ECRIS-2014 - List of Authors (Toivanen, V.)

Paper

Title

Page

Periodic Beam Burrent Oscillations Driven By Electron Cyclotron Instabilities In ECRIS Plasmas

5

O.A. Tarvainen, T. Kalvas, H. A. Koivisto, J.P.O. Komppula, R.J. Kronholm, J.P. Laulainen
JYFL, Jyväskylä, Finland
I. Izotov, D. Mansfeld, V. Skalyga
IAP/RAS, Nizhny Novgorod, Russia
V. Toivanen
CERN, Geneva, Switzerland

Experimental observation of cyclotron instabilities in electron cyclotron resonance ion source plasma operated in cw-mode is reported. The instabilities are associated with strong microwave emission and a burst of energetic electrons escaping the plasma, and explain the periodic oscillations of the extracted beam currents. The instabilities are shown to restrict the parameter space available for the optimization of high charge state ion currents.

Slides MOOBMH01 [2.020 MB]

MOOAMH01

Simulation Of The CERN GTS-LHC ECR Ion Source Extraction System With Lead And Argon Ion Beams

23

V. Toivanen, G. Bellodi, D. Küchler, A.M. Lombardi, R. Scrivens, J.T. Stafford-Haworth
CERN, Geneva, Switzerland

A comprehensive study of beam formation and beam transport has been initiated in order to improve the performance of the CERN heavy ion injector, Linac3. As part of this study, the ion beam extraction system of the CERN GTS-LHC 14.5 GHz Electron Cyclotron Resonance Ion Source (ECRIS) has been modelled with the ion optical code IBSimu. The simulations predict self-consistently the triangular and hollow beam structures which are often observed experimentally with ECRIS ion beams. The model is used to investigate the performance of the current extraction system and provides a basis for possible future improvements. In addition, the extraction simulation provides a more realistic representation of the initial beam properties for the beam transport simulations, which aim to identify the performance bottle necks along the Linac3 low energy beam transport. The results of beam extraction simulations with Pb and Ar ion beams from the GTS-LHC will be presented and compared with experimental observations.

Slides MOOAMH01 [2.525 MB]

THOMMH01

Boron Ion Beam Production with the Supernanogan ECR Ion Source for the CERN BIO-LEIR Facility

132

J.T. Stafford-Haworth, D. Küchler, V. Toivanen
CERN, Geneva, Switzerland
J. Röhrich
HZB, Berlin, Germany

To deliver B³⁺ ions for medical research the compounds decaborane and m-carborane were tested using the metal ions from volatile compounds (MIVOC) method with the Supernanogan 14.5 GHz ECR ion source. Using decaborane the source delivered less than 10 uA intensity of B³⁺ and after operation large deposits of material were found inside the source. Using m-carborane 50 uA of B³⁺ were delivered without support gas. For both compounds Helium and Oxygen support gasses were also tested, and the effects of different source tuning parameters are discussed. The average consumption of m-Carborane was 0.1 mg/uAh over all operation.

Slides THOMMH01 [2.223 MB]

Paper	Title	Page
MOOBMH01	Periodic Beam Burrent Oscillations Driven By Electron Cyclotron Instabilities In ECRIS Plasmas	5
	O.A. Tarvainen, T. Kalvas, H. A. Koivisto, J.P.O. Komppula, R.J. Kronholm, J.P. Laulainen JYFL, Jyväskylä, Finland I. Izotov, D. Mansfeld, V. Skalyga IAP/RAS, Nizhny Novgorod, Russia V. Toivanen CERN, Geneva, Switzerland
	Experimental observation of cyclotron instabilities in electron cyclotron resonance ion source plasma operated in cw-mode is reported. The instabilities are associated with strong microwave emission and a burst of energetic electrons escaping the plasma, and explain the periodic oscillations of the extracted beam currents. The instabilities are shown to restrict the parameter space available for the optimization of high charge state ion currents.
	Slides MOOBMH01 [2.020 MB]

MOOAMH01	Simulation Of The CERN GTS-LHC ECR Ion Source Extraction System With Lead And Argon Ion Beams	23
	V. Toivanen, G. Bellodi, D. Küchler, A.M. Lombardi, R. Scrivens, J.T. Stafford-Haworth CERN, Geneva, Switzerland
	A comprehensive study of beam formation and beam transport has been initiated in order to improve the performance of the CERN heavy ion injector, Linac3. As part of this study, the ion beam extraction system of the CERN GTS-LHC 14.5 GHz Electron Cyclotron Resonance Ion Source (ECRIS) has been modelled with the ion optical code IBSimu. The simulations predict self-consistently the triangular and hollow beam structures which are often observed experimentally with ECRIS ion beams. The model is used to investigate the performance of the current extraction system and provides a basis for possible future improvements. In addition, the extraction simulation provides a more realistic representation of the initial beam properties for the beam transport simulations, which aim to identify the performance bottle necks along the Linac3 low energy beam transport. The results of beam extraction simulations with Pb and Ar ion beams from the GTS-LHC will be presented and compared with experimental observations.
	Slides MOOAMH01 [2.525 MB]

THOMMH01	Boron Ion Beam Production with the Supernanogan ECR Ion Source for the CERN BIO-LEIR Facility	132
	J.T. Stafford-Haworth, D. Küchler, V. Toivanen CERN, Geneva, Switzerland J. Röhrich HZB, Berlin, Germany
	To deliver B³⁺ ions for medical research the compounds decaborane and m-carborane were tested using the metal ions from volatile compounds (MIVOC) method with the Supernanogan 14.5 GHz ECR ion source. Using decaborane the source delivered less than 10 uA intensity of B³⁺ and after operation large deposits of material were found inside the source. Using m-carborane 50 uA of B³⁺ were delivered without support gas. For both compounds Helium and Oxygen support gasses were also tested, and the effects of different source tuning parameters are discussed. The average consumption of m-Carborane was 0.1 mg/uAh over all operation.
	Slides THOMMH01 [2.223 MB]