IPAC2014 - Classification: 08 Applications of Accelerators / U02 Materials Analysis and Modification

Paper	Title	Page
WEPRO103	Femtosecond Time-resolved Transmission Electron Microscopy using an RF Gun	2205
	J. Yang, M. Gohdo, K. Kan, T. Kondoh, K. Tanimura, Y. Yoshida ISIR, Osaka, Japan J. Urakawa KEK, Ibaraki, Japan
	The first prototype of RF gun based relativistic-energy electron microscopy has been constructed at Osaka University to study ultrafast structural dynamic processes in matter. The RF gun driven by a femtosecond laser has generated a 100-fs-pulse MeV electron beam with emittance of 0.1 mm-mrad and energy spread of 10^-4. Both the electron diffraction and image measurements have been succeeded in the prototype using the femtosecond electron beam. In the diffraction measurement, an excellent quality of diffraction pattern was acquired with electron number of 10⁶. The single-shot measurement is available in the prototype. In the image measurement, the TEM image was acquired with a total electron number of 10⁸. The magnification was 3,000 times. In the next step, we will reduce further the emittance to increase the beam brightness on the sample, and then improve the spatial resolution to <10 nm.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO103
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WEPRO104	Backscattering X-ray System by using 950 keV X-band Linac X-ray Source	2209
SUSPSNE110	use link to see paper's listing under its alternate paper code
	C. Liu The University of Tokyo, Tokyo, Japan T. Fujiwara, M. Uesaka The University of Tokyo, Nuclear Professional School, Ibaraki-ken, Japan J. Kusano Accuthera Inc., Kawasaki, Kanagawa, Japan
	Recently several tunnel collapses have happened in the world. To prevent this kind of accidents, the non-destructive inspection for tunnel is seriously needed. Backscattering X-ray system which makes one-side operation possible is a very important way to solve this problem. But the backscattering X-ray systems using X-ray tubes could only get the superficial information of the concrete target. Now we are using our 950 keV X-ray source to construct the backscattering X-ray system to detect the deeper part of the concrete target. D. Shedlok, T. Edwards, C.Toh, “X-ray Backscatter Imaging for Aerospace Applications”, Review of Progress in Quantitative Nondestructive Evaluation, Volume 30 AIP Conf. Proc. 1335, 509-516, (2011).
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO104
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WEPRO106	Complex “ALFA” After 10 Years of Operation on Track Membranes Production	2212
	G.A. Karamysheva, Yu.N. Denisov JINR, Dubna, Moscow Region, Russia
	The film irradiation complex “ALFA” dedicated to expose the polymer films used in the track membranes production was designed and manufactured by Joint Institute for Nuclear Research for “TRACKPORE TECHNOLOGY" holding company and put into operation in 2002 year in Dubna, Russia. The complex consists of the isochronous cyclotron CYTRACK with external injection of ions, the extraction system, the beam transport of accelerated ions and the film irradiation chamber. Cyclotron CYTRACK accelerates argon ions upto the energy - 2,4 МeV/nucleon, intensity of extracted beam is about 500nA, extraction efficiency totaled 50%. The complex “ALFA” products polyethylene terephthalate track membranes with less than 25 μm thickness and less than 40cm width. After ten years of the successful operation complex “ALFA” was upgraded. Vacuum, control and power supply systems were replaced. As a result the stability and efficiency of the operation of the equipment were increased.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO106
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WEPRO107	Positron Annihilation Spectroscopy at the LEPTA Facility	2215
	P. Horodek JINR/DLNP, Dubna, Moscow region, Russia A.G. Kobets, I.N. Meshkov, O. Orlov, A.A. Sidorin JINR, Dubna, Moscow Region, Russia
	Since 2009 year the LEPTA facility at Joint Institute for Nuclear Research in Dubna is operated with positron beam. Today it is developed into two directions. The first one is getting orthopositronium flux in flight. Slow positrons from 22Na source are accumulated in Surko trap and then are injected into the ring where they should overlap with electrons from the single-pass electron beam. In this way the flux of orthopositronium atoms will appear and will be observed in the process of registration of gamma quanta from annihilation process. The second group of works focuses on using the positron injector for Positron Annihilation Spectroscopy (PAS) applications. This method is dedicated to detection of structural defects as vacancies in the solid body lattice. The latest progress of this technique is strictly connected with measurements of PAS characteristics using positron beams. The progress in the LEPTA development, the first results obtained in the PAS, idea and actual state of works concerning the construction of the pulsed positron beam will be presented. The creation of pulsed positron beams is the modern tendency in the PAS domain.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO107
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WEPRO108	Electron Diffraction on VELA at Daresbury	2218
	M. Surman STFC/DL/SRD, Warrington, Cheshire, United Kingdom P. Aden, R.J. Cash, D.M.P. Holland, M.D. Roper STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom W.A. Bryan Swansea University, Swansea, Wales J.A. Clarke, J.W. McKenzie STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom P.D. Lane, D.A. Wann University of York, York, United Kingdom J.G. Underwood UCL, London, United Kingdom
	Accelerator based Ultrafast Electron Diffraction (UED) is a technique for static and dynamic structural studies in material and biological sciences. The recently commissioned VELA accelerator at the Daresbury Laboratory provides multi-MeV beams for science and industry and will provide a test bed for the UK electron diffraction community. We present the design of the diffractometer currently being installed on VELA which will allow capture of a single shot diffraction pattern with a 1 pC electron bunch and outline future options.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO108
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THOAB03	A High Resolution Spatial-temporal Imaging Diagnostic for High Energy Density Physics Experiments	2819
	W. Gai ANL, Argonne, Illinois, USA S. Cao, H.S. Xu, W.-L. Zhan, Z.M. Zhang, Y.T. Zhao IMP, Lanzhou, People's Republic of China J.Q. Qiu Euclid TechLabs, LLC, Solon, Ohio, USA C.-X. Tang TUB, Beijing, People's Republic of China
	We present a scheme that uses a high energy electron beam as a probe for time resolved (~ pico – nano seconds) imaging measurements of high energy density processes in materials with spatial resolution of < 1 μm. The device uses an electron bunch train with a flexible time structure penetrating a time varying high density target. By imaging the scattered electron beam, the detailed target profile and its density evolution can be accurately determined. In this paper, we discuss the viability of the concept and show that for densities in the range up to 400 gram/cm³, an electron beam consisting of a train of ~800 MeV bunchlets, each a few ps long and with charges ~nC is suitable. Successful demonstration of this concept will have a major impact for both future fusion science and HEDP physics research.
	Slides THOAB03 [2.493 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THOAB03
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FRXBA01	Imaging Systems for 800 MeV Proton Radiography	4057
	F.E. Merrill, D.B. Barlow, C.J. Espinoza, B.J. Hollander, K. Kwiatkowki, J.D. Lopez, F.G. Mariam, D.J. Morley, C.L. Morris, P. Nedrow, A. Saunders, A. Tainter, D. Tupa, J. Tybo LANL, Los Alamos, New Mexico, USA
	Los Alamos National Laboratory has developed the technique of proton radiography as a flash radiography system for the study of dynamic systems. Historically these studies have focused on measuring fundamental material properties of dynamic materials (equation of state, strength, phase transitions) as well as the physical processes important in predicting the hydrodynamic flow of these materials at high velocity pressure and density (instabilities such as Richtmyer-Meshkov, Rayleigh-Taylor and Kelvin-Helmholtz). Recently these techniques have been extended to new applications which benefit from the unique capabilities of 800 MeV proton radiography. These new applications range from the study of metal alloy solidification to medical imaging applications. In addition to extending the application of this capability performance improvements have been investigated for future implementation. The results of dynamic studies and new applications are presented along with a proposed plan for future radiographic improvements.
	Slides FRXBA01 [8.667 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-FRXBA01
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Femtosecond Time-resolved Transmission Electron Microscopy using an RF Gun

2205

J. Yang, M. Gohdo, K. Kan, T. Kondoh, K. Tanimura, Y. Yoshida
ISIR, Osaka, Japan
J. Urakawa
KEK, Ibaraki, Japan

The first prototype of RF gun based relativistic-energy electron microscopy has been constructed at Osaka University to study ultrafast structural dynamic processes in matter. The RF gun driven by a femtosecond laser has generated a 100-fs-pulse MeV electron beam with emittance of 0.1 mm-mrad and energy spread of 10^-4. Both the electron diffraction and image measurements have been succeeded in the prototype using the femtosecond electron beam. In the diffraction measurement, an excellent quality of diffraction pattern was acquired with electron number of 10⁶. The single-shot measurement is available in the prototype. In the image measurement, the TEM image was acquired with a total electron number of 10⁸. The magnification was 3,000 times. In the next step, we will reduce further the emittance to increase the beam brightness on the sample, and then improve the spatial resolution to <10 nm.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO103

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPRO104

Backscattering X-ray System by using 950 keV X-band Linac X-ray Source

2209

SUSPSNE110

use link to see paper's listing under its alternate paper code

C. Liu
The University of Tokyo, Tokyo, Japan
T. Fujiwara, M. Uesaka
The University of Tokyo, Nuclear Professional School, Ibaraki-ken, Japan
J. Kusano
Accuthera Inc., Kawasaki, Kanagawa, Japan

Recently several tunnel collapses have happened in the world. To prevent this kind of accidents, the non-destructive inspection for tunnel is seriously needed. Backscattering X-ray system which makes one-side operation possible is a very important way to solve this problem. But the backscattering X-ray systems using X-ray tubes could only get the superficial information of the concrete target*. Now we are using our 950 keV X-ray source to construct the backscattering X-ray system to detect the deeper part of the concrete target.
*D. Shedlok, T. Edwards, C.Toh, “X-ray Backscatter Imaging for Aerospace Applications”, Review of Progress in Quantitative Nondestructive Evaluation, Volume 30 AIP Conf. Proc. 1335, 509-516, (2011).

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO104

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPRO106

Complex “ALFA” After 10 Years of Operation on Track Membranes Production

2212

G.A. Karamysheva, Yu.N. Denisov
JINR, Dubna, Moscow Region, Russia

The film irradiation complex “ALFA” dedicated to expose the polymer films used in the track membranes production was designed and manufactured by Joint Institute for Nuclear Research for “TRACKPORE TECHNOLOGY" holding company and put into operation in 2002 year in Dubna, Russia. The complex consists of the isochronous cyclotron CYTRACK with external injection of ions, the extraction system, the beam transport of accelerated ions and the film irradiation chamber. Cyclotron CYTRACK accelerates argon ions upto the energy - 2,4 МeV/nucleon, intensity of extracted beam is about 500nA, extraction efficiency totaled 50%. The complex “ALFA” products polyethylene terephthalate track membranes with less than 25 μm thickness and less than 40cm width. After ten years of the successful operation complex “ALFA” was upgraded. Vacuum, control and power supply systems were replaced. As a result the stability and efficiency of the operation of the equipment were increased.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO106

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPRO107

Positron Annihilation Spectroscopy at the LEPTA Facility

2215

P. Horodek
JINR/DLNP, Dubna, Moscow region, Russia
A.G. Kobets, I.N. Meshkov, O. Orlov, A.A. Sidorin
JINR, Dubna, Moscow Region, Russia

Since 2009 year the LEPTA facility at Joint Institute for Nuclear Research in Dubna is operated with positron beam. Today it is developed into two directions. The first one is getting orthopositronium flux in flight. Slow positrons from 22Na source are accumulated in Surko trap and then are injected into the ring where they should overlap with electrons from the single-pass electron beam. In this way the flux of orthopositronium atoms will appear and will be observed in the process of registration of gamma quanta from annihilation process. The second group of works focuses on using the positron injector for Positron Annihilation Spectroscopy (PAS) applications. This method is dedicated to detection of structural defects as vacancies in the solid body lattice. The latest progress of this technique is strictly connected with measurements of PAS characteristics using positron beams. The progress in the LEPTA development, the first results obtained in the PAS, idea and actual state of works concerning the construction of the pulsed positron beam will be presented. The creation of pulsed positron beams is the modern tendency in the PAS domain.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO107

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPRO108

Electron Diffraction on VELA at Daresbury

2218

M. Surman
STFC/DL/SRD, Warrington, Cheshire, United Kingdom
P. Aden, R.J. Cash, D.M.P. Holland, M.D. Roper
STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
W.A. Bryan
Swansea University, Swansea, Wales
J.A. Clarke, J.W. McKenzie
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
P.D. Lane, D.A. Wann
University of York, York, United Kingdom
J.G. Underwood
UCL, London, United Kingdom

Accelerator based Ultrafast Electron Diffraction (UED) is a technique for static and dynamic structural studies in material and biological sciences. The recently commissioned VELA accelerator at the Daresbury Laboratory provides multi-MeV beams for science and industry and will provide a test bed for the UK electron diffraction community. We present the design of the diffractometer currently being installed on VELA which will allow capture of a single shot diffraction pattern with a 1 pC electron bunch and outline future options.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO108

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THOAB03

A High Resolution Spatial-temporal Imaging Diagnostic for High Energy Density Physics Experiments

2819

W. Gai
ANL, Argonne, Illinois, USA
S. Cao, H.S. Xu, W.-L. Zhan, Z.M. Zhang, Y.T. Zhao
IMP, Lanzhou, People's Republic of China
J.Q. Qiu
Euclid TechLabs, LLC, Solon, Ohio, USA
C.-X. Tang
TUB, Beijing, People's Republic of China

We present a scheme that uses a high energy electron beam as a probe for time resolved (~ pico – nano seconds) imaging measurements of high energy density processes in materials with spatial resolution of < 1 μm. The device uses an electron bunch train with a flexible time structure penetrating a time varying high density target. By imaging the scattered electron beam, the detailed target profile and its density evolution can be accurately determined. In this paper, we discuss the viability of the concept and show that for densities in the range up to 400 gram/cm³, an electron beam consisting of a train of ~800 MeV bunchlets, each a few ps long and with charges ~nC is suitable. Successful demonstration of this concept will have a major impact for both future fusion science and HEDP physics research.

Slides THOAB03 [2.493 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THOAB03

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FRXBA01

Imaging Systems for 800 MeV Proton Radiography

4057

F.E. Merrill, D.B. Barlow, C.J. Espinoza, B.J. Hollander, K. Kwiatkowki, J.D. Lopez, F.G. Mariam, D.J. Morley, C.L. Morris, P. Nedrow, A. Saunders, A. Tainter, D. Tupa, J. Tybo
LANL, Los Alamos, New Mexico, USA

Los Alamos National Laboratory has developed the technique of proton radiography as a flash radiography system for the study of dynamic systems. Historically these studies have focused on measuring fundamental material properties of dynamic materials (equation of state, strength, phase transitions) as well as the physical processes important in predicting the hydrodynamic flow of these materials at high velocity pressure and density (instabilities such as Richtmyer-Meshkov, Rayleigh-Taylor and Kelvin-Helmholtz). Recently these techniques have been extended to new applications which benefit from the unique capabilities of 800 MeV proton radiography. These new applications range from the study of metal alloy solidification to medical imaging applications. In addition to extending the application of this capability performance improvements have been investigated for future implementation. The results of dynamic studies and new applications are presented along with a proposed plan for future radiographic improvements.

Slides FRXBA01 [8.667 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-FRXBA01

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)