LINAC2016 - List of Keywords (focusing)

Paper	Title	Other Keywords	Page
MOOP07	Development of Ultracold Neutron Accelerator for Time Focusing of Pulsed Neutrons	neutron, cavity, controls, resonance	56
	S. Imajo Kyoto University, Kyoto, Japan T. Ino, K. Mishima KEK, Ibaraki, Japan Y. Iwashita Kyoto ICR, Uji, Kyoto, Japan M. Kitaguchi, H.M. Shimizu Nagoya University, Nagoya, Japan S. Yamashita ICEPP, Tokyo, Japan
	Low energy neutron accelerator can be realized by the combination of an adiabatic fast passage spin flipper and a gradient magnetic field. Neutrons have magnetic moments, so that the accumulated potential energies are not cancelled before and after passage of a magnetic field and their kinetic energies change in case their spins are flipped in the field. This accelerator handles lower kinetic energy neutrons than approximately 300 neV. Currently we have developed the advanced version which makes it possible to handle broader kinetic energy range. The design and measured characteristics are described.
	Slides MOOP07 [1.313 MB]
	Poster MOOP07 [1.389 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOOP07
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPRC020	Primary Beam Dynamic Simulation of Double Drift Double Buncher System for SPES Project	rfq, solenoid, simulation, ion	117
	A.V. Ziiatdinova MEPhI, Moscow, Russia L. Bellan, M. Comunian, A. Pisent INFN/LNL, Legnaro (PD), Italy A.V. Ziiatdinova ITEP, Moscow, Russia
	SPES (Selective Production of Exotic Species) is a facility intended for production of neutron-rich Radioactive Ion Beams (RIBs) at the National Institute of Nuclear Physics (INFN-LNL, Legnaro, Italy). Exotic nuclei production based on the ISOL (Isotope Separation On-Line) technology using UCx target. Neutron-rich nuclei will be generated by uranium fission under the influence of proton beam from cyclotron. After that, RIBs will be reaccelerated by the ALPI (Acceleratore Lineare Per Ioni). RFQ (Radio Frequency Quadrupole) will be used as a front-end part of the ALPI. Double drift double buncher system is planned to install before RFQ for increasing transmission. This article is dedicated to beam dynamic simulation and laying-out of transport line at section before ALPI.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPRC020
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MOP106022	Generation of Coherent Undulator Radiation at ELPH, Tohoku University	radiation, undulator, electron, ion	330
	S. Kashiwagi, T. Abe, H. Hama, F. Hinode, T. Muto, I. Nagasawa, K. Nanbu, H. Saito, Y. Saito, Y. Shibasaki, K. Takahashi Tohoku University, Research Center for Electron Photon Science, Sendai, Japan
	A test accelerator as a coherent terahertz source (t-ACTS) has been under development at Tohoku University, in which an intense coherent terahertz (THz) radiation generated by an extremely short electron bunch. Velocity bunching scheme in a traveling accelerating structure is employed to generate femtosecond electron bunches. Spatial and temporal coherent radiation in THz region can be produced by the electron bunches with small transverse emittance. A long-period undulator, which has 25 periods with a period length of 10 cm and a peak magnetic field of 0.41 T, has been also developed and installed to provide intense coherent THz undulator radiation. By optimizing the bunch length, we found that it is possible to generate a coherent undulator radiation that contain only the fundamental wave from numerical studies. We are planning an experiment with 30 MeV beam to generate a coherent undulator radiation of 2.5THz. In the conference, we will report the preliminary experimental results.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOP106022
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TUOP11	Methods for Bunch Shape Monitor Phase Resolution Improvement	electron, linac, space-charge, quadrupole	408
	A. Feschenko, S.A. Gavrilov RAS/INR, Moscow, Russia
	Bunch shape monitors, based on secondary electrons emission, are widely used for measurements of longitudinal bunch profiles during a linac commissioning and initial optimization of beam dynamics. A typical phase resolution of these devices is about 1°. However it becomes insufficient for new modern linacs, which require a better resolution. Some developed methods for a phase resolution improvement are discussed.
	Slides TUOP11 [21.248 MB]
	Poster TUOP11 [1.888 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUOP11
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPRC004	Frequency Spectra From Solenoid Lattice Orbits	lattice, solenoid, ion, linac	417
	C.J. Richard NSCL, East Lansing, Michigan, USA S.M. Lidia FRIB, East Lansing, USA
	Multi-charge state heavy ion beams have been proposed to increase average beam intensity in rare isotope drive linacs. However, the dynamics of multi-charge state beams make it challenging to optimize the beam quality in low energy linacs. One of the primary complications is that the multiple charge states introduce different focusing effects in the beam dynamics. This leads to a large frequency spectrum in the transverse motion of the beam centroid. Matlab simulations are used to describe how the frequency spectrum of the centroid transforms when the reference charge state is changed in accelerating, space charge free solenoid lattices. These frequency shifts can then be used to predict the behavior of beam of known composition using the frequency spectrum of BPM signals.
	Poster TUPRC004 [1.192 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPRC004
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TUPLR054	RFQ Vane Shapes for Efficient Acceleration	acceleration, rfq, multipole, quadrupole	581
	Y. Iwashita, Y. Fuwa Kyoto ICR, Uji, Kyoto, Japan R.A. Jameson IAP, Frankfurt am Main, Germany
	RFQ vane shapes for efficient acceleration are under investigation by introducing more terms in addition to the two term potential. They can incorporate with the feature of the trapezoidal shape modulation with less multipole components, while higher acceleration efficiency is expected. The simulation study will be presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR054
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPRC026	Optical Design of the PI-Test MEBT Beam Scraping System	SRF, linac, emittance, space-charge	827
	A. Saini, A.V. Shemyakin Fermilab, Batavia, Illinois, USA
	PI-Test [1] is an accelerator facility under construction at Fermilab that will provide a platform to demonstrate critical technologies and concept of front-end of the PIP-II superconducting radio frequency (SRF) linac. It will be capable to accelerate an H⁻ ion beam with average current of 2 mA up to 25 MeV in continuous wave (CW) regime. To protect the SRF components from beam irradiation, the Medium Energy Beam Transport (MEBT) section of PI-Test includes an elaborated beam scraping system. It consists of four assemblies spread along the MEBT, with each assembly composed of four radiation-cooled, electrically isolated plates that can be moved into the beam in horizontal and vertical direction. The primary objectives of scraping system are to intercept particles with large transverse action and to protect the beamline elements and SRF linac in case of errors with beam focusing or steering. In this paper we formulate requirements for the scraping system and discuss factors affecting its efficiency. An optical design compatible with PI-Test MEBT is also presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPRC026
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPLR007	Dark Current Studies in ILC Main Linac	linac, radiation, operation, electron	855
	A.I. Sukhanov, I.L. Rakhno, N. Solyak, I.S. Tropin Fermilab, Batavia, Illinois, USA
	Studies and optimization of design of the International Linear Collider (ILC) based on the TESLA-type 9-cell 1.3 GHz superconducting RF (SRF) cavities are currently underway. Dark current electron generated by field emission (FE) in SRF cavities can be captured and accelerated in the main ILC linac up to very high energy before they are removed by focusing and steering magnets. Dark current electrons, interacting with the materials surrounding SRF cavities, produce electromagnetic showers and contribute to the radiation in the main ILC tunnel. In this paper present preliminary results of the simulation study of dark current in the ILC linac.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR007
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THPLR042	Beam Dynamics Studies for a Compact Carbon Ion Linac for Therapy	ion, linac, DTL, rfq	946
	A.S. Plastun, B. Mustapha, A. Nassiri, P.N. Ostroumov ANL, Argonne, Illinois, USA L. Faillace, S.V. Kutsaev, E.A. Savin RadiaBeam, Santa Monica, California, 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 Accelerator Stewardship Grant, Proposal No. 0000219678 Feasibility of an Advanced Compact Carbon Ion Linac (ACCIL) for hadron therapy is being studied at Argonne National Laboratory in collaboration with RadiaBeam Technologies. The 45-meter long linac is designed to deliver 10⁹ carbon ions per second with variable energy from 45 MeV/u to 450 MeV/u. S-band structure provides the acceleration in this range. The carbon beam energy can be adjusted from pulse to pulse, making 3D tumor scanning straightforward and fast. Front end accelerating structures such as RFQ, DTL and coupled DTL are designed to operate at lower frequencies. The design of the linac was accompanied with extensive end-to-end beam dynamics studies which are presented in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR042
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

MOOP07

Development of Ultracold Neutron Accelerator for Time Focusing of Pulsed Neutrons

neutron, cavity, controls, resonance

56

S. Imajo
Kyoto University, Kyoto, Japan
T. Ino, K. Mishima
KEK, Ibaraki, Japan
Y. Iwashita
Kyoto ICR, Uji, Kyoto, Japan
M. Kitaguchi, H.M. Shimizu
Nagoya University, Nagoya, Japan
S. Yamashita
ICEPP, Tokyo, Japan

Low energy neutron accelerator can be realized by the combination of an adiabatic fast passage spin flipper and a gradient magnetic field. Neutrons have magnetic moments, so that the accumulated potential energies are not cancelled before and after passage of a magnetic field and their kinetic energies change in case their spins are flipped in the field. This accelerator handles lower kinetic energy neutrons than approximately 300 neV. Currently we have developed the advanced version which makes it possible to handle broader kinetic energy range. The design and measured characteristics are described.

Slides MOOP07 [1.313 MB]

Poster MOOP07 [1.389 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOOP07

Export •

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

MOPRC020

Primary Beam Dynamic Simulation of Double Drift Double Buncher System for SPES Project

rfq, solenoid, simulation, ion

117

A.V. Ziiatdinova
MEPhI, Moscow, Russia
L. Bellan, M. Comunian, A. Pisent
INFN/LNL, Legnaro (PD), Italy
A.V. Ziiatdinova
ITEP, Moscow, Russia

SPES (Selective Production of Exotic Species) is a facility intended for production of neutron-rich Radioactive Ion Beams (RIBs) at the National Institute of Nuclear Physics (INFN-LNL, Legnaro, Italy). Exotic nuclei production based on the ISOL (Isotope Separation On-Line) technology using UCx target. Neutron-rich nuclei will be generated by uranium fission under the influence of proton beam from cyclotron. After that, RIBs will be reaccelerated by the ALPI (Acceleratore Lineare Per Ioni). RFQ (Radio Frequency Quadrupole) will be used as a front-end part of the ALPI. Double drift double buncher system is planned to install before RFQ for increasing transmission. This article is dedicated to beam dynamic simulation and laying-out of transport line at section before ALPI.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPRC020

Export •

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

MOP106022

Generation of Coherent Undulator Radiation at ELPH, Tohoku University

radiation, undulator, electron, ion

330

S. Kashiwagi, T. Abe, H. Hama, F. Hinode, T. Muto, I. Nagasawa, K. Nanbu, H. Saito, Y. Saito, Y. Shibasaki, K. Takahashi
Tohoku University, Research Center for Electron Photon Science, Sendai, Japan

A test accelerator as a coherent terahertz source (t-ACTS) has been under development at Tohoku University, in which an intense coherent terahertz (THz) radiation generated by an extremely short electron bunch. Velocity bunching scheme in a traveling accelerating structure is employed to generate femtosecond electron bunches. Spatial and temporal coherent radiation in THz region can be produced by the electron bunches with small transverse emittance. A long-period undulator, which has 25 periods with a period length of 10 cm and a peak magnetic field of 0.41 T, has been also developed and installed to provide intense coherent THz undulator radiation. By optimizing the bunch length, we found that it is possible to generate a coherent undulator radiation that contain only the fundamental wave from numerical studies. We are planning an experiment with 30 MeV beam to generate a coherent undulator radiation of 2.5THz. In the conference, we will report the preliminary experimental results.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOP106022

Export •

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

TUOP11

Methods for Bunch Shape Monitor Phase Resolution Improvement

electron, linac, space-charge, quadrupole

408

A. Feschenko, S.A. Gavrilov
RAS/INR, Moscow, Russia

Bunch shape monitors, based on secondary electrons emission, are widely used for measurements of longitudinal bunch profiles during a linac commissioning and initial optimization of beam dynamics. A typical phase resolution of these devices is about 1°. However it becomes insufficient for new modern linacs, which require a better resolution. Some developed methods for a phase resolution improvement are discussed.

Slides TUOP11 [21.248 MB]

Poster TUOP11 [1.888 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUOP11

Export •

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

TUPRC004

Frequency Spectra From Solenoid Lattice Orbits

lattice, solenoid, ion, linac

417

C.J. Richard
NSCL, East Lansing, Michigan, USA
S.M. Lidia
FRIB, East Lansing, USA

Multi-charge state heavy ion beams have been proposed to increase average beam intensity in rare isotope drive linacs. However, the dynamics of multi-charge state beams make it challenging to optimize the beam quality in low energy linacs. One of the primary complications is that the multiple charge states introduce different focusing effects in the beam dynamics. This leads to a large frequency spectrum in the transverse motion of the beam centroid. Matlab simulations are used to describe how the frequency spectrum of the centroid transforms when the reference charge state is changed in accelerating, space charge free solenoid lattices. These frequency shifts can then be used to predict the behavior of beam of known composition using the frequency spectrum of BPM signals.

Poster TUPRC004 [1.192 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPRC004

Export •

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

TUPLR054

RFQ Vane Shapes for Efficient Acceleration

acceleration, rfq, multipole, quadrupole

581

Y. Iwashita, Y. Fuwa
Kyoto ICR, Uji, Kyoto, Japan
R.A. Jameson
IAP, Frankfurt am Main, Germany

RFQ vane shapes for efficient acceleration are under investigation by introducing more terms in addition to the two term potential. They can incorporate with the feature of the trapezoidal shape modulation with less multipole components, while higher acceleration efficiency is expected. The simulation study will be presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR054

Export •

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

THPRC026

Optical Design of the PI-Test MEBT Beam Scraping System

SRF, linac, emittance, space-charge

827

A. Saini, A.V. Shemyakin
Fermilab, Batavia, Illinois, USA

PI-Test [1] is an accelerator facility under construction at Fermilab that will provide a platform to demonstrate critical technologies and concept of front-end of the PIP-II superconducting radio frequency (SRF) linac. It will be capable to accelerate an H⁻ ion beam with average current of 2 mA up to 25 MeV in continuous wave (CW) regime. To protect the SRF components from beam irradiation, the Medium Energy Beam Transport (MEBT) section of PI-Test includes an elaborated beam scraping system. It consists of four assemblies spread along the MEBT, with each assembly composed of four radiation-cooled, electrically isolated plates that can be moved into the beam in horizontal and vertical direction. The primary objectives of scraping system are to intercept particles with large transverse action and to protect the beamline elements and SRF linac in case of errors with beam focusing or steering. In this paper we formulate requirements for the scraping system and discuss factors affecting its efficiency. An optical design compatible with PI-Test MEBT is also presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPRC026

Export •

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

THPLR007

Dark Current Studies in ILC Main Linac

linac, radiation, operation, electron

855

A.I. Sukhanov, I.L. Rakhno, N. Solyak, I.S. Tropin
Fermilab, Batavia, Illinois, USA

Studies and optimization of design of the International Linear Collider (ILC) based on the TESLA-type 9-cell 1.3 GHz superconducting RF (SRF) cavities are currently underway. Dark current electron generated by field emission (FE) in SRF cavities can be captured and accelerated in the main ILC linac up to very high energy before they are removed by focusing and steering magnets. Dark current electrons, interacting with the materials surrounding SRF cavities, produce electromagnetic showers and contribute to the radiation in the main ILC tunnel. In this paper present preliminary results of the simulation study of dark current in the ILC linac.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR007

Export •

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

THPLR042

Beam Dynamics Studies for a Compact Carbon Ion Linac for Therapy

ion, linac, DTL, rfq

946

A.S. Plastun, B. Mustapha, A. Nassiri, P.N. Ostroumov
ANL, Argonne, Illinois, USA
L. Faillace, S.V. Kutsaev, E.A. Savin
RadiaBeam, Santa Monica, California, 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 Accelerator Stewardship Grant, Proposal No. 0000219678
Feasibility of an Advanced Compact Carbon Ion Linac (ACCIL) for hadron therapy is being studied at Argonne National Laboratory in collaboration with RadiaBeam Technologies. The 45-meter long linac is designed to deliver 10⁹ carbon ions per second with variable energy from 45 MeV/u to 450 MeV/u. S-band structure provides the acceleration in this range. The carbon beam energy can be adjusted from pulse to pulse, making 3D tumor scanning straightforward and fast. Front end accelerating structures such as RFQ, DTL and coupled DTL are designed to operate at lower frequencies. The design of the linac was accompanied with extensive end-to-end beam dynamics studies which are presented in this paper.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR042

Export •

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