ECRIS2018 - List of Authors (Kuchler, D.)

Paper	Title	Page
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)

Paper

Title

Page

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)