Initial tests of the Spallation Neutron Source H{sup -} ion source with an external antenna

Journal Article · Wed Mar 15 04:00:00 EST 2006 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.2163322· OSTI ID:20778994

Welton, R F; Stockli, M P; Murray, S N; Kang, Y; Peters, J ^[1]; DESY, Hamburg ^[2]

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1. Accelerator Systems Division, Spallation Neutron Source, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830-6473 (United States)
2. Germany

The ion source for the Spallation Neutron Source (SNS) is a radio-frequency (rf) multicusp source designed to deliver H{sup -} beam pulses of 40 mA to the SNS accelerator with a normalized root-mean-square emittance of less than 0.2{pi} mm mrad, with a pulse length of 1 ms and a repetition rate of 60 Hz. In order to achieve this performance the source must operate with both high-pulse rf power, {approx}50 kW, and high average rf power, {approx}3.5 kW, over a continuous operational period of 3 weeks. During operation at these power levels the plasma-immersed, porcelain-coated rf antenna is susceptible to damage, limiting source lifetime. We are therefore developing an ion source where the plasma is separated from the Cu antenna by an Al{sub 2}O{sub 3} discharge chamber. This article describes the ion source, presents initial beam extraction measurements, and details our ongoing effort to develop this concept into a suitable ion source for the SNS.

• OSTI ID: 20778994
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 3 Vol. 77; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
ALUMINIUM OXIDES
ANTENNAS
BEAM EXTRACTION
BEAM PULSERS
HYDROGEN IONS 1 MINUS
ION SOURCES
MICROWAVE RADIATION
NEUTRON SOURCES
OPERATION
PERFORMANCE
PLASMA
PORCELAIN
PULSES
RADIOWAVE RADIATION
SPALLATION