rf improvements for Spallation Neutron Source H{sup -} ion source

Journal Article · Mon Feb 15 04:00:00 EST 2010 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.3277187· OSTI ID:22053843

Kang, Y W; Fuja, R; Hardek, T; Lee, S -W; McCarthy, M P; Piller, M C; Shin, K; Stockli, M P; Welton, R F ^[1]; Goulding, R H ^[2]

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1. Spallation Neutron Source, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
2. Fusion Energy Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)

The Spallation Neutron Source at Oak Ridge National Laboratory is ramping up the accelerated proton beam power to 1.4 MW and just reached 1 MW. The rf-driven multicusp ion source that originates from the Lawrence Berkeley National Laboratory has been delivering {approx}38 mA H{sup -} beam in the linac at 60 Hz, 0.9 ms. To improve availability, a rf-driven external antenna multicusp ion source with a water-cooled ceramic aluminum nitride (AlN) plasma chamber is developed. Computer modeling and simulations have been made to analyze and optimize the rf performance of the new ion source. Operational statistics and test runs with up to 56 mA medium energy beam transport beam current identify the 2 MHz rf system as a limiting factor in the system availability and beam production. Plasma ignition system is under development by using a separate 13 MHz system. To improve the availability of the rf power system with easier maintenance, we tested a 70 kV isolation transformer for the 80 kW, 6% duty cycle 2 MHz amplifier to power the ion source from a grounded solid-state amplifier.

• OSTI ID: 22053843
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 2 Vol. 81; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALUMINIUM NITRIDES
AMPLIFIERS
ANTENNAS
AVAILABILITY
BEAM CURRENTS
BEAM PRODUCTION
BEAM TRANSPORT
HYDROGEN IONS 1 MINUS
ION SOURCES
LINEAR ACCELERATORS
MHZ RANGE
NEUTRON SOURCES
ORNL
PLASMA
PLASMA PRODUCTION
PROTON BEAMS
RF SYSTEMS
SPALLATION
TRANSFORMERS