T. R. Pennisi

Recent advancements with the H− injector performance for the Spallation Neutron Source operation and upgrade

Baoxi Han, R. F. Welton, Chris Stinson, Vic Andzulis et autres

Abstract The Spallation Neutron Source (SNS) located at the Oak Ridge National Laboratory is an accelerator-based, pulsed neutron facility utilized for a broad range of scientific research and industrial applications. In the past 5 years, the facility has reliably been operated at …

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Recent H- ion source research and development at the Oak Ridge National Laboratory*

R. F. Welton, Baoxi Han, M. P. Stöckli, S. N. Murray et autres

Abstract The U.S. Spallation Neutron Source (SNS) is a state-of-the-art neutron scattering facility delivering the world's most intense pulsed neutron beams to a wide array of instruments which are used to conduct investigations in many fields of science and engineering. Neutrons are …

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H- ion source operational performance and latest development at the Spallation Neutron Source

Baoxi Han, M. P. Stöckli, R. F. Welton, C. Piller et autres

Abstract The U.S. Spallation Neutron Source (SNS) at Oak Ridge National Laboratory is the world’s most powerful accelerator-driven pulsed neutron source. An H- injector feeds the accelerator with high current (>50 mA), time structured (1ms, 60 Hz) H- beam. The injector consists …

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Recent performance of the SNS H− ion source with a record long run

Baoxi Han, M. P. Stöckli, R. F. Welton, S N Murray et autres

The Spallation Neutron Source (SNS) accelerator system includes a 65 keV H- injector, a 2.5 MeV radio frequency quadrupole (RFQ), a 1 GeV linac chain (DTL-CCL-SCL) and an accumulator ring. The H− injector consists of an RF-driven, Cs-enhanced, multi-cusp H− ion source …

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H− ion source research and development at the Oak Ridge National Laboratory

R. F. Welton, M. P. Stöckli, Baoxi Han, S. N. Murray et autres

The U.S. Spallation Neutron Source (SNS) is a state-of-the-art neutron scattering facility delivering the world's most intense pulsed neutron beams to a wide array of instruments which are used to conduct investigations in many fields of science and engineering. Neutrons are produced …

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A comparison of SNS internal and external antenna source performance with and without cesium

Tiago Sarmento, M. P. Stöckli, R. F. Welton, Baoxi Han et autres

Experiments comparing an internal and an external antenna H− source at the Spallation Neutron Source with and without cesium revealed key performance differences which provide insight to the source physics and will guide the development of an RF H− source at the …

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Upgrading the LANSCE accelerator with a SNS RF-driven H− ion source

M. P. Stöckli, Baoxi Han, Mike Clemmer, Sarah Cousineau et autres

The LANSCE accelerator is currently powered by a filament-driven, biased converter-type H− ion source that operates at 10%, the highest plasma duty factor for this type of source, using only ∼2.2 SCCM of H2. The ion source needs to be replaced every …

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Installation and commissioning of the ion source systems for the new spallation neutron source 2.5 MeV injector

R. F. Welton, Baoxi Han, M. P. Stöckli, S. N. Murray et autres

The U.S. Spallation Neutron Source (SNS) is a state-of-the-art neutron scattering facility delivering the world’s most intense pulsed neutron beams to a wide array of instruments, which are used to conduct investigations in many fields of engineering, physics, chemistry, material science, and …

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RF-plasma H- ion sources as driver for high power accelerators

Baoxi Han, M. P. Stöckli, R. F. Welton, S. N. Murray et autres

Simulations of Beam Chopping for Potential Upgrades of the SNS LEBT Chopper

Baoxi Han, S. N. Murray, T. R. Pennisi, Vladimir Peplov et autres

The LEBT chopper is a critical element of the SNS accelerator system. In this work, the benefit of increasing the chopping voltage amplitude for the present chopping pattern is shown with beam simulations, and an ongoing hardware upgrade of the chopper pulser …

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Tests of Cs-Free Operation of the SNS RF H⁻ Ion Sources

Baoxi Han, Sarah Cousineau, S. N. Murray, T. R. Pennisi et autres

Tests were performed at SNS in collaboration with visiting colleagues from ISIS, UK to evaluate the uncesiated beam performance of the SNS RF H⁻ ion sources. Two spare experimental sources, one with internal antenna and one with external antenna were used for …

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RF Positive Ion Source with Solenoidal Magnetic Field

Vadim Dudnikov, R. P. Johnson, Baoxi Han, Yifan Kang et autres

A positive ion source with RF discharge in solenoidal magnetic field is described. In this paper we present an overview of positive ion production in saddle antenna (helicon discharge) radio frequency (SA RF) ion sources. The efficiency of H+ ion production in …