IPAC2013 - List of Authors (Murokh, A.Y.)

Paper	Title	Page
MOPWA080	Design of a Fast, XFEL-quality Wire Scanner	867
	M.A. Harrison, R.B. Agustsson, P.S. Chang, T.J. Hodgetts, A.Y. Murokh, M. Ruelas RadiaBeam, Santa Monica, USA
	RadiaBeam Technologies, in collaboration with the Pohang Accelerator Laboratory, has designed and built a fast wire scanner for transverse beam size measurements in the XFEL Injector Test Facility. The wire scanner utilizes three 25-micron diameter tungsten wires mounted vertically, horizontally, and diagonally on a single alumina card to measure the transverse beam size down to 10 microns with sub-micron accuracy of a 139-MeV electron beam. A double-ended design using dual bellows for actuation is used to reduce the vibrations of the wire holder during motion and negate the effects of air pressure on positioning. The servomotor-driven system is capable of performing full horizontal, vertical, and 45-degree scans in under a minute. Algorithms are presented for removing the broadening effect of the wires' thickness from the scanning data to measure beams that are as small or smaller than the wires. Furthermore, we present formulas for determining the beam's transverse spatial sizes (horizontal and vertical spot size and correlation) from the scan data.

WEPWA081	Status of the Praseodymium Undulator with Textured Dysprosium Poles for Compact X-Ray FEL Applications	2298
	F.H. O'Shea, R.B. Agustsson, Y.C. Chen, T.J. Grandsaert, A.Y. Murokh, K.E. Woods RadiaBeam, Santa Monica, USA J. Park, R.L. Stillwell NHMFL, Tallahassee, Florida, USA V. Solovyov BNL, Upton, Long Island, New York, USA
	The demand for high-brightness hard x-ray fluxes from next generation light sources has spurred the development of insertion devices with shorter periods and higher fields than is feasible with conventional materials and designs. RadiaBeam Technologies is currently developing a novel high peak field, ultrashort period undulator with praseodymium-iron-boron (PrFeB) permanent magnets and textured dysprosium (Tx Dy) ferromagnetic field concentrators. This device will offer an unparalleled solution for compact x-ray light sources, as well as for demanding applications at conventional synchrotron radiation sources. A 1.4T on-axis field has already been achieved in a 9mm period undulator, demonstrating the feasibility of using Tx Dy poles in a hybrid undulator configuration with PrFeB magnets. Facets of the undulator design, optimization of the Tx Dy production and characterization process, and magnetic measurements of Tx Dy will be presented.

WEPFI086	Normal Conducting Radio Frequency X-band Deflecting Cavity Fabrication, Validation and Tuning	2899
	R.B. Agustsson, L. Faillace, A.Y. Murokh, E. Spranza, S. Storms RadiaBeam, Santa Monica, USA D. Alesini INFN/LNF, Frascati (Roma), Italy V.A. Dolgashev, J.R. Lewandowski 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, fabricated, tuned and characterized by Radiabeam Technologies to perform longitudinal measurement 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, structure fabrication, cold testing and tuning results are presented.

WEPFI088	High-power Tests of an Ultra-high Gradient Compact S-band (HGS) Accelerating Structure	2902
	L. Faillace, R.B. Agustsson, P. Frigola, A.Y. Murokh, S. Seung RadiaBeam, Santa Monica, USA S.G. Anderson LLNL, Livermore, California, 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
	RadiaBeam Technologies reports on the RF design, fabrication and high-power tests of a ultra-high gradient S-Band accelerating structure (HGS) operating in the pi-mode at 2.856 GHz. The compact HGS structure offers a drop-in replacement for conventional S-Band linacs in research and industrial applications such as drivers for compact light sources, medical and security systems. The electromagnetic design (optimization of the cell shape in order to maximize RF efficiency and minimize surface fields at very high accelerating gradients) has been carried out with the codes HFSS and SuperFish while the thermal analysis has been performed by using the code ANSYS. The high-power conditioning was carried out at Lawrence Livermore National Laboratory (LLNL).

WEPME063	Progress Report on Development of a 5-μm Drive Laser for Dielectric Laser Acceleration	3079
	G. Xu, I. Jovanovic, S.F. Wandel Penn State University, University Park, Pennsylvania, USA E.R. Arab PBPL, Los Angeles, USA P.D. Hoang, P. Musumeci, B.D. O'Shea, J.B. Rosenzweig UCLA, Los Angeles, California, USA A.Y. Murokh, A.G. Ovodenko RadiaBeam, Santa Monica, USA I. Pogorelsky BNL, Upton, Long Island, New York, USA
	Funding: This work has been sponsored by Defense Advanced Research Project Agency. A simple and robust ultrafast, high-peak-power 5-μm laser source for pumping a dielectric photonic structure for high-gradient electron acceleration has been designed and is being constructed. The use of long wavelength drive lasers can mitigate the problem of dielectric structure breakdown caused by multiphoton ionization. In addition, structure fabrication requirements are relaxed, and greater energy can be stored in the structure. The 5-μm laser source consists of two components: (1) a type-II-beta-barium borate-based 2-μm optical parametric amplifier (OPA) as a pump source, and (2) a type-I-zinc-germaniu-phosphate-based 5-μm OPA to produce mJ-class, <100 fs pulses. Our supercontinuum seeded two-stage 2-μm OPA is pumped by a Ti:sapphire amplifier and produces pulse energy of ~1.4 mJ with a pulse duration of 42 fs (~6 optical cycles). Carrier-envelope phase (CEP) stabilization is passively established for 2 μm pulses in our OPA design. An modified design of seed pulse generation for the 5-μm OPA based on several cascaded parametric processes can also result in CEP-stable operation for 5-μm amplified pulses.

THPWA051	Compact, Inexpensive X-band Linacs as Radioactive Isotope Source Replacements	3746
	S. Boucher, R.B. Agustsson, L. Faillace, J.J. Hartzell, A.Y. Murokh, A.V. Smirnov, S. Storms, K.E. Woods RadiaBeam, Santa Monica, USA
	Funding: Work supported by DNDO Phase II SBIR HSHQDC-10-C-00148 and DOE Phase II SBIR DE- SC0000865. Radioisotope sources are commonly used in a variety of industrial and medical applications. The US National Research Council has identified as a priority the replacement of high-activity sources with alternative technologies, due to the risk of accidents and diversion by terrorists for use in Radiological Dispersal Devices (“dirty bombs”). RadiaBeam Technologies is developing novel, compact, inexpensive linear accelerators for use in a variety of such applications as cost-effective replacements. The technology is based on the MicroLinac (originally developed at SLAC), an X-band linear accelerator powered by an inexpensive and commonly available magnetron. Prototypes are currently under construction. This paper will describe the design, engineering, fabrication and testing of these linacs at RadiaBeam. Future development plans will also be discussed.

Paper

Title

Page

Design of a Fast, XFEL-quality Wire Scanner

867

M.A. Harrison, R.B. Agustsson, P.S. Chang, T.J. Hodgetts, A.Y. Murokh, M. Ruelas
RadiaBeam, Santa Monica, USA

RadiaBeam Technologies, in collaboration with the Pohang Accelerator Laboratory, has designed and built a fast wire scanner for transverse beam size measurements in the XFEL Injector Test Facility. The wire scanner utilizes three 25-micron diameter tungsten wires mounted vertically, horizontally, and diagonally on a single alumina card to measure the transverse beam size down to 10 microns with sub-micron accuracy of a 139-MeV electron beam. A double-ended design using dual bellows for actuation is used to reduce the vibrations of the wire holder during motion and negate the effects of air pressure on positioning. The servomotor-driven system is capable of performing full horizontal, vertical, and 45-degree scans in under a minute. Algorithms are presented for removing the broadening effect of the wires' thickness from the scanning data to measure beams that are as small or smaller than the wires. Furthermore, we present formulas for determining the beam's transverse spatial sizes (horizontal and vertical spot size and correlation) from the scan data.

WEPWA081

Status of the Praseodymium Undulator with Textured Dysprosium Poles for Compact X-Ray FEL Applications

2298

F.H. O'Shea, R.B. Agustsson, Y.C. Chen, T.J. Grandsaert, A.Y. Murokh, K.E. Woods
RadiaBeam, Santa Monica, USA
J. Park, R.L. Stillwell
NHMFL, Tallahassee, Florida, USA
V. Solovyov
BNL, Upton, Long Island, New York, USA

The demand for high-brightness hard x-ray fluxes from next generation light sources has spurred the development of insertion devices with shorter periods and higher fields than is feasible with conventional materials and designs. RadiaBeam Technologies is currently developing a novel high peak field, ultrashort period undulator with praseodymium-iron-boron (PrFeB) permanent magnets and textured dysprosium (Tx Dy) ferromagnetic field concentrators. This device will offer an unparalleled solution for compact x-ray light sources, as well as for demanding applications at conventional synchrotron radiation sources. A 1.4T on-axis field has already been achieved in a 9mm period undulator, demonstrating the feasibility of using Tx Dy poles in a hybrid undulator configuration with PrFeB magnets. Facets of the undulator design, optimization of the Tx Dy production and characterization process, and magnetic measurements of Tx Dy will be presented.

WEPFI086

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

2899

R.B. Agustsson, L. Faillace, A.Y. Murokh, E. Spranza, S. Storms
RadiaBeam, Santa Monica, USA
D. Alesini
INFN/LNF, Frascati (Roma), Italy
V.A. Dolgashev, J.R. Lewandowski
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, fabricated, tuned and characterized by Radiabeam Technologies to perform longitudinal measurement 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, structure fabrication, cold testing and tuning results are presented.

WEPFI088

High-power Tests of an Ultra-high Gradient Compact S-band (HGS) Accelerating Structure

2902

L. Faillace, R.B. Agustsson, P. Frigola, A.Y. Murokh, S. Seung
RadiaBeam, Santa Monica, USA
S.G. Anderson
LLNL, Livermore, California, 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

RadiaBeam Technologies reports on the RF design, fabrication and high-power tests of a ultra-high gradient S-Band accelerating structure (HGS) operating in the pi-mode at 2.856 GHz. The compact HGS structure offers a drop-in replacement for conventional S-Band linacs in research and industrial applications such as drivers for compact light sources, medical and security systems. The electromagnetic design (optimization of the cell shape in order to maximize RF efficiency and minimize surface fields at very high accelerating gradients) has been carried out with the codes HFSS and SuperFish while the thermal analysis has been performed by using the code ANSYS. The high-power conditioning was carried out at Lawrence Livermore National Laboratory (LLNL).

WEPME063

Progress Report on Development of a 5-μm Drive Laser for Dielectric Laser Acceleration

3079

G. Xu, I. Jovanovic, S.F. Wandel
Penn State University, University Park, Pennsylvania, USA
E.R. Arab
PBPL, Los Angeles, USA
P.D. Hoang, P. Musumeci, B.D. O'Shea, J.B. Rosenzweig
UCLA, Los Angeles, California, USA
A.Y. Murokh, A.G. Ovodenko
RadiaBeam, Santa Monica, USA
I. Pogorelsky
BNL, Upton, Long Island, New York, USA

Funding: This work has been sponsored by Defense Advanced Research Project Agency.
A simple and robust ultrafast, high-peak-power 5-μm laser source for pumping a dielectric photonic structure for high-gradient electron acceleration has been designed and is being constructed. The use of long wavelength drive lasers can mitigate the problem of dielectric structure breakdown caused by multiphoton ionization. In addition, structure fabrication requirements are relaxed, and greater energy can be stored in the structure. The 5-μm laser source consists of two components: (1) a type-II-beta-barium borate-based 2-μm optical parametric amplifier (OPA) as a pump source, and (2) a type-I-zinc-germaniu-phosphate-based 5-μm OPA to produce mJ-class, <100 fs pulses. Our supercontinuum seeded two-stage 2-μm OPA is pumped by a Ti:sapphire amplifier and produces pulse energy of ~1.4 mJ with a pulse duration of 42 fs (~6 optical cycles). Carrier-envelope phase (CEP) stabilization is passively established for 2 μm pulses in our OPA design. An modified design of seed pulse generation for the 5-μm OPA based on several cascaded parametric processes can also result in CEP-stable operation for 5-μm amplified pulses.

THPWA051

Compact, Inexpensive X-band Linacs as Radioactive Isotope Source Replacements

3746

S. Boucher, R.B. Agustsson, L. Faillace, J.J. Hartzell, A.Y. Murokh, A.V. Smirnov, S. Storms, K.E. Woods
RadiaBeam, Santa Monica, USA

Funding: Work supported by DNDO Phase II SBIR HSHQDC-10-C-00148 and DOE Phase II SBIR DE- SC0000865.
Radioisotope sources are commonly used in a variety of industrial and medical applications. The US National Research Council has identified as a priority the replacement of high-activity sources with alternative technologies, due to the risk of accidents and diversion by terrorists for use in Radiological Dispersal Devices (“dirty bombs”). RadiaBeam Technologies is developing novel, compact, inexpensive linear accelerators for use in a variety of such applications as cost-effective replacements. The technology is based on the MicroLinac (originally developed at SLAC), an X-band linear accelerator powered by an inexpensive and commonly available magnetron. Prototypes are currently under construction. This paper will describe the design, engineering, fabrication and testing of these linacs at RadiaBeam. Future development plans will also be discussed.