IPAC2011 - List of Authors (Dudnikov, V.G.)

Paper	Title	Page
TUPS105	Beam Brightness Booster with Self-Stabilization of Electron-Proton Instability	1789
	V.G. Dudnikov, C.M. Ankenbrandt Muons, Inc, Batavia, USA
	The brightness and intensity of a circulating proton beam now can be increased up to the space charge tune shift limit by means of charge exchange injection or by electron cooling but cannot be increased above this limit. Significantly higher brightness can be produced by means of charge exchange injection with space charge compensation. The brightness of the space charge compensated beam is limited at low level by an electron-proton (e-p) instability. Fortunately, the e-p instability can be self-stabilized at a high beam density. The “cesiation effect” significantly increases negative ion emission from gas discharges, and surface-plasma sources for intense high brightness negative ion beam production have been developed. These developments make it possible to produce stable “superintense” circulating beams with intensity and brightness far above the space charge limit. A beam brightness booster (BBB) for significant increases of accumulated beam brightness is discussed. Superintense beam production can be simplified by developing a nonlinear nearly-integrable focusing system with broad betatron tune spread and a broadband feedback system for e-p instability suppression. M. Reiser, “Theory and Design of Charged Particle Beam”, second edition, p. 565-570, Wiley-VCH, (2006).

THPS026	Surface Plasma H⁻ Ion Source with Saddle RF Antenna Plasma Generator	3475
	V.G. Dudnikov, R.P. Johnson Muons, Inc, Batavia, USA S.N. Murray, T.R. Pennisi, M. Santana, M.P. Stockli, R.F. Welton ORNL, Oak Ridge, Tennessee, USA
	Funding: *Work supported in part by US DOE Contract DE-AC05-00OR22725 and by STTR grant DE-SC0002690. In this project is developed a prototype RF H⁻ surface plasma source (SPS) with saddle (SA) RF antenna which will provide better power efficiency for high pulsed and average current, higher brightness with longer lifetime and higher reliability. Several versions of new plasma generators with a small AlN test chamber and different antennas and magnetic field configurations were tested in the SNS ion source Test Stand. A prototype SA SPS was installed in the Test Stand with a larger, normal-sized SNS AlN chamber that achieved unanalyzed peak currents of up to 67 mA with an apparent efficiency of 1.6 mA/kW. Control experiments with H⁻ beam produced by SNS SPS with internal and external antennas were conducted. A new version of the RF triggering plasma source (TPS) has been designed. A Saddle antenna SPS with water cooling is being fabricated for high duty factor testing.

THPS027	Cesiation in Highly Efficient Surface Plasma Sources	3478
	V.G. Dudnikov, R.P. Johnson Muons, Inc, Batavia, USA
	Funding: Work supported in part by STTR grant DE-SC0002690. Features of cesiation* in different modifications of H-/D- source designs have been considered. New sources under development include advanced versions of Compact Surface Plasma Sources (CSPS) which will efficiently generate brighter beam in noiseless discharge, deliver significantly increased (up to 20 mA) average current with better electrode cooling using new materials, have significantly extended lifetime and reduced cesium consumption. Related ion sources that use cesium are described and an improved cesiation procedure for reproducible production of high efficiency H⁻ ion generation is considered. * V. Dudnikov, SU Author Certificate, C1.H01 3/04, No. 411542, 10 March, 1972.

Paper

Title

Page

Beam Brightness Booster with Self-Stabilization of Electron-Proton Instability

1789

V.G. Dudnikov, C.M. Ankenbrandt
Muons, Inc, Batavia, USA

The brightness and intensity of a circulating proton beam now can be increased up to the space charge tune shift limit by means of charge exchange injection or by electron cooling but cannot be increased above this limit. Significantly higher brightness can be produced by means of charge exchange injection with space charge compensation*. The brightness of the space charge compensated beam is limited at low level by an electron-proton (e-p) instability. Fortunately, the e-p instability can be self-stabilized at a high beam density. The “cesiation effect” significantly increases negative ion emission from gas discharges, and surface-plasma sources for intense high brightness negative ion beam production have been developed. These developments make it possible to produce stable “superintense” circulating beams with intensity and brightness far above the space charge limit. A beam brightness booster (BBB) for significant increases of accumulated beam brightness is discussed. Superintense beam production can be simplified by developing a nonlinear nearly-integrable focusing system with broad betatron tune spread and a broadband feedback system for e-p instability suppression.
* M. Reiser, “Theory and Design of Charged Particle Beam”, second edition, p. 565-570, Wiley-VCH, (2006).

THPS026

Surface Plasma H⁻ Ion Source with Saddle RF Antenna Plasma Generator

3475

V.G. Dudnikov, R.P. Johnson
Muons, Inc, Batavia, USA
S.N. Murray, T.R. Pennisi, M. Santana, M.P. Stockli, R.F. Welton
ORNL, Oak Ridge, Tennessee, USA

Funding: *Work supported in part by US DOE Contract DE-AC05-00OR22725 and by STTR grant DE-SC0002690.
In this project is developed a prototype RF H⁻ surface plasma source (SPS) with saddle (SA) RF antenna which will provide better power efficiency for high pulsed and average current, higher brightness with longer lifetime and higher reliability. Several versions of new plasma generators with a small AlN test chamber and different antennas and magnetic field configurations were tested in the SNS ion source Test Stand. A prototype SA SPS was installed in the Test Stand with a larger, normal-sized SNS AlN chamber that achieved unanalyzed peak currents of up to 67 mA with an apparent efficiency of 1.6 mA/kW. Control experiments with H⁻ beam produced by SNS SPS with internal and external antennas were conducted. A new version of the RF triggering plasma source (TPS) has been designed. A Saddle antenna SPS with water cooling is being fabricated for high duty factor testing.

THPS027

Cesiation in Highly Efficient Surface Plasma Sources

3478

V.G. Dudnikov, R.P. Johnson
Muons, Inc, Batavia, USA

Funding: Work supported in part by STTR grant DE-SC0002690.
Features of cesiation* in different modifications of H-/D- source designs have been considered. New sources under development include advanced versions of Compact Surface Plasma Sources (CSPS) which will efficiently generate brighter beam in noiseless discharge, deliver significantly increased (up to 20 mA) average current with better electrode cooling using new materials, have significantly extended lifetime and reduced cesium consumption. Related ion sources that use cesium are described and an improved cesiation procedure for reproducible production of high efficiency H⁻ ion generation is considered.
* V. Dudnikov, SU Author Certificate, C1.H01 3/04, No. 411542, 10 March, 1972.