TFTR neutral beam injected power measurement

Journal Article · Wed Nov 01 04:00:00 EST 1989 · Review of Scientific Instruments; (USA)

DOI:https://doi.org/10.1063/1.1140533· OSTI ID:5349197

Kamperschroer, J H; Grisham, L R; Dudek, L E; Gammel, G M; Johnson, G A; Kugel, H W; Lagin, L; O'Connor, T E; Shah, P A; Sichta, P ^[1]; others, and

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1. Princeton Plasma Physics Laboratory, Princeton University, Princeton, NJ (USA)

Energy flow within TFTR neutral beamlines is measured with a waterflow calorimetry system capable of simultaneously measuring the energy deposited within four heating beamlines (three ion sources each), or of measuring the energy deposited in a separate neutral beam test stand. Of the energy extracted from the ion source on the well-instrumented test stand, 99.5{plus minus}3.5% can be accounted for. When the ion deflection magnet is energized, however, 6.5% of the extracted energy is lost. This loss is attributed to a spray of devious particles onto unmonitored surfaces. A 30% discrepancy is also observed between energy measurements on the internal beamline calorimeter and energy measurements on a calorimeter located in the test stand target chamber. Particle reflection from the flat plate calorimeter in the target chamber, which the incident beam strikes at a near-grazing angle of 12{degree}, is the primary loss of this energy. A slight improvement in energy accountability is observed as the beam pulse length is increased. This improvement is attributed to systematic error in the sensitivity of the energy measurement to small fluctuations in the supply water temperature. An overall accuracy of 15% is estimated for the total power injected into TFTR. Contributions to this error are uncertainties in the beam neutralization efficiency, reionization and beam scrape-off in the drift duct, and fluctuations in the temperature of the supply water.

• OSTI ID: 5349197
• Journal Information: Review of Scientific Instruments; (USA), Journal Name: Review of Scientific Instruments; (USA) Vol. 60:11; ISSN RSINA; ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101 -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
ABSORPTION
BEAM BENDING MAGNETS
BEAM INJECTION
CALORIMETRY
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
ENERGY ABSORPTION
ENERGY LOSSES
EQUIPMENT
FLUID FLOW
HYDROGEN COMPOUNDS
LOSSES
MAGNETS
NEUTRAL ATOM BEAM INJECTION
OXYGEN COMPOUNDS
PLASMA
PLASMA DIAGNOSTICS
POWER
TFTR TOKAMAK
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS
WATER