PAC2013 - List of Authors (Piller, C.)

Paper	Title	Page
TUPSM22	Improving Efficiency of Ions Production in Ion Source with Saddle Antenna	682
	V.G. Dudnikov, R.P. Johnson Muons, Inc, Illinois, USA T.R. Pennisi, C. Piller, M. Santana, M.P. Stockli, R.F. Welton ORNL, Oak Ridge, Tennessee, USA M.W. Turvey University of Florida, Gainesville, Florida, USA
	Funding: Work supported in part by US DOE Contract DE-AC05-00OR22725 and by STTR grant DE-SC0002690. Extraction of negative ions from RF surface plasma source (SPS) with saddle antenna radio frequency (SA RF) discharge is considered. Several versions of new plasma generators with different antennas and magnetic field configurations were tested in the SNS small Test Stand. The efficiency of positive ion generation in plasma has been improved up to ~90 mA/cm² per 1 kW of RF power at 13.56 MHz. For first cesiation was used a heating of the cesium chromate cartridges by CW RF discharge. A small oven for cesium compounds and alloys decomposition by heating was developed and tested. After cesiation a current of negative ions to the collector was increased from 0.5 mA to 10 mA with RF power ~ 1.5 kW in the plasma and longitudinal magnetic field Bl~250 Gauss. With increase of a longitudinal magnetic field the collector current can be increased up to 7 times. A stable long time generation of H⁻ beam without degradation was demonstrated in RF discharge with AlN discharge chamber.

Paper

Title

Page

Improving Efficiency of Ions Production in Ion Source with Saddle Antenna

682

V.G. Dudnikov, R.P. Johnson
Muons, Inc, Illinois, USA
T.R. Pennisi, C. Piller, M. Santana, M.P. Stockli, R.F. Welton
ORNL, Oak Ridge, Tennessee, USA
M.W. Turvey
University of Florida, Gainesville, Florida, USA

Funding: Work supported in part by US DOE Contract DE-AC05-00OR22725 and by STTR grant DE-SC0002690.
Extraction of negative ions from RF surface plasma source (SPS) with saddle antenna radio frequency (SA RF) discharge is considered. Several versions of new plasma generators with different antennas and magnetic field configurations were tested in the SNS small Test Stand. The efficiency of positive ion generation in plasma has been improved up to ~90 mA/cm² per 1 kW of RF power at 13.56 MHz. For first cesiation was used a heating of the cesium chromate cartridges by CW RF discharge. A small oven for cesium compounds and alloys decomposition by heating was developed and tested. After cesiation a current of negative ions to the collector was increased from 0.5 mA to 10 mA with RF power ~ 1.5 kW in the plasma and longitudinal magnetic field Bl~250 Gauss. With increase of a longitudinal magnetic field the collector current can be increased up to 7 times. A stable long time generation of H⁻ beam without degradation was demonstrated in RF discharge with AlN discharge chamber.