ECRIS2012 - List of Keywords (experiment)

Paper	Title	Other Keywords	Page
TUYO03	Secondary-electron-enhanced Plasma as an Alternative to Double/Variable-frequency Heating in ECRIS	plasma, ECRIS, ion, electron	22
	K.E. Stiebing IKF, Frankfurt-am-Main, Germany S. Dobrescu, L. Schächter IFIN, Magurele- Bucuresti, Romania
	As "double frequency heating" (DFH) now has become the method of choice to optimize the output from the newest generation ECRIS, it was a challenge to compare this method with the comparatively cheap method of "metal dielectric" (MD) structures introduced into the plasma chamber, which has also proven to strongly enrich the plasma with electrons that are effectively trapped and heated. Two RF-systems have been launched to the 14 GHz ECRIS, however, not allowing RF-differences as large as 1.5 GHz as demanded for DFH. Therefore the source was operated in a "frequency tuning" mode (FT) by optimizing the frequency difference by the output of Ar¹⁴⁺ ions. The data without and with MD-configuration are compared and related to data for the DFH. On the basis of Bremsstrahlung radiation spectroscopy and charge state analysis, it turned out that the FT-mode does not change the source performance substantially. The measured effects are in the order of 20% to 30% as reported elsewhere. In contrast to this, the enhancement gained by the MD method is much higher. The measured enhancement ratios even surpass those reported for real double frequency heating.
	Slides TUYO03 [5.642 MB]

TUPP14	Beam Experiments with the Grenoble Test Electron Cyclotron Resonance Ion Source at iThemba LABS	operation, ion, injection, cyclotron	68
	R.W. Thomae, J.L. Conradie, D.T. Fourie iThemba LABS, Somerset West, South Africa D. Küchler CERN, Geneva, Switzerland
	At iThemba Laboratory for Accelerator Based Sciences a copy of the so-called Grenoble Test Source (GTS) for the production of highly charged ions is installed. The source in combination with the K-200 cyclotron delivers high energy, high intensity beams for nuclear physics experiments. In this paper we present beam experiments with the GTS at iThemba LABS, in which the results of CW, pulsed and afterglow operation for different bias disc voltages and positions are compared.
	Poster TUPP14 [0.336 MB]

THYO01	Operation of an ECRIS Charge State Breeder at TRIUMF	ion, background, plasma, ECR	163
	F. Ames, R.A. Baartman, P.G. Bricault, K. Jayamanna, A. Mjøs TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
	After initial commissioning of the charge state breeder for radioactive ions at the TRIUMF/ISAC facility further tests on the performance of the system have been performed. One of the major problems found was the high background of stable ions from the ECR source, mainly C, N, O, Ar, Fe, Ni, C and Cr. The main source of those is the residual gas and sputtered material from the plasma chamber wall and from the surrounding electrodes. Although their intensity is small it can be orders of magnitude more than the intensity from the radioactive ions. Therefore, the original stainless steel plasma chamber of the Pantechnik PHOENIX ECR source has been exchanged to aluminium with an ultra pure aluminium coating, all electrodes for injection and extraction of the ions have been replaced with aluminium and the iron joke at the extraction side, which is part of the vacuum system in the PHOENIX source has been coated as well. This combined effect has reduced the amount of background ions substantially. Detailed results on the performance of the source after those changes will be presented.
	Slides THYO01 [1.634 MB]

Paper

Title

Other Keywords

Page

TUYO03

Secondary-electron-enhanced Plasma as an Alternative to Double/Variable-frequency Heating in ECRIS

plasma, ECRIS, ion, electron

22

K.E. Stiebing
IKF, Frankfurt-am-Main, Germany
S. Dobrescu, L. Schächter
IFIN, Magurele- Bucuresti, Romania

As "double frequency heating" (DFH) now has become the method of choice to optimize the output from the newest generation ECRIS, it was a challenge to compare this method with the comparatively cheap method of "metal dielectric" (MD) structures introduced into the plasma chamber, which has also proven to strongly enrich the plasma with electrons that are effectively trapped and heated. Two RF-systems have been launched to the 14 GHz ECRIS, however, not allowing RF-differences as large as 1.5 GHz as demanded for DFH. Therefore the source was operated in a "frequency tuning" mode (FT) by optimizing the frequency difference by the output of Ar¹⁴⁺ ions. The data without and with MD-configuration are compared and related to data for the DFH. On the basis of Bremsstrahlung radiation spectroscopy and charge state analysis, it turned out that the FT-mode does not change the source performance substantially. The measured effects are in the order of 20% to 30% as reported elsewhere. In contrast to this, the enhancement gained by the MD method is much higher. The measured enhancement ratios even surpass those reported for real double frequency heating.

Slides TUYO03 [5.642 MB]

TUPP14

Beam Experiments with the Grenoble Test Electron Cyclotron Resonance Ion Source at iThemba LABS

operation, ion, injection, cyclotron

68

R.W. Thomae, J.L. Conradie, D.T. Fourie
iThemba LABS, Somerset West, South Africa
D. Küchler
CERN, Geneva, Switzerland

At iThemba Laboratory for Accelerator Based Sciences a copy of the so-called Grenoble Test Source (GTS) for the production of highly charged ions is installed. The source in combination with the K-200 cyclotron delivers high energy, high intensity beams for nuclear physics experiments. In this paper we present beam experiments with the GTS at iThemba LABS, in which the results of CW, pulsed and afterglow operation for different bias disc voltages and positions are compared.

Poster TUPP14 [0.336 MB]

THYO01

Operation of an ECRIS Charge State Breeder at TRIUMF

ion, background, plasma, ECR

163

F. Ames, R.A. Baartman, P.G. Bricault, K. Jayamanna, A. Mjøs
TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada

After initial commissioning of the charge state breeder for radioactive ions at the TRIUMF/ISAC facility further tests on the performance of the system have been performed. One of the major problems found was the high background of stable ions from the ECR source, mainly C, N, O, Ar, Fe, Ni, C and Cr. The main source of those is the residual gas and sputtered material from the plasma chamber wall and from the surrounding electrodes. Although their intensity is small it can be orders of magnitude more than the intensity from the radioactive ions. Therefore, the original stainless steel plasma chamber of the Pantechnik PHOENIX ECR source has been exchanged to aluminium with an ultra pure aluminium coating, all electrodes for injection and extraction of the ions have been replaced with aluminium and the iron joke at the extraction side, which is part of the vacuum system in the PHOENIX source has been coated as well. This combined effect has reduced the amount of background ions substantially. Detailed results on the performance of the source after those changes will be presented.

Slides THYO01 [1.634 MB]