PAC2013 - List of Authors (Agustsson, R.B.)

Paper

Title

Page

Continued Development and Testing of Carbon Nanotube Cathodes at Radiabeam

394

J.J. Hartzell, R.B. Agustsson, S. Boucher, L. Faillace, A.Y. Murokh, A.V. Smirnov
RadiaBeam, Santa Monica, USA
W.A. Hubbard, C. Regan
UCLA, Los Angeles, USA

Funding: US Department of Energy
RadiaBeam Technologies is developing carbon nanotube (CNT) based field emission cathodes for DC-pulsed and radio-frequency electron sources. CNT cathodes offer simple operation, have demonstrated high current densities, and can maintain low thermal emittance due to their ability to emit at room temperature. The experimental results of high-voltage and lifetime testing of CNT cathodes are presented. There is also a brief summary of a planned experiment in a dual-frequency RF gun. Additionally, some of the challenges posed by the fabrication and handling of the CNT cathodes are discussed.

Slides TUOAB2 [10.433 MB]

TUPSM27

High-power Tests and Initial Electron Beam Measurements of the New High-gradient Normal Conducting RF Photoinjector System for the Sincrotrone Trieste

694

L. Faillace, R.B. Agustsson, H. Badakov, P. Frigola, A. Verma
RadiaBeam, Santa Monica, USA
F. Cianciosi, P. Craievich, M. Trovò
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
A. Fukasawa, J.B. Rosenzweig, A. Yakub
UCLA, Los Angeles, USA

Radiabeam Technologies, in collaboration with UCLA, presents the development of a high gradient normal conducting radio frequency (NCRF) 1.6 cell photoinjector system, termed the Fermi Gun II, for the Sincrotrone Trieste (ST) facility. Designed to operate with a 120MV/m accelerating gradient, this single 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, installation, high-power RF conditioning and initial electron beam emittance measurements at Sincrotrone Trieste will be discussed along with basic design, engineering and manufacturing.

WEOCA2

Inductively Coupled Pulsed Energy Extraction System for 2G Wire-based Magnets

725

R.B. Agustsson, J.J. Hartzell, S. Storms
RadiaBeam, Santa Monica, USA

This project seeks to develop a novel method for quench protection of high-temperature superconducting (HTS) magnets based on coupling the magnet with a high-power resonant coil. The quench protection is realized by applying an electromagnetic pulse through the resonant coil and disrupting the superconducting state in the conductor. This creates a large (10s of meters) normal zone in less than 10 ms thus ensuring even distribution of the energy dissipation. The proposed protection system does not involve generation of high voltage on the coil leads and does not contribute to cryogenic losses. The system is easily scaled to a magnet of arbitrary size. Preliminary design and POC bench top test results are presented below.

Slides WEOCA2 [8.239 MB]

WEPBA17

Measurement of Non-Linear Insert Magnets

922

F.H. O'Shea, R.B. Agustsson, A.Y. Murokh, E. Spranza
RadiaBeam, Marina del Rey, USA
S. Nagaitsev, A. Valishev
Fermilab, Batavia, USA

Fermilab's Integrable Optics Test Accelerator (IOTA) is an electron storage ring designed for testing advanced accelerator physics concepts, including implementation of nonlinear integrable beam optics and experiments on optical stochastic cooling. In this report we describe the contribution of RadiaBeam Technologies to the IOTA project which includes nonlinear magnet engineering, production and measurement.

WEPBA18

Performance of Planar Radiator in the Radiabeam-IAC Experiment

925

A.V. Smirnov, R.B. Agustsson, S. Boucher, J.J. Hartzell, S. Storms
RadiaBeam, Santa Monica, USA
Y. Kim
IAC, Pocatello, IDAHO, USA

Funding: Work supported by the U.S. Department of Energy (award No. DE- SC-FOA-0000760 and in part DE-FG02-07ER84877)
Planar gratings structure for generation of mm-sub-mm wavelength long-range wakefields is analyzed. The rugged, side-open, slow wave structure can sustain substantial beam loading including long multi-bunch trains up to CW operation. Electromagnetic performance of the structure is characterized numerically vs. experiment with emphasis to application to flat beams. It is shown that such an electrically wide, wavelength-gap structure can operate at significantly reduced tolerances whereas substantial flatness of the wakefield can be obtained at essentially non-flat eigenmode profile.

THOAA2

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

S. Boucher, R.B. Agustsson, L. Faillace, J.J. Hartzell, A.Y. Murokh, S. Seung, 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.

Slides THOAA2 [6.067 MB]

THPAC29

Fabrication and Validation of a Normal Conducting Radio Frequency S-Band Deflecting Cavity for the Pohang Accelerator Laboratory (PAL)

1202

L. Faillace, R.B. Agustsson, J.J. Hartzell, A.Y. Murokh, S. Storms
RadiaBeam, Santa Monica, USA

Radiabeam Technologies recently developed an S-Band normal-conducting radio-Frequency (NCRF) deflecting cavity for the Pohang Accelerator Laboratory (PAL) in order to perform longitudinal characterization of the sub-picosecond ultra-relativistic electron beams. The device is optimized for the 135 MeV electron beam parameters. The 1m-long PAL deflector is designed to operate at 2.856 GHz and features short filling time and femtosecond resolution. RF design, fabrication, RF validation and tuning will be presented, as well as initial beam measurements.

THPAC32

Transverse Beam Profile Diagnostic Using Fiber Optic Array

1205

S. Wu, R.B. Agustsson, G. Andonian, T.J. Campese, A.Y. Murokh
RadiaBeam, Santa Monica, USA
M.G. Fedurin, K. Kusche, R. Malone, C. Swinson
BNL, Upton, Long Island, New York, USA
R.K. Li
UCLA, Los Angeles, California, USA

Funding: This work is supported by U.S. D.O.E Contract Number DE-SC0000870
The fiber-mesh diagnostic (FMD) is a transverse beam profile diagnostic based on the emission and detection of Cherenkov radiation produced as a relativistic electron beam traverses through an ordered bundle of fiber optics (SiO2), arranged in a hexagonal close-pack configuration. Sub-10μm transverse beam profile resolution is attainable due to fiber optic core concentricity. Adequate SNR is achieved using a standard CCD sensor. A fiber optic taper input maximizes light collection efficiency by coupling each output channel to approximately single-pixel pitch. A v-groove holder and assembly process was developed to hold many fiber layers in the desired configuration. In this paper, we present results from a fully functional FMD prototype evaluated at the BNL ATF facility that demonstrates the efficacy of this diagnostic.

THPAC36

Progress in the Development of Textured Dysprosium for Undulator Applications

1217

F.H. O'Shea
UCLA, Los Angeles, California, USA
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

RadiaBeam Technologies is in the process of developing bulk textured dysprosium as a potential replacement for CoFe steel as undulator poles. For cryogenic undulators that can be cooled below the ferromagnetic transition of dysprosium, textured dysprosium offers potential increase in the peak field of the undulator. Here we report on the progress of the project, including magnetization curves for the material and simulations of a short period undulator utilizing the material.

Paper	Title	Page
TUOAB2	Continued Development and Testing of Carbon Nanotube Cathodes at Radiabeam	394
	J.J. Hartzell, R.B. Agustsson, S. Boucher, L. Faillace, A.Y. Murokh, A.V. Smirnov RadiaBeam, Santa Monica, USA W.A. Hubbard, C. Regan UCLA, Los Angeles, USA
	Funding: US Department of Energy RadiaBeam Technologies is developing carbon nanotube (CNT) based field emission cathodes for DC-pulsed and radio-frequency electron sources. CNT cathodes offer simple operation, have demonstrated high current densities, and can maintain low thermal emittance due to their ability to emit at room temperature. The experimental results of high-voltage and lifetime testing of CNT cathodes are presented. There is also a brief summary of a planned experiment in a dual-frequency RF gun. Additionally, some of the challenges posed by the fabrication and handling of the CNT cathodes are discussed.
	Slides TUOAB2 [10.433 MB]

TUPSM27	High-power Tests and Initial Electron Beam Measurements of the New High-gradient Normal Conducting RF Photoinjector System for the Sincrotrone Trieste	694
	L. Faillace, R.B. Agustsson, H. Badakov, P. Frigola, A. Verma RadiaBeam, Santa Monica, USA F. Cianciosi, P. Craievich, M. Trovò Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy A. Fukasawa, J.B. Rosenzweig, A. Yakub UCLA, Los Angeles, USA
	Radiabeam Technologies, in collaboration with UCLA, presents the development of a high gradient normal conducting radio frequency (NCRF) 1.6 cell photoinjector system, termed the Fermi Gun II, for the Sincrotrone Trieste (ST) facility. Designed to operate with a 120MV/m accelerating gradient, this single 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, installation, high-power RF conditioning and initial electron beam emittance measurements at Sincrotrone Trieste will be discussed along with basic design, engineering and manufacturing.

WEOCA2	Inductively Coupled Pulsed Energy Extraction System for 2G Wire-based Magnets	725
	R.B. Agustsson, J.J. Hartzell, S. Storms RadiaBeam, Santa Monica, USA
	This project seeks to develop a novel method for quench protection of high-temperature superconducting (HTS) magnets based on coupling the magnet with a high-power resonant coil. The quench protection is realized by applying an electromagnetic pulse through the resonant coil and disrupting the superconducting state in the conductor. This creates a large (10s of meters) normal zone in less than 10 ms thus ensuring even distribution of the energy dissipation. The proposed protection system does not involve generation of high voltage on the coil leads and does not contribute to cryogenic losses. The system is easily scaled to a magnet of arbitrary size. Preliminary design and POC bench top test results are presented below.
	Slides WEOCA2 [8.239 MB]

WEPBA17	Measurement of Non-Linear Insert Magnets	922
	F.H. O'Shea, R.B. Agustsson, A.Y. Murokh, E. Spranza RadiaBeam, Marina del Rey, USA S. Nagaitsev, A. Valishev Fermilab, Batavia, USA
	Fermilab's Integrable Optics Test Accelerator (IOTA) is an electron storage ring designed for testing advanced accelerator physics concepts, including implementation of nonlinear integrable beam optics and experiments on optical stochastic cooling. In this report we describe the contribution of RadiaBeam Technologies to the IOTA project which includes nonlinear magnet engineering, production and measurement.

WEPBA18	Performance of Planar Radiator in the Radiabeam-IAC Experiment	925
	A.V. Smirnov, R.B. Agustsson, S. Boucher, J.J. Hartzell, S. Storms RadiaBeam, Santa Monica, USA Y. Kim IAC, Pocatello, IDAHO, USA
	Funding: Work supported by the U.S. Department of Energy (award No. DE- SC-FOA-0000760 and in part DE-FG02-07ER84877) Planar gratings structure for generation of mm-sub-mm wavelength long-range wakefields is analyzed. The rugged, side-open, slow wave structure can sustain substantial beam loading including long multi-bunch trains up to CW operation. Electromagnetic performance of the structure is characterized numerically vs. experiment with emphasis to application to flat beams. It is shown that such an electrically wide, wavelength-gap structure can operate at significantly reduced tolerances whereas substantial flatness of the wakefield can be obtained at essentially non-flat eigenmode profile.

THOAA2	Compact, Inexpensive X-band Linacs as Radioactive Isotope Source Replacements
	S. Boucher, R.B. Agustsson, L. Faillace, J.J. Hartzell, A.Y. Murokh, S. Seung, 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.
	Slides THOAA2 [6.067 MB]

THPAC29	Fabrication and Validation of a Normal Conducting Radio Frequency S-Band Deflecting Cavity for the Pohang Accelerator Laboratory (PAL)	1202
	L. Faillace, R.B. Agustsson, J.J. Hartzell, A.Y. Murokh, S. Storms RadiaBeam, Santa Monica, USA
	Radiabeam Technologies recently developed an S-Band normal-conducting radio-Frequency (NCRF) deflecting cavity for the Pohang Accelerator Laboratory (PAL) in order to perform longitudinal characterization of the sub-picosecond ultra-relativistic electron beams. The device is optimized for the 135 MeV electron beam parameters. The 1m-long PAL deflector is designed to operate at 2.856 GHz and features short filling time and femtosecond resolution. RF design, fabrication, RF validation and tuning will be presented, as well as initial beam measurements.

THPAC32	Transverse Beam Profile Diagnostic Using Fiber Optic Array	1205
	S. Wu, R.B. Agustsson, G. Andonian, T.J. Campese, A.Y. Murokh RadiaBeam, Santa Monica, USA M.G. Fedurin, K. Kusche, R. Malone, C. Swinson BNL, Upton, Long Island, New York, USA R.K. Li UCLA, Los Angeles, California, USA
	Funding: This work is supported by U.S. D.O.E Contract Number DE-SC0000870 The fiber-mesh diagnostic (FMD) is a transverse beam profile diagnostic based on the emission and detection of Cherenkov radiation produced as a relativistic electron beam traverses through an ordered bundle of fiber optics (SiO2), arranged in a hexagonal close-pack configuration. Sub-10μm transverse beam profile resolution is attainable due to fiber optic core concentricity. Adequate SNR is achieved using a standard CCD sensor. A fiber optic taper input maximizes light collection efficiency by coupling each output channel to approximately single-pixel pitch. A v-groove holder and assembly process was developed to hold many fiber layers in the desired configuration. In this paper, we present results from a fully functional FMD prototype evaluated at the BNL ATF facility that demonstrates the efficacy of this diagnostic.

THPAC36	Progress in the Development of Textured Dysprosium for Undulator Applications	1217
	F.H. O'Shea UCLA, Los Angeles, California, USA 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
	RadiaBeam Technologies is in the process of developing bulk textured dysprosium as a potential replacement for CoFe steel as undulator poles. For cryogenic undulators that can be cooled below the ferromagnetic transition of dysprosium, textured dysprosium offers potential increase in the peak field of the undulator. Here we report on the progress of the project, including magnetization curves for the material and simulations of a short period undulator utilizing the material.