ECRIS-2014 - List of Keywords (extraction)

Paper	Title	Other Keywords	Page
MOOBMH02	Emittance Measurements For RIKEN 28 GHz SC-ECRIS	ion, emittance, ion-source, experiment	10
	Y. Higurashi, T. Nakagawa, J. Ohnishi, K. Ozeki RIKEN Nishina Center, Wako, Japan
	In 2013, the intense beams of highly charged uranium ion (180euA of U³⁵⁺, 230euA of U³³⁺) were extracted from RIKEN SC-ECRIS. Following the success, intense beam of U³⁵⁺ ions was used for the RIBF experiment for 24 days without break. It is obvious that production of high-quality beam (smaller emittacne and good stability etc) is also important for RIKEN radio isotope beam factory (RIBF) project. For this reason, in 2014, we systematically measured the emittance and beam intensity of the highly charged uranium ions under various conditions (magnetic field configuration, extracted beam intensity, beam stability etc) to search the optimum condition. In these experiments, we observed that the emittnce size is strongly dependent on the magnetic field configuration, especially Bext. In this contribution, we present the effect of the various parameters (magnetic field configuration, extracted beam intensity, beam stability etc) of the SC-ECRIS on the beam intensity and emittance. We also discuss its mechanism in detail.
	Slides MOOBMH02 [2.472 MB]

MOOAMH01	Simulation Of The CERN GTS-LHC ECR Ion Source Extraction System With Lead And Argon Ion Beams	ion, simulation, linac, ion-source	23
	V. Toivanen, G. Bellodi, D. Küchler, A.M. Lombardi, R. Scrivens, J.T. Stafford-Haworth CERN, Geneva, Switzerland
	A comprehensive study of beam formation and beam transport has been initiated in order to improve the performance of the CERN heavy ion injector, Linac3. As part of this study, the ion beam extraction system of the CERN GTS-LHC 14.5 GHz Electron Cyclotron Resonance Ion Source (ECRIS) has been modelled with the ion optical code IBSimu. The simulations predict self-consistently the triangular and hollow beam structures which are often observed experimentally with ECRIS ion beams. The model is used to investigate the performance of the current extraction system and provides a basis for possible future improvements. In addition, the extraction simulation provides a more realistic representation of the initial beam properties for the beam transport simulations, which aim to identify the performance bottle necks along the Linac3 low energy beam transport. The results of beam extraction simulations with Pb and Ar ion beams from the GTS-LHC will be presented and compared with experimental observations.
	Slides MOOAMH01 [2.525 MB]

MOPPH006	Direct Injection of Intense Heavy Ion Beams from a High Field ECR Ion Source into an RFQ	rfq, ion, ECR, ion-source	52
	G.O. Rodrigues, D. Kanjilal IUAC, New Delhi, India R. Becker IAP, Frankfurt am Main, Germany R.W. Hamm R&M Technical Enterprises, Pleasanton, California, USA
	Beam intensities achievable from high performance ECR sources for highly charged ions are limited by the high space charge. For high performance ECR sources, the stray magnetic field of the source can provide focusing against the space charge blow-up of the beam in addition to the Direct Plasma Injection Scheme (DPIS) adapted from laser ion sources. A combined extraction/matching system* has been designed for direct injection into a radio frequency quadrupole (RFQ) accelerator, allowing a total beam current of 10 mA for the production of highly charged 238U⁴⁰⁺ (1.33 mA) to be injected at an ion source voltage of 60 kV. In this design, the features of IGUN have been used to take into account the rf-focusing of an RFQ channel (without modulation), the electrostatic field between ion source extraction and the RFQ vanes, the magnetic stray field of the ECR superconducting solenoid, and the defocusing space charge of an ion beam. The RFQ has been designed to suppress neighbouring charge states and to work as a filter for the desired 238U⁴⁰⁺. This reduces the transport problem for the beam line as well as it reduces the emittance for the selected charge state. * R. Becker et al., PROC. EPAC-2004, TUPLT024 ** G.Rodrigues et al., Rev. Sci.Instrum. 85,02A740 (2014)

MOPPH016	Modernization of the mVINIS Ion Source	ion, plasma, injection, ion-source	68
	V. Bekhterev, S.L. Bogomolov, A.A. Efremov, Yu.K. Kostyukhov, N. Lebedev JINR, Dubna, Moscow Region, Russia D. Ciric, A.S. Dobrosavljevic, N. Nešković, I.M. Trajic, V. Vujović, Lj. Vukosavljevic VINCA, Belgrade, Serbia
	The mVINIS ECR ion source was designed and constructed jointly by the team of specialists from FLNR JINR, Dubna and Laboratory of Physics, Vinča Institute, Belgrade. It was commissioned and put in operation in 1998. From that time it was widely used in the field of modification of materials by different kinds of multiply charged ions. Recently we decided to modernize mVINIS in order to improve its operation reliability. Our main goal was to refurbish its major components (vacuum pumps, microwave generator, control system etc.). Besides, we decided to enhance basic construction of the ECR ion source in order to improve the production of multiply charged ion beams from gaseous and solid elements. We changed the shape of the plasma chamber and consequently reconstructed the magnetic structure. Also we improved the construction of the injection chamber. All these improvements resulted in substantial increase of ion beam intensities, especially in the case of high charge state ions.

MOPPH018	A Microwave Ion Source for Pulsed Proton Beam Production at ESS-Bilbao	plasma, proton, solenoid, ion	75
	R. Miracoli, I. Arredondo, D. Belver, I. Bustinduy, J. Corres, P. Echevarria, M. Eguiraun, N. Garmendia, P.J. González, Z. Izaola, L. Muguira, I. Rueda ESS Bilbao, Zamudio, Spain
	Ion Source Hydrogen Positive (ISHP) is a 2.7 GHz microwave discharge installed at ESS Bilbao in Spain. This source will be employed in future application of high proton current in the field of research projects and for industrial processes. ISHP produces over 30 mA of pulsed proton beam by operating at 2.7 GHz. The magnetic field is produced by two independently movable coil pair and the extraction system is composed of a plasma electrode at high voltage platform potential, two ground electrodes, and a negatively biased screening electrode inserted between the ground electrodes. The last three electrodes are contained in the extraction column, and can be moved as a group by stepper motors, to change the distance between the plasma electrode and first ground electrode. Measurements with different extraction system setups will be described to show the improvement of the beam intensity and beam emittance.

TUOMMH01	Improvement of Beam Intensities for Ion Beams with Charge-to-Mass Ratio of 1/3 with Two-Frequency Heating Technique	ion, ECRIS, experiment, plasma	83
	A. Kitagawa NIRS, Chiba-shi, Japan T.F. Fujita, M. Muramatsu National Institute of Radiological Sciences, Chiba, Japan K. Fukushima, N. Sasaki, K. Takahashi, W. Takasugi AEC, Chiba, Japan Y. Kato Osaka University, Graduate School of Engineering, Osaka, Japan
	Facilities of heavy ion radiotherapy use carbon ions due to its better biological dose distributions. The necessary energy is over 400MeV/u. A typical accelerator system consisits of a synchrotron and an injector. ECR ion sources have been developed and utilized to produce C⁴⁺ ions. On the other hand, in order to study basic biological researches with a such facility, there are occasionally requirements to produce other ion species like Ar or Fe. Since the injector design is fixed for the acceleration of ions with a charge-to-mass ratio of about 1/3, the ion source must produce Ar¹³⁺ and Fe¹⁹⁺. As a method to improve highly-charged ion production, the technique to feed multiple microwaves with different frequencies is well-known. Our group studied the improvements when the two frequencies are close together each with a power of more than 1kW using the 18GHz NIRS-HEC ECR ion source installed in the Heavy Ion Medical Accelerator in Chiba (HIMAC. Fe and Ni are interesting for a risk study in space environment. We combined the MIVOC method and the two-frequency heating technique for the production of Fe and Ni. The recent test results will be reported.
	Slides TUOMMH01 [2.651 MB]

WEOMMH02	First Commissioning Results of An Evaporative Cooling Magnet ECRIS-LECR4	ion, ion-source, ECR, rfq	107
	W. Lu, Y.C. Feng, S.Q. Guo, B.H. Ma, H.Y. Ma, L.T. Sun, X.Z. Zhang, H.W. Zhao IMP, Lanzhou, People's Republic of China L. Ruan, B. Xiong IEE, Beijing, People's Republic of China
	LECR4 (Lanzhou ECR ion source No.4) is a room temperature ECR ion source, designed to produce high current, multiple charge state ions for SSC-linac project at IMP. The ion source has been optimized to be operated at 18 GHz. A unique feature of LECR4 is that all its solenoid coils are fully immersed in a special medium and cooled by evaporative cooling technology when excited. At design current, the coils can produce peak mirror fields on axis 2.3 Tesla at injection, 1.3 Tesla at extraction and 0.5 Tesla at minimum-B. The nominal radial magnetic field is 1.1 Tesla at plasma chamber wall, which is produced by a Halbach structure 36-segment hexapole. Recently, the project has made significant progress. In January 2014, the first plasma at 18 GHz was ignited. During the ongoing commissioning phase with a stainless steel chamber, tests with gaseous ion beams have been conducted. Some intense ion beams have been produced with microwave power less than 1.5 kW, such as 1.97 emA of O⁶⁺, 1.7 emA of Ar⁸⁺, 1.07 emA of Ar⁹⁺, 290 euA of Xe²⁰⁺ and so on. In this paper, the design of LECR4 ion source will be presented, and the latest test results will also be given.
	Slides WEOMMH02 [3.543 MB]

WEOMMH03	Development of the Magnetic System for New DECRIS-PM Ion Source	ion, permanent-magnet, injection, cyclotron	111
	A.A. Efremov, V. Bekhterev, S.L. Bogomolov JINR, Dubna, Moscow Region, Russia N.N. Konev ITT-Group, Moscow, Russia
	Super-heavy-element factory is under development at the Flerov Laboratory for Nuclear Reactions, JINR, Dubna. The factory will include DC-280 cyclotron, which will be equipped with two 100 kV high voltage platforms. All-permanent magnet ECRIS will be installed on one of the platforms. The request for the source is a production of medium mass ions with A/q=4-7.5 such as 48Ca⁸⁺. Results of the detailed design of a magnetic structure for DECRIS-PM will be presented.
	Slides WEOMMH03 [1.165 MB]

Paper

Title

Other Keywords

Page

MOOBMH02

Emittance Measurements For RIKEN 28 GHz SC-ECRIS

ion, emittance, ion-source, experiment

10

Y. Higurashi, T. Nakagawa, J. Ohnishi, K. Ozeki
RIKEN Nishina Center, Wako, Japan

In 2013, the intense beams of highly charged uranium ion (180euA of U³⁵⁺, 230euA of U³³⁺) were extracted from RIKEN SC-ECRIS. Following the success, intense beam of U³⁵⁺ ions was used for the RIBF experiment for 24 days without break. It is obvious that production of high-quality beam (smaller emittacne and good stability etc) is also important for RIKEN radio isotope beam factory (RIBF) project. For this reason, in 2014, we systematically measured the emittance and beam intensity of the highly charged uranium ions under various conditions (magnetic field configuration, extracted beam intensity, beam stability etc) to search the optimum condition. In these experiments, we observed that the emittnce size is strongly dependent on the magnetic field configuration, especially Bext. In this contribution, we present the effect of the various parameters (magnetic field configuration, extracted beam intensity, beam stability etc) of the SC-ECRIS on the beam intensity and emittance. We also discuss its mechanism in detail.

Slides MOOBMH02 [2.472 MB]

MOOAMH01

Simulation Of The CERN GTS-LHC ECR Ion Source Extraction System With Lead And Argon Ion Beams

ion, simulation, linac, ion-source

23

V. Toivanen, G. Bellodi, D. Küchler, A.M. Lombardi, R. Scrivens, J.T. Stafford-Haworth
CERN, Geneva, Switzerland

A comprehensive study of beam formation and beam transport has been initiated in order to improve the performance of the CERN heavy ion injector, Linac3. As part of this study, the ion beam extraction system of the CERN GTS-LHC 14.5 GHz Electron Cyclotron Resonance Ion Source (ECRIS) has been modelled with the ion optical code IBSimu. The simulations predict self-consistently the triangular and hollow beam structures which are often observed experimentally with ECRIS ion beams. The model is used to investigate the performance of the current extraction system and provides a basis for possible future improvements. In addition, the extraction simulation provides a more realistic representation of the initial beam properties for the beam transport simulations, which aim to identify the performance bottle necks along the Linac3 low energy beam transport. The results of beam extraction simulations with Pb and Ar ion beams from the GTS-LHC will be presented and compared with experimental observations.

Slides MOOAMH01 [2.525 MB]

MOPPH006

Direct Injection of Intense Heavy Ion Beams from a High Field ECR Ion Source into an RFQ

rfq, ion, ECR, ion-source

52

G.O. Rodrigues, D. Kanjilal
IUAC, New Delhi, India
R. Becker
IAP, Frankfurt am Main, Germany
R.W. Hamm
R&M Technical Enterprises, Pleasanton, California, USA

Beam intensities achievable from high performance ECR sources for highly charged ions are limited by the high space charge. For high performance ECR sources, the stray magnetic field of the source can provide focusing against the space charge blow-up of the beam in addition to the Direct Plasma Injection Scheme (DPIS) adapted from laser ion sources*. A combined extraction/matching system** has been designed for direct injection into a radio frequency quadrupole (RFQ) accelerator, allowing a total beam current of 10 mA for the production of highly charged 238U⁴⁰⁺ (1.33 mA) to be injected at an ion source voltage of 60 kV. In this design, the features of IGUN have been used to take into account the rf-focusing of an RFQ channel (without modulation), the electrostatic field between ion source extraction and the RFQ vanes, the magnetic stray field of the ECR superconducting solenoid, and the defocusing space charge of an ion beam. The RFQ has been designed to suppress neighbouring charge states and to work as a filter for the desired 238U⁴⁰⁺. This reduces the transport problem for the beam line as well as it reduces the emittance for the selected charge state.
* R. Becker et al., PROC. EPAC-2004, TUPLT024
** G.Rodrigues et al., Rev. Sci.Instrum. 85,02A740 (2014)

MOPPH016

Modernization of the mVINIS Ion Source

ion, plasma, injection, ion-source

68

V. Bekhterev, S.L. Bogomolov, A.A. Efremov, Yu.K. Kostyukhov, N. Lebedev
JINR, Dubna, Moscow Region, Russia
D. Ciric, A.S. Dobrosavljevic, N. Nešković, I.M. Trajic, V. Vujović, Lj. Vukosavljevic
VINCA, Belgrade, Serbia

The mVINIS ECR ion source was designed and constructed jointly by the team of specialists from FLNR JINR, Dubna and Laboratory of Physics, Vinča Institute, Belgrade. It was commissioned and put in operation in 1998. From that time it was widely used in the field of modification of materials by different kinds of multiply charged ions. Recently we decided to modernize mVINIS in order to improve its operation reliability. Our main goal was to refurbish its major components (vacuum pumps, microwave generator, control system etc.). Besides, we decided to enhance basic construction of the ECR ion source in order to improve the production of multiply charged ion beams from gaseous and solid elements. We changed the shape of the plasma chamber and consequently reconstructed the magnetic structure. Also we improved the construction of the injection chamber. All these improvements resulted in substantial increase of ion beam intensities, especially in the case of high charge state ions.

MOPPH018

A Microwave Ion Source for Pulsed Proton Beam Production at ESS-Bilbao

plasma, proton, solenoid, ion

75

R. Miracoli, I. Arredondo, D. Belver, I. Bustinduy, J. Corres, P. Echevarria, M. Eguiraun, N. Garmendia, P.J. González, Z. Izaola, L. Muguira, I. Rueda
ESS Bilbao, Zamudio, Spain

Ion Source Hydrogen Positive (ISHP) is a 2.7 GHz microwave discharge installed at ESS Bilbao in Spain. This source will be employed in future application of high proton current in the field of research projects and for industrial processes. ISHP produces over 30 mA of pulsed proton beam by operating at 2.7 GHz. The magnetic field is produced by two independently movable coil pair and the extraction system is composed of a plasma electrode at high voltage platform potential, two ground electrodes, and a negatively biased screening electrode inserted between the ground electrodes. The last three electrodes are contained in the extraction column, and can be moved as a group by stepper motors, to change the distance between the plasma electrode and first ground electrode. Measurements with different extraction system setups will be described to show the improvement of the beam intensity and beam emittance.

TUOMMH01

Improvement of Beam Intensities for Ion Beams with Charge-to-Mass Ratio of 1/3 with Two-Frequency Heating Technique

ion, ECRIS, experiment, plasma

83

A. Kitagawa
NIRS, Chiba-shi, Japan
T.F. Fujita, M. Muramatsu
National Institute of Radiological Sciences, Chiba, Japan
K. Fukushima, N. Sasaki, K. Takahashi, W. Takasugi
AEC, Chiba, Japan
Y. Kato
Osaka University, Graduate School of Engineering, Osaka, Japan

Facilities of heavy ion radiotherapy use carbon ions due to its better biological dose distributions. The necessary energy is over 400MeV/u. A typical accelerator system consisits of a synchrotron and an injector. ECR ion sources have been developed and utilized to produce C⁴⁺ ions. On the other hand, in order to study basic biological researches with a such facility, there are occasionally requirements to produce other ion species like Ar or Fe. Since the injector design is fixed for the acceleration of ions with a charge-to-mass ratio of about 1/3, the ion source must produce Ar¹³⁺ and Fe¹⁹⁺. As a method to improve highly-charged ion production, the technique to feed multiple microwaves with different frequencies is well-known. Our group studied the improvements when the two frequencies are close together each with a power of more than 1kW using the 18GHz NIRS-HEC ECR ion source installed in the Heavy Ion Medical Accelerator in Chiba (HIMAC. Fe and Ni are interesting for a risk study in space environment. We combined the MIVOC method and the two-frequency heating technique for the production of Fe and Ni. The recent test results will be reported.

Slides TUOMMH01 [2.651 MB]

WEOMMH02

First Commissioning Results of An Evaporative Cooling Magnet ECRIS-LECR4

ion, ion-source, ECR, rfq

107

W. Lu, Y.C. Feng, S.Q. Guo, B.H. Ma, H.Y. Ma, L.T. Sun, X.Z. Zhang, H.W. Zhao
IMP, Lanzhou, People's Republic of China
L. Ruan, B. Xiong
IEE, Beijing, People's Republic of China

LECR4 (Lanzhou ECR ion source No.4) is a room temperature ECR ion source, designed to produce high current, multiple charge state ions for SSC-linac project at IMP. The ion source has been optimized to be operated at 18 GHz. A unique feature of LECR4 is that all its solenoid coils are fully immersed in a special medium and cooled by evaporative cooling technology when excited. At design current, the coils can produce peak mirror fields on axis 2.3 Tesla at injection, 1.3 Tesla at extraction and 0.5 Tesla at minimum-B. The nominal radial magnetic field is 1.1 Tesla at plasma chamber wall, which is produced by a Halbach structure 36-segment hexapole. Recently, the project has made significant progress. In January 2014, the first plasma at 18 GHz was ignited. During the ongoing commissioning phase with a stainless steel chamber, tests with gaseous ion beams have been conducted. Some intense ion beams have been produced with microwave power less than 1.5 kW, such as 1.97 emA of O⁶⁺, 1.7 emA of Ar⁸⁺, 1.07 emA of Ar⁹⁺, 290 euA of Xe²⁰⁺ and so on. In this paper, the design of LECR4 ion source will be presented, and the latest test results will also be given.

Slides WEOMMH02 [3.543 MB]

WEOMMH03

Development of the Magnetic System for New DECRIS-PM Ion Source

ion, permanent-magnet, injection, cyclotron

111

A.A. Efremov, V. Bekhterev, S.L. Bogomolov
JINR, Dubna, Moscow Region, Russia
N.N. Konev
ITT-Group, Moscow, Russia

Super-heavy-element factory is under development at the Flerov Laboratory for Nuclear Reactions, JINR, Dubna. The factory will include DC-280 cyclotron, which will be equipped with two 100 kV high voltage platforms. All-permanent magnet ECRIS will be installed on one of the platforms. The request for the source is a production of medium mass ions with A/q=4-7.5 such as 48Ca⁸⁺. Results of the detailed design of a magnetic structure for DECRIS-PM will be presented.

Slides WEOMMH03 [1.165 MB]