ECRIS-2014 - Classification: Status reports and new developments

Paper

Title

Page

MOOMMH01

How Can an ECRIS Meet Requirement of the Next Generation Heavy Ion Accelerator Facility

H.W. Zhao, L.T. Sun
IMP, Lanzhou, People's Republic of China

Driven by the requirement of nuclear physics research, a few next generation heavy ion accelerator facilities have been proposed such as GSI-FAIR, IMP-HIAF, JINR-NICA and JLAB-MEIC which require ion source to produce very intense pulsed-highly-charged heavy ion beams such as Au³²⁺,U²⁸⁺ and U³⁵⁺ with beam current 10¹¹ particles per pulse. With more intense higher charge state heavy ion beam produced, the design and building of such a heavy ion accelerator complex will be more cost effective and more compact. This is a big challenge and also an opportunity for ECR ion source development. However, how can an ECR ion source compete with other ion sources such as EBIS, LIS and MEVVA ion sources to meet requirement of the next generation heavy ion accelerator complex? The potential performance of the next generation ECRISs working at the frequency 40~60 GHz and comparison with other possible ion sources will be presented. This paper will have a detailed discussion of the foreseen challenges of the next generation ECRISs and impact on the next generation heavy ion acclerator complex as well.

Slides MOOMMH01 [2.333 MB]

MOOMMH02

First Ion Beams Extracted from a 60 GHz ECR Ion Source Using Polyhelices Technique

T. Lamy, J. Angot, J. Jacob, P. Sole, T. Thuillier
LPSC, Grenoble Cedex, France
M.I. Bakulin
GYCOM Ltd, Nizhny Novgorod, Russia
F. Debray, J.M. Dumas, C. Grandclement, P. Sala, C. Trophime
LNCMI, Grenoble Cedex, France
A.G. Eremeev, I. Izotov, B.Z. Movshevich, V. Skalyga
IAP/RAS, Nizhny Novgorod, Russia

Funding: We acknowledge the support of the LNCMI-CNRS, member of the European Magnetic Field Laboratory (EMFL) and the International Science and Technology Center (project#3965).
The first 18 GHz ECR plasma in an ion source prototype with a magnetic structure using high field magnets techniques was performed in 2012. The particularity of such a prototype is the establishing of a topologically closed ECR zone in a cusp configuration. During the current increase to get a closed 60 GHz zone, a failure appeared at 21000 A in one helix among the four. After the modification of the cooling circuit, the prototype was able to accept up to 26000 A allowing high frequency experiments. In the same time, a 60 GHz - 300 kW pulsed gyrotron has been successfully built and installed in Grenoble by IAP-RAS and Gycom company. The first 60 GHz ECR plasma has been produced in April 2014, the first pulsed beams have been extracted and analyzed. The experimental results obtained will be presented along with the perspectives of such developments.

Slides MOOMMH02 [8.061 MB]

MOOMMH03

First Results At 24 GHz With The Superconducting Source For Ions (SuSI)

1

G. Machicoane, D.G. Cole, D.E. Neben, L. Tobos
NSCL, East Lansing, Michigan, USA
K. Holland, D. Leitner, D. Morris
FRIB, East Lansing, Michigan, USA

The superconducting ECR ion source SuSI at Michigan State University was designed to operate primarily at 18GHz and has demonstrated very good performance at this frequency especially when coupling two klystrons to the plasma [1]. Following a period of training, SuSI has been able to reach the magnetic field needed for operation in the high-B mode at 24 GHz. SuSI has several interesting features. First the axial magnetic profile is defined using 6 solenoids which provide some flexibility to adjust parameters such as field gradient at the resonance, Bminimum or plasma length. Second with a diameter of only 101mm, SuSI plasma chamber has a nominal volume of about 3.5 l. Therefore, power density in excess of 2kW/l could be reach and lead potentially to new insight on the maximum performance achievable with an ECR. In January 2014, a 10 kW 24 GHz Gyrotron obtained from the Russian company GYCOM was commissioned at MSU on a dummy load and then connected to SuSI. We report here on the first measurements done with SuSI at 24 GHz.
* L.T. Sun, J. Brandon, D.G. Cole, M. Doleans, G. Machicoane, D. Morris, T. Ropponen, L. Tobos., ECRIS 2010 (MOCOAK02)

Slides MOOMMH03 [3.591 MB]

MOPPH002

Production Of Metallic Stable Ion Beams For GANIL And SPIRAL2

45

F. Lemagnen, C. Barue, C. Canet, J.L. Flambard, R. Frigot, P. Jardin, L. Maunoury, O. Osmond, J. Piot
GANIL, Caen, France
B.J.P. Gall
IPHC, Strasbourg Cedex 2, France
T. Lamy, P. Sole, T. Thuillier
LPSC, Grenoble Cedex, France
C. Peaucelle
IN2P3 IPNL, Villeurbanne, France

GANIL has been producing many stable beams for nearly 30 years. Constant progress have been obtained in terms of intensity, stability and reliability. The presentation highlights recent results obtained for 50Ti beam production from an organo-metallic compound using the MIVOC (Metallic Ions from Volatile Compounds) method with the ECR4 ion source. The synthesis of this compound has been studied and realized by the IPHC-Strasbourg team from isotopically enriched titanium metal. Preliminary tests using natural titanocene were performed to validate the production method in terms of beam intensity, stability and reliability. Results obtained allowed us to program a physics experiment in September 2013. A 50Ti¹⁰⁺ beam was maintained stable for 300 h with a mean intensity of 20 μA. Q/A=1/3 ion source of SPIRAL 2 facility, whom commissioning will be led by end of 2014, is Phoenix V2 ion source which has been developed by LPSC-Grenoble. Results obtained for nickel (58Ni¹⁹⁺) and calcium (40Ca¹⁶⁺) in collaboration with LPSC Grenoble will be presented in this report.
CNRS - Centre national de la recherche scientifique. 3, rue Michel-Ange
75794 Paris cedex 16 - France
CEA, Commissariat à L'Energie Atomique Bâtiment Le ponant D - 25 rue Leblanc
75015 PARIS

MOPPH003

Transfer of the IFMIF Injector from CEA/Saclay to Rokkasho site in Japan

R. Gobin, D. Bogard, N. Chauvin, P. Girardot, P. Guiho, F. Harrault, D. Loiseau, F. Senée
CEA/DSM/IRFU, France
J.M. Ayala, Y. Okumura
IFMIF/EVEDA, Rokkasho, Japan
A. Kasughai
Japan Atomic Energy Agency (JAEA), International Fusion Energy Research Center (IFERC), Rokkasho, Kamikita, Aomori, Japan

The IFMIF Injector, dedicated to high intensity deuteron beams has been designed, built and tested at CEA/Saclay. After acceptance test completion, the Injector has been fully disassembled and prepared for the 2 month long ship trip between Europe and Japan. Beginning of 2014, the 35 large packages have been opened and the Injector re-installation has been performed in March, April and May. The check-out phase is expected in June followed by the production of the first hydrogen plasma and first proton beam. The deuteron beam commissioning is delayed after final tests of all the Injector elements including high power diagnostics. After a brief summary of the achieved results obtained at Saclay, this article reports the different phases from end of 2012 up to the first beam production at Rokkasho.

MOPPH004

Status Report at the Heidelberg Ion-Beam Therapy (HIT) Ion Sources and the Testbench

49

T.W. Winkelmann, R. Cee, Th. Haberer, B. Naas, A. Peters, J. Schreiner
HIT, Heidelberg, Germany
E. Ritter
DREEBIT GmbH, Dresden, Germany

Since October 2009 more than 2000 patients were treated at HIT. In a 24/7 operation scheme two 14.5 GHz electron cyclotron resonance ion sources are routinely used to produce protons and carbon ions. The integration of a third ion source into the production facility was done in summer 2013 to produce a helium beam. This paper will give a status report of the ion source operating experience and statistics and will summarize the enhancement activities, which were undertaken at an in-house ion source testbench.

MOPPH008

The Latest Results of LAPECR3 Ion Source at IMP

Y. Cao
IMP, Lanzhou, People's Republic of China

A high charge state all permanent Electron Cyclotron Resonance Ion Source (ECRIS) LAPECR3 (Lanzhou All Permanent magnet ECR ion source No.3) has been successfully built at the Institute of Modern Physics (IMP) since 2012. LAPECR3 was designed for the Heavy Ion Medical Machine (HIMM) project. More than 120 eμA of C⁵⁺ ion beam has been extracted from the LAPECR3 ion source using CH4 and C2H2 gas, and the emittance was less than 75 π*mm*mrad when the working gas was C2H2. The corresponding experimental results will be presented in detail in this paper.

Poster MOPPH008 [0.347 MB]

MOPPH010

Development of a 14 GHz High Intensity Proton Source

W.H. Zhang, Y.C. Feng, J.W. Guo, X.X. Li, H.Y. Ma, C. Qian, L.T. Sun, Q. Wu, H.J. Zhang, X.Z. Zhang, Z.M. Zhang, H.W. Zhao
IMP, Lanzhou, People's Republic of China

A high intensity ECR proton source with 14 GHz microwave heating was successfully developed at IMP. The idea of the working mechanism and the structure of the proton source, as well as using 14 GHz microwave heating, were first proposed in the world. The experimental platform was set up and preliminary commissioning was performed. The experimental results indicate that the source can produce a total of 4 mA CW hydrogen beams with microwave power of 200 W and extraction voltage of 40 kV, in which H²⁺ and H³⁺ are included. The successful commissioning of the proton source demonstrates that the proposed mechanism and the structure are feasible.

MOPPH011

Development of Interface and Diagnostic System for ECR Ion Source At KBSI

61

B.S. Lee, S. Choi, J.G. Hong, S.J. Kim, J.W. Ok, J.Y. Park, C.S. Shin, M. Won, J.H. Yoon
Korea Basic Science Institute, Busan, Republic of Korea
J. Bahng
Kyungpook National University, Daegu, Republic of Korea
E.-S. Kim
KNU, Deagu, Republic of Korea

A 28 GHz superconducting ECR (electron cyclotron resonance) ion source was recently developed at KBSI (Korea Basic Science Institute) to produce the high current and high charge state ions. The condition of the ion beam extracted from the ion source should be analyzed by a diagnosis tool after accelerating and focusing process. For this, we developed an ion beam diagnostic system composed of a slit, a wire scanner, a view screen and a faraday cup. The interface of the diagnostic system was designed so as to achieve stable operation of the ECR ion source. The information obtained from the diagnostic system can be used as a reference in studies of the optimum beam conditions needed to adjust the extraction parameters. The details of the diagnostic system and initial test results will be reported.

MOPPH012

Beam Slits and Faraday Cup System for the Measurement of Ion Beam Profile in the 18 GHz ECRIS SMASHI

W.I. Choo, S.O. Jang, H.J. You
NFRI, Daejon, Republic of Korea

A beam slits-Faraday cup (slits-cup) system is newly developed to evaluate the performance and the characteristics of the 18 GHz ECR SMASHI (Superconducting Multi-Application Source of Highly-charged Ions), which has been recently commissioned at national fusion research institute in Korea. The slits-cup system consists of a 2-way beam slits and a high power Faraday cup, so that they can collimate the ion beam and also measure the profile of the ion beam. The Faraday cup features a wide range of beam current (0 to 100 mA) and high beam-power capability (300 W). Also, the Faraday cup is designed to have strong features of low signal noise and free of arcing due to electrical wires not exposed to beam line. As for the 2-way beam slits, the slit positions and gaps are independently controllable. Each position of x- and y- slit could be moved by 60 mm, and the slit gap could be adjusted up to 50 mm. Beam profile was measured by adjusting the slit positions from 0 to 50 mm by maintaining the slit gap (e.g., 5 mm). Here, we describe a detailed design of the slit-cup system, beam profile measurements, and their comparisons with the wire scanner measurement.

MOPPH014

Initial Performance of a Liquid Helium-free Superconducting ECR Ion Source SMASHI at NFRI

H.J. You, W.I. Choo, S.O. Jang
NFRI, Daejon, Republic of Korea

A new liquid helium-free superconducting electron cyclotron resonance ion source (ECRIS) has been successfully installed and initially evaluated at the National Fusion Research Institute (NFRI) in Korea. The source features a flexible high magnetic field (>2 T)*, two-frequency heating, plasma diagnostic ports for extraction region, remotely positional three-electrode extraction system (puller-Einzel lens), and capability to generate a wide range of ion elements from gas to metal** . The source, named SMASHI (Superconducting Multi-Application Source of Highly-charged Ions), will be dedicated for development of advanced high-performance ECRIS and future application of highly charged ions in the area of matter interaction. In this presentation, we describe first operations of SMASHI and their initial results. Beam charge state spectra and their maximum intensities are provided for helium and argon beams.
* H. J. You, et al., Rev. Sci. Instrum. 83, 02A326 (2012).
** H. J. You, et al., Rev. Sci. Instrum. 85, 02A916 (2014).

MOPPH015

Production and Acceleration of Titanium-50 Ion Beam at the U-400 Cyclotron

64

S.L. Bogomolov, A.E. Bondarchenko, I.V. Kalagin, K.I. Kuzmenkov, N. Lebedev, V.Ya. Lebedev, V.N. Loginov, R.E. Vaganov
JINR, Dubna, Moscow Region, Russia
Z. Asfari, H. Faure, M. Filliger, B.J.P. Gall
IPHC, Strasbourg Cedex 2, France

Funding: *Work supported by Russian Foundation for Basic Research under grant number 13-02-12011
The production of Ti-50 ion beam with ECR ion source using MIVOC method is described. The experiments were performed at the test bench with the natural and enriched compounds of titanium (CH3)5C5Ti(CH3)3. The compounds were synthesized in collaboration with IPHC (Strasbourg) group. In the experiments at the test bench the beam currents of Ti⁵⁺ - 80 mkA and Ti¹¹⁺ - 70 mkA were achieved at different settings of the source. After successful tests two 3 weeks runs with Ti-50 beam were performed at the U-400 cyclotron for the experiments on spectroscopy of super heavy elements. The intensity of the injected beam of 50Ti⁵⁺ was about of 50-60 μA, during experiment the source have shown stable operation. The compound consumption rate was determined to be about of 2.4 mg/h, corresponding to 50Ti consumption of 0.52 mg/h.

MOPPH016

Modernization of the mVINIS 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.

MOPPH019

Metallic Beam Development with an ECR Ion Source at Michigan State University (MSU)

79

D.E. Neben, D.G. Cole, D. Leitner, G. Machicoane, L. Tobos
NSCL, East Lansing, Michigan, USA

Funding: Supported by Michigan State University, National Science Foundation: NSF Award Number PHY-1102511
Electron Cyclotron Resonance (ECR) ion sources have been used at MSU to provide metal ion beams to the coupled cyclotron facility (CCF), and in the future, for The Facility for Rare Isotope Beams (FRIB). The challenges of metallic beam production with ECR are in production, efficiency, stability and contamination. Future facilities such as FRIB will add the challenge of intensity. We report development of two rare earth metals and the conversion from the oxidized state into metal. The enriched isotopes of 144 Sm, and 176 Yb are commonly available in the sesquioxide form which is unsuitable for use in our standard ovens. We report here results from the off-line chemical reduction of samarium, and ytterbium oxides into metal. We were able to demonstrate efficiencies of up to 90 % throughout the conversion process. The samples were then run on our ECR ion sources to confirm the products of the reduction. In addition we report the development of cadmium metal by passing vapor though over 3/4 m of heated stainless steel tubing and observed 4.3 euA of Cd 20+ with an average consumption of 1 mg/hr.

TUOMMH01

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

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]

TUOMMH02

ECR Ion Source Developments at INFN-LNS

87

L. Celona, G. Castro, S. Gammino, D. Mascali, L. Neri, G. Torrisi
INFN/LNS, Catania, Italy
G. Ciavola
CNAO Foundation, Milan, Italy
A. Galatà
INFN/LNL, Legnaro (PD), Italy
G. Torrisi
Universitá Mediterranea di Reggio Calabria, Reggio Calabria, Italy

At INFN-LNS, ECRIS development during the ‘90s boosted the K-800 Cyclotron performances: SERSE and CAESAR have then well supported Nuclear Physics research. For the new needs of the laboratory, further improvements are required and here described. Activities recently started aimed to the production of multicharged ion beams and to the production of intense light ion beams. Technological developments led the AISHa source design, now under construction, in order to adapt a high performance ECR ion source to hospital facilities needing multiply charged ion production with high reliability and brightness, easy operations and maintenance. The realization of the 75kV-70mA proton source, called PS-ESS, and of its LEBT for the forthcoming European Spallation Source in Sweden is one of the major engagements of the INFN-LNS. Other activities are ongoing on high charge state and high intensity beam production: a major update is going to be finalized on SERSE cryogenic system; at Vancouver, the VIS source is used for producing multi-mA beams of H²⁺ for a high-current cyclotron; a new flexible plasma trap is under test for fundamental research about innovative plasma heating methods.

Slides TUOMMH02 [11.330 MB]

TUOMMH03

Status Report of SECRAL II Ion Source Development

94

L.T. Sun, M.Z. Guan, Q. Hu, W. Lu, L.Z. Ma, E.M. Mei, D.S. Ni, B.M. Wu, W. Wu, T.J. Yang, Y. Yang, W.H. Zhang, X.Z. Zhang, B. Zhao, H.W. Zhao, S.J. Zheng, L. Zhu
IMP, Lanzhou, People's Republic of China
Y. Yang
University of Chinese Academy of Sciences, Beijing, People's Republic of China

Funding: Work supported by the 100 Talents Program of the CAS (No. Y214160BR0), NSF (contract No. 11221064) and MOST (contract No. 2014CB845500).
For a new injector linac project launched at IMP, a superconducting ECR ion source SECRAL II is now under construction. This ion source is a duplicated one of SECRAL I which is operated routinely for HIRFL facility at the frequency of 18-24 GHz. SECRAL II is designed to be operated at the frequency of 28 GHz, which needs slightly higher radial field at the plasma chamber wall. The fabrication of the cold mass was started at early 2013, and it has been completed in May 2014. The engineering design of the whole superconducting magnet has also been finished and ready for fabrication. After a brief introduction of the recent results obtained with SECRAL I ion source, this paper will present the cold mass test results and the cryogenic system design of SECRAL II magnet. The test bench design will be also discussed.

Slides TUOMMH03 [3.782 MB]

TUOMMH04

An ECR Ion Source with Integrated Sputter Magnetron for Metal Ion Beam Generation and Large Area Implantation

M. Kreller
Dreebit GmbH, Großröhrsdorf, Germany
U. Hartung, T. Kopte, T. Weichsel
Fraunhofer FEP, Dresden, Germany
A. Silze, G.H. Zschornack
DREEBIT GmbH, Dresden, Germany

High current metal ion sources are utilized for surface irradiation and implantation in semiconductor, medical or optical industry as well as in photovoltaics. Therefore, a new ECR ion source (ECRIS) combined with an inverted cylindrical sputter magnetron device for metal atom load of the plasma has been developed to produce high currents of metal ion beams. For the generation of mA currents of metallic ion beams the particle load of the plasma should be in the order of 10¹⁸ particles per second. Double Langmuir probe and optical emission spectroscopy measurements are accomplished to determine the electron density in the plasma. The ion source is part of a new implantation platform which is suitable for the irradiation of a target width of 200 mm to produce homogeneous implantation profiles over the entire surface. This facility is including a dipole magnet to separate the produced metal ions from the process gas ions. Furthermore, an ion scan optic followed by an additional dipole magnet is developed to realize a pseudo broad beam scanning unit for large area implantation. In the presentation we describe the ion beam facility and report on first ion extraction experiments.

Slides TUOMMH04 [18.437 MB]

TUOMMH05

HIISI, New 18 GHz ECRIS for the JYFL Accelerator Laboratory

99

H. A. Koivisto, P. M.T. Heikkinen, T. Kalvas, K. Ranttila, O.A. Tarvainen
JYFL, Jyväskylä, Finland
I. Izotov, V. Skalyga
IAP/RAS, Nizhny Novgorod, Russia
G. Machicoane
NSCL, East Lansing, Michigan, USA
T. Thuillier
LPSC, Grenoble Cedex, France
D. Xie
LBNL, Berkeley, California, USA

At the end of 2013 the Academy of Finland granted an infrastructure funding for the JYFL Accelerator Laboratory in order to increase beam intensities for the international user community. The primary objective is to construct a new high performance ECR ion source, HIISI (Heavy Ion Ion Source Injector), for the K130 cyclotron. Using room temperature magnets the HIISI has been designed to produce about the same magnetic field configuration as the superconducting ECRIS SUSI at NSCL/MSU for 18 GHz operation. An innovative structure will be used to maximize the radial confinement and safety of the permanent magnets. The sextupole magnets are separated and insulated from the plasma chamber providing two advantages: 1) the permanent magnets can be cooled down to -20˚C, which increases especially their coercivity and 2) makes it possible to reach higher radial field at the inner surface of plasma chamber. Comprehensive simulations were performed with microwave power up to 6 kW to analyse and address all the heat loads and temperature distribution on the permanent magnet. In this article the magnetic field design and detailed innovative scheme for sextupole magnet will be presented.

Slides TUOMMH05 [2.150 MB]

WEOMMH01

The Installation of the 28GHz Superconducting ECR Ion Source At KBSI

104

M. Won, S. Choi, J.G. Hong, S.J. Kim, B.S. Lee, J.W. Ok, J.Y. Park, C.S. Shin, J.H. Yoon
Korea Basic Science Institute, Busan, Republic of Korea
J.B. Bhang
Kyungpook National University, Daegu, Republic of Korea

In 2009, a 28 GHz superconducting electron cyclotron resonance (ECR) ion source was developed to produce high currents, diverse heavy ion charge state for the compact heavy ion linear accelerator at KBSI (Korea Basic Science Institute). The aim of this study was to generate a high current, and fast neutrons for interacting a heavy ion with the proton target. The fabrication of the key parts, which are the superconducting magnet system with the liquid helium re-condensed cryostat, the 10 kW high-power microwave considering for optimum operation at the 28 GHz ECR Ion Source, were completed in 2013. The waveguide components were connected with a plasma chamber including a gas supply system. The plasma chamber and ion beam extraction were inserted into the warm bore of superconducting magnet. In this paper, we present the current status of the installation of an ECR ion source and report on the test results for ECR plasma ignition.

Slides WEOMMH01 [5.460 MB]

WEOMMH02

First Commissioning Results of An Evaporative Cooling Magnet ECRIS-LECR4

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

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]

WEOMMH04

Thermal Design of Refridgerated Hexapole 18 GHz ECRIS HIISI

114

T. Kalvas, H. A. Koivisto, K. Ranttila, O.A. Tarvainen
JYFL, Jyväskylä, Finland

A project is underway for constructing a new 18 GHz ECR ion source HIISI at University of Jyväskylä. An innovative plasma chamber structure with grooves at magnetic poles is being studied. This allows large chamber radius at the poles, which is relevant for the performance of the ion source while smaller radius between the poles makes space for chamber water cooling. The hexapole will be refridgerated to sub-zero temperatures to boost the coercivity and the remanence of the permanent magnet material. The hexapole structure is insulated from high temperature solenoid coils and plasma chamber by vacuum. The thermal design of the structure has been made using a thermal diffusion code taking in account radiative, conductive and convective heat transfer processes. The heat flux from plasma has been estimated using electron trajectory simulations with sensitivity analysis on the electron energy distribution. The electron simulations are verified by comparing to experimental data from 14 GHz ECR. The electron and thermodynamic simulation efforts are presented together with an analysis of the H-field vs. coersivity in the permanent magnets.

Slides WEOMMH04 [5.163 MB]