Koivisto, H. A.

Paper	Title	Page
MOCO-B04	Ion Beam Research and Development Work at JYFL	18
	H. A. Koivisto, T. Ropponen, M. Savonen, V. A. Toivanen JYFL, Jyvaskyla
	During the last year the main focus of the JYFL ion source group has been on the studies of the beam transmission and time evolution of Bremsstrahlung and on the development of metal ion beams. Comprehensive studies of the beam transmission efficiency at the Department of Physics, University of Jyvaskyla have shown several problems concerning the injection line of the K-130 cyclotron. The experiments have shown strongly non-uniform and elliptical beam shape which limits the beam transmission efficiency. The Bremsstrahlung time evolution will be presented in other article in this same proceedings (T. Ropponen et. al). We will also shortly describe the development work carried out by the inductively heated oven.
	Slides
TUCO-D01	Measurements of Electron Cyclotron Resonance Ion Source Bremsstrahlung Time Evolution and Preglow Effect	160
	T. Ropponen, P. Jones, T. Kalvas, H. A. Koivisto, P. Peura JYFL, Jyvaskyla P. Suominen Prizztech Ltd, Magnet Technology Centre, Pori O. A. Tarvainen LANL, Los Alamos, New Mexico
	In order to understand properly the ECR heating and hot electron generation time evolution, measurements of ECRIS bremsstrahlung in radial direction using pulsed RF power with JYFL 14 GHz ECRIS have been performed. The effects of RF power, plasma species, neutral gas pressure and axial magnetic field strength were studied. So-called "preglow effect" for different charge states was studied in conjunction with the bremsstrahlung measurements. An analysis code that combines the bremsstrahlung data i.e. energy and time of incidence from consecutive RF pulses has been written. This method ensures that enough statistics is used for interpretation of the results. Pile-ups, ADC overflows and such disturbances are removed from the Ge detector spectra by using digital signal processing unit. In this paper the time evolution of the electron population with energies over 15 keV in millisecond region time intervals will be presented and the time scale of the preglow effect is connected into the development of the electron energy distribution.
	Slides