IPAC2017 - List of Keywords (high-voltage)

Paper	Title	Other Keywords	Page
TUPVA051	Magnets and Wien Filters for SECAR	dipole, quadrupole, multipole, target	2191
	F. Bødker, N. Hauge, J. Kristensen Danfysik A/S, Taastrup, Denmark G.P.A. Berg, M. Couder University of Notre Dame, Indiana, USA H. Schatz NSCL, East Lansing, Michigan, USA
	The Separator for Capture Reactions, SECAR, is being built at Michigan State University for the study of low-energy capture reactions. The high performance magnets and two large Wien filters required to reach the very high recoil mass separation factor are being designed and produced at Danfysik to the SECAR specifications. The 2.4 m long Wien filters with a weight of 35 ton each including a large vacuum tank have high electrode voltages of ±300 kV combined with a magnetic field of 0.12 T. Challenging design requirements for integrated magnetic and electrostatic field homogeneity combined with tight tolerance on the effective lengths have been meet. The dipole magnets for this facility are special in having stringent ±0.5 mm effective magnetic length specifications in a wide excitation range and the transverse field boundary variation is described by a 4th order polynomial. Most of the dipoles are made with variable segmented field clamps in order to keep the deviation of the magnetic fringe field boundary within the required ±0.1 mm. The wide range of different quadrupole, sextupole and octupole magnets are required to meet the specified magnetic length with a tight tolerance.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA051
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WEPVA024	Design of an Inductive Adder for the FCC Injection Kicker Pulse Generator	kicker, injection, impedance, collider	3312
	D. Woog, M.J. Barnes, L. Ducimetière, J. Holma, T. Kramer CERN, Geneva, Switzerland
	The injection system for a 100 TeV centre-of-mass collider is an important part of the Future Circular Collider (FCC) study. Due to issues with conventional kicker systems, such as self-triggering and long term availability of thyratrons and limitations of HV-cables, innovative design changes are planned for the FCC injection kicker pulse generator. An inductive adder (IA) based on semiconductor (SC) switches is a promising technology for kicker systems. Its modular design, and the possibility of an active ripple suppression are significant advantages. Since the IA is a complex device, with multiple components whose characteristics are important, a detailed design study and construction of a prototype is necessary. This paper summarizes the system requirements and constraints, and describes the main components and design challenges of the prototype IA. It outlines the results from simulations and measurements on different magnetic core materials as well as on SC switches. The paper concludes on the design choices and progress for the prototype to be built at CERN.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA024
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WEPVA099	Influence of Conducting Serigraphy Upon Field Pulse Shape of the SPS Extraction Kicker Systems	kicker, flattop, extraction, impedance	3491
	A. Adraktas, M.J. Barnes, L. Ducimetière CERN, Geneva, Switzerland
	Fast pulsed magnets with ferrite yokes are used for beam extraction from the CERN SPS accelerator. These kickers are transmission line type magnets with a rectangular shaped aperture through which the beam circulates. Unless special precautions are taken, the beam impedance of the yoke can provoke significant induced heating, especially for high intensity beams. Previous upgrades of the SPS extraction kicker magnets have included silver fingers serigraphed on the surface of the ferrite facing the beam, to help shield the ferrite yoke from circulating beam. Beam based measurements of the extracted beam indicated that the serigraphy may influence the shape of the field pulse, causing it to increase slightly in magnitude during the flat-top. Hence theoretical studies have been carried out to determine whether the serigraphy influences the field pulse: these studies are reported in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA099
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WEPVA141	Ion Cyclotron Resonance Heating Transmitter Opening Switch Upgrade	operation, plasma, impedance, resonance	3600
	M.P.J. Gaudreau, M.K. Kempkes, J. Kinross-Wright, R.E. Simpson Diversified Technologies, Inc., Bedford, Massachusetts, USA
	Diversified Technologies Inc. (DTI) has installed a high-power solid-state opening switch upgrade package to replace the mercury ignitron crowbars in the Ion Cyclotron Resonance Heating (ICRH) Transmitters at MIT Plasma Fusion Science Center's (PFSC) Alcator C Mod, a Tokamak-type fusion experimental device. The speed of the series opening switch avoids the large fault currents on the transformer and power feed inherent with a crowbar. This improvement enables re-optimization of the Transformer/Rectifier (T/R) set, ultimately allowing increased power output and increased tetrode reliability. The ratings of the prior high voltage power supply are a compromise between high output power (lower impedance required from the T/R set) and crowbar reliability (higher impedance required from the power supply to limit fault current). DTI's opening switch upgrade safely allows the use of significantly reduced transformer impedance and lower droop, giving increased power as well as improved tube protection. DTI's opening switch kit can readily be adapted to any similar transmitters as an upgrade from a crowbar.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA141
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WEPVA150	New Controller for High Voltage Converter Modulator at Spallation Neutron Source	controls, LabView, interface, timing	3621
	D.L. Brown, X. Geng, S.W. Lee, M. Wezensky, A.P. Zhukov ORNL, Oak Ridge, Tennessee, USA
	Funding: This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. We have developed a new control system for the high voltage converter modulator at the Spallation Neutron Source to replace the original control system designed by Los Alamos National Laboratory which is approaching obsolescence. The new controller, based on national instruments PXI/FlexRIO FPGA hardware, offers enhancements over the original system such as modular construction, flexibility and non-proprietary software. The new controller also provides new capabilities like modulator pulse flattening, waveform capture & first fault detection. This paper will discuss the design of the system, including the human machine interface, based on lessons learned at the Spallation Neutron Source and other projects. It will also discuss performance and other issues related to operation in an accelerator facility which requires high availability. To date half of the high voltage converter modulators have been upgraded with the new controller with the remainder scheduled for completion by mid-2017.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA150
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THPVA059	Development of a New High Power RF Window for S-band Linac	klystron, linac, vacuum, cavity	4576
	W.H. Hwang, J.Y. Choi, Y.D. Joo, S.H. Kim, B.-J. Lee PAL, Pohang, Kyungbuk, Republic of Korea S.J. Roh Vitzrotech Co., Ltd., Ansan City, Kyunggi-Do, Republic of Korea
	A prototype rf window was developed in collaboration with Pohang Accelerator Laboratory (PAL) and domestic companies. The PAL designed the S-band TE012 rf window and conducted the high power performance tests of single rf window to verify the operation characteristics for the application to the PLSII Linac. The test was performed in the in-situ facility consisting of a modulator, klystron, waveguide network, vacuum system, cooling system, and rf analyzing equipment. As the test results with SLED, no breakdown appeared up to 75 MW peak power with 4.5 micro-seconds rf pulse width at a repetition rate of 10 Hz. The test results with the current operation level of PLSII Linac confirms that the rf window well satisfies the criteria of PLS Linac operation.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA059
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Paper

Title

Other Keywords

Page

TUPVA051

Magnets and Wien Filters for SECAR

dipole, quadrupole, multipole, target

2191

F. Bødker, N. Hauge, J. Kristensen
Danfysik A/S, Taastrup, Denmark
G.P.A. Berg, M. Couder
University of Notre Dame, Indiana, USA
H. Schatz
NSCL, East Lansing, Michigan, USA

The Separator for Capture Reactions, SECAR, is being built at Michigan State University for the study of low-energy capture reactions. The high performance magnets and two large Wien filters required to reach the very high recoil mass separation factor are being designed and produced at Danfysik to the SECAR specifications. The 2.4 m long Wien filters with a weight of 35 ton each including a large vacuum tank have high electrode voltages of ±300 kV combined with a magnetic field of 0.12 T. Challenging design requirements for integrated magnetic and electrostatic field homogeneity combined with tight tolerance on the effective lengths have been meet. The dipole magnets for this facility are special in having stringent ±0.5 mm effective magnetic length specifications in a wide excitation range and the transverse field boundary variation is described by a 4th order polynomial. Most of the dipoles are made with variable segmented field clamps in order to keep the deviation of the magnetic fringe field boundary within the required ±0.1 mm. The wide range of different quadrupole, sextupole and octupole magnets are required to meet the specified magnetic length with a tight tolerance.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA051

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

WEPVA024

Design of an Inductive Adder for the FCC Injection Kicker Pulse Generator

kicker, injection, impedance, collider

3312

D. Woog, M.J. Barnes, L. Ducimetière, J. Holma, T. Kramer
CERN, Geneva, Switzerland

The injection system for a 100 TeV centre-of-mass collider is an important part of the Future Circular Collider (FCC) study. Due to issues with conventional kicker systems, such as self-triggering and long term availability of thyratrons and limitations of HV-cables, innovative design changes are planned for the FCC injection kicker pulse generator. An inductive adder (IA) based on semiconductor (SC) switches is a promising technology for kicker systems. Its modular design, and the possibility of an active ripple suppression are significant advantages. Since the IA is a complex device, with multiple components whose characteristics are important, a detailed design study and construction of a prototype is necessary. This paper summarizes the system requirements and constraints, and describes the main components and design challenges of the prototype IA. It outlines the results from simulations and measurements on different magnetic core materials as well as on SC switches. The paper concludes on the design choices and progress for the prototype to be built at CERN.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA024

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WEPVA099

Influence of Conducting Serigraphy Upon Field Pulse Shape of the SPS Extraction Kicker Systems

kicker, flattop, extraction, impedance

3491

A. Adraktas, M.J. Barnes, L. Ducimetière
CERN, Geneva, Switzerland

Fast pulsed magnets with ferrite yokes are used for beam extraction from the CERN SPS accelerator. These kickers are transmission line type magnets with a rectangular shaped aperture through which the beam circulates. Unless special precautions are taken, the beam impedance of the yoke can provoke significant induced heating, especially for high intensity beams. Previous upgrades of the SPS extraction kicker magnets have included silver fingers serigraphed on the surface of the ferrite facing the beam, to help shield the ferrite yoke from circulating beam. Beam based measurements of the extracted beam indicated that the serigraphy may influence the shape of the field pulse, causing it to increase slightly in magnitude during the flat-top. Hence theoretical studies have been carried out to determine whether the serigraphy influences the field pulse: these studies are reported in this paper.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA099

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

WEPVA141

Ion Cyclotron Resonance Heating Transmitter Opening Switch Upgrade

operation, plasma, impedance, resonance

3600

M.P.J. Gaudreau, M.K. Kempkes, J. Kinross-Wright, R.E. Simpson
Diversified Technologies, Inc., Bedford, Massachusetts, USA

Diversified Technologies Inc. (DTI) has installed a high-power solid-state opening switch upgrade package to replace the mercury ignitron crowbars in the Ion Cyclotron Resonance Heating (ICRH) Transmitters at MIT Plasma Fusion Science Center's (PFSC) Alcator C Mod, a Tokamak-type fusion experimental device. The speed of the series opening switch avoids the large fault currents on the transformer and power feed inherent with a crowbar. This improvement enables re-optimization of the Transformer/Rectifier (T/R) set, ultimately allowing increased power output and increased tetrode reliability. The ratings of the prior high voltage power supply are a compromise between high output power (lower impedance required from the T/R set) and crowbar reliability (higher impedance required from the power supply to limit fault current). DTI's opening switch upgrade safely allows the use of significantly reduced transformer impedance and lower droop, giving increased power as well as improved tube protection. DTI's opening switch kit can readily be adapted to any similar transmitters as an upgrade from a crowbar.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA141

Export •

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

WEPVA150

New Controller for High Voltage Converter Modulator at Spallation Neutron Source

controls, LabView, interface, timing

3621

D.L. Brown, X. Geng, S.W. Lee, M. Wezensky, A.P. Zhukov
ORNL, Oak Ridge, Tennessee, USA

Funding: This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy.
We have developed a new control system for the high voltage converter modulator at the Spallation Neutron Source to replace the original control system designed by Los Alamos National Laboratory which is approaching obsolescence. The new controller, based on national instruments PXI/FlexRIO FPGA hardware, offers enhancements over the original system such as modular construction, flexibility and non-proprietary software. The new controller also provides new capabilities like modulator pulse flattening, waveform capture & first fault detection. This paper will discuss the design of the system, including the human machine interface, based on lessons learned at the Spallation Neutron Source and other projects. It will also discuss performance and other issues related to operation in an accelerator facility which requires high availability. To date half of the high voltage converter modulators have been upgraded with the new controller with the remainder scheduled for completion by mid-2017.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA150

Export •

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

THPVA059

Development of a New High Power RF Window for S-band Linac

klystron, linac, vacuum, cavity

4576

W.H. Hwang, J.Y. Choi, Y.D. Joo, S.H. Kim, B.-J. Lee
PAL, Pohang, Kyungbuk, Republic of Korea
S.J. Roh
Vitzrotech Co., Ltd., Ansan City, Kyunggi-Do, Republic of Korea

A prototype rf window was developed in collaboration with Pohang Accelerator Laboratory (PAL) and domestic companies. The PAL designed the S-band TE012 rf window and conducted the high power performance tests of single rf window to verify the operation characteristics for the application to the PLSII Linac. The test was performed in the in-situ facility consisting of a modulator, klystron, waveguide network, vacuum system, cooling system, and rf analyzing equipment. As the test results with SLED, no breakdown appeared up to 75 MW peak power with 4.5 micro-seconds rf pulse width at a repetition rate of 10 Hz. The test results with the current operation level of PLSII Linac confirms that the rf window well satisfies the criteria of PLS Linac operation.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA059

Export •

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