2011 Particle Accelerator Conference - List of Authors (Murokh, A.Y.)

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]

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).

MOP239

Commercially Available Transverse Profile Monitors, the IBIS

562

M. Ruelas, R.B. Agustsson, I. Bacchus, A.Y. Murokh, R. Tikhoplav
RadiaBeam, Santa Monica, USA

With ever decreasing budgets, shorter delivery schedules and increased performance requirements for pending and future facilities, the need for cost effective yet high quality profile monitors is paramount to future advancement in the accelerator field. While individual facilities are capable of designing and fabricating these often custom devices, this is not always the most efficient or economical route. In response to the lack of commercially available profile monitors, RadiaBeam Technologies has been developing its line of Integrated Beam Imaging System (IBIS) over the past several years. Here, we report on these commercially available profile monitors.

TUP231

Applications of Textured Dysprosium Concentrators in Ultra-Short Period Insertion Devices

1256

A.Y. Murokh, R.B. Agustsson, P. Frigola
RadiaBeam, Santa Monica, USA
O.V. Chubar, V. Solovyov
BNL, Upton, Long Island, New York, USA

The next generation light sources require development of the insertion devices with shorter periods and higher peak field values, well beyond the presently available designs limited by magnetic properties of conventional materials. Dysprosium (Dy) is a rare earth metal with unique ferromagnetic properties below 90 K, including saturation inductance above 3.4 Tesla. However, due to the high magnetic anisotropy of Dy, such a high level of magnetization can only be realized when the external field lies in the basal plane. This requirement is partially satisfied in the textured dysprosium presently under development at RadiaBeam and BNL. Textured Dy development status is discussed, as well as potential applications as field concentrators in the insertion devices, with particular emphasis on the next generation of cryogenically cooled short period hybrid undulators.

THP002

Re-Circulated Inverse Compton Scattering X-ray Source for Industrial Applications

2139

A.Y. Murokh, R.B. Agustsson, S. Boucher, P. Frigola, T. Hodgetts, A.G. Ovodenko, M. Ruelas, R. Tikhoplav
RadiaBeam, Santa Monica, USA
M. Babzien, O.V. Chubar, T.V. Shaftan, V. Yakimenko
BNL, Upton, Long Island, New York, USA
I. Jovanovic
Penn State University, University Park, Pennsylvania, USA

An experiment is under way at the Accelerator Test Facility (ATF) at BNL to demonstrate inverse Compton scattering in a pulse-train regime. A photoinjector generated electron beam pulse train is scattered by a recirculating laser pulse in a novel resonant configuration termed Recirculation Injection by Nonlinear Gating (RING). The goal of the experiment is to demonstrate strong enhancement of the ICS photon flux through laser recirculation. The project status is presented, and the long-term outlook is discussed with emphasis on the medical and security applications.

THP003

High Power THz FEL Source Based on FFAG Betatron

2142

A.Y. Murokh
RadiaBeam, Santa Monica, USA
S. Reiche
PSI, Villigen, Switzerland

A novel source of high power sub-mm waves is proposed that combines two well-known technologies – a betatron induction FFAG accelerator and a free electron laser (FEL). The system is configured as an FEL oscillator: the electron beam circulates in bi-periodic FFAG lattice and the external optical resonator maintains beam-radiation overlap through multiple orbits. Initial analysis shows that FEL gain and very high extraction efficiency are possible with modest injected beam current. A simplified interaction model and preliminary analysis results are presented.

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.

THP051

An Overview of Normal Conducting Radio Frequency Projects and Manufacturing Capabilities at Radiabeam Technologies, LLC

2214

R.B. Agustsson, S. Boucher, X.D. Ding, L. Faillace, P. Frigola, A.Y. Murokh, S. Storms
RadiaBeam, Santa Monica, USA

Radiabeam Technologies is currently designing, engineering and fabricating 8 different Normal Conducting Radio Frequency (NCRF) accelerating and diagnostic structures. These NCRF programs include compact X-band industrial systems, laboratory grade NCRF photoinjectors, deflecting cavities and High-Gradient structures. Nearly all aspects of these NCRF structures’ lifecycle are performed in house, including design, 3D electromagnetic and thermomechanical modeling, engineering, fabrication, cleaning and RF cold testing, tuning, and RF power testing. An overview of these varied projects along with references to more detailed publications presented in this conference are provided. Details concerning specific processes applicable to all of the above mentioned RF projects are also discussed.

THP224

Progress Report on Development of Novel Ultrafast Mid-IR Laser System

2543

R. Tikhoplav, A.Y. Murokh
RadiaBeam, Santa Monica, USA
I. Jovanovic
Penn State University, University Park, Pennsylvania, USA

Of particular interest to X-ray FEL light source facilities is Enhanced Self-Amplified Spontaneous Emission (ESASE) technique. Such a technique requires an ultrafast (20-50 fs) high peak power, high repetition rate reliable laser systems working in the mid-IR range of spectrum (2μm or more). The approach of this proposed work is to design a novel Ultrafast Mid-IR Laser System based on optical parametric chirped-pulse amplification (OPCPA). OPCPA is a technique ideally suited for production of ultrashort laser pulses at the center wavelength of 2 μm. Some of the key features of OPCPA are the wavelength agility, broad spectral bandwidth and negligible thermal load. This paper reports on the progress of the development of the Ultrafast Mid-IR Laser System.

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]

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).

MOP239	Commercially Available Transverse Profile Monitors, the IBIS	562
	M. Ruelas, R.B. Agustsson, I. Bacchus, A.Y. Murokh, R. Tikhoplav RadiaBeam, Santa Monica, USA
	With ever decreasing budgets, shorter delivery schedules and increased performance requirements for pending and future facilities, the need for cost effective yet high quality profile monitors is paramount to future advancement in the accelerator field. While individual facilities are capable of designing and fabricating these often custom devices, this is not always the most efficient or economical route. In response to the lack of commercially available profile monitors, RadiaBeam Technologies has been developing its line of Integrated Beam Imaging System (IBIS) over the past several years. Here, we report on these commercially available profile monitors.

TUP231	Applications of Textured Dysprosium Concentrators in Ultra-Short Period Insertion Devices	1256
	A.Y. Murokh, R.B. Agustsson, P. Frigola RadiaBeam, Santa Monica, USA O.V. Chubar, V. Solovyov BNL, Upton, Long Island, New York, USA
	The next generation light sources require development of the insertion devices with shorter periods and higher peak field values, well beyond the presently available designs limited by magnetic properties of conventional materials. Dysprosium (Dy) is a rare earth metal with unique ferromagnetic properties below 90 K, including saturation inductance above 3.4 Tesla. However, due to the high magnetic anisotropy of Dy, such a high level of magnetization can only be realized when the external field lies in the basal plane. This requirement is partially satisfied in the textured dysprosium presently under development at RadiaBeam and BNL. Textured Dy development status is discussed, as well as potential applications as field concentrators in the insertion devices, with particular emphasis on the next generation of cryogenically cooled short period hybrid undulators.

THP002	Re-Circulated Inverse Compton Scattering X-ray Source for Industrial Applications	2139
	A.Y. Murokh, R.B. Agustsson, S. Boucher, P. Frigola, T. Hodgetts, A.G. Ovodenko, M. Ruelas, R. Tikhoplav RadiaBeam, Santa Monica, USA M. Babzien, O.V. Chubar, T.V. Shaftan, V. Yakimenko BNL, Upton, Long Island, New York, USA I. Jovanovic Penn State University, University Park, Pennsylvania, USA
	An experiment is under way at the Accelerator Test Facility (ATF) at BNL to demonstrate inverse Compton scattering in a pulse-train regime. A photoinjector generated electron beam pulse train is scattered by a recirculating laser pulse in a novel resonant configuration termed Recirculation Injection by Nonlinear Gating (RING). The goal of the experiment is to demonstrate strong enhancement of the ICS photon flux through laser recirculation. The project status is presented, and the long-term outlook is discussed with emphasis on the medical and security applications.

THP003	High Power THz FEL Source Based on FFAG Betatron	2142
	A.Y. Murokh RadiaBeam, Santa Monica, USA S. Reiche PSI, Villigen, Switzerland
	A novel source of high power sub-mm waves is proposed that combines two well-known technologies – a betatron induction FFAG accelerator and a free electron laser (FEL). The system is configured as an FEL oscillator: the electron beam circulates in bi-periodic FFAG lattice and the external optical resonator maintains beam-radiation overlap through multiple orbits. Initial analysis shows that FEL gain and very high extraction efficiency are possible with modest injected beam current. A simplified interaction model and preliminary analysis results are presented.

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.

THP051	An Overview of Normal Conducting Radio Frequency Projects and Manufacturing Capabilities at Radiabeam Technologies, LLC	2214
	R.B. Agustsson, S. Boucher, X.D. Ding, L. Faillace, P. Frigola, A.Y. Murokh, S. Storms RadiaBeam, Santa Monica, USA
	Radiabeam Technologies is currently designing, engineering and fabricating 8 different Normal Conducting Radio Frequency (NCRF) accelerating and diagnostic structures. These NCRF programs include compact X-band industrial systems, laboratory grade NCRF photoinjectors, deflecting cavities and High-Gradient structures. Nearly all aspects of these NCRF structures’ lifecycle are performed in house, including design, 3D electromagnetic and thermomechanical modeling, engineering, fabrication, cleaning and RF cold testing, tuning, and RF power testing. An overview of these varied projects along with references to more detailed publications presented in this conference are provided. Details concerning specific processes applicable to all of the above mentioned RF projects are also discussed.

THP224	Progress Report on Development of Novel Ultrafast Mid-IR Laser System	2543
	R. Tikhoplav, A.Y. Murokh RadiaBeam, Santa Monica, USA I. Jovanovic Penn State University, University Park, Pennsylvania, USA
	Of particular interest to X-ray FEL light source facilities is Enhanced Self-Amplified Spontaneous Emission (ESASE) technique. Such a technique requires an ultrafast (20-50 fs) high peak power, high repetition rate reliable laser systems working in the mid-IR range of spectrum (2μm or more). The approach of this proposed work is to design a novel Ultrafast Mid-IR Laser System based on optical parametric chirped-pulse amplification (OPCPA). OPCPA is a technique ideally suited for production of ultrashort laser pulses at the center wavelength of 2 μm. Some of the key features of OPCPA are the wavelength agility, broad spectral bandwidth and negligible thermal load. This paper reports on the progress of the development of the Ultrafast Mid-IR Laser System.