IPAC2016 - List of Keywords (high-voltage)

Paper	Title	Other Keywords	Page
TUPMB007	Research and Development of the Pulse Bump Magnet for the Injection System in CSNS/RCS	injection, neutron, radiation, synchrotron	1118
	L. Huo, M.Y. Huang, W. Kang, Y.Q. Liu, J. Qiu, L. Wang, S. Wang IHEP, Beijing, People's Republic of China
	The H⁻ stripping painting injection is adopted in the Rapid Cycling Synchrotron (RCS) of China Spallation Neutron Source (CSNS). Painting injection is realized by eight pulse bump magnets. The pulse bump magnet is the key of the performance of painting, as well as the beam loss control. The manufacture and the field measurement of the eight pulse bump magnets have been completed. In the development of the magnets, some key technical problems on fabrication of coil were solved, and the field measurement results show that the magnets fulfil the design specification.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMB007
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TUPMB038	Degradation of the Insulation of the LHC Main Dipole Cable when Exposed to High Temperatures	dipole, superconducting-magnet, operation, laser	1186
	V. Raginel, B. Auchmann, D. Kleiven, R. Schmidt, A.P. Verweij, D. Wollmann CERN, Geneva, Switzerland
	Funding: Research supported by the High Luminosity LHC project The energy stored in the LHC beams is substantial and requires a complex machine protection system to protect the equipment. Despite efficient beam absorbers, several failure modes lead to some limited beam impact on superconducting magnets. Thus it is required to understand the damage mechanisms and limits of superconducting magnets due to instantaneous beam impact. This becomes even more important due to the future upgrade of CERNs injector chain for the LHC that will lead to an increase of the beam brightness. A roadmap to perform damage tests on magnet parts has been presented previously. The polyimide insulation of the superconducting cable is identified as one of the critical elements of the magnet. In this contribution, the experimental setup to measure the insulation degradation of LHC main dipole cables due to exposure to high temperature is described. Compressed stacks of insulated Nb-Ti cables have been exposed to a heat treatment within an Argon atmosphere. After each heat treatment, high-voltage measurements verified the dielectric strength of the insulation. The results of this experiment provide an upper damage limit of superconducting magnets due to beam impact. Experimental Setups to Determine the Damage Limit of Superconducting Magnets for Instantaneous Beam Losses, V. Raginel et al, IPAC'15
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMB038
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TUPMR001	Preliminary Test of 1 Mv Electrostatic Accelerator at Komac	ion, ion-source, power-supply, extraction	1222
	D.I. Kim KAERI, Daejon, Republic of Korea Y.-S. Cho, H.-J. Kwon, S.H. Park Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea
	Funding: This work was supported by the Ministry of Education, Science and Technology of the Korean Government. 1 MV electrostatic accelerator is being developed to satisfy the needs from the users, especially for the applications with a MeV range ion beam implantation at KOrea Multi-purpose Accelerator Complex (KOMAC). Typically, the accelerator consists of ion source, beam transport system and target chamber. For the accelerating voltage of a MeV range, ELV type high voltage power supply has been selected. And then, ion source has been selected as the newly developed RF ion source which can be installed inside the pressure vessel of high voltage power supply due to its limited space and electrical power. In this paper, preliminary test of 1 MV electrostatic accelerator including test results in test stand is presented.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR001
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TUPMR005	First Results of a Turbo Generator Test for Powering the HV-Solenoids at a Relativistic Electron Cooler	electron, solenoid, experiment, power-supply	1233
	A. Hofmann, K. Aulenbacher, M.W. Bruker, J. Dietrich, T. Weilbach HIM, Mainz, Germany W. Klag IKP, Mainz, Germany V.V. Parkhomchuk, V.B. Reva BINP SB RAS, Novosibirsk, Russia
	One of the challenges in a relativistic electron cooler is the generation of high voltage exceeding 2 MV and the powering of HV-solenoids, which need a floating power supply. As replacement of the well established, but limited, methods we propose streaming gas for the power transfer. The conversion of the energy by a turbo generator enables using scalable power supply / HV-generator combinations. BINP SB RAS has proposed two possibilities to build the power supply in a modular way. In the first proposal, two cascade transformers per module should be used; the first one powers 22 small HV-solenoids, the second one generates the voltage. In order to reach the final voltage, the modules are cascaded. The cascade transformers are fed by a turbo generator, which is driven by pressurised gas. The second possibility is to use two big HV-solenoids, which are powered directly by a turbo generator. The voltage could be generated for example with a Cockcroft Walton generator. A potential candidate is the Green Energy Turbine (GET) from the company DEPRAG, Germany. At the Helmholtz-Institut Mainz, two GET were tested. In this report, we present our experience and show first results.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR005
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WEPMY026	A Gas-filled Capillary Based Plasma Source for Wakefield Experiments	plasma, vacuum, experiment, simulation	2613
	O. Mete Apsimon, K. Hanahoe, T.H. Pacey, G.X. Xia UMAN, Manchester, United Kingdom
	Funding: This work is supported by the University of Manchester Strategic Grant. A plasma medium can be formed when a gas is discharged via an applied high voltage within a capillary tube. A high voltage discharge based plasma source for plasma wake- field acceleration experiment is being developed. Design considered a glass capillary tube with various inner radii. Glass was preferred to sapphire or quartz options to ease the machining. Electrodes will be attached to the tube using a sealant resistant to high vacuum conditions and baking at high temperatures. Each electrode will be isolated from the neighbouring one using nuts or washers from a thermoplastic polymer insulator material to prevent unwanted sparking outside of the tube. In this paper, general design considerations and possible working points of this plasma source are presented for a range of plasma densities from 1×10²⁰ to 1×10²² m^−3. Consideration was also given to plasma density diagnostic techniques due to critical dependence of accelerating gradient on plasma density.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMY026
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THPMW014	High Voltage Supply for Particle Accelerators Based on Modular Multilevel Converters	operation, power-supply, flattop, controls	3567
	P. Asimakopoulos, K.D. Papastergiou CERN, Geneva, Switzerland
	Modular Multilevel Converters brought a paradigm shift in very high voltage and high power applications with the replacement of high voltage valves by multiple series-connected, low-voltage modules that can be by-passed in case of fault. The reliability and precision in output waveform generation make it a potential candidate in accelerator power conversion. This work demonstrates operation of MMC-based high voltage magnet supply for a transfer line application. The output current regulation precision and the total power losses are examined. Finally, the challenge of the control optimization combined with the passive components dimensioning is highlighted. * R. Marquardt and A. Lesnicar, "An innovative modular multilevel converter topology suitable for a wide power range", in Proc. IEEE Bologna Power Technol. Conf., Jun. 2003, pp. 1-6.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW014
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THPMW020	Solid-state Compact Kicker Pulsar using Strip-line Type Blumlein with SIC-MOSFET in Spring-8	impedance, kicker, operation, storage-ring	3585
	C. Mitsuda, T. Honiden, K. Kobayashi, T. Kobayashi, S. Sasaki JASRI/SPring-8, Hyogo-ken, Japan N. Sekine Sekine Electric Works Co. Ltd, Osaka, Japan
	In the case of handling the electron beam by bunch-by-bunch and turn-by-turn with a kicker at the SPring-8, the performances required to a pulsar are short pulse width (<40ns) and high repetitions (>208kHz). In order to achieve these specifications, the short pulsed high voltage output and the utilization of the solid-state switch is necessary for an inductance load. In order to suppress the supplied voltage as low as as possible, it is an important feature to realize the extremely small-sized pulsar to be set near the kicker. On the basis of the experiences in developing the solid-state pulsar of 400ns/2kV using Si-MOSFET, combination of the SiC-MOSFET and the strip-line type Blumlein pulse forming network (BPFN) was applied to the prototype driver to achieve a shorter pulse and higher power than Si-type driver. The completed pulsar accomplished a compact size (external dimensions; 300(H)x400(W)x400(D)mm). Furthermore, the targeted short-pulsed high voltage output of 123ns/12kV was obtained by 6 BPFNs serial connection to the load inductance of 800 nH. The BPFN detailed design to enable the compact size, high reliability and stability at high repetitions will be reported. C.Mitsuda et al., Proc. of IPAC2013, MOPAWA003
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW020
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THPMW027	Development of a Long Pulse High Power Klystron Modulator for the ESS Linac based on the Stacked Multi-level Topology	klystron, linac, DTL, operation	3600
	C.A. Martins ESS, Lund, Sweden M. Collins, A. Reinap Lund Technical University, Lund, Sweden
	A novel Stacked Multi-Level modulator topology optimized for long pulse and high average power applications has been developed at ESS. It utilizes six identical modules connected in series at the HV output side and fed in parallel from the low voltage side. Each one is formed by one HF inverter, one step-up transformer, one HV rectifier bridge and one HV passive filter. They are supplied in groups of two from three capacitor banks which in turn will be charged from the low voltage electrical grid by using three groups of active AC/DC and DC/DC converters. Industrial standard power electronic components are used at the primary stage, which are placed in conventional electrical cabinets. Only few special components (transformers, rectifiers, filters) are required to be placed in an oil tank. A technology demonstrator rated for 115kV/20A and 3.5ms/14Hz is at the final phase of construction. The main power conversion circuit and regulation principles will be described and details on the design and construction of the main sub-systems will be given. Simulation and experimental results will be given showing the achieved performance in terms of HV pulse quality and AC grid power quality
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW027
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THPMW028	High Voltage Performance of Surface Coatings on Alumina Insulators	kicker, injection, vacuum, impedance	3603
	A. Adraktas, M.J. Barnes, H.A. Day, L. Ducimetière CERN, Geneva, Switzerland
	Alumina insulators and dielectrics are required for a variety of applications in particle accelerators. Their use in high voltage devices, both pulsed and DC, is well established as both insulation and mechanical support. In accelerator equipment the alumina is usually used in ultra-high vacuum and hence charge accumulation can be an issue, especially when the alumina is near to the beam. To address challenges regarding surface flashover and high secondary electron yield in high intensity accelerators, surface treatments and coatings are being considered. This paper presents predictions of the influence of surface coatings, on alumina insulators, upon electric field.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW028
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THPMW037	Pulsed Power Systems for ESS Klystrons	klystron, operation, electronics, cathode	3634
	I. Roth, M.P.J. Gaudreau, M.K. Kempkes Diversified Technologies, Inc., Bedford, Massachusetts, USA J. Domenge Sigma Phi Electronics, Wissembourg, France J.L. Lancelot Sigmaphi, Vannes, France
	Diversified Technologies, Inc. (DTI) is building three long pulse solid-state klystron transmitters to meet spallation source requirements. Two of the three will be installed at CEA Saclay and the National Institute of Nuclear and Particle Physics (IN2P3) in 2015, to be used as test stands for the European Spallation Source (ESS), The third system will be installed at Oak Ridge National Laboratory (ORNL) for the Spallation Neutron Source (SNS).
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW037
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THPMY035	The Real-time Remote Monitoring of Electric Power System Condition at NSRRC	monitoring, real-time, status, operation	3737
	T.-S. Ueng, J.-C. Chang, C.S. Chen, Y.F. Chiu, K.C. Kuo, Y.-C. Lin NSRRC, Hsinchu, Taiwan
	For monitoring effectively the real time status of NSRRC's electric power system, an electric power quality monitoring system has been set up to measure the power quality of high voltage feeders, which includes the voltage/current phase, the variation of frequency, voltage sags and swells. The measured result will be analyzed and used to further improve the performance of power system. Furthermore, a partial discharge monitoring system was also installed to monitor the phenomena of electric discharges. Using the ultra high frequency discharge sensor, the magnitude and the pulse-per-second of discharge are measured and analysed. It allows the electrical engineers to diagnose the degradation of insulation of the electric equipment beforehand to reduce the power failure.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMY035
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THPOW008	DC Photoemission Gun Upgrade at the Compact ERL	gun, operation, FEL, vacuum	3944
	N. Nishimori, R. Hajima, R. Nagai JAEA, Ibaraki-ken, Japan Y. Honda, T. Miyajima, T. Uchiyama, M. Yamamoto KEK, Ibaraki, Japan M. Mori JAEA/Kansai, Kyoto, Japan
	Funding: This work is partially supported by a JSPS Grant-in-Aid for Scientific Research in Japan (15H03594). The DC photoemission gun at the compact ERL (cERL) has stably provided beam for ERL commissioning and laser Compton scattering experiments since April 2013. The operational voltage has however been limited to 390 kV due to failures of two segments out of the ten segmented insulator. In order to recover 500 kV operation, we installed an additional two segmented insulator on the existing ten segmented insulator during summer shutdown in 2015. The details of the gun upgrade and the operational experience of the upgraded cERL gun will be presented.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOW008
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THPOW011	The Measurement System of the Electron Gun with Double-anode Structure	gun, cathode, electron, vacuum	3954
	F.L. Shang, J. Li, L. Shang USTC/NSRL, Hefei, Anhui, People's Republic of China
	Funding: National Natural Science Foundation of China(11175181); National Natural Science Foundation of China(10875116) The double-anode structure with an intermediate electrode has been proposed to overcome the strong space-charge force on the cathode and improve the transverse focusing, which make the goal of high perveance and high compression ratio achieved. This gun plays a key role as the external injecting electron source of the independently-tunable-cells (ITC) RF gun. In order to understand the quality of the beam, a measurement system has been designed. The papers present the measurement system and the result of the test.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOW011
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Paper

Title

Other Keywords

Page

TUPMB007

Research and Development of the Pulse Bump Magnet for the Injection System in CSNS/RCS

injection, neutron, radiation, synchrotron

1118

L. Huo, M.Y. Huang, W. Kang, Y.Q. Liu, J. Qiu, L. Wang, S. Wang
IHEP, Beijing, People's Republic of China

The H⁻ stripping painting injection is adopted in the Rapid Cycling Synchrotron (RCS) of China Spallation Neutron Source (CSNS). Painting injection is realized by eight pulse bump magnets. The pulse bump magnet is the key of the performance of painting, as well as the beam loss control. The manufacture and the field measurement of the eight pulse bump magnets have been completed. In the development of the magnets, some key technical problems on fabrication of coil were solved, and the field measurement results show that the magnets fulfil the design specification.

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TUPMB038

Degradation of the Insulation of the LHC Main Dipole Cable when Exposed to High Temperatures

dipole, superconducting-magnet, operation, laser

1186

V. Raginel, B. Auchmann, D. Kleiven, R. Schmidt, A.P. Verweij, D. Wollmann
CERN, Geneva, Switzerland

Funding: Research supported by the High Luminosity LHC project
The energy stored in the LHC beams is substantial and requires a complex machine protection system to protect the equipment. Despite efficient beam absorbers, several failure modes lead to some limited beam impact on superconducting magnets. Thus it is required to understand the damage mechanisms and limits of superconducting magnets due to instantaneous beam impact. This becomes even more important due to the future upgrade of CERNs injector chain for the LHC that will lead to an increase of the beam brightness. A roadmap to perform damage tests on magnet parts has been presented previously*. The polyimide insulation of the superconducting cable is identified as one of the critical elements of the magnet. In this contribution, the experimental setup to measure the insulation degradation of LHC main dipole cables due to exposure to high temperature is described. Compressed stacks of insulated Nb-Ti cables have been exposed to a heat treatment within an Argon atmosphere. After each heat treatment, high-voltage measurements verified the dielectric strength of the insulation. The results of this experiment provide an upper damage limit of superconducting magnets due to beam impact.
* Experimental Setups to Determine the Damage Limit of Superconducting Magnets for Instantaneous Beam Losses, V. Raginel et al, IPAC'15

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TUPMR001

Preliminary Test of 1 Mv Electrostatic Accelerator at Komac

ion, ion-source, power-supply, extraction

1222

D.I. Kim
KAERI, Daejon, Republic of Korea
Y.-S. Cho, H.-J. Kwon, S.H. Park
Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea

Funding: This work was supported by the Ministry of Education, Science and Technology of the Korean Government.
1 MV electrostatic accelerator is being developed to satisfy the needs from the users, especially for the applications with a MeV range ion beam implantation at KOrea Multi-purpose Accelerator Complex (KOMAC). Typically, the accelerator consists of ion source, beam transport system and target chamber. For the accelerating voltage of a MeV range, ELV type high voltage power supply has been selected. And then, ion source has been selected as the newly developed RF ion source which can be installed inside the pressure vessel of high voltage power supply due to its limited space and electrical power. In this paper, preliminary test of 1 MV electrostatic accelerator including test results in test stand is presented.

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reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR001

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TUPMR005

First Results of a Turbo Generator Test for Powering the HV-Solenoids at a Relativistic Electron Cooler

electron, solenoid, experiment, power-supply

1233

A. Hofmann, K. Aulenbacher, M.W. Bruker, J. Dietrich, T. Weilbach
HIM, Mainz, Germany
W. Klag
IKP, Mainz, Germany
V.V. Parkhomchuk, V.B. Reva
BINP SB RAS, Novosibirsk, Russia

One of the challenges in a relativistic electron cooler is the generation of high voltage exceeding 2 MV and the powering of HV-solenoids, which need a floating power supply. As replacement of the well established, but limited, methods we propose streaming gas for the power transfer. The conversion of the energy by a turbo generator enables using scalable power supply / HV-generator combinations. BINP SB RAS has proposed two possibilities to build the power supply in a modular way. In the first proposal, two cascade transformers per module should be used; the first one powers 22 small HV-solenoids, the second one generates the voltage. In order to reach the final voltage, the modules are cascaded. The cascade transformers are fed by a turbo generator, which is driven by pressurised gas. The second possibility is to use two big HV-solenoids, which are powered directly by a turbo generator. The voltage could be generated for example with a Cockcroft Walton generator. A potential candidate is the Green Energy Turbine (GET) from the company DEPRAG, Germany. At the Helmholtz-Institut Mainz, two GET were tested. In this report, we present our experience and show first results.

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WEPMY026

A Gas-filled Capillary Based Plasma Source for Wakefield Experiments

plasma, vacuum, experiment, simulation

2613

O. Mete Apsimon, K. Hanahoe, T.H. Pacey, G.X. Xia
UMAN, Manchester, United Kingdom

Funding: This work is supported by the University of Manchester Strategic Grant.
A plasma medium can be formed when a gas is discharged via an applied high voltage within a capillary tube. A high voltage discharge based plasma source for plasma wake- field acceleration experiment is being developed. Design considered a glass capillary tube with various inner radii. Glass was preferred to sapphire or quartz options to ease the machining. Electrodes will be attached to the tube using a sealant resistant to high vacuum conditions and baking at high temperatures. Each electrode will be isolated from the neighbouring one using nuts or washers from a thermoplastic polymer insulator material to prevent unwanted sparking outside of the tube. In this paper, general design considerations and possible working points of this plasma source are presented for a range of plasma densities from 1×10²⁰ to 1×10²² m^−3. Consideration was also given to plasma density diagnostic techniques due to critical dependence of accelerating gradient on plasma density.

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THPMW014

High Voltage Supply for Particle Accelerators Based on Modular Multilevel Converters

operation, power-supply, flattop, controls

3567

P. Asimakopoulos, K.D. Papastergiou
CERN, Geneva, Switzerland

Modular Multilevel Converters brought a paradigm shift in very high voltage and high power applications with the replacement of high voltage valves by multiple series-connected, low-voltage modules that can be by-passed in case of fault. The reliability and precision in output waveform generation make it a potential candidate in accelerator power conversion. This work demonstrates operation of MMC-based high voltage magnet supply for a transfer line application. The output current regulation precision and the total power losses are examined. Finally, the challenge of the control optimization combined with the passive components dimensioning is highlighted.
* R. Marquardt and A. Lesnicar, "An innovative modular multilevel converter topology suitable for a wide power range", in Proc. IEEE Bologna Power Technol. Conf., Jun. 2003, pp. 1-6.

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THPMW020

Solid-state Compact Kicker Pulsar using Strip-line Type Blumlein with SIC-MOSFET in Spring-8

impedance, kicker, operation, storage-ring

3585

C. Mitsuda, T. Honiden, K. Kobayashi, T. Kobayashi, S. Sasaki
JASRI/SPring-8, Hyogo-ken, Japan
N. Sekine
Sekine Electric Works Co. Ltd, Osaka, Japan

In the case of handling the electron beam by bunch-by-bunch and turn-by-turn with a kicker at the SPring-8, the performances required to a pulsar are short pulse width (<40ns) and high repetitions (>208kHz). In order to achieve these specifications, the short pulsed high voltage output and the utilization of the solid-state switch is necessary for an inductance load. In order to suppress the supplied voltage as low as as possible, it is an important feature to realize the extremely small-sized pulsar to be set near the kicker. On the basis of the experiences in developing the solid-state pulsar of 400ns/2kV using Si-MOSFET*, combination of the SiC-MOSFET and the strip-line type Blumlein pulse forming network (BPFN) was applied to the prototype driver to achieve a shorter pulse and higher power than Si-type driver. The completed pulsar accomplished a compact size (external dimensions; 300(H)x400(W)x400(D)mm). Furthermore, the targeted short-pulsed high voltage output of 123ns/12kV was obtained by 6 BPFNs serial connection to the load inductance of 800 nH. The BPFN detailed design to enable the compact size, high reliability and stability at high repetitions will be reported.
* C.Mitsuda et al., Proc. of IPAC2013, MOPAWA003

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THPMW027

Development of a Long Pulse High Power Klystron Modulator for the ESS Linac based on the Stacked Multi-level Topology

klystron, linac, DTL, operation

3600

C.A. Martins
ESS, Lund, Sweden
M. Collins, A. Reinap
Lund Technical University, Lund, Sweden

A novel Stacked Multi-Level modulator topology optimized for long pulse and high average power applications has been developed at ESS. It utilizes six identical modules connected in series at the HV output side and fed in parallel from the low voltage side. Each one is formed by one HF inverter, one step-up transformer, one HV rectifier bridge and one HV passive filter. They are supplied in groups of two from three capacitor banks which in turn will be charged from the low voltage electrical grid by using three groups of active AC/DC and DC/DC converters. Industrial standard power electronic components are used at the primary stage, which are placed in conventional electrical cabinets. Only few special components (transformers, rectifiers, filters) are required to be placed in an oil tank. A technology demonstrator rated for 115kV/20A and 3.5ms/14Hz is at the final phase of construction. The main power conversion circuit and regulation principles will be described and details on the design and construction of the main sub-systems will be given. Simulation and experimental results will be given showing the achieved performance in terms of HV pulse quality and AC grid power quality

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THPMW028

High Voltage Performance of Surface Coatings on Alumina Insulators

kicker, injection, vacuum, impedance

3603

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

Alumina insulators and dielectrics are required for a variety of applications in particle accelerators. Their use in high voltage devices, both pulsed and DC, is well established as both insulation and mechanical support. In accelerator equipment the alumina is usually used in ultra-high vacuum and hence charge accumulation can be an issue, especially when the alumina is near to the beam. To address challenges regarding surface flashover and high secondary electron yield in high intensity accelerators, surface treatments and coatings are being considered. This paper presents predictions of the influence of surface coatings, on alumina insulators, upon electric field.

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THPMW037

Pulsed Power Systems for ESS Klystrons

klystron, operation, electronics, cathode

3634

I. Roth, M.P.J. Gaudreau, M.K. Kempkes
Diversified Technologies, Inc., Bedford, Massachusetts, USA
J. Domenge
Sigma Phi Electronics, Wissembourg, France
J.L. Lancelot
Sigmaphi, Vannes, France

Diversified Technologies, Inc. (DTI) is building three long pulse solid-state klystron transmitters to meet spallation source requirements. Two of the three will be installed at CEA Saclay and the National Institute of Nuclear and Particle Physics (IN2P3) in 2015, to be used as test stands for the European Spallation Source (ESS), The third system will be installed at Oak Ridge National Laboratory (ORNL) for the Spallation Neutron Source (SNS).

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THPMY035

The Real-time Remote Monitoring of Electric Power System Condition at NSRRC

monitoring, real-time, status, operation

3737

T.-S. Ueng, J.-C. Chang, C.S. Chen, Y.F. Chiu, K.C. Kuo, Y.-C. Lin
NSRRC, Hsinchu, Taiwan

For monitoring effectively the real time status of NSRRC's electric power system, an electric power quality monitoring system has been set up to measure the power quality of high voltage feeders, which includes the voltage/current phase, the variation of frequency, voltage sags and swells. The measured result will be analyzed and used to further improve the performance of power system. Furthermore, a partial discharge monitoring system was also installed to monitor the phenomena of electric discharges. Using the ultra high frequency discharge sensor, the magnitude and the pulse-per-second of discharge are measured and analysed. It allows the electrical engineers to diagnose the degradation of insulation of the electric equipment beforehand to reduce the power failure.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMY035

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THPOW008

DC Photoemission Gun Upgrade at the Compact ERL

gun, operation, FEL, vacuum

3944

N. Nishimori, R. Hajima, R. Nagai
JAEA, Ibaraki-ken, Japan
Y. Honda, T. Miyajima, T. Uchiyama, M. Yamamoto
KEK, Ibaraki, Japan
M. Mori
JAEA/Kansai, Kyoto, Japan

Funding: This work is partially supported by a JSPS Grant-in-Aid for Scientific Research in Japan (15H03594).
The DC photoemission gun at the compact ERL (cERL) has stably provided beam for ERL commissioning and laser Compton scattering experiments since April 2013. The operational voltage has however been limited to 390 kV due to failures of two segments out of the ten segmented insulator. In order to recover 500 kV operation, we installed an additional two segmented insulator on the existing ten segmented insulator during summer shutdown in 2015. The details of the gun upgrade and the operational experience of the upgraded cERL gun will be presented.

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reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOW008

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THPOW011

The Measurement System of the Electron Gun with Double-anode Structure

gun, cathode, electron, vacuum

3954

F.L. Shang, J. Li, L. Shang
USTC/NSRL, Hefei, Anhui, People's Republic of China

Funding: National Natural Science Foundation of China(11175181); National Natural Science Foundation of China(10875116)
The double-anode structure with an intermediate electrode has been proposed to overcome the strong space-charge force on the cathode and improve the transverse focusing, which make the goal of high perveance and high compression ratio achieved. This gun plays a key role as the external injecting electron source of the independently-tunable-cells (ITC) RF gun. In order to understand the quality of the beam, a measurement system has been designed. The papers present the measurement system and the result of the test.

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reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOW011

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