DIPAC2011 - List of Keywords (space-charge)

Paper	Title	Other Keywords	Page
MOPD93	Investigation of Diagnostic Techniques on a Nonneutral Plasma	electron, plasma, ion, diagnostics	266
	K. Schulte, M. Droba, O. Meusel, U. Ratzinger IAP, Frankfurt am Main, Germany
	Funding: Work supported by HIC for FAIR, BMBF No. 06FY90891. Space charge lenses use a confined electron cloud for the focusing of ion beams. The focusing strength is given by the electron density whereas the density distribution influences the mapping quality of the space charge lens and is related to the confinement. The plasma parameters, loss as well as production mechanisms have a strong impact on plasma beam interactions. A scaled up space charge lens was constructed to investigate the properties of a nonneutral plasmas in detail. New non-interceptive diagnostic has been developed to characterize the collective behaviour of the confined nonneutral plasma in terms of an optimized lens design and parameters. Experimental results will be presented in comparison with numerical simulations.
	Poster MOPD93 [3.587 MB]

TUPD51	Ionization Profile Monitors - IPM @ GSI	high-voltage, ion, electron, synchrotron	419
	T. Giacomini, P. Forck GSI, Darmstadt, Germany J.G. De Villiers iThemba LABS, Somerset West, South Africa J. Dietrich FZJ, Jülich, Germany D.A. Liakin ITEP, Moscow, Russia
	The Ionization Profile Monitor in the SIS18 is frequently used for machine development. The permanent availability and the elaborated software user interface make it easy and comfortable to use. Additional to the beam profile data the device records the data of synchrotron dc current, dipole ramp and accelerating rf properties. The trend curves of these data are shown correlated to the beam profile evolution for a full synchrotron cycle from injection to extraction with 100 profiles/s. The reliable function is based on the optimized in-vacuum hardware design, like the stable high voltage connections, the electric field box with very uniform field distribution and the uv-light based calibration system. The permanent availability is based on the convenient software interface using the Qt library. A new IPM generation was recently commissioned in the experimental storage ring ESR at GSI and one in the COSY ring at FZ-Jülich. These monitors are enhancements of the SIS18 multiwire IPM but equipped with an especially developed large area 50x100 mm² optical particle detector of rectangular shape that is readout by a digital camera through a viewport.

WEOA03	Detailed Experimental Characterization of an Ionization Profile Monitor	extraction, electron, ion, target	547
	J. Egberts, P. Abbon, F. Jeanneau, J.-Ph. Mols, T. Papaevangelou CEA, Gif-sur-Yvette, France F. Becker, P. Forck, B. Walasek-Höhne GSI, Darmstadt, Germany J. Marroncle CEA/DSM/IRFU, France
	Funding: Marie Curie Fellowship by the EU In the frame of the International Fusion Material Irradiation Facility (IFMIF), a prototype for a non-interceptive transverse beam profile monitor based on residual gas ionization (IPM) has been built and characterized in detail. We present results of test measurements performed at CEA Saclay with 80 keV protons in a cw beam of up to 10 mA and at GSI Darmstadt with pulsed Ca¹⁰⁺, Xe²¹⁺ and U²⁸⁺ beams of up to 1.6 mA at 5 MeV/u. The effects of N₂, and different rare gases in the pressure range from 4•10^-7 mbar to 5•10^-4 mbar have been investigated. The signal was read by different electronic cards, based on linear and logarithmic amplifiers as well as on charge integration. Furthermore the extraction voltage of the IPM-field-box was varied between 0.5 and 5 kV. Beam profiles were investigated with respect to signal intensity and profile shape and were compared to a SEM-grid and a Beam Induced Fluorescence monitor. Profiles of all monitors match nicely for the residual gases with differences in beam width well below 5%. Additional tests on the characteristics of the IPM have been performed and will be presented as well.
	Slides WEOA03 [1.964 MB]

Paper

Title

Other Keywords

Page

MOPD93

Investigation of Diagnostic Techniques on a Nonneutral Plasma

electron, plasma, ion, diagnostics

266

K. Schulte, M. Droba, O. Meusel, U. Ratzinger
IAP, Frankfurt am Main, Germany

Funding: Work supported by HIC for FAIR, BMBF No. 06FY90891.
Space charge lenses use a confined electron cloud for the focusing of ion beams. The focusing strength is given by the electron density whereas the density distribution influences the mapping quality of the space charge lens and is related to the confinement. The plasma parameters, loss as well as production mechanisms have a strong impact on plasma beam interactions. A scaled up space charge lens was constructed to investigate the properties of a nonneutral plasmas in detail. New non-interceptive diagnostic has been developed to characterize the collective behaviour of the confined nonneutral plasma in terms of an optimized lens design and parameters. Experimental results will be presented in comparison with numerical simulations.

Poster MOPD93 [3.587 MB]

TUPD51

Ionization Profile Monitors - IPM @ GSI

high-voltage, ion, electron, synchrotron

419

T. Giacomini, P. Forck
GSI, Darmstadt, Germany
J.G. De Villiers
iThemba LABS, Somerset West, South Africa
J. Dietrich
FZJ, Jülich, Germany
D.A. Liakin
ITEP, Moscow, Russia

The Ionization Profile Monitor in the SIS18 is frequently used for machine development. The permanent availability and the elaborated software user interface make it easy and comfortable to use. Additional to the beam profile data the device records the data of synchrotron dc current, dipole ramp and accelerating rf properties. The trend curves of these data are shown correlated to the beam profile evolution for a full synchrotron cycle from injection to extraction with 100 profiles/s. The reliable function is based on the optimized in-vacuum hardware design, like the stable high voltage connections, the electric field box with very uniform field distribution and the uv-light based calibration system. The permanent availability is based on the convenient software interface using the Qt library. A new IPM generation was recently commissioned in the experimental storage ring ESR at GSI and one in the COSY ring at FZ-Jülich. These monitors are enhancements of the SIS18 multiwire IPM but equipped with an especially developed large area 50x100 mm² optical particle detector of rectangular shape that is readout by a digital camera through a viewport.

WEOA03

Detailed Experimental Characterization of an Ionization Profile Monitor

extraction, electron, ion, target

547

J. Egberts, P. Abbon, F. Jeanneau, J.-Ph. Mols, T. Papaevangelou
CEA, Gif-sur-Yvette, France
F. Becker, P. Forck, B. Walasek-Höhne
GSI, Darmstadt, Germany
J. Marroncle
CEA/DSM/IRFU, France

Funding: Marie Curie Fellowship by the EU
In the frame of the International Fusion Material Irradiation Facility (IFMIF), a prototype for a non-interceptive transverse beam profile monitor based on residual gas ionization (IPM) has been built and characterized in detail. We present results of test measurements performed at CEA Saclay with 80 keV protons in a cw beam of up to 10 mA and at GSI Darmstadt with pulsed Ca¹⁰⁺, Xe²¹⁺ and U²⁸⁺ beams of up to 1.6 mA at 5 MeV/u. The effects of N₂, and different rare gases in the pressure range from 4•10^-7 mbar to 5•10^-4 mbar have been investigated. The signal was read by different electronic cards, based on linear and logarithmic amplifiers as well as on charge integration. Furthermore the extraction voltage of the IPM-field-box was varied between 0.5 and 5 kV. Beam profiles were investigated with respect to signal intensity and profile shape and were compared to a SEM-grid and a Beam Induced Fluorescence monitor. Profiles of all monitors match nicely for the residual gases with differences in beam width well below 5%. Additional tests on the characteristics of the IPM have been performed and will be presented as well.

Slides WEOA03 [1.964 MB]