ECRIS2020 - List of Keywords (ECRIS)

Paper	Title	Other Keywords	Page
MOXZO01	Status of the 45 GHz MARS-D ECRIS	ECR, plasma, operation, ion-source	17
	D.Z. Xie, J.Y. Benitez, M.K. Covo, A. Hodgkinson, M. Juchno, L. Phair, D.S. Todd, L. Wang LBNL, Berkeley, California, USA
	Funding: This work was supported in part by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under contract number DE-AC02-05CH11231 Development of the MARS-D ECR ion source, a 45 GHz next generation ECRIS using a NbTi MARS-magnet, has been continuously moving forward at LBNL. Recent stress analyses and other key components of the MARS-D ion source have been essentially finalized. This article presents and discusses the status of this new 45 GHz ECR ion source, such as the latest design features and the fabrication plan with funding available in the very near future.
	Slides MOXZO01 [3.661 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-MOXZO01
About •	Received ※ 25 September 2020 — Revised ※ 02 October 2020 — Accepted ※ 01 December 2020 — Issue date ※ 29 November 2021
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MOXZO02	Conceptual Design of Heavy Ion ToF-ERDA Facility Based on Permanent Magnet ECRIS and Variable Frequency RFQ Accelerator	rfq, ECR, LEBT, ion-source	21
	O.A. Tarvainen, D.C. Faircloth, A.P. Letchford STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom J. Julin, T. Kalvas JYFL, Jyväskylä, Finland
	Ion beam analysis is typically based on tandem accelerators and negative ions. The required 5-20 MeV energies for heavy ion time-of-flight elastic recoil detection analysis* (ToF-ERDA) can be achieved with a high charge state ion source and RFQ accelerator. We present a conceptual design of a ToF-ERDA facility based on a permanent magnet ECRIS and variable frequency RFQ accelerating 1-10 pnA of 40Ar⁸⁺, 84Kr¹⁷⁺ and 129Xe²⁴⁺ ions to 4-7, 10^-15 and 13-20 MeV. We present the PM ECRIS requirements focusing on the CUBE-ECRIS** with a quadrupole min-B field topology. Beam dynamics studies demonstrating good transmission of the heavy ion beams from the ion source to the RFQ entrance through the electrostatic low energy beam transport (LEBT) and a permanent magnet dipole are presented. The predicted LEBT transmissions of the CUBE-ECRIS (rectangular extraction slit) and a conventional ECRIS (circular extraction aperture) are compared. The conceptual design of the RFQ is described and the implications of the energy spread on the high energy beam transport are discussed. It is demonstrated that an energy spread below 0.2 % is necessary for appropriate resolution of the heavy ion ToF-ERDA. * J. Julin and T. Sajavaara, Nucl. Instrum. Methods Phys. Res. B 406, Part A, (2017), pp 61-65. ** T. Kalvas, O. Tarvainen, V. Toivanen and H. Koivisto, 2020 JINST 15 P06016.
	Slides MOXZO02 [10.204 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-MOXZO02
About •	Received ※ 25 September 2020 — Revised ※ 28 September 2020 — Accepted ※ 14 December 2020 — Issue date ※ 18 May 2021
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MOZZO01	Production of ⁴⁸Ca and ⁴⁸Ti Ion Beams at the DC-280 Cyclotron	cyclotron, ECR, ion-source, factory	43
	S.L. Bogomolov, A.E. Bondarchenko, A.A. Efremov, K.I. Kuzmenkov, N. Lebedev, V.N. Loginov, V. Mironov, D.K. Pugachev JINR, Dubna, Moscow Region, Russia
	The heaviest known elements (up to ¹¹⁸Og) were synthesized at the U-400 cyclotron (FLNR JINR, Dubna) by using a beam of ⁴⁸Ca ions. During the tests of the DC-280 cyclotron, intense beams of ⁴⁸Ca ions were produced. For the synthesis of the elements 119 and heavier, intense and stable beams of medium-mass elements are required, such as ⁵⁰Ti and ⁵⁴Cr. Before starting the main experiments, we test the production of ⁴⁸Ti ion beam, which is less expensive than 50Ti. The article describes the method, technique, and experimental results on the production of ⁴⁸Ca and ⁴⁸Ti ion beam at the DC-280 cyclotron from the DECRIS-PM ion source.
	Slides MOZZO01 [1.105 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-MOZZO01
About •	Received ※ 24 September 2020 — Revised ※ 28 September 2020 — Accepted ※ 20 May 2021 — Issue date ※ 21 July 2021
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MOZZO03	Stable and Intense ⁴⁸Ca Ion Beam Production With a Microwave Shielded Oven and an Optical Spectrometer as Diagnostic Tool	ECR, plasma, ion-source, shielding	50
	F. Maimone, R.H. Hollinger, R. Lang, J. Mäder, P.T. Patchakui, K. Tinschert GSI, Darmstadt, Germany A. Andreev TEMF, TU Darmstadt, Darmstadt, Germany
	The CAPRICE ECRIS installed at the High Charge Injector (HLI) of GSI produces highly charged ion beams from gaseous and metallic elements. A high demand of metal ions comes from the nuclear physics, material re-search, and Super Heavy Element group (SHE), and the most requested element, besides 50Ti, is 48Ca. When this chemical reactive material is deposited inside the plasma chamber at internal components the stability can be com-promised. Furthermore, it is difficult to find a working point to guarantee a long-term stability as the oven re-sponse time and the reaction of the ECRIS are relatively slow. The monitoring by using an Optical Emission Spectrometer (OES) facilitates immediate reactions when-ever plasma instabilities occur. For this reason, a real-time diagnostic system based on an OES has been in-stalled at the ECRIS at HLI for routine operation during the beam-time 2020. The measured spectra revealed a parasitic oven heating by coupled microwaves often com-promising the ion source performance. Therefore, a tung-sten grid has been installed to shield the oven orifice from the coupled microwaves. The results in terms of 48Ca beam intensity and stability are reported here.
	Slides MOZZO03 [11.434 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-MOZZO03
About •	Received ※ 27 September 2020 — Revised ※ 18 September 2020 — Accepted ※ 08 October 2020 — Issue date ※ 13 October 2020
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TUWZO01	Measurements of Plasma Parameters Near Resonance Zones and Peripheral Regions in ECRIS	ECR, dipole, plasma, electron	60
	W. Kubo, S. Harisaki, Y. Kato, I. Owada, K. Sato, K. Tsuda Osaka University, Graduate School of Engineering, Osaka, Japan
	We have investigated how to produce multicharged ions efficiently. Recently, we have focused on waves propagations in plasma and conducted the Upper-hybrid Resonance (UHR) experiments. [1] We have also conducted experiments heating by the coaxial semi-dipole antenna to enhance the right-hand polarization wave, which contributes to ECR. [2] Multicharged ion beams have been improved using various means, e.g., the increase of the magnetic field and the microwave frequency, the DC biased plate-tuner, mixing low z gases, and the multiplex frequencies heating. However, the microwave launching position has been empirically determined on conventional ECRIS’s. There is still some room for improvement with the respect to more efficient excitation of the wave propagation. In this research, we estimate the wave propagation near the ECR zone, and in the opposite peripheral region beyond it. We measure plasma parameters in those regions by two Langmuir probes inserted into each location at the same time. In near future, we optimize the microwave-launching in the case of the fundamental frequency for ECR and the second frequency for UHR in order to enhance their incidence to the vacuum chamber. [1]Y. Kato et al, AIP Conf. Proc. 2011, 020005 (2018). [2]W. Kubo, et al, RSI, 2020, 91, 023317 (2020).
	Slides TUWZO01 [5.656 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-TUWZO01
About •	Received ※ 24 September 2020 — Revised ※ 01 October 2020 — Accepted ※ 03 December 2020 — Issue date ※ 16 February 2022
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TUWZO03	Production of Metallic Ion Beams with Inductive Heating Oven at Institute of Modern Physics	ECR, ion-source, plasma, operation	65
	W. Lu, Y.C. Feng, J.W. Guo, W. Huang, L.B. Li, L.X. Li, H.Y. Ma, J.D. Ma, C. Qian, L.T. Sun, W.H. Zhang, X.Z. Zhang, H.W. Zhao IMP/CAS, Lanzhou, People’s Republic of China W. Huang, L.T. Sun UCAS, Beijing, People’s Republic of China C. Qian University of Chinese Academy of Sciences, Beijing, People’s Republic of China
	A High-Temperature Oven (HTO) with inductive heating technology has been developed successfully in 2019 at Institute of Modern Physics. This oven features durable operation temperature of >2000’ inside the tantalum susceptor. By careful design the oven structure, material compatibility and thermal stress issues at high temperature has been successfully handled, which enables the production of >400 e’A U³³⁺ with SECRAL-II. With necessary refinement, this type of oven could also be available with room temperature ECR ion sources, like LECR4 and LECR5. Some improvements in structure have been proposed in this year. The design and testing results will be presented in this contribution. W. Lu, L. T. Sun, C. Qian, L. B. Li, J. W. Guo, W. Huang, X. Z. Zhang, and H. W. Zhao, Rev. Sci. Instrum. 90, 113318 (2019);
	Slides TUWZO03 [7.369 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-TUWZO03
About •	Received ※ 28 September 2020 — Revised ※ 30 December 2020 — Accepted ※ 18 May 2021 — Issue date ※ 08 October 2021
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TUYZO01	Advancements in Self-Consistent Modeling of Time- and Space-Dependent Phenomena in ECRIS Plasma	plasma, electron, ECR, cyclotron	78
	A. Pidatella, D. Mascali, B. Mishra, E. Naselli, G. Torrisi INFN/LNS, Catania, Italy A. Galatà INFN/LNL, Legnaro (PD), Italy E. Naselli Catania University, Catania, Italy
	Resonant interaction with microwave radiation in ECRIS plasma leads to a strongly anisotropic electron energy distribution function (EEDF), given as a combination of two to three electron populations, with anisotropy that might trigger kinetic instabilities. At the INFN, further efforts have been paid to improve and update self-consistent 3D numerical codes for plasma electrons kinetics. Progresses have opened several perspectives. It is now possible to derive a space-resolved EEDF, providing local information on electron properties. Also, the code has been updated to provide reaction rates of electromagnetic emissions, including X-ray fluorescence. Estimates of the local ion charge state distribution is potentially possible, and first evaluations are ongoing. Dealing with fast-transient mechanisms, such as electromagnetic emission via the electron-cyclotron MASER instability, the code is now updated for locally evaluating the EEDF anisotropy. We will present the collected results, which we believe to have a relevant impact both on the ECRIS plasma physics and on the INFN’s PANDORA project that plans to use ECR plasmas for fundamental studies in Nuclear and AstroNuclear Physics.
	Slides TUYZO01 [25.158 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-TUYZO01
About •	Received ※ 28 September 2020 — Revised ※ 03 October 2020 — Accepted ※ 21 November 2020 — Issue date ※ 01 December 2020
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TUZZO02	Electron Cyclotron Resonance Ion Source Related Research and Development Work at the Department of Physics, University of Jyväskylä (JYFL)	ECR, plasma, electron, ion-source	98
	H.A. Koivisto, B.S. Bhaskar, A. Ikonen, T. Kalvas, S.T. Kosonen, R.J. Kronholm, M.S.P. Marttinen, O.P.I. Timonen, V. Toivanen JYFL, Jyväskylä, Finland J. Angot, B.S. Bhaskar, T. Thuillier LPSC, Grenoble Cedex, France I. Izotov, V. Skalyga IAP/RAS, Nizhny Novgorod, Russia L. Maunoury GANIL, Caen, France O.A. Tarvainen STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
	Funding: The work has received funding from the Academy of Finland under the Academy of Finland Project funding (No. 315855) and from University Grenoble Alps under EMERGENCE-project. Recent research work of the JYFL ion source team covers multi-diagnostic studies of plasma instabilities, high-resolution plasma optical emission spectroscopy, ion current transient measurements to define the total life-time of a particle in the highly charged plasma. The JYFL team also elaborates the magnetic and technical design of the unconventional ion source named CUBE. The R&D work includes, in addition, the commissioning and operation of the high-performance 18 GHz ECRIS, HIISI. The instability measurements have revealed new information about the parameters affecting the onset of the plasma instabilities and shown that different instability modes exist. The ion-beam transient studies have given information about the cumulative life-time of highly-charged ions convergent with the ion temperatures deduced from the Doppler broadening of emission lines. The CUBE prototype has a minimum-B quadrupole magnetic field topology, similar to ARC-ECRIS, and its all-permanent magnet structure has been optimized for 10 GHz frequency. The CUBE design will be presented along with its commissioning status. The status and operational experience with HIISI will be reported as well.
	Slides TUZZO02 [9.553 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-TUZZO02
About •	Received ※ 28 September 2020 — Revised ※ 09 November 2020 — Accepted ※ 03 December 2020 — Issue date ※ 05 May 2021
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WEWZO02	Precise Identification of Extracted Ion Beam Spectrum Initially Obtained in Synthesising Iron-Endohedral Fullerenes on ECRIS	ECR, ion-source, experiment, resonance	114
	I. Owada, S. Harisaki, Y. Kato, W. Kubo, T. Omori, K. Sato, K. Tsuda Osaka University, Graduate School of Engineering, Osaka, Japan A. Kitagawa, M. Muramatsu QST-NIRS, Chiba, Japan Y. Yoshida Toyo University, Kawagoe-shi, Saitama, Japan
	Electron cyclotron resonance ion source (ECRIS) plasma has been constructed for producing synthesized ion beams in Osaka Univ.[1,2] We hope that it can become a universal source capable of producing ions with wide range mass/charge ration (m/q). We have been trying to produce endohedral fullerenes in the ECRIS. We have conducted initial experiments on production of them only in the second stage of ECRIS. We have been using iron vapor source by induction heating (IH) from the mirror end along to the geometrical axis, and C60 crucible from the side wall, respectively. We succeeded in realizing ECR plasma that fullerene and iron ions coexist on the single stage ECRIS, even by 1kV extraction voltage.[3] By these experimental series, the typical CSD suggests that there is possibility of slight formation of iron fullerenes compounds and iron endohedral fullerenes. We are continuing to investigate the experimental conditions that maximize spectrum corresponding to iron endohedral fullerenes. In this paper we describe preliminary experimental results of synthesizing iron-endohedral fullerene on the ECRIS. Y. Kato, et al., RSI, 2014, 85, 02A950-1-3. Y. Kato, et al., RSI, 2016, 87, 02A710-1-4. **Y. Kato, et.al., IIT2018, IEEE Conf. Publ., 2019, pp.172-175.
	Slides WEWZO02 [1.932 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-WEWZO02
About •	Received ※ 25 September 2020 — Revised ※ 14 October 2020 — Accepted ※ 03 November 2020 — Issue date ※ 12 January 2022
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WEWZO03	High Intensity Vanadium Beam Production to Search for New Super-Heavy Element with Z = 119	ECR, ion-source, experiment, plasma	118
	T. Nagatomo, Y. Higurashi, O. Kamigaito, T. Nakagawa, J. Ohnishi RIKEN Nishina Center, Wako, Japan
	We have begun searching for the new super-heavy element (SHE) with Z=119 at RIKEN Heavy Ion LINAC (RILAC). To overcome the small production cross section of vanadium (V) beam on the curium target, the project requires a very powerful V beam. In order to optimize the beam intensity of V with the charge state of 13+, we have investigated the effects of the amount of V vapor, the power of 18- and 28-GHz microwaves, and the strength of the mirror field. While no significant effect was seen by changing the mirror field Bext from 1.4 T to 1.6 T, the amount of V vapor and the microwave power strongly affected. Based on the correlation between the V-vapor and the microwave power, we obtained a 600-euA V(13+) beam with the V consumption rate of 24 mg/h and the microwave power of 2.9 kW in order to execute about 1-month SHE experiment. Furthermore, because such strong mirror field enhances the transverse beam emittance, it is important to control the emittance with small reduction of the intensity. We have successfully controlled the beam emittance by using three pairs of slits (triplet slits) in LEBT by eliminating the peripheral beam components in both of the x-x’ and y-y’ phase spaces.
	Slides WEWZO03 [2.981 MB]
	Poster WEWZO03 [13.283 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-WEWZO03
About •	Received ※ 28 September 2020 — Revised ※ 29 October 2020 — Accepted ※ 22 January 2021 — Issue date ※ 18 May 2021
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WEWZO05	Beam Profile Measurements of Decelerated Multicharged Xe Ions from ECRIS for Estimating Low Energy Damage on Satellites Components	radiation, experiment, ECR, electron	125
	K. Sato, S. Harisaki, Y. Kato, W. Kubo, K. Okumura, I. Owada, K. Tsuda Osaka University, Graduate School of Engineering, Osaka, Japan
	Electron cyclotron resonance ion source (ECRIS) has been constructed for producing synthesized ion beams in Osaka Univ.,* Xe is used as fuel for ion propulsion engines on artificial satellites. There are problems of accumulated damages at irradiation and sputtering by low energy Xe ion from the engine. It is required to construct experimentally sputtering yield databases of ion beams in the low energy region from several hundred eV to 1keV, since there are not enough data of satellite component materials. Therefore, we are trying to investigate experimentally sputtering yield on materials by irradiating the low energy single species Xeq+ ion beams. However, there is a problem that if the low extraction voltage, the amount of beam currents is not enough to obtain ion beam flux for precise evaluation of sputtering yield data. Thus, we conduct to decelerate Xeq+ ion beams required low energy region after extracting at high voltage, e.g., 10kV. We measured the decelerated beam profile with x and y direction wire probes. As a result, we were able to estimate the dose of ion fluxes. We are going to conduct irradiation experiments on various materials. Y. Kato, et al., RSI, 2014, 85, 02A950-1-3. *Y. Kato, et al., RSI, 2016, 87, 02A710-1-4.
	Slides WEWZO05 [8.964 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-WEWZO05
About •	Received ※ 27 September 2020 — Revised ※ 25 September 2020 — Accepted ※ 29 September 2020 — Issue date ※ 14 July 2022
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WEZZO03	ECR3 Commissioning and Planning for C-14 Ion Beams at the Argonne Tandem Linac Accelerator System	ECR, ion-source, target, experiment	157
	R.H. Scott, R.C. Vondrasek ANL, Lemont, Illinois, USA
	Funding: U.S. Department of Energy, Office of Nuclear Physics, contract No. DE-AC02-06CH11357. The Electron Cyclotron Resonance Ion Source ECR3* has recently been commissioned at the Argonne Tandem Linac Accelerator System (ATLAS) at Argonne National Laboratory. While ECR3 can provide many of the stable ATLAS beams, its other intended purpose is the production of C-14 ion beams which were previously produced by a now-retired negative ion source. This paper will discuss the final installation and commissioning of the ion source as well as the preparations for running C-14. A stable C-13 ethylene gas was used as a surrogate to determine the expected level of N-14 contamination when running C-14 since they are inseparable at ATLAS. We were also able to confirm consumption rates and charge state efficiencies under different C-13 running conditions in order to optimize the upcoming C-14 beam production. *R. H. Scott, C. Dickerson, R. C. Pardo, and R. C. Vondrasek, "A New ECRIS Installation at the Argonne Tandem Linac Accelerator System", doi:10.18429/JACoW-ECRIS2016-WEPP14
	Slides WEZZO03 [0.667 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-WEZZO03
About •	Received ※ 28 September 2020 — Revised ※ 30 September 2020 — Accepted ※ 03 December 2020 — Issue date ※ 19 April 2021
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WEZZO04	Improvement of the Efficiency of the TRIUMF Charge State Booster (CSB)	extraction, booster, ECR, simulation	160
	J.A. Adegun, F. Ames, O.K. Kester TRIUMF, Vancouver, Canada
	Funding: TRIUMF, Vancouver, BC Canada 4004 Wesbrook Mall, Vancouver BC V6T2A3, Canada The Electron Cyclotron Resonance Ion Source (ECRIS) is a versatile and reliable ion source to charge-breed rare isotopes at the TRIUMF’s Isotopes Separation and Acceleration (ISAC) facility. Significant research work has been done by different groups worldwide to improve the efficiency and performance of the ECRIS. The most recent result of these activities is the implementation of the two-frequency plasma heating. At the ISAC facility of TRIUMF, a 14.5 GHz PHOENIX booster which has been in operation since 2010 was recently upgraded to accommodate the two-frequency heating system using a single waveguide to improve its charge breeding efficiency. Besides, a program has been launched to improve and optimize the extraction of charge bred isotopes in terms of beam emittance. A detailed investigation of the effect of the two-frequency heating technique on the intensity, emittance, and the efficiency of the extracted beam is presently being conducted and the status will be presented.
	Slides WEZZO04 [0.978 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-WEZZO04
About •	Received ※ 25 September 2020 — Revised ※ 29 September 2020 — Accepted ※ 17 December 2020 — Issue date ※ 04 February 2021
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WEZZO10	Electron Cyclotron Emission Imaging of Electron Cyclotron Resonance Ion Source Plasmas	plasma, electron, ECR, cyclotron	164
	L.E. Henderson, H.L. Clark, C.A. Gagliardi Texas A&M University, Cyclotron Institute, College Station, Texas, USA D.P. May Texas A&M University Cyclotron Institute, College Station, Texas, USA
	A new imaging system for Electron Cyclotron Resonance Ion Sources (ECRIS) has been designed and is being built. This K- and Ka-band camera will extract localized measurements of absolute energy and relative number density for ECRIS plasma electrons by imaging their Electron Cyclotron Emission (ECE) spectra, as the frequency, shape, and strength of the ECE harmonics correlate directly with the local magnetic field, electron energy, and plasma density. The design of the overall quasi-optical system will be presented, including novel ceramic optics for the radial viewports of the Cyclotron Institute’s ECRIS and metamaterial mirrors with electronically controllable reflectivity. Spatial resolution sufficient to distinguish important plasma regions and temporal resolution sufficient to study dynamic plasma processes is expected.
	Slides WEZZO10 [10.583 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-WEZZO10
About •	Received ※ 28 September 2020 — Revised ※ 07 October 2020 — Accepted ※ 15 October 2020 — Issue date ※ 16 November 2020
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Paper

Title

Other Keywords

Page

MOXZO01

Status of the 45 GHz MARS-D ECRIS

ECR, plasma, operation, ion-source

17

D.Z. Xie, J.Y. Benitez, M.K. Covo, A. Hodgkinson, M. Juchno, L. Phair, D.S. Todd, L. Wang
LBNL, Berkeley, California, USA

Funding: This work was supported in part by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under contract number DE-AC02-05CH11231
Development of the MARS-D ECR ion source, a 45 GHz next generation ECRIS using a NbTi MARS-magnet, has been continuously moving forward at LBNL. Recent stress analyses and other key components of the MARS-D ion source have been essentially finalized. This article presents and discusses the status of this new 45 GHz ECR ion source, such as the latest design features and the fabrication plan with funding available in the very near future.

Slides MOXZO01 [3.661 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-MOXZO01

About •

Received ※ 25 September 2020 — Revised ※ 02 October 2020 — Accepted ※ 01 December 2020 — Issue date ※ 29 November 2021

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

MOXZO02

Conceptual Design of Heavy Ion ToF-ERDA Facility Based on Permanent Magnet ECRIS and Variable Frequency RFQ Accelerator

rfq, ECR, LEBT, ion-source

21

O.A. Tarvainen, D.C. Faircloth, A.P. Letchford
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
J. Julin, T. Kalvas
JYFL, Jyväskylä, Finland

Ion beam analysis is typically based on tandem accelerators and negative ions. The required 5-20 MeV energies for heavy ion time-of-flight elastic recoil detection analysis* (ToF-ERDA) can be achieved with a high charge state ion source and RFQ accelerator. We present a conceptual design of a ToF-ERDA facility based on a permanent magnet ECRIS and variable frequency RFQ accelerating 1-10 pnA of 40Ar⁸⁺, 84Kr¹⁷⁺ and 129Xe²⁴⁺ ions to 4-7, 10^-15 and 13-20 MeV. We present the PM ECRIS requirements focusing on the CUBE-ECRIS** with a quadrupole min-B field topology. Beam dynamics studies demonstrating good transmission of the heavy ion beams from the ion source to the RFQ entrance through the electrostatic low energy beam transport (LEBT) and a permanent magnet dipole are presented. The predicted LEBT transmissions of the CUBE-ECRIS (rectangular extraction slit) and a conventional ECRIS (circular extraction aperture) are compared. The conceptual design of the RFQ is described and the implications of the energy spread on the high energy beam transport are discussed. It is demonstrated that an energy spread below 0.2 % is necessary for appropriate resolution of the heavy ion ToF-ERDA.
* J. Julin and T. Sajavaara, Nucl. Instrum. Methods Phys. Res. B 406, Part A, (2017), pp 61-65.
** T. Kalvas, O. Tarvainen, V. Toivanen and H. Koivisto, 2020 JINST 15 P06016.

Slides MOXZO02 [10.204 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-MOXZO02

About •

Received ※ 25 September 2020 — Revised ※ 28 September 2020 — Accepted ※ 14 December 2020 — Issue date ※ 18 May 2021

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

MOZZO01

Production of ⁴⁸Ca and ⁴⁸Ti Ion Beams at the DC-280 Cyclotron

cyclotron, ECR, ion-source, factory

43

S.L. Bogomolov, A.E. Bondarchenko, A.A. Efremov, K.I. Kuzmenkov, N. Lebedev, V.N. Loginov, V. Mironov, D.K. Pugachev
JINR, Dubna, Moscow Region, Russia

The heaviest known elements (up to ¹¹⁸Og) were synthesized at the U-400 cyclotron (FLNR JINR, Dubna) by using a beam of ⁴⁸Ca ions. During the tests of the DC-280 cyclotron, intense beams of ⁴⁸Ca ions were produced. For the synthesis of the elements 119 and heavier, intense and stable beams of medium-mass elements are required, such as ⁵⁰Ti and ⁵⁴Cr. Before starting the main experiments, we test the production of ⁴⁸Ti ion beam, which is less expensive than 50Ti. The article describes the method, technique, and experimental results on the production of ⁴⁸Ca and ⁴⁸Ti ion beam at the DC-280 cyclotron from the DECRIS-PM ion source.

Slides MOZZO01 [1.105 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-MOZZO01

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Received ※ 24 September 2020 — Revised ※ 28 September 2020 — Accepted ※ 20 May 2021 — Issue date ※ 21 July 2021

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MOZZO03

Stable and Intense ⁴⁸Ca Ion Beam Production With a Microwave Shielded Oven and an Optical Spectrometer as Diagnostic Tool

ECR, plasma, ion-source, shielding

50

F. Maimone, R.H. Hollinger, R. Lang, J. Mäder, P.T. Patchakui, K. Tinschert
GSI, Darmstadt, Germany
A. Andreev
TEMF, TU Darmstadt, Darmstadt, Germany

The CAPRICE ECRIS installed at the High Charge Injector (HLI) of GSI produces highly charged ion beams from gaseous and metallic elements. A high demand of metal ions comes from the nuclear physics, material re-search, and Super Heavy Element group (SHE), and the most requested element, besides 50Ti, is 48Ca. When this chemical reactive material is deposited inside the plasma chamber at internal components the stability can be com-promised. Furthermore, it is difficult to find a working point to guarantee a long-term stability as the oven re-sponse time and the reaction of the ECRIS are relatively slow. The monitoring by using an Optical Emission Spectrometer (OES) facilitates immediate reactions when-ever plasma instabilities occur. For this reason, a real-time diagnostic system based on an OES has been in-stalled at the ECRIS at HLI for routine operation during the beam-time 2020. The measured spectra revealed a parasitic oven heating by coupled microwaves often com-promising the ion source performance. Therefore, a tung-sten grid has been installed to shield the oven orifice from the coupled microwaves. The results in terms of 48Ca beam intensity and stability are reported here.

Slides MOZZO03 [11.434 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-MOZZO03

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Received ※ 27 September 2020 — Revised ※ 18 September 2020 — Accepted ※ 08 October 2020 — Issue date ※ 13 October 2020

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TUWZO01

Measurements of Plasma Parameters Near Resonance Zones and Peripheral Regions in ECRIS

ECR, dipole, plasma, electron

60

W. Kubo, S. Harisaki, Y. Kato, I. Owada, K. Sato, K. Tsuda
Osaka University, Graduate School of Engineering, Osaka, Japan

We have investigated how to produce multicharged ions efficiently. Recently, we have focused on waves propagations in plasma and conducted the Upper-hybrid Resonance (UHR) experiments. [1] We have also conducted experiments heating by the coaxial semi-dipole antenna to enhance the right-hand polarization wave, which contributes to ECR. [2] Multicharged ion beams have been improved using various means, e.g., the increase of the magnetic field and the microwave frequency, the DC biased plate-tuner, mixing low z gases, and the multiplex frequencies heating. However, the microwave launching position has been empirically determined on conventional ECRIS’s. There is still some room for improvement with the respect to more efficient excitation of the wave propagation. In this research, we estimate the wave propagation near the ECR zone, and in the opposite peripheral region beyond it. We measure plasma parameters in those regions by two Langmuir probes inserted into each location at the same time. In near future, we optimize the microwave-launching in the case of the fundamental frequency for ECR and the second frequency for UHR in order to enhance their incidence to the vacuum chamber.
[1]Y. Kato et al, AIP Conf. Proc. 2011, 020005 (2018).
[2]W. Kubo, et al, RSI, 2020, 91, 023317 (2020).

Slides TUWZO01 [5.656 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-TUWZO01

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Received ※ 24 September 2020 — Revised ※ 01 October 2020 — Accepted ※ 03 December 2020 — Issue date ※ 16 February 2022

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TUWZO03

Production of Metallic Ion Beams with Inductive Heating Oven at Institute of Modern Physics

ECR, ion-source, plasma, operation

65

W. Lu, Y.C. Feng, J.W. Guo, W. Huang, L.B. Li, L.X. Li, H.Y. Ma, J.D. Ma, C. Qian, L.T. Sun, W.H. Zhang, X.Z. Zhang, H.W. Zhao
IMP/CAS, Lanzhou, People’s Republic of China
W. Huang, L.T. Sun
UCAS, Beijing, People’s Republic of China
C. Qian
University of Chinese Academy of Sciences, Beijing, People’s Republic of China

A High-Temperature Oven (HTO) with inductive heating technology has been developed successfully in 2019 at Institute of Modern Physics. This oven features durable operation temperature of >2000’ inside the tantalum susceptor. By careful design the oven structure, material compatibility and thermal stress issues at high temperature has been successfully handled, which enables the production of >400 e’A U³³⁺ with SECRAL-II*. With necessary refinement, this type of oven could also be available with room temperature ECR ion sources, like LECR4 and LECR5. Some improvements in structure have been proposed in this year. The design and testing results will be presented in this contribution.
*W. Lu, L. T. Sun, C. Qian, L. B. Li, J. W. Guo, W. Huang, X. Z. Zhang, and H. W. Zhao, Rev. Sci. Instrum. 90, 113318 (2019);

Slides TUWZO03 [7.369 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-TUWZO03

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Received ※ 28 September 2020 — Revised ※ 30 December 2020 — Accepted ※ 18 May 2021 — Issue date ※ 08 October 2021

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TUYZO01

Advancements in Self-Consistent Modeling of Time- and Space-Dependent Phenomena in ECRIS Plasma

plasma, electron, ECR, cyclotron

78

A. Pidatella, D. Mascali, B. Mishra, E. Naselli, G. Torrisi
INFN/LNS, Catania, Italy
A. Galatà
INFN/LNL, Legnaro (PD), Italy
E. Naselli
Catania University, Catania, Italy

Resonant interaction with microwave radiation in ECRIS plasma leads to a strongly anisotropic electron energy distribution function (EEDF), given as a combination of two to three electron populations, with anisotropy that might trigger kinetic instabilities. At the INFN, further efforts have been paid to improve and update self-consistent 3D numerical codes for plasma electrons kinetics. Progresses have opened several perspectives. It is now possible to derive a space-resolved EEDF, providing local information on electron properties. Also, the code has been updated to provide reaction rates of electromagnetic emissions, including X-ray fluorescence. Estimates of the local ion charge state distribution is potentially possible, and first evaluations are ongoing. Dealing with fast-transient mechanisms, such as electromagnetic emission via the electron-cyclotron MASER instability, the code is now updated for locally evaluating the EEDF anisotropy. We will present the collected results, which we believe to have a relevant impact both on the ECRIS plasma physics and on the INFN’s PANDORA project that plans to use ECR plasmas for fundamental studies in Nuclear and AstroNuclear Physics.

Slides TUYZO01 [25.158 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-TUYZO01

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Received ※ 28 September 2020 — Revised ※ 03 October 2020 — Accepted ※ 21 November 2020 — Issue date ※ 01 December 2020

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TUZZO02

Electron Cyclotron Resonance Ion Source Related Research and Development Work at the Department of Physics, University of Jyväskylä (JYFL)

ECR, plasma, electron, ion-source

98

H.A. Koivisto, B.S. Bhaskar, A. Ikonen, T. Kalvas, S.T. Kosonen, R.J. Kronholm, M.S.P. Marttinen, O.P.I. Timonen, V. Toivanen
JYFL, Jyväskylä, Finland
J. Angot, B.S. Bhaskar, T. Thuillier
LPSC, Grenoble Cedex, France
I. Izotov, V. Skalyga
IAP/RAS, Nizhny Novgorod, Russia
L. Maunoury
GANIL, Caen, France
O.A. Tarvainen
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom

Funding: The work has received funding from the Academy of Finland under the Academy of Finland Project funding (No. 315855) and from University Grenoble Alps under EMERGENCE-project.
Recent research work of the JYFL ion source team covers multi-diagnostic studies of plasma instabilities, high-resolution plasma optical emission spectroscopy, ion current transient measurements to define the total life-time of a particle in the highly charged plasma. The JYFL team also elaborates the magnetic and technical design of the unconventional ion source named CUBE. The R&D work includes, in addition, the commissioning and operation of the high-performance 18 GHz ECRIS, HIISI. The instability measurements have revealed new information about the parameters affecting the onset of the plasma instabilities and shown that different instability modes exist. The ion-beam transient studies have given information about the cumulative life-time of highly-charged ions convergent with the ion temperatures deduced from the Doppler broadening of emission lines. The CUBE prototype has a minimum-B quadrupole magnetic field topology, similar to ARC-ECRIS, and its all-permanent magnet structure has been optimized for 10 GHz frequency. The CUBE design will be presented along with its commissioning status. The status and operational experience with HIISI will be reported as well.

Slides TUZZO02 [9.553 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-TUZZO02

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Received ※ 28 September 2020 — Revised ※ 09 November 2020 — Accepted ※ 03 December 2020 — Issue date ※ 05 May 2021

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WEWZO02

Precise Identification of Extracted Ion Beam Spectrum Initially Obtained in Synthesising Iron-Endohedral Fullerenes on ECRIS

ECR, ion-source, experiment, resonance

114

I. Owada, S. Harisaki, Y. Kato, W. Kubo, T. Omori, K. Sato, K. Tsuda
Osaka University, Graduate School of Engineering, Osaka, Japan
A. Kitagawa, M. Muramatsu
QST-NIRS, Chiba, Japan
Y. Yoshida
Toyo University, Kawagoe-shi, Saitama, Japan

Electron cyclotron resonance ion source (ECRIS) plasma has been constructed for producing synthesized ion beams in Osaka Univ.[1,2] We hope that it can become a universal source capable of producing ions with wide range mass/charge ration (m/q). We have been trying to produce endohedral fullerenes in the ECRIS. We have conducted initial experiments on production of them only in the second stage of ECRIS. We have been using iron vapor source by induction heating (IH) from the mirror end along to the geometrical axis, and C60 crucible from the side wall, respectively. We succeeded in realizing ECR plasma that fullerene and iron ions coexist on the single stage ECRIS, even by 1kV extraction voltage.[3] By these experimental series, the typical CSD suggests that there is possibility of slight formation of iron fullerenes compounds and iron endohedral fullerenes. We are continuing to investigate the experimental conditions that maximize spectrum corresponding to iron endohedral fullerenes. In this paper we describe preliminary experimental results of synthesizing iron-endohedral fullerene on the ECRIS.
*Y. Kato, et al., RSI, 2014, 85, 02A950-1-3.
**Y. Kato, et al., RSI, 2016, 87, 02A710-1-4.
***Y. Kato, et.al., IIT2018, IEEE Conf. Publ., 2019, pp.172-175.

Slides WEWZO02 [1.932 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-WEWZO02

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Received ※ 25 September 2020 — Revised ※ 14 October 2020 — Accepted ※ 03 November 2020 — Issue date ※ 12 January 2022

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WEWZO03

High Intensity Vanadium Beam Production to Search for New Super-Heavy Element with Z = 119

ECR, ion-source, experiment, plasma

118

T. Nagatomo, Y. Higurashi, O. Kamigaito, T. Nakagawa, J. Ohnishi
RIKEN Nishina Center, Wako, Japan

We have begun searching for the new super-heavy element (SHE) with Z=119 at RIKEN Heavy Ion LINAC (RILAC). To overcome the small production cross section of vanadium (V) beam on the curium target, the project requires a very powerful V beam. In order to optimize the beam intensity of V with the charge state of 13+, we have investigated the effects of the amount of V vapor, the power of 18- and 28-GHz microwaves, and the strength of the mirror field. While no significant effect was seen by changing the mirror field Bext from 1.4 T to 1.6 T, the amount of V vapor and the microwave power strongly affected. Based on the correlation between the V-vapor and the microwave power, we obtained a 600-euA V(13+) beam with the V consumption rate of 24 mg/h and the microwave power of 2.9 kW in order to execute about 1-month SHE experiment. Furthermore, because such strong mirror field enhances the transverse beam emittance, it is important to control the emittance with small reduction of the intensity. We have successfully controlled the beam emittance by using three pairs of slits (triplet slits) in LEBT by eliminating the peripheral beam components in both of the x-x’ and y-y’ phase spaces.

Slides WEWZO03 [2.981 MB]

Poster WEWZO03 [13.283 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-WEWZO03

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Received ※ 28 September 2020 — Revised ※ 29 October 2020 — Accepted ※ 22 January 2021 — Issue date ※ 18 May 2021

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WEWZO05

Beam Profile Measurements of Decelerated Multicharged Xe Ions from ECRIS for Estimating Low Energy Damage on Satellites Components

radiation, experiment, ECR, electron

125

K. Sato, S. Harisaki, Y. Kato, W. Kubo, K. Okumura, I. Owada, K. Tsuda
Osaka University, Graduate School of Engineering, Osaka, Japan

Electron cyclotron resonance ion source (ECRIS) has been constructed for producing synthesized ion beams in Osaka Univ.*,** Xe is used as fuel for ion propulsion engines on artificial satellites. There are problems of accumulated damages at irradiation and sputtering by low energy Xe ion from the engine. It is required to construct experimentally sputtering yield databases of ion beams in the low energy region from several hundred eV to 1keV, since there are not enough data of satellite component materials. Therefore, we are trying to investigate experimentally sputtering yield on materials by irradiating the low energy single species Xeq+ ion beams. However, there is a problem that if the low extraction voltage, the amount of beam currents is not enough to obtain ion beam flux for precise evaluation of sputtering yield data. Thus, we conduct to decelerate Xeq+ ion beams required low energy region after extracting at high voltage, e.g., 10kV. We measured the decelerated beam profile with x and y direction wire probes. As a result, we were able to estimate the dose of ion fluxes. We are going to conduct irradiation experiments on various materials.
*Y. Kato, et al., RSI, 2014, 85, 02A950-1-3.
**Y. Kato, et al., RSI, 2016, 87, 02A710-1-4.

Slides WEWZO05 [8.964 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-WEWZO05

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Received ※ 27 September 2020 — Revised ※ 25 September 2020 — Accepted ※ 29 September 2020 — Issue date ※ 14 July 2022

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WEZZO03

ECR3 Commissioning and Planning for C-14 Ion Beams at the Argonne Tandem Linac Accelerator System

ECR, ion-source, target, experiment

157

R.H. Scott, R.C. Vondrasek
ANL, Lemont, Illinois, USA

Funding: U.S. Department of Energy, Office of Nuclear Physics, contract No. DE-AC02-06CH11357.
The Electron Cyclotron Resonance Ion Source ECR3* has recently been commissioned at the Argonne Tandem Linac Accelerator System (ATLAS) at Argonne National Laboratory. While ECR3 can provide many of the stable ATLAS beams, its other intended purpose is the production of C-14 ion beams which were previously produced by a now-retired negative ion source. This paper will discuss the final installation and commissioning of the ion source as well as the preparations for running C-14. A stable C-13 ethylene gas was used as a surrogate to determine the expected level of N-14 contamination when running C-14 since they are inseparable at ATLAS. We were also able to confirm consumption rates and charge state efficiencies under different C-13 running conditions in order to optimize the upcoming C-14 beam production.
*R. H. Scott, C. Dickerson, R. C. Pardo, and R. C. Vondrasek, "A New ECRIS Installation at the Argonne Tandem Linac Accelerator System", doi:10.18429/JACoW-ECRIS2016-WEPP14

Slides WEZZO03 [0.667 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-WEZZO03

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Received ※ 28 September 2020 — Revised ※ 30 September 2020 — Accepted ※ 03 December 2020 — Issue date ※ 19 April 2021

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WEZZO04

Improvement of the Efficiency of the TRIUMF Charge State Booster (CSB)

extraction, booster, ECR, simulation

160

J.A. Adegun, F. Ames, O.K. Kester
TRIUMF, Vancouver, Canada

Funding: TRIUMF, Vancouver, BC Canada 4004 Wesbrook Mall, Vancouver BC V6T2A3, Canada
The Electron Cyclotron Resonance Ion Source (ECRIS) is a versatile and reliable ion source to charge-breed rare isotopes at the TRIUMF’s Isotopes Separation and Acceleration (ISAC) facility. Significant research work has been done by different groups worldwide to improve the efficiency and performance of the ECRIS. The most recent result of these activities is the implementation of the two-frequency plasma heating. At the ISAC facility of TRIUMF, a 14.5 GHz PHOENIX booster which has been in operation since 2010 was recently upgraded to accommodate the two-frequency heating system using a single waveguide to improve its charge breeding efficiency. Besides, a program has been launched to improve and optimize the extraction of charge bred isotopes in terms of beam emittance. A detailed investigation of the effect of the two-frequency heating technique on the intensity, emittance, and the efficiency of the extracted beam is presently being conducted and the status will be presented.

Slides WEZZO04 [0.978 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-WEZZO04

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Received ※ 25 September 2020 — Revised ※ 29 September 2020 — Accepted ※ 17 December 2020 — Issue date ※ 04 February 2021

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WEZZO10

Electron Cyclotron Emission Imaging of Electron Cyclotron Resonance Ion Source Plasmas

plasma, electron, ECR, cyclotron

164

L.E. Henderson, H.L. Clark, C.A. Gagliardi
Texas A&M University, Cyclotron Institute, College Station, Texas, USA
D.P. May
Texas A&M University Cyclotron Institute, College Station, Texas, USA

A new imaging system for Electron Cyclotron Resonance Ion Sources (ECRIS) has been designed and is being built. This K- and Ka-band camera will extract localized measurements of absolute energy and relative number density for ECRIS plasma electrons by imaging their Electron Cyclotron Emission (ECE) spectra, as the frequency, shape, and strength of the ECE harmonics correlate directly with the local magnetic field, electron energy, and plasma density. The design of the overall quasi-optical system will be presented, including novel ceramic optics for the radial viewports of the Cyclotron Institute’s ECRIS and metamaterial mirrors with electronically controllable reflectivity. Spatial resolution sufficient to distinguish important plasma regions and temporal resolution sufficient to study dynamic plasma processes is expected.

Slides WEZZO10 [10.583 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-WEZZO10

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Received ※ 28 September 2020 — Revised ※ 07 October 2020 — Accepted ※ 15 October 2020 — Issue date ※ 16 November 2020

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