ECRIS2018 - List of Authors (Toivanen, V.)

Paper	Title	Page
MOC4	SPIRAL1: A Versatile User Facility	29
	L. Maunoury, A.T. Annaluru, O. Bajeat, P. Delahaye, M. Dubois, R. Frigot, S. Hormigos, P. Jardin, O. Kamalou, P. Lecomte, O. Osmond, G. Peschard, B. Retailleau, A. Savalle, J.C. Thomas, V. Toivanen, P. Ujic GANIL, Caen, France J. Angot LPSC, Grenoble Cedex, France E.K. Traykov IPHC, Strasbourg Cedex 2, France
	SPIRAL1 Upgrade hardware is now almost completed. The FEBIAD 1+ source has been tested for the production of new radioactive isotopes, PHOENIX Charge Breeder (CB) is in place reproducing nearly the charge breeding efficiencies measured at LPSC lab and the infrastructure is operational to welcome such new multifaceted devices. The commissioning phase started in the second semester of 2017. It has consisted of a stepwise process to test the upgrade of the SPIRAL1 facility from simple validation (operation of CB as a stand-alone source) up to the production of the first 1+/n+ Radioactive Ion Beam (RIB) with the 37K9+. This contribution will summarize the different steps completed successfully and especially the measurements done to validate each of the commissioning stages. These include e.g. ionization efficiencies for CB; beam line optics for 1+/n+ and charge breeding efficiencies. The remaining effort required to ensure the reliability of the complete system for routine RIB operation is also presented. A section will be dedicated to a new feature of SPIRAL1 facility: combination of CB and CIME leads to deliver stable beams with energies never done until now.
	Slides MOC4 [2.712 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2018-MOC4
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MOC5	1 + / N + Method: Numerical Simulation Studies and Experimental Measurements on the SPIRAL1 Charge Breeder	34
	A.T. Annaluru, P. Delahaye, M. Dubois, P. Jardin, O. Kamalou, L. Maunoury, A. Savalle, V. Toivanen, P. Ujic GANIL, Caen, France E.K. Traykov IPHC, Strasbourg Cedex 2, France
	In the framework of the SPIRAL1 facility, the R \& D of charge breeding technique is of primary interest for optimizing the yields of radioactive ion beams (RIBs). This technique involves the transformation of mono-charged ion beams into multi-charged ion beams by operating an Electron Cyclotron Resonance (ECR) charge breeder (CB). During the SPIRAL1 commissioning, experimental studies have been performed in order to understand the transport of the beam through the CB with and without ECR plasma. Numerical simulations including ion optics and some ECR plasma features have been developed to evaluate ion losses during the ion transport through the CB with and without a simplified model of the ECR plasma.
	Slides MOC5 [1.689 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2018-MOC5
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOC6	Redesign of the GANIL GTS ECRIS for 1+/n+ Studies	39
	V. Toivanen, P. Jardin, L. Maunoury, C. Michel GANIL, Caen, France
	More than half of the beams produced at GANIL are metallic elements, underlining the importance of their continuing development. Compared to the conventional techniques (oven, sputtering, MIVOC), the 1+/n+ method has demonstrated superior ionization efficiencies, suggesting the potential for improved metal beam production. Dedicated studies are required to assess the feasibility of this approach. The SPIRAL1 Charge Breeder is now in operation at the GANIL radioactive beam facility SPIRAL1. Operation in high radiation area poses challenges for its future development. A separate test stand supporting charge breeder and metal ion beam R&D is thus desirable. The GTS 14.5 GHz ECRIS has been chosen as a platform for 1+/n+ studies. After the upgrade program of 2017-2018, the GTS provides good performance and versatility, making it well-suited for ion source R&D. A new injection module has been designed for 1+ injection into the GTS plasma to be used in the 1+/n+ studies. It can be easily replaced with the conventional system for normal ion source operation. The design of the new injection system will be presented in detail with ion optical simulations of the 1+ beam injection.
	Slides MOC6 [2.371 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2018-MOC6
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUP21	Study of the Lead Evaporation from the Oven of the GTS-LHC Ion Source	131
	T. Koevener, D. Küchler CERN, Geneva, Switzerland V. Toivanen GANIL, Caen, France
	The GTS-LHC ECR ion source at CERN provides heavy ion beams for the chain of accelerators from Linac3 up to the LHC and the SPS fixed target experiments. During the standard operation the oven technique is used to insert lead into the source plasma to produce multiply charged lead ion beams. Many years of experience show that some of the source instabilities can be linked to the oven performance. The evaporation seems not to be constant and when the oven reaches its maximum power, an indication that a refill is required, often half of the original lead sample is still present inside the oven crucible. A dedicated study of the oven using an offline test stand as well as thermal and gas dynamics simulations intends to help to identify the reasons for these experimental observations. The goal is to find design modifications to stabilize the evaporation rate and to prolong the oven runtime. This contribution presents the latest results of the study.
	Poster TUP21 [2.092 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2018-TUP21
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TUP23	Operation of the GTS-LHC ECR Ion Source in Afterglow With Varying Klystron Frequency	139
	D. Küchler, M. O'Neil CERN, Geneva, Switzerland V. Toivanen GANIL, Caen, France
	The GTS-LHC ECR ion source delivers lead ions for the CERN heavy ion programme at the LHC and the SPS fixed target physics. The source is normally operated with a main microwave frequency of 14.5 GHz in the afterglow mode. As part of the consolidation the microwave generator was replaced with a klystron based generator that allows free variation of the operating frequency in a range of 14.0 ' 14.5 GHz. The aim of this study was to see how the lead charge state Pb²⁹⁺, which is the main ion species produced for experiments, is influenced by the different frequencies. Variations in performance were observed (beam intensity and beam stability), but no frequencies were found that would provide significant performance improvements compared to normal operation at 14.5 GHz. The results in general suggest that for the GTS-LHC ion source the optimal operating frequency depends on the overall source tuning and the influence of varying the main frequency is comparable to adjusting the other tuning parameters.
	Poster TUP23 [26.814 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2018-TUP23
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

SPIRAL1: A Versatile User Facility

29

L. Maunoury, A.T. Annaluru, O. Bajeat, P. Delahaye, M. Dubois, R. Frigot, S. Hormigos, P. Jardin, O. Kamalou, P. Lecomte, O. Osmond, G. Peschard, B. Retailleau, A. Savalle, J.C. Thomas, V. Toivanen, P. Ujic
GANIL, Caen, France
J. Angot
LPSC, Grenoble Cedex, France
E.K. Traykov
IPHC, Strasbourg Cedex 2, France

SPIRAL1 Upgrade hardware is now almost completed. The FEBIAD 1+ source has been tested for the production of new radioactive isotopes, PHOENIX Charge Breeder (CB) is in place reproducing nearly the charge breeding efficiencies measured at LPSC lab and the infrastructure is operational to welcome such new multifaceted devices. The commissioning phase started in the second semester of 2017. It has consisted of a stepwise process to test the upgrade of the SPIRAL1 facility from simple validation (operation of CB as a stand-alone source) up to the production of the first 1+/n+ Radioactive Ion Beam (RIB) with the 37K9+. This contribution will summarize the different steps completed successfully and especially the measurements done to validate each of the commissioning stages. These include e.g. ionization efficiencies for CB; beam line optics for 1+/n+ and charge breeding efficiencies. The remaining effort required to ensure the reliability of the complete system for routine RIB operation is also presented. A section will be dedicated to a new feature of SPIRAL1 facility: combination of CB and CIME leads to deliver stable beams with energies never done until now.

Slides MOC4 [2.712 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2018-MOC4

Export •

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

MOC5

1 + / N + Method: Numerical Simulation Studies and Experimental Measurements on the SPIRAL1 Charge Breeder

34

A.T. Annaluru, P. Delahaye, M. Dubois, P. Jardin, O. Kamalou, L. Maunoury, A. Savalle, V. Toivanen, P. Ujic
GANIL, Caen, France
E.K. Traykov
IPHC, Strasbourg Cedex 2, France

In the framework of the SPIRAL1 facility, the R \& D of charge breeding technique is of primary interest for optimizing the yields of radioactive ion beams (RIBs). This technique involves the transformation of mono-charged ion beams into multi-charged ion beams by operating an Electron Cyclotron Resonance (ECR) charge breeder (CB). During the SPIRAL1 commissioning, experimental studies have been performed in order to understand the transport of the beam through the CB with and without ECR plasma. Numerical simulations including ion optics and some ECR plasma features have been developed to evaluate ion losses during the ion transport through the CB with and without a simplified model of the ECR plasma.

Slides MOC5 [1.689 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2018-MOC5

Export •

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

MOC6

Redesign of the GANIL GTS ECRIS for 1+/n+ Studies

39

V. Toivanen, P. Jardin, L. Maunoury, C. Michel
GANIL, Caen, France

More than half of the beams produced at GANIL are metallic elements, underlining the importance of their continuing development. Compared to the conventional techniques (oven, sputtering, MIVOC), the 1+/n+ method has demonstrated superior ionization efficiencies, suggesting the potential for improved metal beam production. Dedicated studies are required to assess the feasibility of this approach. The SPIRAL1 Charge Breeder is now in operation at the GANIL radioactive beam facility SPIRAL1. Operation in high radiation area poses challenges for its future development. A separate test stand supporting charge breeder and metal ion beam R&D is thus desirable. The GTS 14.5 GHz ECRIS has been chosen as a platform for 1+/n+ studies. After the upgrade program of 2017-2018, the GTS provides good performance and versatility, making it well-suited for ion source R&D. A new injection module has been designed for 1+ injection into the GTS plasma to be used in the 1+/n+ studies. It can be easily replaced with the conventional system for normal ion source operation. The design of the new injection system will be presented in detail with ion optical simulations of the 1+ beam injection.

Slides MOC6 [2.371 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2018-MOC6

Export •

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

TUP21

Study of the Lead Evaporation from the Oven of the GTS-LHC Ion Source

131

T. Koevener, D. Küchler
CERN, Geneva, Switzerland
V. Toivanen
GANIL, Caen, France

The GTS-LHC ECR ion source at CERN provides heavy ion beams for the chain of accelerators from Linac3 up to the LHC and the SPS fixed target experiments. During the standard operation the oven technique is used to insert lead into the source plasma to produce multiply charged lead ion beams. Many years of experience show that some of the source instabilities can be linked to the oven performance. The evaporation seems not to be constant and when the oven reaches its maximum power, an indication that a refill is required, often half of the original lead sample is still present inside the oven crucible. A dedicated study of the oven using an offline test stand as well as thermal and gas dynamics simulations intends to help to identify the reasons for these experimental observations. The goal is to find design modifications to stabilize the evaporation rate and to prolong the oven runtime. This contribution presents the latest results of the study.

Poster TUP21 [2.092 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2018-TUP21

Export •

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

TUP23

Operation of the GTS-LHC ECR Ion Source in Afterglow With Varying Klystron Frequency

139

D. Küchler, M. O'Neil
CERN, Geneva, Switzerland
V. Toivanen
GANIL, Caen, France

The GTS-LHC ECR ion source delivers lead ions for the CERN heavy ion programme at the LHC and the SPS fixed target physics. The source is normally operated with a main microwave frequency of 14.5 GHz in the afterglow mode. As part of the consolidation the microwave generator was replaced with a klystron based generator that allows free variation of the operating frequency in a range of 14.0 ' 14.5 GHz. The aim of this study was to see how the lead charge state Pb²⁹⁺, which is the main ion species produced for experiments, is influenced by the different frequencies. Variations in performance were observed (beam intensity and beam stability), but no frequencies were found that would provide significant performance improvements compared to normal operation at 14.5 GHz. The results in general suggest that for the GTS-LHC ion source the optimal operating frequency depends on the overall source tuning and the influence of varying the main frequency is comparable to adjusting the other tuning parameters.

Poster TUP23 [26.814 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2018-TUP23

Export •

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