2011 Particle Accelerator Conference - List of Authors (Rosenzweig, J.B.)

Paper

Title

Page

Inverse Free Electron Laser Accelerators for Driving Compact Light Sources and Detection Applications

1

A.M. Tremaine, S. Boucher, A.Y. Murokh
RadiaBeam, Santa Monica, USA
S.G. Anderson
LLNL, Livermore, California, USA
W.J. Brown
MIT, Cambridge, Massachusetts, USA
J.P. Duris, P. Musumeci, J.B. Rosenzweig
UCLA, Los Angeles, California, USA
I. Jovanovic
Penn State University, University Park, Pennsylvania, USA
I. Pogorelsky, M.N. Polyanskiy, V. Yakimenko
BNL, Upton, Long Island, New York, USA

Funding: Defense Threat Reduction Agency (DTRA)
Because of the broad application space for compact, 1-2 GeV accelerators, Inverse Free Electron Lasers (IFELs) are enjoying a rebirth of R&D funding. The efforts are under way in industry (RadiaBeam), academia (UCLA), and national laboratories (LLNL and BNL) to develop an ultra-compact IFEL energy booster for the photoinjector driven linear accelerating systems. The RUBICON collaboration integrates many of the institutions for proof-of-principle IFEL driven Inverse Compton Scattering (ICS) compact light source demonstrations. IFELs perform optimally in this mid-energy range, and given continual advances in laser technology, high average power IFELs with gradients well over 500 MeV/m are now feasible, leading to high quality, compact ICS and Free Electron Laser light sources. Importantly, IFEL operation can have excellent shot-to-shot energy stability, which is crucial when not only driving these light sources, but also for the downstream applications such as photofission, nuclear resonance fluorescence and standoff detection.

Slides MOOBN2 [2.625 MB]

MOP010

Resonance, Particle Stability, and Acceleration in the Micro-Accelerator Platform

121

J.C. McNeur, J.B. Rosenzweig, G. Travish, J. Zhou
UCLA, Los Angeles, USA
R.B. Yoder
Manhattanville College, Purchase, New York, USA

Funding: US Defense Threat Reduction Agency
A micron-scale dielectric-based slab-symmetric accelerator is currently being designed and fabricated at UCLA. This Micro-Accelerator Platform (MAP) accelerates electrons in a 800nm wide vacuum gap via a resonant accelerating mode excited by a side-coupled optical-wavelength laser. Detailed results of particle dynamics and field simulations are presented. In particular, we examine various methods of achieving net acceleration and particle stability. Additionally, structural designs that produce accelerating fields synchronous with both relativistic and sub-relativistic electrons are discussed.

MOP011

Standing Wakefield Accelerator Based on Periodic Dielectric Structures

124

X. Wei, G. Andonian, J.B. Rosenzweig, D. Stratakis
UCLA, Los Angeles, California, USA

In recent years dielectric wakefield accelerators (DWA) have attracted significant attention for applications in high energy physics and THz radiation sources. However, one needs sufficiently short driving bunches in order to take advantage of the DWA's scaling characteristics to achieve high gradient and high frequency accelerating fields. Since a single large charge Q driving bunch is difficult to be compressed to the needed rms bunch length, a driving bunch train with smaller Q and small emittance, should be used instead for the DWA. In view of this senario, the group velocity of the excited wakefields needs to be decreased to nearly zero, so the electromagnetic energy does not vacate the structure during the bunch train. In this paper we propose a standing wakefield accelerator based on periodic dielectric structures, and address the difference between the proposed structure and the conventional DWA.

MOP012

Ultra-High Gradient Compact S-Band Accelerating Structure

127

L. Faillace, R.B. Agustsson, P. Frigola, A.Y. Murokh
RadiaBeam, Santa Monica, USA
V.A. Dolgashev
SLAC, Menlo Park, California, USA
J.B. Rosenzweig
UCLA, Los Angeles, California, USA
V. Yakimenko
BNL, Upton, Long Island, New York, USA

Funding: Dept. of Energy DE-SC0000866
In this paper, we present the radio-frequency design of the DECA (Doubled Energy Compact Accelerator) S-band accelerating structure operating in the pi-mode at 2.856 GHz, where RF power sources are commonly available. The development of the DECA structure will offer an ultra-compact drop-in replacement for a conventional S-band linac in research and industrial applications such as drivers for compact light sources, medical and security systems. The electromagnetic design has been performed with the codes SuperFish and HFSS. The choice of the single cell shape derives from an optimization process aiming to maximize RF efficiency and minimize surface fields at very high accelerating gradients, i.e. 50 MV/m and above. Such gradients can be achieved utilizing shape-optimized elliptical irises, dual-feed couplers with the "fat-lip" coupling slot geometry, and specialized fabrication procedures developed for high gradient structures. The thermal-stress analysis of the DECA structure is also presented.
* V. Dolgashev, "Status of X-band Standing Wave Structure Studies at SLAC", SLAC-PUB-10124, (2003).
** C. Limborg et al., "RF Design of LCLS Gun", LCLS-TN-05-03 (2005).

MOP057

A SLAB Dielectric Structure as a Source of Wakefield Acceleration and THz Cherenkov Radiation Generation

211

D. Stratakis, G. Andonian, J.B. Rosenzweig, X. Wei
UCLA, Los Angeles, USA

Funding: Work is funded by US Dept. of Energy grant numbers DE-FG03-92ER40693.
Acceleration of electrons in wakefields set up by a series of drive bunches in a dielectric structure has been proposed as a possible component of next-generation accelerators. Here, we discuss future experimental work with a slab sub-millimeter dielectric loaded accelerator structure that in contrast to conventional dielectric tubes should diminish the effects of transverse wakes and will permit higher total charge to be accelerated. The proposed experiment will allow the generation of unprecedented peak power at THz frequencies. In addition, it can generate ~50-150 MV/m drive fields and thus will allow the testing of acceleration using witness and drive beams. We examine details of the geometry and composition of the structures to be used in the experiment.

WEODS4

High Gradient Normal Conducting Radio-Frequency Photoinjector System for Sincrotrone Trieste

1504

L. Faillace, R.B. Agustsson, P. Frigola
RadiaBeam, Santa Monica, USA
H. Badakov, A. Fukasawa, J.B. Rosenzweig, A. Yakub
UCLA, Los Angeles, USA
F. Cianciosi, P. Craievich, M. Trovò
ELETTRA, Basovizza, Italy
L. Palumbo
Rome University La Sapienza, Roma, Italy
B. Spataro
INFN/LNF, Frascati (Roma), Italy

Radiabeam Technologies is leading a multi-organizational collaboration by UCLA, INFN and MATS to deliver a high gradient normal conducting radio frequency (NCRF) 1.6 cell photoinjector system to the Sincrotrone Trieste facility. Designed to operate with a 120MV/m accelerating gradient, this dual feed, fat lipped racetrack coupler design is modeled after the LCLS photoinjector with a novel demountable cathode which permits cost effective cathode exchange. Full overview of the project to date will be discussed along with basic, design, engineering, manufacturing and RF test results.

Slides WEODS4 [3.186 MB]

THP050

Normal Conducting Radio Frequency X-band Deflecting Cavity Fabrication and Validation

2211

R.B. Agustsson, S. Boucher, L. Faillace, P. Frigola, A.Y. Murokh, S. Storms
RadiaBeam, Santa Monica, USA
D. Alesini
INFN/LNF, Frascati (Roma), Italy
V.A. Dolgashev, R.J. England
SLAC, Menlo Park, California, USA
J.B. Rosenzweig
UCLA, Los Angeles, California, USA
V. Yakimenko
BNL, Upton, Long Island, New York, USA

An X-band Traveling wave Deflector mode cavity (XTD) has been developed at Radiabeam Technologies to perform longitudinal characterization of the sub-picosecond ultra-relativistic electron beams. The device is optimized for the 100 MeV electron beam parameters at the Accelerator Test Facility (ATF) at Brookhaven National Laboratory, and is scalable to higher energies. The XTD is designed to operate at 11.424 GHz, and features short filling time, femtosecond resolution, and a small footprint. RF design, fabrication and RF validation and tuning will be presented.

THP164

Orbital Angular Momentum Light Generated via FEL at NLCTA

2420

A. Knyazik, E. Hemsing, A. Marinelli, J.B. Rosenzweig
UCLA, Los Angeles, California, USA

A scheme to create coherent light with orbital angular momentum (OAM) using Free Electron Laser (FEL) at NLCTA is proposed. An 795 nm light co-propagating with relativistic unmodulated electron beam is fed through a helical undulator tuned to the second harmonic of the laser, which acts as a pre-buncher that helically micro-bunches the beam, modulating it in energy. The energy modulation is transferred to helical density modulation by propagating through a longitudinally dispersive section, such as a chicane. Finally the helical density 3-D modulated electron beam is sent through a second undulator resonant at light’s fundamental frequency, causing the electron beam to radiate OAM light. NLCTA facility has everything to make this experiment, including a planar undulator tuned to the fundamental frequency, except for a helical pre-bunching undulator, which can be easily constructed and installed to generate OAM light at NLCTA. According to simulations generated with Mathematica 7 and Genesis 1.3 a 3 period long pre-buncher will be enough to get out 140 MW of laser power from a seeded 10 MW, after transversing a 1.5 m long planar radiator using electron beam generated by NLCTA.

TUODS4

Free Electron Laser Seeding Experiments at SPARC

L. Giannessi, F. Ciocci, G. Dattoli, M. Del Franco, A. Petralia, M. Quattromini, C. Ronsivalle, I.P. Spassovsky, V. Surrenti
ENEA C.R. Frascati, Frascati (Roma), Italy
D. Alesini, M. Bellaveglia, M. Castellano, E. Chiadroni, G. Di Pirro, M. Ferrario, D. Filippetto, A. Gallo, G. Gatti, A. Ghigo, E. Pace, B. Spataro, C. Vaccarezza
INFN/LNF, Frascati (Roma), Italy
A. Bacci, A.R. Rossi, L. Serafini
Istituto Nazionale di Fisica Nucleare, Milano, Italy
M. Bougeard, B. Carré, D. Garzella
CEA/DSM/DRECAM/SPAM, Gif-sur-Yvette, France
F. Briquez, M.-E. Couprie, M. Labat
SOLEIL, Gif-sur-Yvette, France
A. Cianchi
Università di Roma II Tor Vergata, Roma, Italy
F. Frassetto, L. P. Poletto
LUXOR, Padova, Italy
G. Lambert
LOA, Palaiseau, France
G. Marcus, P. Musumeci, J.B. Rosenzweig
UCLA, Los Angeles, California, USA
M. Migliorati, A. Mostacci, L. Palumbo
Rome University La Sapienza, Roma, Italy
M. Moreno, M. Serluca
INFN-Roma, Roma, Italy
V. Petrillo
Universita' degli Studi di Milano, Milano, Italy
J.V. Rau, V. Rossi Albertini
ISM-CNR, Rome, Italy
E. Sabia
ENEA Portici, Portici (Napoli), Italy
S. Spampinati
ELETTRA, Basovizza, Italy

We report on the recent activity at SPARC, which has successfully been operated in seeded mode. In the framework of the DS4 EUROFEL collaboration, a research work plan aiming at the investigation of seeded and cascaded FEL configurations was implemented. The main goal of the collaboration was to study the amplification and the harmonic generation process of an input seed signal. We describe here the first experimental results, with the observation of harmonics up to the 11th of the fundamental and the operation of the FEL in cascaded mode, driven both by seed generated in crystal and in gas (Ar).

Slides TUODS4 [8.947 MB]

Paper	Title	Page
MOOBN2	Inverse Free Electron Laser Accelerators for Driving Compact Light Sources and Detection Applications	1
	A.M. Tremaine, S. Boucher, A.Y. Murokh RadiaBeam, Santa Monica, USA S.G. Anderson LLNL, Livermore, California, USA W.J. Brown MIT, Cambridge, Massachusetts, USA J.P. Duris, P. Musumeci, J.B. Rosenzweig UCLA, Los Angeles, California, USA I. Jovanovic Penn State University, University Park, Pennsylvania, USA I. Pogorelsky, M.N. Polyanskiy, V. Yakimenko BNL, Upton, Long Island, New York, USA
	Funding: Defense Threat Reduction Agency (DTRA) Because of the broad application space for compact, 1-2 GeV accelerators, Inverse Free Electron Lasers (IFELs) are enjoying a rebirth of R&D funding. The efforts are under way in industry (RadiaBeam), academia (UCLA), and national laboratories (LLNL and BNL) to develop an ultra-compact IFEL energy booster for the photoinjector driven linear accelerating systems. The RUBICON collaboration integrates many of the institutions for proof-of-principle IFEL driven Inverse Compton Scattering (ICS) compact light source demonstrations. IFELs perform optimally in this mid-energy range, and given continual advances in laser technology, high average power IFELs with gradients well over 500 MeV/m are now feasible, leading to high quality, compact ICS and Free Electron Laser light sources. Importantly, IFEL operation can have excellent shot-to-shot energy stability, which is crucial when not only driving these light sources, but also for the downstream applications such as photofission, nuclear resonance fluorescence and standoff detection.
	Slides MOOBN2 [2.625 MB]

MOP010	Resonance, Particle Stability, and Acceleration in the Micro-Accelerator Platform	121
	J.C. McNeur, J.B. Rosenzweig, G. Travish, J. Zhou UCLA, Los Angeles, USA R.B. Yoder Manhattanville College, Purchase, New York, USA
	Funding: US Defense Threat Reduction Agency A micron-scale dielectric-based slab-symmetric accelerator is currently being designed and fabricated at UCLA. This Micro-Accelerator Platform (MAP) accelerates electrons in a 800nm wide vacuum gap via a resonant accelerating mode excited by a side-coupled optical-wavelength laser. Detailed results of particle dynamics and field simulations are presented. In particular, we examine various methods of achieving net acceleration and particle stability. Additionally, structural designs that produce accelerating fields synchronous with both relativistic and sub-relativistic electrons are discussed.

MOP011	Standing Wakefield Accelerator Based on Periodic Dielectric Structures	124
	X. Wei, G. Andonian, J.B. Rosenzweig, D. Stratakis UCLA, Los Angeles, California, USA
	In recent years dielectric wakefield accelerators (DWA) have attracted significant attention for applications in high energy physics and THz radiation sources. However, one needs sufficiently short driving bunches in order to take advantage of the DWA's scaling characteristics to achieve high gradient and high frequency accelerating fields. Since a single large charge Q driving bunch is difficult to be compressed to the needed rms bunch length, a driving bunch train with smaller Q and small emittance, should be used instead for the DWA. In view of this senario, the group velocity of the excited wakefields needs to be decreased to nearly zero, so the electromagnetic energy does not vacate the structure during the bunch train. In this paper we propose a standing wakefield accelerator based on periodic dielectric structures, and address the difference between the proposed structure and the conventional DWA.

MOP012	Ultra-High Gradient Compact S-Band Accelerating Structure	127
	L. Faillace, R.B. Agustsson, P. Frigola, A.Y. Murokh RadiaBeam, Santa Monica, USA V.A. Dolgashev SLAC, Menlo Park, California, USA J.B. Rosenzweig UCLA, Los Angeles, California, USA V. Yakimenko BNL, Upton, Long Island, New York, USA
	Funding: Dept. of Energy DE-SC0000866 In this paper, we present the radio-frequency design of the DECA (Doubled Energy Compact Accelerator) S-band accelerating structure operating in the pi-mode at 2.856 GHz, where RF power sources are commonly available. The development of the DECA structure will offer an ultra-compact drop-in replacement for a conventional S-band linac in research and industrial applications such as drivers for compact light sources, medical and security systems. The electromagnetic design has been performed with the codes SuperFish and HFSS. The choice of the single cell shape derives from an optimization process aiming to maximize RF efficiency and minimize surface fields at very high accelerating gradients, i.e. 50 MV/m and above. Such gradients can be achieved utilizing shape-optimized elliptical irises, dual-feed couplers with the "fat-lip" coupling slot geometry, and specialized fabrication procedures developed for high gradient structures. The thermal-stress analysis of the DECA structure is also presented. * V. Dolgashev, "Status of X-band Standing Wave Structure Studies at SLAC", SLAC-PUB-10124, (2003). ** C. Limborg et al., "RF Design of LCLS Gun", LCLS-TN-05-03 (2005).

MOP057	A SLAB Dielectric Structure as a Source of Wakefield Acceleration and THz Cherenkov Radiation Generation	211
	D. Stratakis, G. Andonian, J.B. Rosenzweig, X. Wei UCLA, Los Angeles, USA
	Funding: Work is funded by US Dept. of Energy grant numbers DE-FG03-92ER40693. Acceleration of electrons in wakefields set up by a series of drive bunches in a dielectric structure has been proposed as a possible component of next-generation accelerators. Here, we discuss future experimental work with a slab sub-millimeter dielectric loaded accelerator structure that in contrast to conventional dielectric tubes should diminish the effects of transverse wakes and will permit higher total charge to be accelerated. The proposed experiment will allow the generation of unprecedented peak power at THz frequencies. In addition, it can generate ~50-150 MV/m drive fields and thus will allow the testing of acceleration using witness and drive beams. We examine details of the geometry and composition of the structures to be used in the experiment.

WEODS4	High Gradient Normal Conducting Radio-Frequency Photoinjector System for Sincrotrone Trieste	1504
	L. Faillace, R.B. Agustsson, P. Frigola RadiaBeam, Santa Monica, USA H. Badakov, A. Fukasawa, J.B. Rosenzweig, A. Yakub UCLA, Los Angeles, USA F. Cianciosi, P. Craievich, M. Trovò ELETTRA, Basovizza, Italy L. Palumbo Rome University La Sapienza, Roma, Italy B. Spataro INFN/LNF, Frascati (Roma), Italy
	Radiabeam Technologies is leading a multi-organizational collaboration by UCLA, INFN and MATS to deliver a high gradient normal conducting radio frequency (NCRF) 1.6 cell photoinjector system to the Sincrotrone Trieste facility. Designed to operate with a 120MV/m accelerating gradient, this dual feed, fat lipped racetrack coupler design is modeled after the LCLS photoinjector with a novel demountable cathode which permits cost effective cathode exchange. Full overview of the project to date will be discussed along with basic, design, engineering, manufacturing and RF test results.
	Slides WEODS4 [3.186 MB]

THP050	Normal Conducting Radio Frequency X-band Deflecting Cavity Fabrication and Validation	2211
	R.B. Agustsson, S. Boucher, L. Faillace, P. Frigola, A.Y. Murokh, S. Storms RadiaBeam, Santa Monica, USA D. Alesini INFN/LNF, Frascati (Roma), Italy V.A. Dolgashev, R.J. England SLAC, Menlo Park, California, USA J.B. Rosenzweig UCLA, Los Angeles, California, USA V. Yakimenko BNL, Upton, Long Island, New York, USA
	An X-band Traveling wave Deflector mode cavity (XTD) has been developed at Radiabeam Technologies to perform longitudinal characterization of the sub-picosecond ultra-relativistic electron beams. The device is optimized for the 100 MeV electron beam parameters at the Accelerator Test Facility (ATF) at Brookhaven National Laboratory, and is scalable to higher energies. The XTD is designed to operate at 11.424 GHz, and features short filling time, femtosecond resolution, and a small footprint. RF design, fabrication and RF validation and tuning will be presented.

THP164	Orbital Angular Momentum Light Generated via FEL at NLCTA	2420
	A. Knyazik, E. Hemsing, A. Marinelli, J.B. Rosenzweig UCLA, Los Angeles, California, USA
	A scheme to create coherent light with orbital angular momentum (OAM) using Free Electron Laser (FEL) at NLCTA is proposed. An 795 nm light co-propagating with relativistic unmodulated electron beam is fed through a helical undulator tuned to the second harmonic of the laser, which acts as a pre-buncher that helically micro-bunches the beam, modulating it in energy. The energy modulation is transferred to helical density modulation by propagating through a longitudinally dispersive section, such as a chicane. Finally the helical density 3-D modulated electron beam is sent through a second undulator resonant at light’s fundamental frequency, causing the electron beam to radiate OAM light. NLCTA facility has everything to make this experiment, including a planar undulator tuned to the fundamental frequency, except for a helical pre-bunching undulator, which can be easily constructed and installed to generate OAM light at NLCTA. According to simulations generated with Mathematica 7 and Genesis 1.3 a 3 period long pre-buncher will be enough to get out 140 MW of laser power from a seeded 10 MW, after transversing a 1.5 m long planar radiator using electron beam generated by NLCTA.

TUODS4	Free Electron Laser Seeding Experiments at SPARC
	L. Giannessi, F. Ciocci, G. Dattoli, M. Del Franco, A. Petralia, M. Quattromini, C. Ronsivalle, I.P. Spassovsky, V. Surrenti ENEA C.R. Frascati, Frascati (Roma), Italy D. Alesini, M. Bellaveglia, M. Castellano, E. Chiadroni, G. Di Pirro, M. Ferrario, D. Filippetto, A. Gallo, G. Gatti, A. Ghigo, E. Pace, B. Spataro, C. Vaccarezza INFN/LNF, Frascati (Roma), Italy A. Bacci, A.R. Rossi, L. Serafini Istituto Nazionale di Fisica Nucleare, Milano, Italy M. Bougeard, B. Carré, D. Garzella CEA/DSM/DRECAM/SPAM, Gif-sur-Yvette, France F. Briquez, M.-E. Couprie, M. Labat SOLEIL, Gif-sur-Yvette, France A. Cianchi Università di Roma II Tor Vergata, Roma, Italy F. Frassetto, L. P. Poletto LUXOR, Padova, Italy G. Lambert LOA, Palaiseau, France G. Marcus, P. Musumeci, J.B. Rosenzweig UCLA, Los Angeles, California, USA M. Migliorati, A. Mostacci, L. Palumbo Rome University La Sapienza, Roma, Italy M. Moreno, M. Serluca INFN-Roma, Roma, Italy V. Petrillo Universita' degli Studi di Milano, Milano, Italy J.V. Rau, V. Rossi Albertini ISM-CNR, Rome, Italy E. Sabia ENEA Portici, Portici (Napoli), Italy S. Spampinati ELETTRA, Basovizza, Italy
	We report on the recent activity at SPARC, which has successfully been operated in seeded mode. In the framework of the DS4 EUROFEL collaboration, a research work plan aiming at the investigation of seeded and cascaded FEL configurations was implemented. The main goal of the collaboration was to study the amplification and the harmonic generation process of an input seed signal. We describe here the first experimental results, with the observation of harmonics up to the 11th of the fundamental and the operation of the FEL in cascaded mode, driven both by seed generated in crystal and in gas (Ar).
	Slides TUODS4 [8.947 MB]