NSRRC, Hsinchu, Taiwan
	Electromagnetic interference is a critical problem for electronic equipment, especially for those sophisticated measuring sensors using in TLS. Therefore, lots of efforts have been made to isolate the EM noise from the kicker magnets. In this article, different thicknesses of aluminum chambers are applied to block the radiated EM noise. Furthermore, the different widths of slits simulate the necessary openings on kicker assembly. According to the results of small-scale experiment, some parameters are obtained to design the enclosure of kicker magnet. Compared the results with the data from the original scale kicker, these parameters provide a believable guideline in the beginning of design status.

Paper

Title

Other Keywords

Page

TUPC036

S-band ps Pulse Photoinjector for THz Radiation Source

coupling, electron, gun, acceleration

1078

S.M. Polozov, T.V. Bondarenko
MEPhI, Moscow, Russia

S-band photoinjectors with ps pulse are becoming promising as e-guns for high-intensity sub-mm wavelength pulse source. Development of accelerating system for photoinjector with ps bunch is reported. The main aim is to develop a model of accelerating structure that provide top accelerating fields in respect to high electric strength and low RF power uses. The accelerating structures consisting of 1.6 cell of disk-loaded waveguide (DLW), 3 cells and 2 half-cells of DLW, 7 cels and 2 half-cells of DLW and accelerating structure based on running wave resonator with 7 cells and 2 half-cells of DLW are studying. The resonant models of these structures and the structures with power ports were designed. Electrodynamics characteristics, electric field distribution for all models were acquired. Accelerating structure consisting of 1.6 cells will operate in pi mode of standing wave, all other structures operate in pi/2 mode traveling wave. Accelerating structure based on running wave resonator with 7 cells and 2 half-cells of DLW has most suitable electrodynamics characteristics and field distribution for sub-mm pulse source according to simulation results.

WEPC107

Development of a Steady State Simulation Code for Klystron Amplifiers

cavity, space-charge, simulation, klystron

2265

C. Marrelli
CERN, Geneva, Switzerland
M. Migliorati, A. Mostacci, L. Palumbo
Rome University La Sapienza, Roma, Italy
B. Spataro
INFN/LNF, Frascati (Roma), Italy
S.G. Tantawi
SLAC, Menlo Park, California, USA

The design of klystrons is based on the intensive utilization of simulation codes, which can evaluate the complete beam-cavities interaction in the case of large signals. In the present work, we present the development of a 2-D steady state simulation code that can self-consistently evaluate the effects of the electromagnetic field on the particles and of the particles back on the field. The algorithm is based on the iterative solution of the power balance equation in the RF structures and allows determining the amplitude and phase of the electromagnetic field starting from the cavity modes. Some applications of the code to a single cavity and a two cavity klystron are presented and compared with the results obtained from other codes. The effect of the space charge forces in the klystron drift tubes is also evaluated.

WEPC114

Covariant Formulation of the Vlasov Equation

2277

O.I. Drivotin
St. Petersburg State University, St. Petersburg, Russia

In traditional approach, the Vlasov equation is considered as integro-differential equation. That formulation includes partial derivatives on phase coordinates. According to the covariant approach, physical relations should be presented by tensor equations. The main feature of the covariance is that any tensor equation can be written without using of coordinates. In covariant formulation of the Vlasov equation, we use such tensor objects as Lie derivatives. Classical and relativistic cases are described similarly. A difference between these two cases appears only in form of particle motion equations. Another feature of presented approach is consideration of degenerate distributions in the phase space. By degenerate distribution we mean a distribution having support of dimension smaller than dimension of the phase space. The simplest case of degenerate distribution is the distribution described by the Dirac measure. Another example is the Kapchinsky-Vladimirsky distribution, for which particles are distributed on the 3-dimensional surface in the 4-dimensional phase space.

THPC146

The Radiated EMI Isolation for TPS Kicker Magnet*

shielding, kicker, radiation, controls

3227

C.S. Chen, C.K. Chan, C.L. Chen, Y.L. Chu, K.H. Hsu, C.Y. Kuo, Y.-H. Liu, C.-S. Yang
NSRRC, Hsinchu, Taiwan

Electromagnetic interference is a critical problem for electronic equipment, especially for those sophisticated measuring sensors using in TLS. Therefore, lots of efforts have been made to isolate the EM noise from the kicker magnets. In this article, different thicknesses of aluminum chambers are applied to block the radiated EM noise. Furthermore, the different widths of slits simulate the necessary openings on kicker assembly. According to the results of small-scale experiment, some parameters are obtained to design the enclosure of kicker magnet. Compared the results with the data from the original scale kicker, these parameters provide a believable guideline in the beginning of design status.