PAC2013 - List of Authors (Hartzell, J.J.)

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]

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]

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.

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]

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]

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.