RUPAC2012 - List of Authors (Altmark, A.)

Paper	Title	Page
MOPPA008	Parameter Optimization of a Rectangular Dielectric Based Wakefield Accelerating Structure	260
	S. Baturin, A. Altmark, I.L. Sheynman LETI, Saint-Petersburg, Russia A. Kanareykin Euclid TechLabs, LLC, Solon, Ohio, USA
	With this talk, we present the algorithm and simulation results of the wakefield parametric study of the rectangular dielectric based wakefield accelerating structure. Analytical solution of the wakefield generation in the rectangular dielectric structure has been considered to achieve optimal relations between both the geometrical parameters and dielectric constant of the structure, and the beam parameters like bunch charge and bunch length. Optimization has been carried out for maximization of the accelerating gradient at the single LSM11 mode approximation.

TUPPB029	Transverse Dynamics of a Ring Beam in a Coaxial Two-Channel Dielectric Waveguide	379
	A. Altmark LETI, Saint-Petersburg, Russia A. Kanareykin Euclid TechLabs, LLC, Solon, Ohio, USA
	The most critical issue of wakefield accelerating schemes is transformer ratio (maximum energy gain of the witness bunch/maximum energy loss of the drive bunch) which cannot exceed 2 in collinear wakefield accelerator with use of Gaussian bunches. We observe new scheme of wakefield acceleration in collinear two-channel waveguide where accelerating field created by electron bunch with annular charge distribution passing in vacuum layer. This radiation is used for acceleration of witness beam which passing through central vacuum channel. These vacuumareas separated by dielectric tube. Transformer ratio for this scheme can be much greater than 2. The main problem of wakefield accelerators is transverse beam dynamics of the driver bunch, because of high value of its charge and low energy of the particles. We present results of the beam dynamics calculation of the annular drive beam by "macroparticle" method based on analytical expressions for Cerenkov radiation. The upgraded BBU-3000 code has been used for calculation of the beam dynamics in coaxial dielectric wakefield accelerating structures. It is shown that dynamics depends on radial and azimuthally structures of HEM modes excited by the drive beam there. Initial beam imperfections to the beam dynamics was carried out.

Paper

Title

Page

Parameter Optimization of a Rectangular Dielectric Based Wakefield Accelerating Structure

260

S. Baturin, A. Altmark, I.L. Sheynman
LETI, Saint-Petersburg, Russia
A. Kanareykin
Euclid TechLabs, LLC, Solon, Ohio, USA

With this talk, we present the algorithm and simulation results of the wakefield parametric study of the rectangular dielectric based wakefield accelerating structure. Analytical solution of the wakefield generation in the rectangular dielectric structure has been considered to achieve optimal relations between both the geometrical parameters and dielectric constant of the structure, and the beam parameters like bunch charge and bunch length. Optimization has been carried out for maximization of the accelerating gradient at the single LSM11 mode approximation.

TUPPB029

Transverse Dynamics of a Ring Beam in a Coaxial Two-Channel Dielectric Waveguide

379

A. Altmark
LETI, Saint-Petersburg, Russia
A. Kanareykin
Euclid TechLabs, LLC, Solon, Ohio, USA

The most critical issue of wakefield accelerating schemes is transformer ratio (maximum energy gain of the witness bunch/maximum energy loss of the drive bunch) which cannot exceed 2 in collinear wakefield accelerator with use of Gaussian bunches. We observe new scheme of wakefield acceleration in collinear two-channel waveguide where accelerating field created by electron bunch with annular charge distribution passing in vacuum layer. This radiation is used for acceleration of witness beam which passing through central vacuum channel. These vacuumareas separated by dielectric tube. Transformer ratio for this scheme can be much greater than 2. The main problem of wakefield accelerators is transverse beam dynamics of the driver bunch, because of high value of its charge and low energy of the particles. We present results of the beam dynamics calculation of the annular drive beam by "macroparticle" method based on analytical expressions for Cerenkov radiation. The upgraded BBU-3000 code has been used for calculation of the beam dynamics in coaxial dielectric wakefield accelerating structures. It is shown that dynamics depends on radial and azimuthally structures of HEM modes excited by the drive beam there. Initial beam imperfections to the beam dynamics was carried out.