Impedance Measurement of an Antenna with Hydrogen Plasma Driven by 13.56 MHz-rf for J-PARC H{sup -} ion source

Journal Article · Mon Sep 26 00:00:00 EDT 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3637399· OSTI ID:21611673

Ueno, A; Namekawa, Y; Ohkoshi, K; Ikegami, K; Oguri, H ^[1]

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1. J-PARC Center, Tokai-mura, Naka-gun, Ibaraki-ken 319-1195 (Japan)

In order to satisfy the Japan Proton Accelerator Research Complex (J-PARC) second stage requirements of an H{sup -} ion beam current of 50 mA and a life-time of 2000 hours, the development of a 13.56 MHz-rf-driven H{sup -} ion source was started by using an antenna developed at the Spallation Neutron Source (SNS). As the first step, the impedance of an antenna with hydrogen plasma, which is one of the most important parameters, was measured. For an rf-power of 0 kW, 1.25 kW or 7.45 kW, it was measured as j84.19+5.107 {Omega}, j80.22+11.82 {Omega} or j58.24+21.16 {Omega}, respectively. Its real-part had a rather large value and rather large rf-power dependence unexpectedly. By using the measured impedance, the circuit to produce rf-plasma in the plasma chamber on a -50 kV potential with a 13.56 MHz-rf-source on the ground potential was designed by the circuit simulation code LTSpice IV.

• OSTI ID: 21611673
• Journal Information: AIP Conference Proceedings, Vol. 1390, Issue 1; Conference: 2. international symposium on negative ions, beams and sources, Takayama City (Japan), 16-19 Nov 2010; Other Information: DOI: 10.1063/1.3637399; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ANTENNAS
COMPUTERIZED SIMULATION
ELECTRIC POTENTIAL
HYDROGEN
HYDROGEN IONS 1 MINUS
IMPEDANCE
ION BEAMS
ION SOURCES
J-PARC
L CODES
MHZ RANGE
NEUTRON SOURCES
PLASMA
PLASMA PRODUCTION
RF SYSTEMS
SPALLATION
ACCELERATORS
ANIONS
BEAMS
CHARGED PARTICLES
COMPUTER CODES
CYCLIC ACCELERATORS
ELECTRICAL EQUIPMENT
ELEMENTS
EQUIPMENT
FREQUENCY RANGE
HYDROGEN IONS
IONS
NONMETALS
NUCLEAR REACTIONS
PARTICLE SOURCES
RADIATION SOURCES
SIMULATION
SYNCHROTRONS