IPAC2016 - List of Authors (Savin, E.A.)

Paper	Title	Page
MOPMR056	Single-shot THz Spectrometer for Measurement of RF Breakdown in mm-wave Accelerators	374
	S.V. Kutsaev, A.Y. Murokh, M. Ruelas, E.A. Savin, H.L. To RadiaBeam Systems, Santa Monica, California, USA M. Dal Forno, V.A. Dolgashev SLAC, Menlo Park, California, USA V. Goncharik Logicware Inc, New York, USA E.A. Savin MEPhI, Moscow, Russia
	Funding: This work was supported by the U.S. Department of Energy, Office of High Energy Physics, under contract DE-SC0013684 We present a new instrument designed to detect RF pulse shortening caused by vacuum RF breakdown in mm-wave particle accelerators. RF breakdown limits the performance of high gradient RF accelerators. To understand the properties of these breakdowns, it is necessary to have diagnostics that reliably detect RF breakdowns. In X-band or S-band accelerators, RF breakdowns are detected by measuring RF pulse shortening, vacuum burst, or, if current monitors are available, spikes in the field-emitted currents. In mm-wave accelerators, all of these methods are difficult to use. In our experiments, we could not measure RF pulse shortening directly with a crystal detector because the RF pulse is very short'just a few nanoseconds'and changes in the measured signal were masked by RF amplitude jitter. To overcome this limitation, we built a single-shot spectrometer with a frequency range of 117-125 GHz and a resolution of 0.1 GHz. The spectrometer should be able to measure the widening of the spectrum caused by the shortening of nanosecond-long pulses. We present design considerations, first experimental results obtained at FACET, and planned future improvements for the spectrometer.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMR056
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TUPOW022	Hybrid Electron Linac With Standing and Travelling Wave Accelerating Sections	1791
	S.V. Matsievskiy, A.V. Bulanov, V.I. Kaminskiy, E.A. Savin, N.P. Sobenin MEPhI, Moscow, Russia R.Yu. Alekhanov NRNU, Moscow, Russia
	Hybrid electron linacs with standing and travelling wave accelerating sections are not well described in literature. Limited number of studies have shown that application of these systems makes it possible to develop a compact linac with high efficiency and simpler power system. Typically, these systems use well-studied bi-periodical accelerating structure (BAS) cells for a standing wave section and disc-loaded waveguides (DLW) for a traveling wave section. This paper describes the development of such system using DLW cells with magnetic coupling (DLW-M). Here BAS appears as an absorbing load connected to the DLW-M accelerating structure by rectangular waveguide allowing to have theoretical zero reflection at RF input. Such system also provides possibility of plain beam output energy adjustment. Studies of the structure were carried out using equivalent circuits methods and numerical 3D-modeling. Beam dynamics was calculated.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOW022
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TUPOW023	New 10 MeV High-power Electron Linac for Industrial Application	1794
	S.M. Polozov, D.S. Bazyl, T.V. Bondarenko, M. Gusarova, Yu.D. Kliuchevskaia, M.V. Lalayan, V.I. Rashchikov, E.A. Savin MEPhI, Moscow, Russia M.I. Demsky, A.A. Eliseev, V.V. Krotov, D.E. Trifonov CORAD Ltd., St. Petersburg, Russia B.S. Han, W.G. Kang, H.G. Park EB TECH Co. Ltd., Daejeon, Republic of Korea
	Joint team of CORAD and MEPhI developed a new industrial accelerating structure for average beam power up to 20 kW and energy range from 7.5 to 10 MeV. The use of modern methods and codes for beam dynamics simulation, raised coupling coefficient and group velocity of SW biperiodic accelerating structure allowed to reach high pulse power utilization and obtain high efficiency. Gentle buncher provides high capturing coefficient and narrow energy spectrum. The first linear accelerator with this structure was constructed and tested in collaboration with the company EB Tech.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOW023
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TUPOW024	Compact Standing Wave Electron Linac with the Hybrid Accelerating and Power Generation Cell	1797
SUPSS015	use link to see paper's listing under its alternate paper code
	E.A. Savin, S.V. Matsievskiy, N.P. Sobenin, I.D. Sokolov MEPhI, Moscow, Russia A.A. Zavadtsev Nano, Moscow, Russia
	Compact electron linear accelerators for small energies are now found their place in the industrial market. Such accelerators are used for cancer treatment, cargo inspection, when one needs higher dose that X-ray source can produce, food and medicaments irradiation etc. Acceleration structures themselves are already developed very well, so the most important issue now ' is to make the whole installation with power supply, RF tracts, cooling system ' as smaller as possible to provide the structure mobility. In this article we present the development how to combine a power supply (usually it is a klystron, IOT, magnetron or solid state amplifier) with the accelerating cell itself, that can decrease installation size at least twice. No RF tracts needed, no reflected power will occur, so no circulator needed. Different power input combinations have been studied, but the smallest and the most efficient one has been manufactured for cold tests at S-band frequency range. In this structure it is very easy to vary accelerating voltage simply changing the generator beam current or the generator beam accelerating voltage.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOW024
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TUPOY041	A Metal-Dielectric Micro-Linac for Radiography Source Replacement	1992
	A.V. Smirnov, S. Boucher, S.V. Kutsaev RadiaBeam Systems, Santa Monica, California, USA R.B. Agustsson, R.D.B. Berry, J.J. Hartzell, J. McNevin, A.Y. Murokh RadiaBeam, Santa Monica, California, USA G. Leyh LOD, Brisbane, USA E.A. Savin MEPhI, Moscow, Russia
	Funding: * US Department of Energy Contract # DE-SC0011370 To improve public security and prevent the diversion of radioactive material for Radiation Dispersion Devices, RadiaBeam is developing an inexpensive, portable, easy-to-manufacture linac structure to allow effective capture of a ~13 keV electron beam injected from a conventional electron gun and acceleration to a final energy of ~ 1 MeV. The bremsstrahlung X-rays produced by the electron beam on a high-Z converter at the end of the linac will match the penetration and dose rate of a typical ~100 Ci or more Ir-192 source. The tubular Disk-and-Ring structure under development consists of metal and dielectric elements that reduce or even eliminate multi-cell, multi-step brazing. This may allow significant simplification of the fabrication process to enable inexpensive mass-production required for replacement of the ~55,000 radionuclide sources in the US
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOY041
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Paper

Title

Page

Single-shot THz Spectrometer for Measurement of RF Breakdown in mm-wave Accelerators

374

S.V. Kutsaev, A.Y. Murokh, M. Ruelas, E.A. Savin, H.L. To
RadiaBeam Systems, Santa Monica, California, USA
M. Dal Forno, V.A. Dolgashev
SLAC, Menlo Park, California, USA
V. Goncharik
Logicware Inc, New York, USA
E.A. Savin
MEPhI, Moscow, Russia

Funding: This work was supported by the U.S. Department of Energy, Office of High Energy Physics, under contract DE-SC0013684
We present a new instrument designed to detect RF pulse shortening caused by vacuum RF breakdown in mm-wave particle accelerators. RF breakdown limits the performance of high gradient RF accelerators. To understand the properties of these breakdowns, it is necessary to have diagnostics that reliably detect RF breakdowns. In X-band or S-band accelerators, RF breakdowns are detected by measuring RF pulse shortening, vacuum burst, or, if current monitors are available, spikes in the field-emitted currents. In mm-wave accelerators, all of these methods are difficult to use. In our experiments, we could not measure RF pulse shortening directly with a crystal detector because the RF pulse is very short'just a few nanoseconds'and changes in the measured signal were masked by RF amplitude jitter. To overcome this limitation, we built a single-shot spectrometer with a frequency range of 117-125 GHz and a resolution of 0.1 GHz. The spectrometer should be able to measure the widening of the spectrum caused by the shortening of nanosecond-long pulses. We present design considerations, first experimental results obtained at FACET, and planned future improvements for the spectrometer.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMR056

Export •

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

TUPOW022

Hybrid Electron Linac With Standing and Travelling Wave Accelerating Sections

1791

S.V. Matsievskiy, A.V. Bulanov, V.I. Kaminskiy, E.A. Savin, N.P. Sobenin
MEPhI, Moscow, Russia
R.Yu. Alekhanov
NRNU, Moscow, Russia

Hybrid electron linacs with standing and travelling wave accelerating sections are not well described in literature. Limited number of studies have shown that application of these systems makes it possible to develop a compact linac with high efficiency and simpler power system. Typically, these systems use well-studied bi-periodical accelerating structure (BAS) cells for a standing wave section and disc-loaded waveguides (DLW) for a traveling wave section. This paper describes the development of such system using DLW cells with magnetic coupling (DLW-M). Here BAS appears as an absorbing load connected to the DLW-M accelerating structure by rectangular waveguide allowing to have theoretical zero reflection at RF input. Such system also provides possibility of plain beam output energy adjustment. Studies of the structure were carried out using equivalent circuits methods and numerical 3D-modeling. Beam dynamics was calculated.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOW022

Export •

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

TUPOW023

New 10 MeV High-power Electron Linac for Industrial Application

1794

S.M. Polozov, D.S. Bazyl, T.V. Bondarenko, M. Gusarova, Yu.D. Kliuchevskaia, M.V. Lalayan, V.I. Rashchikov, E.A. Savin
MEPhI, Moscow, Russia
M.I. Demsky, A.A. Eliseev, V.V. Krotov, D.E. Trifonov
CORAD Ltd., St. Petersburg, Russia
B.S. Han, W.G. Kang, H.G. Park
EB TECH Co. Ltd., Daejeon, Republic of Korea

Joint team of CORAD and MEPhI developed a new industrial accelerating structure for average beam power up to 20 kW and energy range from 7.5 to 10 MeV. The use of modern methods and codes for beam dynamics simulation, raised coupling coefficient and group velocity of SW biperiodic accelerating structure allowed to reach high pulse power utilization and obtain high efficiency. Gentle buncher provides high capturing coefficient and narrow energy spectrum. The first linear accelerator with this structure was constructed and tested in collaboration with the company EB Tech.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOW023

Export •

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

TUPOW024

Compact Standing Wave Electron Linac with the Hybrid Accelerating and Power Generation Cell

1797

SUPSS015

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

E.A. Savin, S.V. Matsievskiy, N.P. Sobenin, I.D. Sokolov
MEPhI, Moscow, Russia
A.A. Zavadtsev
Nano, Moscow, Russia

Compact electron linear accelerators for small energies are now found their place in the industrial market. Such accelerators are used for cancer treatment, cargo inspection, when one needs higher dose that X-ray source can produce, food and medicaments irradiation etc. Acceleration structures themselves are already developed very well, so the most important issue now ' is to make the whole installation with power supply, RF tracts, cooling system ' as smaller as possible to provide the structure mobility. In this article we present the development how to combine a power supply (usually it is a klystron, IOT, magnetron or solid state amplifier) with the accelerating cell itself, that can decrease installation size at least twice. No RF tracts needed, no reflected power will occur, so no circulator needed. Different power input combinations have been studied, but the smallest and the most efficient one has been manufactured for cold tests at S-band frequency range. In this structure it is very easy to vary accelerating voltage simply changing the generator beam current or the generator beam accelerating voltage.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOW024

Export •

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

TUPOY041

A Metal-Dielectric Micro-Linac for Radiography Source Replacement

1992

A.V. Smirnov, S. Boucher, S.V. Kutsaev
RadiaBeam Systems, Santa Monica, California, USA
R.B. Agustsson, R.D.B. Berry, J.J. Hartzell, J. McNevin, A.Y. Murokh
RadiaBeam, Santa Monica, California, USA
G. Leyh
LOD, Brisbane, USA
E.A. Savin
MEPhI, Moscow, Russia

Funding: * US Department of Energy Contract # DE-SC0011370
To improve public security and prevent the diversion of radioactive material for Radiation Dispersion Devices, RadiaBeam is developing an inexpensive, portable, easy-to-manufacture linac structure to allow effective capture of a ~13 keV electron beam injected from a conventional electron gun and acceleration to a final energy of ~ 1 MeV. The bremsstrahlung X-rays produced by the electron beam on a high-Z converter at the end of the linac will match the penetration and dose rate of a typical ~100 Ci or more Ir-192 source. The tubular Disk-and-Ring structure under development consists of metal and dielectric elements that reduce or even eliminate multi-cell, multi-step brazing. This may allow significant simplification of the fabrication process to enable inexpensive mass-production required for replacement of the ~55,000 radionuclide sources in the US

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOY041

Export •

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