PAC2013 - List of Authors (Antipov, S.P.)

Paper

Title

Page

Beam Pulse Shaping Experiments for Uniform High Gradient Dielectric Wakefield Acceleration

117

D.Y. Shchegolkov, E.I. Simakov
LANL, Los Alamos, New Mexico, USA
S.P. Antipov
Euclid TechLabs, LLC, Solon, Ohio, USA
S.P. Antipov
ANL, Argonne, USA
M.G. Fedurin, C. Swinson
BNL, Upton, Long Island, New York, USA

Funding: Work is supported by the U.S. Department of Energy (DOE) through the Laboratory Directed Research and Development (LDRD) program at Los Alamos National Laboratory.
Dielectric wakefield accelerators (DWA) can produce high accelerating gradients and are planned to be used as afterburners for the accelerators of future free electron lasers (FELs) such as X-ray FEL of the proposed Matter-Radiation Interactions in Extremes (MaRIE) experimental facility at LANL. With a double triangular drive bunch DWAs can produce a high transformer ratio. Also, by slightly customizing the time shape of the accelerated bunch it is possible to achieve high gradient uniformity along the accelerated bunch resulting in low induced energy spread. We plan to test a DWA which would incorporate all those benefits. We are going to obtain a desired current profile of the main and drive bunches from a single large-charge beam using one of the known pulse shaping techniques employing a mask.* ** *** We will report our recent beam shaping experiments at BNL for a transformer ratio test. We used a 58 MeV energy chirped electron beam and a single dogleg with a beam mask inserted in a region where the beam transverse size was dominated by the correlated energy chirp. Both measurement results and Elegant simulation data will be presented.
*P. Emma, Z. Huang , et al, Phys Rev ST Accel Beams 9, 100702 (2006).
**P. Muggli, V. Yakimenko, et al, PRL 101, 054801 (2008).
***D. Xiang and A. Chao, SLAC-PUB-14428 (2011).

MOPAC12

Analysis of High Repetition Rate Effects in Dielectric Wakefield Accelerators

93

P. Schoessow, S.P. Antipov, C.-J. Jing, A. Kanareykin, S.S. Zuo
Euclid TechLabs, LLC, Solon, Ohio, USA
J.G. Power, A. Zholents
ANL, Argonne, USA

Recently the question has arisen of whether dielectric charging might become a significant limiting effect on the performance of the dielectric wakefield undulator, leading either to deflection of the beam by the static electric field generated, or to catastrophic breakdown of the structure. In experiments to date this has not been problematic with appropriate choice of dielectric material. However, given the high repetition rate that would be required, the device would be subjected to essentially a dc bombardment from the beam halo and thus be vulnerable to these effects because there is no time between machine pulses for discharge of the dielectric. We have begun reexamining this problem, emphasizing the expected charging rate and charge distribution in a thin walled dielectric device and the physics of conductivity and discharge phenomena in a dielectric medium. Simulations of the charging process and halo formation will be presented. We will review early work on beam-induced charging of dielectric structures and also results from deep charging of satellite components by cosmic rays. Ageing and induced conductivity under large radiation doses are also investigated.

MOPHO19

A Tunable Energy Chirp Correction

279

S.P. Antipov, C.-J. Jing, A. Kanareykin, P. Schoessow
Euclid TechLabs, LLC, Solon, Ohio, USA
S. Baturin
LETI, Saint-Petersburg, Russia
M.G. Fedurin, C. Swinson
BNL, Upton, Long Island, New York, USA
W. Gai, A. Zholents
ANL, Argonne, USA

Funding: DOE SBIR
Short (subpicosecond) pulses are central to many of the next generation light source initiatives that are based on linear accelerators. Beam compression is performed by means of a chicane utilizing a correlated linear energy chirp. The small energy chirp is kept as the beam goes through the remaining accelerating stage to compensate for wakefield effects. It is necessary to compensate the residual energy spread before the beam enters the undulator stage. We present here a concept for a passive wakefield device- the wakefield silencer- to perform this compensation. We have recently demonstrated a passive energy chirp correction by self-wakefield at the Brookhaven ATF facility. In this paper we present a progress report on development of these tunable chirp correction devices.

TUPMA08

Subpicosecond Bunch Train Production for High Power Tunable THz Source

604

S.P. Antipov, C.-J. Jing, A. Kanareykin, P. Schoessow
Euclid TechLabs, LLC, Solon, Ohio, USA
M.G. Fedurin
BNL, Upton, Long Island, New York, USA
W. Gai, A. Zholents
ANL, Argonne, USA
V. Yakimenko
SLAC, Menlo Park, California, USA

Funding: DOE SBIR
An effective method of introducing an energy modulation in an electron bunch by passing it through a dielectric-lined waveguide was recently demonstrated. In the follow up experiment we successfully converted this energy modulation into a density modulation by means of a chicane beamline. The density modulated beam was sent through a foil target, producing THz transition radiation which was characterized using interferometeric techniques. By changing the initial energy chirp of the beam we tuned the center frequency of the generated THz radiation in the range 0.5 - 1 THz. A table top high power narrowband tunable THz source based on this technique is proposed

THYBA1

Dielectric Wakefield Acceleration and Tests in the BNL ATF and SLAC FACET Facilities

S.P. Antipov
Euclid TechLabs, LLC, Solon, Ohio, USA

In this presentation we will review Dielectric Wakefield Acceleration (DWA) methods and related concepts. Recent results obtained at SLAC FACET, BNL ATF and other facilities will be presented and possible applications outlined.

Slides THYBA1 [8.537 MB]

Paper	Title	Page
MOPAC24	Beam Pulse Shaping Experiments for Uniform High Gradient Dielectric Wakefield Acceleration	117
	D.Y. Shchegolkov, E.I. Simakov LANL, Los Alamos, New Mexico, USA S.P. Antipov Euclid TechLabs, LLC, Solon, Ohio, USA S.P. Antipov ANL, Argonne, USA M.G. Fedurin, C. Swinson BNL, Upton, Long Island, New York, USA
	Funding: Work is supported by the U.S. Department of Energy (DOE) through the Laboratory Directed Research and Development (LDRD) program at Los Alamos National Laboratory. Dielectric wakefield accelerators (DWA) can produce high accelerating gradients and are planned to be used as afterburners for the accelerators of future free electron lasers (FELs) such as X-ray FEL of the proposed Matter-Radiation Interactions in Extremes (MaRIE) experimental facility at LANL. With a double triangular drive bunch DWAs can produce a high transformer ratio. Also, by slightly customizing the time shape of the accelerated bunch it is possible to achieve high gradient uniformity along the accelerated bunch resulting in low induced energy spread. We plan to test a DWA which would incorporate all those benefits. We are going to obtain a desired current profile of the main and drive bunches from a single large-charge beam using one of the known pulse shaping techniques employing a mask.* * We will report our recent beam shaping experiments at BNL for a transformer ratio test. We used a 58 MeV energy chirped electron beam and a single dogleg with a beam mask inserted in a region where the beam transverse size was dominated by the correlated energy chirp. Both measurement results and Elegant simulation data will be presented. P. Emma, Z. Huang , et al, Phys Rev ST Accel Beams 9, 100702 (2006). P. Muggli, V. Yakimenko, et al, PRL 101, 054801 (2008). **D. Xiang and A. Chao, SLAC-PUB-14428 (2011).

MOPAC12	Analysis of High Repetition Rate Effects in Dielectric Wakefield Accelerators	93
	P. Schoessow, S.P. Antipov, C.-J. Jing, A. Kanareykin, S.S. Zuo Euclid TechLabs, LLC, Solon, Ohio, USA J.G. Power, A. Zholents ANL, Argonne, USA
	Recently the question has arisen of whether dielectric charging might become a significant limiting effect on the performance of the dielectric wakefield undulator, leading either to deflection of the beam by the static electric field generated, or to catastrophic breakdown of the structure. In experiments to date this has not been problematic with appropriate choice of dielectric material. However, given the high repetition rate that would be required, the device would be subjected to essentially a dc bombardment from the beam halo and thus be vulnerable to these effects because there is no time between machine pulses for discharge of the dielectric. We have begun reexamining this problem, emphasizing the expected charging rate and charge distribution in a thin walled dielectric device and the physics of conductivity and discharge phenomena in a dielectric medium. Simulations of the charging process and halo formation will be presented. We will review early work on beam-induced charging of dielectric structures and also results from deep charging of satellite components by cosmic rays. Ageing and induced conductivity under large radiation doses are also investigated.

MOPHO19	A Tunable Energy Chirp Correction	279
	S.P. Antipov, C.-J. Jing, A. Kanareykin, P. Schoessow Euclid TechLabs, LLC, Solon, Ohio, USA S. Baturin LETI, Saint-Petersburg, Russia M.G. Fedurin, C. Swinson BNL, Upton, Long Island, New York, USA W. Gai, A. Zholents ANL, Argonne, USA
	Funding: DOE SBIR Short (subpicosecond) pulses are central to many of the next generation light source initiatives that are based on linear accelerators. Beam compression is performed by means of a chicane utilizing a correlated linear energy chirp. The small energy chirp is kept as the beam goes through the remaining accelerating stage to compensate for wakefield effects. It is necessary to compensate the residual energy spread before the beam enters the undulator stage. We present here a concept for a passive wakefield device- the wakefield silencer- to perform this compensation. We have recently demonstrated a passive energy chirp correction by self-wakefield at the Brookhaven ATF facility. In this paper we present a progress report on development of these tunable chirp correction devices.

TUPMA08	Subpicosecond Bunch Train Production for High Power Tunable THz Source	604
	S.P. Antipov, C.-J. Jing, A. Kanareykin, P. Schoessow Euclid TechLabs, LLC, Solon, Ohio, USA M.G. Fedurin BNL, Upton, Long Island, New York, USA W. Gai, A. Zholents ANL, Argonne, USA V. Yakimenko SLAC, Menlo Park, California, USA
	Funding: DOE SBIR An effective method of introducing an energy modulation in an electron bunch by passing it through a dielectric-lined waveguide was recently demonstrated. In the follow up experiment we successfully converted this energy modulation into a density modulation by means of a chicane beamline. The density modulated beam was sent through a foil target, producing THz transition radiation which was characterized using interferometeric techniques. By changing the initial energy chirp of the beam we tuned the center frequency of the generated THz radiation in the range 0.5 - 1 THz. A table top high power narrowband tunable THz source based on this technique is proposed

THYBA1	Dielectric Wakefield Acceleration and Tests in the BNL ATF and SLAC FACET Facilities
	S.P. Antipov Euclid TechLabs, LLC, Solon, Ohio, USA
	In this presentation we will review Dielectric Wakefield Acceleration (DWA) methods and related concepts. Recent results obtained at SLAC FACET, BNL ATF and other facilities will be presented and possible applications outlined.
	Slides THYBA1 [8.537 MB]