Parasitic signals in the receiving band of the Sub-Harmonic Arc Detection system on JET ICRF Antennas

When testing the SHAD system on JET ICRF antennas, parasitic signals in the detection band (5-20MHz) were detected. We have identified emission from grid breakdown events in the Neutral Beam injectors, and Ion Cyclotron Emission from the plasma. Spurious signals in the band 4-10 MHz are also often o...

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Bibliographic Details
Main Authors: Jacquet, P., Blackman, T., Day, I. E., Graham, M., Mayoral, M.-L., Monakhov, I., Nightingale, M., Sharapov, S. E., Berger-By, G., Bobkov, V., Durodie, F., Vrancken, M., Hellsten, T., Laxaaback, M., EFDA-CSU, Culham Science Centre, Abingdon, 0X14 3DB
Format: Conference Proceeding
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ANTENNAS
CHARGED PARTICLES
CLOSED PLASMA DEVICES
CURRENT-DRIVE HEATING
CYCLOTRON RESONANCE
EDGE LOCALIZED MODES
ELECTRIC HEATING
ELECTRICAL EQUIPMENT
ELECTROMAGNETIC FIELDS
FOURIER ANALYSIS
FREQUENCY RANGE
HEATING
HIGH-FREQUENCY HEATING
ICR HEATING
INSTABILITY
ION CYCLOTRON-RESONANCE
IONS
JET TOKAMAK
JOULE HEATING
MHZ RANGE
OPERATION
PLASMA
PLASMA HEATING
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
RESONANCE
SIGNALS
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
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Description
Summary:When testing the SHAD system on JET ICRF antennas, parasitic signals in the detection band (5-20MHz) were detected. We have identified emission from grid breakdown events in the Neutral Beam injectors, and Ion Cyclotron Emission from the plasma. Spurious signals in the band 4-10 MHz are also often observed at the onset of ELM events. Such parasitic signals could complicate the design and operation of SHAD in ICRF systems for fusion devices.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.3664919