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 04:00:00 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]

---

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, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1390; ISSN 0094-243X; ISSN APCPCS
• Country of Publication: United States
• Language: English

Related Subjects

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