ECRIS2020 - List of Keywords (extraction)

Paper	Title	Other Keywords	Page
MOWZO04	GISMO Gasdynamic ECR Ion Source Status: Towards High-Intensity Ion Beams of Superior Quality	plasma, ion-source, ECR, neutron	13
	I. Izotov, A. Bokhanov, E.M. Kiseleva, R.L. Lapin, V. Skalyga, S.S. Vybin IAP/RAS, Nizhny Novgorod, Russia
	Funding: The work was supported by RFBR, grant #20-32-70002, and within the state assignment of the Ministry of Science and Higher Education of the Russian Federation No. 0035-2019-0002. GISMO, a CW high-current quasi-gasdynamic ECR ion source, is under development at the IAP RAS. The quasi-gasdynamic confinement regime, featuring high plasma density (up to 10¹⁴ cm^-3) and moderate electron temperature (~100 eV), allowed to extract pulsed beams of H⁺ and D⁺ ions with current of 450 mA and RMS emittance <0.07 pi mm mrad. It has been already demonstrated that major benefits of quasi-gasdynamic confinement, previously tested in pulsed mode, are scalable to the CW operational mode. In first experiments at GISMO facility, the ion beams were extracted in pulsed mode from the CW plasma of ECR discharge due to technical limitations of cooling circuits. Proton beams with current up to 70 mA were achieved at extraction voltage of 40 kV. A new unique extraction system especially effective for the formation of high current density ion beams was developed. V. Skalyga, I. Izotov, S. Razin, A. Sidorov, S. Golubev, T. Kalvas, H. Koivisto, and O. Tarvainen. Review of Scientific Instruments 85, 02A702 (2014); https://doi.org/10.1063/1.4825074
	Slides MOWZO04 [3.681 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-MOWZO04
About •	Received ※ 27 September 2020 — Accepted ※ 18 May 2021 — Issue date ※ 02 September 2021
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOZZO02	ECR Discharge in a Single Solenoid Magnetic Field as a Source of the Wide-Aperture Dense Plasma Fluxes	plasma, solenoid, ECR, experiment	47
	I. Izotov, A. Bokhanov, S. Golubev, M.Yu. Kazakov, S. Razin, R.A. Shaposhnikov, S.P. Shlepnev, V. Skalyga IAP/RAS, Nizhny Novgorod, Russia
	Funding: The reported study was supported by RFBR, project #19-32-90079, and by Presidential Grants Foundation (Grant #MD-2745.2019.2) Sources of dense plasma fluxes with wide aperture are extensively used in applied science, i.e. surface treatment, and as a part of neutral beam injectors. ECR discharge in a solenoidal magnetic field (i.e. with no magnetic mirrors for plasma confinement), sustained by a powerful radiation of modern gyrotrons is under consideration at IAP RAS as a possible alternative to widely used vacuum arc, RF and helicon discharges. The use of a high frequency radiation (37.5 GHz) allows to obtain a discharge at lower pressure, sustain almost fully ionized plasma with density more than 10¹³ cm^-3, whereas the power on the level of several hundreds of kW allows one to create such a plasma in considerably large volume. In the present work fluxes of hydrogen plasma with the equivalent current density of 750 mA/cm² and the total current of 5 A were obtained. A multi-aperture multi-electrode extraction system design capable of forming the non-divergent ion beam was developed with the use of IBSimu code.
	Slides MOZZO02 [0.681 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-MOZZO02
About •	Received ※ 27 September 2020 — Revised ※ 30 January 2021 — Accepted ※ 13 May 2021 — Issue date ※ 18 May 2021
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUXZO03	Angular Distribution Measurement of Atoms Evaporated from a Resistive Oven Applied to Ion Beam Production	experiment, simulation, vacuum, ECR	72
	T. Thuillier, A. Leduc LPSC, Grenoble Cedex, France O. Bajeat, A. Leduc, L. Maunoury GANIL, Caen, France
	A low temperature oven has been developed to produce calcium beam with Electron Cyclotron Resonance Ion Source. The atom flux from the oven has been studied experimentally as a function of the temperature and the angle of emission by means of a quartz microbalance. The absolute flux measurement permitted to derive Antoine’s coefficient for the calcium sample used : A=8.98± 0.07 and B=7787± 110 in standard unit. The angular FWHM of the atom flux distribution is found to be 53.7±7.3 °at 848K. The atom flux hysteresis observed experimentally in several laboratories is explained as follows: at first calcium heating, the evaporation comes from the sample only resulting in a small evaporation rate. once a full calcium layer has formed on the crucible refractory wall, the caclcium evaporation surface includes the crucible’s enhancing dramatically the evaporation rate for a givent temperature. A Monte-Carlo code, developed to reproduce and investigate the oven behaviour as a function of temperature is presented. A discussion on the gas regime in the oven is proposed as a function of its temperature. A fair agreement between experiment and simulation is found.
	Slides TUXZO03 [4.542 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-TUXZO03
About •	Received ※ 28 September 2020 — Revised ※ 19 February 2021 — Accepted ※ 21 July 2021 — Issue date ※ 16 April 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUZZO01	Characterization of 2.45 GHz ECR Ion Source Bench for Accelerator-Based 14-MeV Neutron Generator	ECR, emittance, neutron, ion-source	95
	S.J. Vala, M. Abhangi, M. Bandyopadhyay, R. Kumar, R. Kumar Institute for Plasma Research, Bhat, Gandhinagar, India
	The 2.45 GHz Electron Cyclotron Resonance Ion Source (ECRIS) has been indigenously developed. This development of ECRIS aims to provide high brightness, stable, and reliable D⁺ ion beam of 20 mA beam current in a continuous (CW) mode operation for an accelerator-based D-T neutron generator. The ECR ion source setup consists of a microwave system, a magnet system, a double wall water-cooled plasma chamber, a high voltage platform, a three-electrode ion extraction system, and a vacuum system. The ECR ion source test setup is installed, and the deuterium plasma is generated. A three-electrode extraction system is designed and fabricated for the ion beam extraction. A ~10 mA deuterium ion beam is extracted from the ECR ion source. The paper covers the detailed experimental setup of ion beam characterization and diagnostics used for measurement of beam profile, beam current, and beam emittance measurements. It also covers the latest results of beam emittance measurements.
	Slides TUZZO01 [0.727 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-TUZZO01
About •	Received ※ 29 September 2020 — Revised ※ 23 December 2020 — Accepted ※ 19 May 2021 — Issue date ※ 28 June 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUZZO04	Status of the 60 GHz ECR Ion Source Research	plasma, ion-source, ECR, experiment	102
	T. André, J. Angot, M.A. Baylac, P. Sole, T. Thuillier LPSC, Grenoble Cedex, France F. Debray GHMFL, Grenoble, France I. Izotov, V. Skalyga IAP/RAS, Nizhny Novgorod, Russia
	SEISM is a compact ECR ion source operating at 60 GHz developed up to 2014. The prototype uses a magnetic cusp to confine the plasma. This simple magnetic geometry was chosen to allow the use of polyhelix coils (developed at the LNCMI, Grenoble) to generate a strong magnetic confinement featuring a closed ECR surface at 2.1 T. The plasma is sustained by a 300 kW microwave pulse of 1 ms duration and with a 2 Hz repetition rate. Previous experiments at LNCMI have successfully demonstrated the establishment of the nominal magnetic field and the extraction of ion beams with a current density up to ~ 1A/cm². The presence of "afterglow" peaks was also observed, proving the existence of ion confinement in a cusp ECR ion source. The last run was prematurely stopped but the project restarted in 2018 and new experiments are planned in 2021. A new transport beam line has been designed to improve ion beam transport towards the beam detectors. Short- and long-term research plans are presented, including numerical simulations of the beam transport line and future upgrades of the ion source with the main goal to transform the high current density measured into a real high intensity ion beam.
	Slides TUZZO04 [5.933 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-TUZZO04
About •	Received ※ 28 September 2020 — Revised ※ 15 January 2021 — Accepted ※ 14 February 2021 — Issue date ※ 14 July 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUZZO05	Multi-Species Child-Langmuir Law with Application to ECR Ion Sources	ECR, space-charge, ion-source, target	106
	C.Y. Wong ORNL, Oak Ridge, Tennessee, USA S.M. Lund FRIB, East Lansing, Michigan, USA
	We generalize the classical single-species Child-Langmuir Law to analyze multi-species beams from ECR ion sources. The formulation assumes the relative weight of each species in the extracted beam is known. We apply the results to charge state distribution data from Artemis- and Venus-type sources at the NSCL and LBNL respectively. The total measured beam current is close to the maximum current predicted by the multi-species Child Langmuir law in each case, which indicates that beam extraction occurs close to space-charge-limited flow conditions. Prospects for application of the results and further studies on the topic are outlined.
	Slides TUZZO05 [0.508 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-TUZZO05
About •	Received ※ 28 September 2020 — Revised ※ 28 December 2020 — Accepted ※ 16 January 2021 — Issue date ※ 18 May 2021
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEXZO03	Conceptual Design of an Electrostatic Trap for High Intensity Pulsed Beam	electron, ECR, ion-source, simulation	132
	W. Huang, Y.G. Liu, L.T. Sun, H.W. Zhao IMP/CAS, Lanzhou, People’s Republic of China L.T. Sun UCAS, Beijing, People’s Republic of China D.Z. Xie LBNL, Berkeley, California, USA
	Funding: China Scholarship Council (CSC) (No. 201904910324) Highly charged ion sources play an important role in the advancement of heavy ion accelerators worldwide. The beam requirements of highly charged heavy ions from new accelerators have driven the performance of ion sources to their limits and beyond. In parallel to developing new technologies to enhance the performance of ECR ion source, this paper presents a conceptual design of an ion trap aiming to convert a cw ion beam into a short beam pulse with high compression ratios. With an electron gun, a solenoid and a set of drift tubes, the injected ions will be trapped radially and axially. By manipulating the potential of drift tubes, ions can be accumulated with multiple injections and extracted at a fast or slow scheme. This paper presents the simulation and design results of this ion trap prototype.
	Slides WEXZO03 [0.910 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-WEXZO03
About •	Received ※ 21 September 2020 — Revised ※ 01 January 2021 — Accepted ※ 14 April 2021 — Issue date ※ 14 July 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEZZO02	Contaminants Reduction in ECR Charge Breeders by LNL LPSC GANIL Collaboration	plasma, vacuum, ECR, injection	151
	J. Angot, M.A. Baylac, M. Migliore, P. Sole, T. Thuillier LPSC, Grenoble Cedex, France A. Galatà INFN/LNL, Legnaro (PD), Italy L. Maunoury GANIL, Caen, France
	Contaminants reduction in Electron Cyclotron Resonance Charge Breeders (ECRCB) is a key point for the future experiments foreseen at LNL and GANIL Isotope Separation On Line (ISOL) facilities. According to the mass separator resolution set downstream the ECRCB, the radioactive ion beam study can be challenged in case of low production rate. An ongoing collaboration between LNL, LPSC and GANIL laboratories aims to improve the beam purity, acting on all the pollutant causes. Comparative experiments will be done at LPSC using different techniques, like covering the plasma chamber wall with liners of different materials. Different configurations of the ECRCB will also be tested, with the enhancement of the efficiency and charge breeding time parameters as additional objectives. A presentation of this program is proposed together with the recent upgrade of the LPSC 1+N+ test bench, with the aim to improve the vacuum quality.
	Slides WEZZO02 [1.915 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-WEZZO02
About •	Received ※ 29 September 2020 — Revised ※ 01 October 2020 — Accepted ※ 15 October 2020 — Issue date ※ 04 November 2020
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEZZO04	Improvement of the Efficiency of the TRIUMF Charge State Booster (CSB)	booster, ECR, ECRIS, 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
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

NACB04	Ion Simulations, Recent Upgrades and Tests with Titan’s Cooler Penning Trap	electron, plasma, simulation, injection	181
	R. Silwal, J. Dilling, B.A. Kootte, A.A. Kwiatkowski, S.F. Paul TRIUMF, Vancouver, Canada J. Dilling UBC & TRIUMF, Vancouver, British Columbia, Canada G. Gwinner, B.A. Kootte University of Manitoba, Manitoba, Canada R. Simpson UW/Physics, Waterloo, Ontario, Canada
	TRIUMF’s Ion Trap for Atomic and Nuclear science (TITAN) facility has the only on-line mass measurement Penning trap (MPET) at a radioactive beam facility that uses an electron beam ion trap (EBIT) to enhance mass precision and resolution. EBITs can charge breed exotic isotopes, making them highly charged, thereby improving the precision of atomic mass measurement as the precision scales linearly with the charge state. However, ion bunches charge bred in the EBIT can have larger energy spread, which poses challenges for mass measurements. A cooler Penning trap (CPET) is currently being developed off-line at TITAN to sympathetically cool the highly charged ions (HCI) with a co-trapped electron plasma, prior to their transport to the MPET. To evaluate the integration of the CPET into the TITAN beamline and to optimize the beam transport, ion trajectory simulations were performed. Hardware upgrades motivated by these simulations and previous test measurements were applied to the off-line CPET setup. Ions and electrons were co-trapped for the first time with the CPET. Progress and challenges on the path towards HCI cooling and integration with the on-line beam facility are presented
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-NACB04
About •	Received ※ 17 October 2020 — Revised ※ 23 October 2020 — Accepted ※ 01 December 2020 — Issue date ※ 07 February 2021
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

MOWZO04

GISMO Gasdynamic ECR Ion Source Status: Towards High-Intensity Ion Beams of Superior Quality

plasma, ion-source, ECR, neutron

13

I. Izotov, A. Bokhanov, E.M. Kiseleva, R.L. Lapin, V. Skalyga, S.S. Vybin
IAP/RAS, Nizhny Novgorod, Russia

Funding: The work was supported by RFBR, grant #20-32-70002, and within the state assignment of the Ministry of Science and Higher Education of the Russian Federation No. 0035-2019-0002.
GISMO, a CW high-current quasi-gasdynamic ECR ion source, is under development at the IAP RAS. The quasi-gasdynamic confinement regime, featuring high plasma density (up to 10¹⁴ cm^-3) and moderate electron temperature (~100 eV), allowed to extract pulsed beams of H⁺ and D⁺ ions with current of 450 mA and RMS emittance <0.07 pi mm mrad*. It has been already demonstrated that major benefits of quasi-gasdynamic confinement, previously tested in pulsed mode, are scalable to the CW operational mode. In first experiments at GISMO facility, the ion beams were extracted in pulsed mode from the CW plasma of ECR discharge due to technical limitations of cooling circuits. Proton beams with current up to 70 mA were achieved at extraction voltage of 40 kV. A new unique extraction system especially effective for the formation of high current density ion beams was developed.
* V. Skalyga, I. Izotov, S. Razin, A. Sidorov, S. Golubev, T. Kalvas, H. Koivisto, and O. Tarvainen. Review of Scientific Instruments 85, 02A702 (2014); https://doi.org/10.1063/1.4825074

Slides MOWZO04 [3.681 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-MOWZO04

About •

Received ※ 27 September 2020 — Accepted ※ 18 May 2021 — Issue date ※ 02 September 2021

Cite •

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

MOZZO02

ECR Discharge in a Single Solenoid Magnetic Field as a Source of the Wide-Aperture Dense Plasma Fluxes

plasma, solenoid, ECR, experiment

47

I. Izotov, A. Bokhanov, S. Golubev, M.Yu. Kazakov, S. Razin, R.A. Shaposhnikov, S.P. Shlepnev, V. Skalyga
IAP/RAS, Nizhny Novgorod, Russia

Funding: The reported study was supported by RFBR, project #19-32-90079, and by Presidential Grants Foundation (Grant #MD-2745.2019.2)
Sources of dense plasma fluxes with wide aperture are extensively used in applied science, i.e. surface treatment, and as a part of neutral beam injectors. ECR discharge in a solenoidal magnetic field (i.e. with no magnetic mirrors for plasma confinement), sustained by a powerful radiation of modern gyrotrons is under consideration at IAP RAS as a possible alternative to widely used vacuum arc, RF and helicon discharges. The use of a high frequency radiation (37.5 GHz) allows to obtain a discharge at lower pressure, sustain almost fully ionized plasma with density more than 10¹³ cm^-3, whereas the power on the level of several hundreds of kW allows one to create such a plasma in considerably large volume. In the present work fluxes of hydrogen plasma with the equivalent current density of 750 mA/cm² and the total current of 5 A were obtained. A multi-aperture multi-electrode extraction system design capable of forming the non-divergent ion beam was developed with the use of IBSimu code.

Slides MOZZO02 [0.681 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-MOZZO02

About •

Received ※ 27 September 2020 — Revised ※ 30 January 2021 — Accepted ※ 13 May 2021 — Issue date ※ 18 May 2021

Cite •

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

TUXZO03

Angular Distribution Measurement of Atoms Evaporated from a Resistive Oven Applied to Ion Beam Production

experiment, simulation, vacuum, ECR

72

T. Thuillier, A. Leduc
LPSC, Grenoble Cedex, France
O. Bajeat, A. Leduc, L. Maunoury
GANIL, Caen, France

A low temperature oven has been developed to produce calcium beam with Electron Cyclotron Resonance Ion Source. The atom flux from the oven has been studied experimentally as a function of the temperature and the angle of emission by means of a quartz microbalance. The absolute flux measurement permitted to derive Antoine’s coefficient for the calcium sample used : A=8.98± 0.07 and B=7787± 110 in standard unit. The angular FWHM of the atom flux distribution is found to be 53.7±7.3 °at 848K. The atom flux hysteresis observed experimentally in several laboratories is explained as follows: at first calcium heating, the evaporation comes from the sample only resulting in a small evaporation rate. once a full calcium layer has formed on the crucible refractory wall, the caclcium evaporation surface includes the crucible’s enhancing dramatically the evaporation rate for a givent temperature. A Monte-Carlo code, developed to reproduce and investigate the oven behaviour as a function of temperature is presented. A discussion on the gas regime in the oven is proposed as a function of its temperature. A fair agreement between experiment and simulation is found.

Slides TUXZO03 [4.542 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-TUXZO03

About •

Received ※ 28 September 2020 — Revised ※ 19 February 2021 — Accepted ※ 21 July 2021 — Issue date ※ 16 April 2022

Cite •

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

TUZZO01

Characterization of 2.45 GHz ECR Ion Source Bench for Accelerator-Based 14-MeV Neutron Generator

ECR, emittance, neutron, ion-source

95

S.J. Vala, M. Abhangi, M. Bandyopadhyay, R. Kumar, R. Kumar
Institute for Plasma Research, Bhat, Gandhinagar, India

The 2.45 GHz Electron Cyclotron Resonance Ion Source (ECRIS) has been indigenously developed. This development of ECRIS aims to provide high brightness, stable, and reliable D⁺ ion beam of 20 mA beam current in a continuous (CW) mode operation for an accelerator-based D-T neutron generator. The ECR ion source setup consists of a microwave system, a magnet system, a double wall water-cooled plasma chamber, a high voltage platform, a three-electrode ion extraction system, and a vacuum system. The ECR ion source test setup is installed, and the deuterium plasma is generated. A three-electrode extraction system is designed and fabricated for the ion beam extraction. A ~10 mA deuterium ion beam is extracted from the ECR ion source. The paper covers the detailed experimental setup of ion beam characterization and diagnostics used for measurement of beam profile, beam current, and beam emittance measurements. It also covers the latest results of beam emittance measurements.

Slides TUZZO01 [0.727 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-TUZZO01

About •

Received ※ 29 September 2020 — Revised ※ 23 December 2020 — Accepted ※ 19 May 2021 — Issue date ※ 28 June 2022

Cite •

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

TUZZO04

Status of the 60 GHz ECR Ion Source Research

plasma, ion-source, ECR, experiment

102

T. André, J. Angot, M.A. Baylac, P. Sole, T. Thuillier
LPSC, Grenoble Cedex, France
F. Debray
GHMFL, Grenoble, France
I. Izotov, V. Skalyga
IAP/RAS, Nizhny Novgorod, Russia

SEISM is a compact ECR ion source operating at 60 GHz developed up to 2014. The prototype uses a magnetic cusp to confine the plasma. This simple magnetic geometry was chosen to allow the use of polyhelix coils (developed at the LNCMI, Grenoble) to generate a strong magnetic confinement featuring a closed ECR surface at 2.1 T. The plasma is sustained by a 300 kW microwave pulse of 1 ms duration and with a 2 Hz repetition rate. Previous experiments at LNCMI have successfully demonstrated the establishment of the nominal magnetic field and the extraction of ion beams with a current density up to ~ 1A/cm². The presence of "afterglow" peaks was also observed, proving the existence of ion confinement in a cusp ECR ion source. The last run was prematurely stopped but the project restarted in 2018 and new experiments are planned in 2021. A new transport beam line has been designed to improve ion beam transport towards the beam detectors. Short- and long-term research plans are presented, including numerical simulations of the beam transport line and future upgrades of the ion source with the main goal to transform the high current density measured into a real high intensity ion beam.

Slides TUZZO04 [5.933 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-TUZZO04

About •

Received ※ 28 September 2020 — Revised ※ 15 January 2021 — Accepted ※ 14 February 2021 — Issue date ※ 14 July 2022

Cite •

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

TUZZO05

Multi-Species Child-Langmuir Law with Application to ECR Ion Sources

ECR, space-charge, ion-source, target

106

C.Y. Wong
ORNL, Oak Ridge, Tennessee, USA
S.M. Lund
FRIB, East Lansing, Michigan, USA

We generalize the classical single-species Child-Langmuir Law to analyze multi-species beams from ECR ion sources. The formulation assumes the relative weight of each species in the extracted beam is known. We apply the results to charge state distribution data from Artemis- and Venus-type sources at the NSCL and LBNL respectively. The total measured beam current is close to the maximum current predicted by the multi-species Child Langmuir law in each case, which indicates that beam extraction occurs close to space-charge-limited flow conditions. Prospects for application of the results and further studies on the topic are outlined.

Slides TUZZO05 [0.508 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-TUZZO05

About •

Received ※ 28 September 2020 — Revised ※ 28 December 2020 — Accepted ※ 16 January 2021 — Issue date ※ 18 May 2021

Cite •

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

WEXZO03

Conceptual Design of an Electrostatic Trap for High Intensity Pulsed Beam

electron, ECR, ion-source, simulation

132

W. Huang, Y.G. Liu, L.T. Sun, H.W. Zhao
IMP/CAS, Lanzhou, People’s Republic of China
L.T. Sun
UCAS, Beijing, People’s Republic of China
D.Z. Xie
LBNL, Berkeley, California, USA

Funding: China Scholarship Council (CSC) (No. 201904910324)
Highly charged ion sources play an important role in the advancement of heavy ion accelerators worldwide. The beam requirements of highly charged heavy ions from new accelerators have driven the performance of ion sources to their limits and beyond. In parallel to developing new technologies to enhance the performance of ECR ion source, this paper presents a conceptual design of an ion trap aiming to convert a cw ion beam into a short beam pulse with high compression ratios. With an electron gun, a solenoid and a set of drift tubes, the injected ions will be trapped radially and axially. By manipulating the potential of drift tubes, ions can be accumulated with multiple injections and extracted at a fast or slow scheme. This paper presents the simulation and design results of this ion trap prototype.

Slides WEXZO03 [0.910 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-WEXZO03

About •

Received ※ 21 September 2020 — Revised ※ 01 January 2021 — Accepted ※ 14 April 2021 — Issue date ※ 14 July 2022

Cite •

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

WEZZO02

Contaminants Reduction in ECR Charge Breeders by LNL LPSC GANIL Collaboration

plasma, vacuum, ECR, injection

151

J. Angot, M.A. Baylac, M. Migliore, P. Sole, T. Thuillier
LPSC, Grenoble Cedex, France
A. Galatà
INFN/LNL, Legnaro (PD), Italy
L. Maunoury
GANIL, Caen, France

Contaminants reduction in Electron Cyclotron Resonance Charge Breeders (ECRCB) is a key point for the future experiments foreseen at LNL and GANIL Isotope Separation On Line (ISOL) facilities. According to the mass separator resolution set downstream the ECRCB, the radioactive ion beam study can be challenged in case of low production rate. An ongoing collaboration between LNL, LPSC and GANIL laboratories aims to improve the beam purity, acting on all the pollutant causes. Comparative experiments will be done at LPSC using different techniques, like covering the plasma chamber wall with liners of different materials. Different configurations of the ECRCB will also be tested, with the enhancement of the efficiency and charge breeding time parameters as additional objectives. A presentation of this program is proposed together with the recent upgrade of the LPSC 1+N+ test bench, with the aim to improve the vacuum quality.

Slides WEZZO02 [1.915 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-WEZZO02

About •

Received ※ 29 September 2020 — Revised ※ 01 October 2020 — Accepted ※ 15 October 2020 — Issue date ※ 04 November 2020

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WEZZO04

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

booster, ECR, ECRIS, 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

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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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NACB04

Ion Simulations, Recent Upgrades and Tests with Titan’s Cooler Penning Trap

electron, plasma, simulation, injection

181

R. Silwal, J. Dilling, B.A. Kootte, A.A. Kwiatkowski, S.F. Paul
TRIUMF, Vancouver, Canada
J. Dilling
UBC & TRIUMF, Vancouver, British Columbia, Canada
G. Gwinner, B.A. Kootte
University of Manitoba, Manitoba, Canada
R. Simpson
UW/Physics, Waterloo, Ontario, Canada

TRIUMF’s Ion Trap for Atomic and Nuclear science (TITAN) facility has the only on-line mass measurement Penning trap (MPET) at a radioactive beam facility that uses an electron beam ion trap (EBIT) to enhance mass precision and resolution. EBITs can charge breed exotic isotopes, making them highly charged, thereby improving the precision of atomic mass measurement as the precision scales linearly with the charge state. However, ion bunches charge bred in the EBIT can have larger energy spread, which poses challenges for mass measurements. A cooler Penning trap (CPET) is currently being developed off-line at TITAN to sympathetically cool the highly charged ions (HCI) with a co-trapped electron plasma, prior to their transport to the MPET. To evaluate the integration of the CPET into the TITAN beamline and to optimize the beam transport, ion trajectory simulations were performed. Hardware upgrades motivated by these simulations and previous test measurements were applied to the off-line CPET setup. Ions and electrons were co-trapped for the first time with the CPET. Progress and challenges on the path towards HCI cooling and integration with the on-line beam facility are presented

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-NACB04

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Received ※ 17 October 2020 — Revised ※ 23 October 2020 — Accepted ※ 01 December 2020 — Issue date ※ 07 February 2021

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