LINAC2016 - List of Authors (Yamazaki, Y.)

Paper	Title	Page
MO1A01	The FRIB Superconducting Linac - Status and Plans	1
	J. Wei, H. Ao, S. Beher, N.K. Bultman, F. Casagrande, C. Compton, L.R. Dalesio, K.D. Davidson, A. Facco, F. Feyzi, V. Ganni, A. Ganshyn, P.E. Gibson, T. Glasmacher, W. Hartung, L. Hodges, L.T. Hoff, H.-C. Hseuh, A. Hussain, M. Ikegami, S. Jones, K. Kranz, R.E. Laxdal, S.M. Lidia, G. Machicoane, F. Marti, S.J. Miller, D.G. Morris, A.C. Morton, J.A. Nolen, P.N. Ostroumov, J.T. Popielarski, L. Popielarski, G. Pozdeyev, T. Russo, K. Saito, G. Shen, S. Stanley, H. Tatsumoto, T. Xu, Y. Yamazaki FRIB, East Lansing, USA K. Dixon, M. Wiseman JLab, Newport News, Virginia, USA A. Facco INFN/LNL, Legnaro (PD), Italy K. Hosoyama KEK, Ibaraki, Japan H.-C. Hseuh BNL, Upton, Long Island, New York, USA M.P. Kelly, J.A. Nolen ANL, Argonne, Illinois, USA R.E. Laxdal TRIUMF, Vancouver, Canada
	With an average beam power two orders of magnitude higher than operating heavy-ion facilities, the Facility for Rare Isotope Beams (FRIB) stands at the power frontier of the accelerator family. This report summarizes the current design and construction status as well as plans for commissioning, operations and upgrades. Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661 and the National Science Foundation under Cooperative Agreement PHY-1102511.
	Slides MO1A01 [48.813 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MO1A01
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TUPRC019	Beam Instabilities in Electron Cyclotron Resonance Ion Sources	455
SPWR041	use link to see paper's listing under its alternate paper code
	B.C. Isherwood MSU, East Lansing, Michigan, USA G. Machicoane, G. Pozdeyev NSCL, East Lansing, Michigan, USA G. Machicoane, G. Pozdeyev, Y. Yamazaki FRIB, East Lansing, Michigan, USA
	Funding: This research is funded by joint assistance from the NSF and D.O.E. Accelerator facilities for radioactive beams and low energy nuclear physics such as FRIB require intense, stable ion beam currents in order to achieve required reaction rates for rare and undiscovered isotopes. Presently, the only way to produce intense Continuous Wave beams of highly-charged, medium to heavy-mass ions is with Electron Cyclotron Resonance Ion Sources (ECRIS). The complex nature of these devices causes temporal instabilities to occur, most notably: Slow and fast instabilities. Slow instabilities and drifts, occurring over hours, decay the beam current intensity due to variations in ambient and hardware conditions. These drifts require beam operators to constantly monitor and tune ECRIS plasma parameters in order to maintain experimental beam requirements. Fast instabilities, in the form of ms oscillations, occur at operational parameters needed for high-intensity, high-charge state beams. These oscillations cause sudden drops in beam current of the order of 30%. We present here initial results of recent measurements to investigate these instabilities. Results for slow instabilities indicate a linear decay of beam intensity following a sharp current drop due to a brief source conditioning period. Results for fast instabilities show a relationship between the frequency and amplitude of beam oscillations and the electric potential of the plasma chamber bias disk.
	Poster TUPRC019 [0.817 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPRC019
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TUP106024	Optimizing Cavity Choice for FRIB Energy Upgrade Plan	637
SPWR033	use link to see paper's listing under its alternate paper code
	S. Shanab, K. Saito, Y. Yamazaki FRIB, East Lansing, Michigan, USA
	Isotope production yield rate is directly proportional to beam power, especially for heavy ions. Higher beam kinetic energy on target drives more isotope yield. FRIB has an energy upgrade plan up to ≥ 400 MeV/u for Uranium and already prepared a vacant space in the design stage and cryogenic capacity that accommodates for the energy upgrade plan[1]. This upgrade requires an optimized linac design and challenging technology for cavity performance improvement. In this paper, we will approach this issue concerning; maximizing final energy, optimum beta, cavity operating frequency, cryogenic power, fabrication and cost in order to develop a cavity that is suitable for the energy upgrade plan.
	Poster TUP106024 [1.343 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUP106024
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WE2A02	FRIB Cryomodule Design and Production	673
	T. Xu, H. Ao, B. Bird, N.K. Bultman, E.E. Burkhardt, F. Casagrande, C. Compton, J.L. Crisp, K.D. Davidson, K. Elliott, A. Facco, V. Ganni, A. Ganshyn, W. Hartung, M. Ikegami, P. Knudsen, S.M. Lidia, I.M. Malloch, S.J. Miller, D.G. Morris, P.N. Ostroumov, J.T. Popielarski, L. Popielarski, M.A. Reaume, K. Saito, S. Shanab, G. Shen, M. Shuptar, S. Stark, J. Wei, J.D. Wenstrom, M. Xu, Y. Xu, Y. Yamazaki, Z. Zheng FRIB, East Lansing, USA A. Facco INFN/LNL, Legnaro (PD), Italy K. Hosoyama KEK, Ibaraki, Japan M.P. Kelly ANL, Argonne, Illinois, USA R.E. Laxdal TRIUMF, Vancouver, Canada M. Wiseman JLab, Newport News, Virginia, USA
	Funding: U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661 The Facility for Rare Isotope Beams (FRIB), under con-struction at Michigan State University, will utilize a driver linac to accelerate stable ion beams from protons to ura-nium up to energies of >200 MeV per nucleon with a beam power of up to 400 kW. Superconducting technology is widely used in the FRIB project, including the ion sources, linac, and experiment facilities. The FRIB linac consists of 48 cryomodules containing a total of 332 superconducting radio-frequency (SRF) resonators and 69 superconducting solenoids. We report on the design and the construction of FRIB cryomodules.
	Slides WE2A02 [3.823 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-WE2A02
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THOP10	Design and Commissioning of FRIB Multipacting-Free Fundamental Power Coupler	767
THPLR010	use link to see paper's listing under its alternate paper code
	Z. Zheng, J.T. Popielarski, K. Saito, S. Stark, T. Xu, Y. Yamazaki FRIB, East Lansing, USA
	Funding: *Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661 The original Fundamental Power Coupler (FPC) of Half-Wave Resonator (HWR) for the Facility of Rare Isotope Beams (FRIB) requires multipacting conditioning at operating RF power which is up to 5 kW Continue Wave (CW). Conditioning takes a lot of time and RF power, and its elimination is highly desirable. To significantly shorten the RF conditioning, we developed a multipacting-free coupler design. This paper reports the latest progress in the optimization and prototype tests of multipacting-free coupler. The choke structure is removed and coupler geometry is further modified to protect the coupler RF window from the electron bombardment. The comparison result of multipacting-free coupler with original coupler was performed on automatic conditioning system, which showed significantly time reducing for RF conditioning.
	Slides THOP10 [2.442 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THOP10
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Paper

Title

Page

The FRIB Superconducting Linac - Status and Plans

1

J. Wei, H. Ao, S. Beher, N.K. Bultman, F. Casagrande, C. Compton, L.R. Dalesio, K.D. Davidson, A. Facco, F. Feyzi, V. Ganni, A. Ganshyn, P.E. Gibson, T. Glasmacher, W. Hartung, L. Hodges, L.T. Hoff, H.-C. Hseuh, A. Hussain, M. Ikegami, S. Jones, K. Kranz, R.E. Laxdal, S.M. Lidia, G. Machicoane, F. Marti, S.J. Miller, D.G. Morris, A.C. Morton, J.A. Nolen, P.N. Ostroumov, J.T. Popielarski, L. Popielarski, G. Pozdeyev, T. Russo, K. Saito, G. Shen, S. Stanley, H. Tatsumoto, T. Xu, Y. Yamazaki
FRIB, East Lansing, USA
K. Dixon, M. Wiseman
JLab, Newport News, Virginia, USA
A. Facco
INFN/LNL, Legnaro (PD), Italy
K. Hosoyama
KEK, Ibaraki, Japan
H.-C. Hseuh
BNL, Upton, Long Island, New York, USA
M.P. Kelly, J.A. Nolen
ANL, Argonne, Illinois, USA
R.E. Laxdal
TRIUMF, Vancouver, Canada

With an average beam power two orders of magnitude higher than operating heavy-ion facilities, the Facility for Rare Isotope Beams (FRIB) stands at the power frontier of the accelerator family. This report summarizes the current design and construction status as well as plans for commissioning, operations and upgrades.
Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661 and the National Science Foundation under Cooperative Agreement PHY-1102511.

Slides MO1A01 [48.813 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MO1A01

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TUPRC019

Beam Instabilities in Electron Cyclotron Resonance Ion Sources

455

SPWR041

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

B.C. Isherwood
MSU, East Lansing, Michigan, USA
G. Machicoane, G. Pozdeyev
NSCL, East Lansing, Michigan, USA
G. Machicoane, G. Pozdeyev, Y. Yamazaki
FRIB, East Lansing, Michigan, USA

Funding: This research is funded by joint assistance from the NSF and D.O.E.
Accelerator facilities for radioactive beams and low energy nuclear physics such as FRIB require intense, stable ion beam currents in order to achieve required reaction rates for rare and undiscovered isotopes. Presently, the only way to produce intense Continuous Wave beams of highly-charged, medium to heavy-mass ions is with Electron Cyclotron Resonance Ion Sources (ECRIS). The complex nature of these devices causes temporal instabilities to occur, most notably: Slow and fast instabilities. Slow instabilities and drifts, occurring over hours, decay the beam current intensity due to variations in ambient and hardware conditions. These drifts require beam operators to constantly monitor and tune ECRIS plasma parameters in order to maintain experimental beam requirements. Fast instabilities, in the form of ms oscillations, occur at operational parameters needed for high-intensity, high-charge state beams. These oscillations cause sudden drops in beam current of the order of 30%. We present here initial results of recent measurements to investigate these instabilities. Results for slow instabilities indicate a linear decay of beam intensity following a sharp current drop due to a brief source conditioning period. Results for fast instabilities show a relationship between the frequency and amplitude of beam oscillations and the electric potential of the plasma chamber bias disk.

Poster TUPRC019 [0.817 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPRC019

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TUP106024

Optimizing Cavity Choice for FRIB Energy Upgrade Plan

637

SPWR033

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

S. Shanab, K. Saito, Y. Yamazaki
FRIB, East Lansing, Michigan, USA

Isotope production yield rate is directly proportional to beam power, especially for heavy ions. Higher beam kinetic energy on target drives more isotope yield. FRIB has an energy upgrade plan up to ≥ 400 MeV/u for Uranium and already prepared a vacant space in the design stage and cryogenic capacity that accommodates for the energy upgrade plan[1]. This upgrade requires an optimized linac design and challenging technology for cavity performance improvement. In this paper, we will approach this issue concerning; maximizing final energy, optimum beta, cavity operating frequency, cryogenic power, fabrication and cost in order to develop a cavity that is suitable for the energy upgrade plan.

Poster TUP106024 [1.343 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUP106024

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WE2A02

FRIB Cryomodule Design and Production

673

T. Xu, H. Ao, B. Bird, N.K. Bultman, E.E. Burkhardt, F. Casagrande, C. Compton, J.L. Crisp, K.D. Davidson, K. Elliott, A. Facco, V. Ganni, A. Ganshyn, W. Hartung, M. Ikegami, P. Knudsen, S.M. Lidia, I.M. Malloch, S.J. Miller, D.G. Morris, P.N. Ostroumov, J.T. Popielarski, L. Popielarski, M.A. Reaume, K. Saito, S. Shanab, G. Shen, M. Shuptar, S. Stark, J. Wei, J.D. Wenstrom, M. Xu, Y. Xu, Y. Yamazaki, Z. Zheng
FRIB, East Lansing, USA
A. Facco
INFN/LNL, Legnaro (PD), Italy
K. Hosoyama
KEK, Ibaraki, Japan
M.P. Kelly
ANL, Argonne, Illinois, USA
R.E. Laxdal
TRIUMF, Vancouver, Canada
M. Wiseman
JLab, Newport News, Virginia, USA

Funding: U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661
The Facility for Rare Isotope Beams (FRIB), under con-struction at Michigan State University, will utilize a driver linac to accelerate stable ion beams from protons to ura-nium up to energies of >200 MeV per nucleon with a beam power of up to 400 kW. Superconducting technology is widely used in the FRIB project, including the ion sources, linac, and experiment facilities. The FRIB linac consists of 48 cryomodules containing a total of 332 superconducting radio-frequency (SRF) resonators and 69 superconducting solenoids. We report on the design and the construction of FRIB cryomodules.

Slides WE2A02 [3.823 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-WE2A02

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

THOP10

Design and Commissioning of FRIB Multipacting-Free Fundamental Power Coupler

767

THPLR010

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

Z. Zheng, J.T. Popielarski, K. Saito, S. Stark, T. Xu, Y. Yamazaki
FRIB, East Lansing, USA

Funding: *Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661
The original Fundamental Power Coupler (FPC) of Half-Wave Resonator (HWR) for the Facility of Rare Isotope Beams (FRIB) requires multipacting conditioning at operating RF power which is up to 5 kW Continue Wave (CW). Conditioning takes a lot of time and RF power, and its elimination is highly desirable. To significantly shorten the RF conditioning, we developed a multipacting-free coupler design. This paper reports the latest progress in the optimization and prototype tests of multipacting-free coupler. The choke structure is removed and coupler geometry is further modified to protect the coupler RF window from the electron bombardment. The comparison result of multipacting-free coupler with original coupler was performed on automatic conditioning system, which showed significantly time reducing for RF conditioning.

Slides THOP10 [2.442 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THOP10

Export •

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