Diagnostics for real-time plasma control in PBX-M

Journal Article · Sun Jan 01 00:00:00 EST 1995 · Review of Scientific Instruments; (United States)

DOI:https://doi.org/10.1063/1.1146543· OSTI ID:6711054

Kaita, R; Batha, S; Bell, R E; Bernabei, S; Hatcher, R; Kozub, T; Kugel, H; Levinton, F; Okabayashi, M; Sesnic, S; von Goeler, S; Zolfaghari, A ^[1]

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1. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)

An important issue for future tokamaks is real-time plasma control for the avoidance of magnetohydrodynamic instabilities and other applications that require detailed plasma profile and fluctuation data. Although measurements from diagnostics providing this information require significantly more processing than magnetic flux data, recent advancements could make them practical for adjusting operational settings for plasma heating and current drive systems as well as field coil currents. On the Princeton Beta Experiment-Modification (PBX-M), the lower hybrid current drive phasing can be varied during a plasma shot using digitally programmable ferrite phase shifters, and neural beam functions can be fully computer controlled. PBX-M diagnostics that may be used for control purposes include motional Stark-effect polarimetry for magnetic field pitch angle profiles, soft x-ray arrays for plasma position control and the separation of [beta][sub [ital p]] from [ital l][sub [ital i]], hard x-ray detectors for energetic electron distributions, a multichannel electron cyclotron emission radiometer for ballooning mode identification, and passive plate eddy current monitors for kink stabilization. We will describe the present status of these systems on PBX-M, and discuss their suitability for feedback applications.

• DOE Contract Number: AC02-76CH03073
• OSTI ID: 6711054
• Journal Information: Review of Scientific Instruments; (United States), Vol. 66:1; ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
PBX DEVICES
PLASMA DIAGNOSTICS
BALLOONING INSTABILITY
COMPUTERIZED CONTROL SYSTEMS
FEEDBACK
KINK INSTABILITY
POLARIMETRY
RADIOMETERS
STARK EFFECT
X-RAY DETECTION
CLOSED PLASMA DEVICES
CONTROL SYSTEMS
DETECTION
INSTABILITY
MEASURING INSTRUMENTS
ON-LINE CONTROL SYSTEMS
ON-LINE SYSTEMS
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
RADIATION DETECTION
RADIATION DETECTORS
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
700320* - Plasma Diagnostic Techniques & Instrumentation- (1992-)